{"id":11688,"date":"2025-12-23T14:12:35","date_gmt":"2025-12-23T06:12:35","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11688"},"modified":"2026-05-15T12:43:33","modified_gmt":"2026-05-15T04:43:33","slug":"m2-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/pt\/m2-tool-steel-heat-treatment\/","title":{"rendered":"M2 Steel Heat Treatment: Hardening, Tempering & 60\u201365 HRC Chart"},"content":{"rendered":"
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Guia de Tratamento T\u00e9rmico de A\u00e7o para Ferramentas M2<\/h1>\n\n\n\n

M2 tool steel is typically heat-treated by double preheating, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or a salt bath, and double- or triple-tempering at about 538\u2013595\u00b0C. A common process uses a first preheat at 540\u2013650\u00b0C, a second preheat at 845\u2013870\u00b0C, short austenitizing for about 2\u20135 minutes after temperature equalization, quenching to about 66\u201393\u00b0C, and immediate tempering. After proper hardening and tempering, M2 usually reaches about 60\u201365 HRC.<\/p>\n\n\n\n

M2 is a molybdenum-tungsten high-speed tool steel used where high hardness, wear resistance, and red hardness are required. Its heat treatment window is narrow. Long soaking, overheating, inadequate atmosphere protection, delayed or insufficient tempering, can cause low hardness, grain coarsening, retained austenite, cracking, decarburization, or dimensional instability.<\/p>\n\n\n\n

Aobo Steel supplies M2 \/ DIN 1.3343 \/ JIS SKH51 high-speed tool steel in an annealed condition for bulk orders. For chemical composition, equivalent grades, available sizes, tolerance, inspection requirements, and export supply details, please visit our M2 Tool Steel product page<\/a> or contact us at sales@aobosteel.com<\/a>.<\/p>\n\n\n\n

M2 Tool Steel Heat Treatment Temperature Chart<\/h2>\n\n\n\n

The following chart presents the main heat-treatment data for M2 tool steel. The detailed process sequence is explained in the step-by-step section below.<\/p>\n\n\n\n

Etapa do processo<\/strong><\/td>Temperature \/ Condition<\/strong><\/td>Controle de teclas<\/strong><\/td><\/tr>
Recozimento<\/td>870\u2013900\u00b0C \/ 1600\u20131650\u00b0F<\/td>Hold about 1 hour per inch of thickness. Furnace cool slowly to 650\u00b0C, then air cool. Typical maximum annealed hardness is about 241 HB.<\/td><\/tr>
Al\u00edvio do estresse<\/td>650\u2013675\u00b0C \/ 1200\u20131245\u00b0F<\/td>Used after heavy machining. Hold 1\u20132 hours per inch of cross-section, then cool slowly.<\/td><\/tr>
First preheating<\/td>540\u2013650\u00b0C \/ 1000\u20131200\u00b0F<\/td>Reduces initial thermal shock.<\/td><\/tr>
Second preheating<\/td>845\u2013870\u00b0C \/ 1555\u20131600\u00b0F<\/td>Equalizes the tool before austenitizing.<\/td><\/tr>
Austenitiza\u00e7\u00e3o<\/td>1190\u20131230\u00b0C \/ 2175\u20132245\u00b0F<\/td>Lower range for toughness; higher range for hardness, wear resistance, and red hardness.<\/td><\/tr>
Soaking time<\/td>Usually 2\u20135 minutes after equalization<\/td>Avoid long soaking.<\/td><\/tr>
Resfriamento<\/td>Oil, air, or salt bath<\/td>Quench to about 66\u201393\u00b0C \/ 150\u2013200\u00b0F.<\/td><\/tr>
As-quenched hardness<\/td>About 64\u201366 HRC<\/td>Temper immediately. Do not leave M2 in the as-quenched condition.<\/td><\/tr>
Optional sub-zero treatment<\/td>-100 to -195\u00b0C \/ -150 to -320\u00b0F<\/td>Used when dimensional stability is critical.<\/td><\/tr>
T\u00eampera<\/td>538\u2013595\u00b0C \/ 1000\u20131105\u00b0F<\/td>Double tempering is required. Triple tempering is often used for demanding tools.<\/td><\/tr>
Typical final hardness<\/td>About 60\u201365 HRC<\/td>Depends on austenitizing temperature, quenching method, tempering temperature, and section size.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

