
Nástrojová ocel Cr5Mo1V pro práci za studena
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Cr5Mo1V is a medium alloy air-hardening cold work tool steel, also classified as a high carbon medium chromium tool steel. It is recognized by the unified digital code T20503 and equivalent to American Ocel A2, JIS SKD12 in Japan, and DIN 1.2363 in Germany. It is a versatile material, particularly suitable for applications that demand both good wear resistance and good toughness.
1. Chemical Composition(GB/T 1299—2000)
| C | Si | Mn | Cr | Mo | PROTI | P | S |
|---|---|---|---|---|---|---|---|
| 0.95 – 1.05% | ≤0,50% | ≤1,00% | 4.75 – 5.50% | 0.90 – 1.40% | 0.15 – 0.50% | ≤0,030% | ≤0,030% |
2. Physical Properties of Cr5Mo1V Steel
2.1 Cr5Mo1V Steel Critical Temperature
| Kritický bod | Ac1 | Klimatizacecm | paní |
| Teplota/°C | 795 | — | 168 |
2.2 Cr5Mo1V Steel Linear Expansion Coefficient
| Temperature /°C | 20 ~ 100 | 20 ~ 300 | 20 ~ 500 | 20 ~ 700 |
| Linear Expansion Coefficient α/ ×10⁻⁶°C⁻¹ | 8.2 | 11.3 | 12.4 | 12.9 |
2.3 Cr5Mo1V Steel Other Physical Properties
| Hustota / (g/cm³) | Modulus of Elasticity E (Room Temperature) /MPa | Měrná tepelná kapacita cₚ/ [J/(kg·K)] |
| 7.84 | 203000 | 460.55 |
3. Cr5Mo1V Steel Forging Process Specification
| Položka | Teplota ohřevu/°C | Počáteční teplota kování/°C | Konečná teplota kování/°C | Způsob chlazení |
| Ocelový ingot | 1100 ~ 1150 | 1050