M2 should be heated in a vacuum furnace, in a controlled neutral atmosphere, or in a neutral salt bath whenever possible. At M2 hardening temperatures, surface decarburization can leave a soft outer layer, reducing wear resistance.<\/p>\n\n\n\n

How to Heat Treat M2 Tool Steel Step by Step<\/h2>\n\n\n\n

M2 heat treatment should be controlled as a full process, not as separate heating and cooling operations. Each stage affects the next one. Poor preheating increases cracking risk. Incorrect austenitizing alters carbide solubility and the amount of retained austenite. Improper quenching affects hardness and distortion. Insufficient tempering leaves the structure unstable.<\/p>\n\n\n\n

Step 1: Stress Relieving Before Hardening<\/h3>\n\n\n\n

Stress relieving is recommended when the M2 tool has been heavily machined before hardening. If a large amount of material has been removed, internal machining stress can cause movement or cracking during final heat treatment.<\/p>\n\n\n\n

For stress relieving, heat the tool slowly to 650\u2013675\u00b0C (1200\u20131245\u00b0F) and hold for about 1\u20132 hours per inch of cross-section. After holding, cool slowly to room temperature. This step does not harden the steel. Its purpose is to reduce internal stress before the high-temperature hardening cycle.<\/p>\n\n\n\n

In production, rough machining should be completed before stress relieving, with sufficient allowance left for final grinding after hardening and tempering.<\/p>\n\n\n\n

Step 2: Double Preheating for M2 Tool Steel<\/h3>\n\n\n\n

M2 should not be placed directly into the austenitizing temperature range. Because of its high alloy content and high hardening temperature, direct high-temperature heating can cause significant thermal shock and increase the risk of cracking.<\/p>\n\n\n\n

Preheating Stage<\/strong><\/td>Faixa de temperatura<\/strong><\/td>Finalidade<\/strong><\/td><\/tr>
First preheat<\/td>540\u2013650\u00b0C \/ 1000\u20131200\u00b0F<\/td>Reduces the first temperature shock and begins uniform heating.<\/td><\/tr>
Second preheat<\/td>845\u2013870\u00b0C \/ 1555\u20131600\u00b0F<\/td>Equalizes the tool before rapid heating to the austenitizing range.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The purpose of preheating is temperature equalization, not long soaking. Once the tool is uniformly heated, it should move into the austenitizing stage without unnecessary delay. Excessive holding during heating is unnecessary and may increase the risk of decarburization if the atmosphere is poorly protected.<\/p>\n\n\n\n

Some references also list a general M2 preheating range of 730\u2013845\u00b0C, or an elevated two-stage cycle at 843\u00b0C and 1010\u00b0C. For a clear technical guide, the 540\u2013650\u00b0C plus 845\u2013870\u00b0C sequence is easier for readers to follow and directly explains the staged heating process before hardening.<\/p>\n\n\n\n

Step 3: Austenitizing Temperature and Soaking Time<\/h3>\n\n\n\n

M2 is normally austenitized at 1190\u20131230\u00b0C (2175\u20132245\u00b0F). This is the most sensitive part of the heat treatment cycle. The temperature must be high enough to dissolve sufficient alloy carbides, but not so high or so long that it causes grain coarsening, excess retained austenite, or overheating damage.<\/p>\n\n\n\n

Austenitizing Target<\/strong><\/td>Faixa de temperatura<\/strong><\/td>Application Logic<\/strong><\/td><\/tr>
Toughness priority<\/td>1175\u20131190\u00b0C \/ 2150\u20132175\u00b0F<\/td>Used when toughness and cracking resistance are more important than maximum hardness.<\/td><\/tr>
Standard M2 hardening range<\/td>1190\u20131230\u00b0C \/ 2175\u20132245\u00b0F<\/td>General range for M2 cutting tools and wear-resistant tooling.<\/td><\/tr>
Maximum hardness and wear resistance<\/td>Around 1230\u00b0C \/ 2245\u00b0F<\/td>Used when high hardness, wear resistance, and red hardness are required.<\/td><\/tr>
Salt bath adjustment<\/td>About 14\u00b0C \/ 25\u00b0F lower<\/td>Used when hardening from a salt bath.<\/td><\/tr>
High-carbon M2 adjustment<\/td>About 14\u00b0C \/ 25\u00b0F lower<\/td>Helps reduce overheating and retained austenite risk.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

The soaking time at the austenitizing temperature should be short. After the tool reaches temperature, M2 is usually held for only about 2\u20135 minutes. Very large sections may require about 5\u20136 minutes, but M2 should not be soaked like low-alloy steels.<\/p>\n\n\n\n

Over-soaking is one of the most common causes of M2 heat treatment failure. Excessive time at high temperature dissolves too much carbon and alloy into austenite, increases retained austenite, coarsens the grain structure, and reduces toughness. Underheating causes the opposite problem: insufficient carbide solution, lower hardness, and weaker secondary hardening during tempering.<\/p>\n\n\n\n

For M2, the goal is not maximum furnace time. The goal is a controlled carbide solution within a narrow temperature-time window.<\/p>\n\n\n\n

Step 4: Quenching Methods: Oil, Air, and Salt Bath<\/h3>\n\n\n\n

After austenitizing, M2 can be quenched in oil, air, or a hot salt bath. The best method depends on the tool size, the hardness target, the distortion tolerance, and the available heat-treatment equipment.<\/p>\n\n\n\n

M\u00e9todo de resfriamento<\/strong><\/td>Best Use<\/strong><\/td>Main Limitation<\/strong><\/td><\/tr>
Oil quenching<\/td>Higher hardness response<\/td>Higher distortion and cracking risk than air cooling.<\/td><\/tr>
t\u00eampera por ar<\/td>Better dimensional stability<\/td>Hardness may be lower in larger or slower-cooling sections.<\/td><\/tr>
Hot salt bath quenching<\/td>Good temperature equalization and reduced thermal shock<\/td>Requires suitable salt bath equipment and strict control.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Oil quenching is often selected when maximum hardness response is required. The tool is cooled from the austenitizing temperature to about 66\u201393\u00b0C (150\u2013200\u00b0F).<\/p>\n\n\n\n

Air quenching is milder and can reduce the risk of distortion. It is more suitable for smaller sections or tools where dimensional stability is more important than the most aggressive cooling response.<\/p>\n\n\n\n

Hot salt bath quenching provides better control of temperature equalization. The tool is held in the salt bath long enough for the section to equalize, then cooled further before tempering. This method can reduce thermal shock and distortion when properly controlled.<\/p>\n\n\n\n

The most important rule is the same for all three methods: temper immediately after the tool cools to about 66\u201393\u00b0C. M2 should not be left fully cold in the as-quenched condition for an extended period. At this stage, the structure contains highly stressed martensite and retained austenite, so delayed tempering increases the risk of cracking and dimensional instability.<\/p>\n\n\n\n

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Figure: Time-temperature-transformation diagram for annealed M2 high-speed tool steel before quenching. The chart compares salt quenching, air quenching, and air cooling after austenitizing at 1230\u00b0C \/ 2250\u00b0F, and shows the beginning of martensite formation during cooling. Source: ASM Handbook, Volume 16, Machining, page 121.<\/em><\/figcaption><\/figure>\n\n\n\n

Step 5: Optional Sub-Zero Treatment<\/h3>\n\n\n\n

Sub-zero treatment is optional. It is mainly used when dimensional stability is critical, especially for intricate tools, precision components, or parts in which retained austenite must be further reduced.<\/p>\n\n\n\n

A typical sub-zero range is -100 to -195\u00b0C (-150 to -320\u00b0F). After the part returns to room temperature, tempering should begin immediately. For intricate shapes, a brief, low-temperature stress-relief temper may be used before freezing to reduce the risk of cracking.<\/p>\n\n\n\n

Sub-zero treatment should not replace proper austenitizing, quenching, and multiple tempering. It is only an additional stabilizing step when the tool design and service conditions require it.<\/p>\n\n\n\n

Step 6: Double or Triple Tempering<\/h3>\n\n\n\n

Tempering must begin immediately after quenching, or immediately after the part returns to room temperature if a sub-zero cycle is used. M2 relies on secondary hardening, so tempering is not only for stress relief. It also controls the transformation of retained austenite, carbide precipitation, final hardness, and toughness.<\/p>\n\n\n\n

The common tempering range for M2 is 538\u2013595\u00b0C (1000\u20131105\u00b0F). Double tempering is the minimum practical requirement. Triple tempering is often used for cutting tools, precision tooling, and demanding service conditions.<\/p>\n\n\n\n

Each tempering cycle should be followed by cooling to room temperature before the next temper begins. This cooling stage is important because retained austenite can transform into fresh martensite during cooling. The next temper then relieves the stress in that newly formed martensite.<\/p>\n\n\n\n

A simple rule is: do not use single tempering for M2 when stable performance is required. One tempering cycle is usually not enough to stabilize the structure.<\/p>\n\n\n\n

M2 Tempering Temperature and Hardness Chart<\/h2>\n\n\n\n

M2 has a strong secondary hardening response. Its hardness does not simply decrease as tempering temperature rises. In the high-tempering range, fine alloy carbides precipitate, and hardness can rise again.<\/p>\n\n\n\n

The following chart shows typical hardness after double tempering when M2 is austenitized around 1230\u00b0C \/ 2250\u00b0F.<\/p>\n\n\n\n

Temperatura de t\u00eampera<\/strong><\/td>Oil Quenched Hardness<\/strong><\/td>Air Quenched Hardness<\/strong><\/td><\/tr>
Como extinto<\/td>64.0\u201366.0 HRC<\/td>64.0\u201366.0 HRC<\/td><\/tr>
400\u00b0F \/ 204\u00b0C<\/td>63.0 HRC<\/td>63.0 HRC<\/td><\/tr>
500\u00b0F \/ 260\u00b0C<\/td>62.5 HRC<\/td>62.5 HRC<\/td><\/tr>
600\u00b0F \/ 316\u00b0C<\/td>62.5 HRC<\/td>62.5 HRC<\/td><\/tr>
700\u00b0F \/ 371\u00b0C<\/td>62.5 HRC<\/td>62.5 HRC<\/td><\/tr>
800\u00b0F \/ 427\u00b0C<\/td>63.5 HRC<\/td>63.5 HRC<\/td><\/tr>
900\u00b0F \/ 482\u00b0C<\/td>64.0 HRC<\/td>64.0 HRC<\/td><\/tr>
1000\u00b0F \/ 540\u00b0C<\/td>64.5\u201365.5 HRC<\/td>62.0 HRC<\/td><\/tr>
1025\u00b0F \/ 550\u00b0C<\/td>65.0 HRC<\/td>63.0 HRC<\/td><\/tr>
1050\u00b0F \/ 565\u00b0C<\/td>63.5\u201365.5 HRC<\/td>64.0 HRC<\/td><\/tr>
1100\u00b0F \/ 595\u00b0C<\/td>61.5\u201364.0 HRC<\/td>63.0 HRC<\/td><\/tr>
1150\u00b0F \/ 620\u00b0C<\/td>60.0\u201362.0 HRC<\/td>60.0 HRC<\/td><\/tr>
1200\u00b0F \/ 650\u00b0C<\/td>53.0\u201353.5 HRC<\/td>53.0 HRC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

For many M2 cutting and tooling applications, tempering at around 540\u2013565\u00b0C is common because it falls near the secondary hardening range. This range helps balance hardness, cutting performance, toughness, and stability.<\/p>\n\n\n\n

M2 should not be undertempered. A low tempering temperature or insufficient tempering cycles can leave high internal stress and unstable retained austenite. Double tempering is the minimum practical requirement, and triple tempering is often used for more demanding tools.<\/p>\n\n\n\n

Effect of Austenitizing Temperature on M2 Tempered Hardness<\/h2>\n\n\n\n

The austenitizing temperature affects the final hardness response. Higher hardening temperatures dissolve more carbon and alloying elements, thereby strengthening secondary hardening during tempering. However, they also increase the risk of retained austenite and overheating.<\/p>\n\n\n\n

Temperatura de t\u00eampera<\/strong><\/td>Hardened at 1180\u00b0C<\/strong><\/td>Hardened at 1200\u00b0C<\/strong><\/td>Hardened at 1220\u00b0C<\/strong><\/td>Hardened at 1240\u00b0C<\/strong><\/td><\/tr>
Como extinto<\/td>66.0 HRC<\/td>64.0 HRC<\/td>65.0 HRC<\/td>64.0 HRC<\/td><\/tr>
200\u00b0C<\/td>63.0 HRC<\/td>61.5 HRC<\/td>62.5 HRC<\/td>61.5 HRC<\/td><\/tr>
300\u00b0C<\/td>62.7 HRC<\/td>61.5 HRC<\/td>62.5 HRC<\/td>61.5 HRC<\/td><\/tr>
400\u00b0C<\/td>63.0 HRC<\/td>62.0 HRC<\/td>62.5 HRC<\/td>62.0 HRC<\/td><\/tr>
500\u00b0C<\/td>63.5 HRC<\/td>64.0 HRC<\/td>64,5 HRC<\/td>64,5 HRC<\/td><\/tr>
525\u00b0C<\/td>64,5 HRC<\/td>65.0 HRC<\/td>65.5 HRC<\/td>66.0 HRC<\/td><\/tr>
550\u00b0C<\/td>64,5 HRC<\/td>65.5 HRC<\/td>66.0 HRC<\/td>66.5 HRC<\/td><\/tr>
575\u00b0C<\/td>64.0 HRC<\/td>63.5 HRC<\/td>64,5 HRC<\/td>66.0 HRC<\/td><\/tr>
600\u00b0C<\/td>62.0 HRC<\/td>62.5 HRC<\/td>62.5 HRC<\/td>63.0 HRC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

This table shows why M2 should not be heat-treated only to chase the highest hardness number. A higher hardening temperature can produce stronger secondary hardening, but the safe processing margin becomes narrower. In production, the better target is stable hardness with acceptable toughness, controlled retained austenite, and reliable tool life.<\/p>\n\n\n\n

M2 Heat Treatment Problems<\/h2>\n\n\n\n

Most M2 heat-treatment failures result from five areas: incorrect austenitizing, excessive soaking, poor atmosphere protection, improper quenching, and insufficient tempering.<\/p>\n\n\n\n

Problem<\/strong><\/td>Main Cause<\/strong><\/td>Resultado<\/strong><\/td><\/tr>
Low hardness<\/td>Underheating, insufficient carbide solution, poor quenching, or excess retained austenite<\/td>The tool cannot reach the required working hardness.<\/td><\/tr>
Grain coarsening<\/td>Overheating or over-soaking<\/td>Lower toughness and higher cracking risk.<\/td><\/tr>
Excess retained austenite<\/td>High austenitizing temperature, long soaking, or insufficient tempering<\/td>Dimensional change and unstable hardness.<\/td><\/tr>
Rachaduras por t\u00eampera<\/td>Thermal shock, severe quench stress, or delayed tempering<\/td>Cracking during or after hardening.<\/td><\/tr>
Descarboneta\u00e7\u00e3o<\/td>Heating without atmosphere protection<\/td>Soft surface and poor wear resistance.<\/td><\/tr>
Under-tempering<\/td>Low tempering temperature or too few tempering cycles<\/td>Brittleness and unstable structure.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Overheating and over-soaking are serious because M2 is processed close to its high-temperature limit. Excessive temperature or time can coarsen the grain, increase retained austenite, reduce toughness, and lower practical tool reliability.<\/p>\n\n\n\n

Underheating prevents enough alloy carbides from dissolving. The result is lower quenched hardness and weaker secondary hardening during tempering.<\/p>\n\n\n\n

Retained austenite is expected in M2, but excessive retained austenite causes problems. It can transform later during service, leading to the formation of fresh martensite, dimensional growth, internal stresses, and an increased risk of cracking.<\/p>\n\n\n\n

Decarburization is another major failure source. If M2 is heated without vacuum, neutral atmosphere, or salt bath protection, the surface can lose carbon and remain soft after hardening.<\/p>\n\n\n\n

Tempering errors are especially costly. M2 requires multiple tempering cycles because the transformation of retained austenite and the tempering of fresh martensite cannot be completed properly in a single cycle. For stable performance, the tool should cool to room temperature between tempers.<\/p>\n\n\n\n

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Note: Aobo Steel supplies M2 \/ DIN 1.3343 \/ JIS SKH51 high-speed tool steel in an annealed condition. We do not provide final heat treatment, hardening, or tempering services. This article is prepared as technical support for our customers and is intended to help buyers better understand the principles of M2 heat treatment before arranging their own processing.<\/p>\n\n\n\n

Actual heat treatment results may vary depending on furnace control, section size, tool design, quenching method, and the heat-treatment facility\u2019s process control. For M2 tool steel supply, available sizes, inspection requirements, MTC, and export order details, please contact sales@aobosteel.com<\/a>.<\/p>\n\n\n\n

Perguntas frequentes<\/h2>\n\n\n\n
What is the standard heat treatment process for M2 tool steel?<\/strong>

M2 tool steel is usually heat-treated by double preheating, austenitizing, quenching, and double- or triple-tempering. A common process uses first preheating at 540\u2013650\u00b0C, second preheating at 845\u2013870\u00b0C, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or salt bath, and tempering at about 538\u2013595\u00b0C.<\/p> <\/div>

What hardness can M2 tool steel reach after heat treatment?<\/strong>

After proper hardening and tempering, M2 tool steel typically reaches about 60\u201365 HRC. The final hardness depends on the austenitizing temperature, quenching method, tempering temperature, section size, and furnace control.<\/p> <\/div>

What is the austenitizing temperature for M2 tool steel?<\/strong>

The standard austenitizing temperature for M2 tool steel is usually 1190\u20131230\u00b0C. Lower temperatures are used when toughness is more important, while higher temperatures near 1230\u00b0C are used when maximum hardness, wear resistance, and red hardness are required.<\/p> <\/div>

How long should M2 tool steel be soaked at the austenitizing temperature?<\/strong>

M2 tool steel should be soaked for only a short time at the austenitizing temperature, usually about 2\u20135 minutes after the tool reaches temperature. Long soaking can cause grain coarsening, excessive retained austenite, reduced toughness, and unstable hardness.<\/p> <\/div>

Can M2 tool steel be air quenched?<\/strong>

Yes. M2 can be quenched in air, oil, or a hot salt bath. Air quenching is milder and can help reduce distortion, especially for smaller sections. Oil quenching may give a stronger hardness response, while salt bath quenching offers better temperature equalization and distortion control.<\/p> <\/div>

Why does M2 need double or triple tempering?<\/strong>

M2 contains a significant amount of retained austenite after quenching. During tempering and cooling between tempers, retained austenite can transform into fresh martensite. The second or third temper is needed to temper this fresh martensite, reduce internal stress, and stabilize final hardness and toughness.<\/p> <\/div>

What is the best tempering temperature for M2 tool steel?<\/strong>

For many M2 cutting and tooling applications, tempering at 540\u2013565\u00b0C is common because this range is near the secondary hardening peak. It helps balance hardness, cutting performance, toughness, and dimensional stability.<\/p> <\/div>

Why should M2 be tempered immediately after quenching?<\/strong>

M2 should be tempered immediately after cooling to about 66\u201393\u00b0C because the as-quenched structure is highly stressed and unstable. Delayed tempering can increase the risk of cracking, dimensional changes, and instability due to retained austenite.<\/p> <\/div>

What causes low hardness after M2 heat treatment?<\/strong>

Low hardness may result from underheating, insufficient carbide solution, incorrect quenching, excessive retained austenite, decarburization, or improper tempering. For M2, both temperature and soaking time must be carefully controlled because the heat-treatment window is narrow.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"

M2 Tool Steel Heat Treatment Guide M2 tool steel is typically heat-treated by double preheating, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or a salt bath, and double- or triple-tempering at about 538\u2013595\u00b0C. A common process uses a first preheat at 540\u2013650\u00b0C, a second preheat at 845\u2013870\u00b0C, short austenitizing for about 2\u20135 minutes after temperature […]<\/p>\n","protected":false},"author":1,"featured_media":15110,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"knowledge-article","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":"[]"},"class_list":["post-11688","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nM2 Steel Heat Treatment: Hardening, Tempering & 60\u201365 HRC Chart<\/title>\n<meta name=\"description\" content=\"M2 heat treatment guide with preheating, austenitizing, quenching, tempering temperatures, and hardness chart. 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A common process uses first preheating at 540\u2013650\u00b0C, second preheating at 845\u2013870\u00b0C, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or salt bath, and tempering at about 538\u2013595\u00b0C.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225180064","position":2,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225180064","name":"What hardness can M2 tool steel reach after heat treatment?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"After proper hardening and tempering, M2 tool steel typically reaches about 60\u201365 HRC. The final hardness depends on the austenitizing temperature, quenching method, tempering temperature, section size, and furnace control.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225180938","position":3,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225180938","name":"What is the austenitizing temperature for M2 tool steel?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The standard austenitizing temperature for M2 tool steel is usually 1190\u20131230\u00b0C. Lower temperatures are used when toughness is more important, while higher temperatures near 1230\u00b0C are used when maximum hardness, wear resistance, and red hardness are required.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225182490","position":4,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225182490","name":"How long should M2 tool steel be soaked at the austenitizing temperature?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"M2 tool steel should be soaked for only a short time at the austenitizing temperature, usually about 2\u20135 minutes after the tool reaches temperature. Long soaking can cause grain coarsening, excessive retained austenite, reduced toughness, and unstable hardness.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225183344","position":5,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225183344","name":"Can M2 tool steel be air quenched?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. M2 can be quenched in air, oil, or a hot salt bath. Air quenching is milder and can help reduce distortion, especially for smaller sections. Oil quenching may give a stronger hardness response, while salt bath quenching offers better temperature equalization and distortion control.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225223632","position":6,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225223632","name":"Why does M2 need double or triple tempering?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"M2 contains a significant amount of retained austenite after quenching. During tempering and cooling between tempers, retained austenite can transform into fresh martensite. The second or third temper is needed to temper this fresh martensite, reduce internal stress, and stabilize final hardness and toughness.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225224577","position":7,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225224577","name":"What is the best tempering temperature for M2 tool steel?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"For many M2 cutting and tooling applications, tempering at 540\u2013565\u00b0C is common because this range is near the secondary hardening peak. It helps balance hardness, cutting performance, toughness, and dimensional stability.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225252503","position":8,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225252503","name":"Why should M2 be tempered immediately after quenching?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"M2 should be tempered immediately after cooling to about 66\u201393\u00b0C because the as-quenched structure is highly stressed and unstable. Delayed tempering can increase the risk of cracking, dimensional changes, and instability due to retained austenite.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225253785","position":9,"url":"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/#faq-question-1778225253785","name":"What causes low hardness after M2 heat treatment?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Low hardness may result from underheating, insufficient carbide solution, incorrect quenching, excessive retained austenite, decarburization, or improper tempering. For M2, both temperature and soaking time must be carefully controlled because the heat-treatment window is narrow.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"}]}},"uagb_featured_image_src":{"full":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"thumbnail":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-150x150.avif",150,150,true],"medium":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-300x300.avif",300,300,true],"medium_large":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-768x768.avif",768,768,true],"large":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-1024x1024.avif",1024,1024,true],"1536x1536":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"2048x2048":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"trp-custom-language-flag":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-12x12.avif",12,12,true]},"uagb_author_info":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/pt\/blog\/author\/admin\/"},"uagb_comment_info":0,"uagb_excerpt":"M2 Tool Steel Heat Treatment Guide M2 tool steel is typically heat-treated by double preheating, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or a salt bath, and double- or triple-tempering at about 538\u2013595\u00b0C. A common process uses a first preheat at 540\u2013650\u00b0C, a second preheat at 845\u2013870\u00b0C, short austenitizing for about 2\u20135 minutes after temperature…","rttpg_featured_image_url":{"full":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"landscape":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"portraits":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"thumbnail":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-150x150.avif",150,150,true],"medium":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-300x300.avif",300,300,true],"large":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-1024x1024.avif",1024,1024,true],"1536x1536":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"2048x2048":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad.avif",1254,1254,false],"trp-custom-language-flag":["https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/05\/M2-heat-treatment-ad-12x12.avif",12,12,true]},"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/pt\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"M2 Tool Steel Heat Treatment Guide M2 tool steel is typically heat-treated by double preheating, austenitizing at 1190\u20131230\u00b0C, quenching in oil, air, or a salt bath, and double- or triple-tempering at about 538\u2013595\u00b0C. 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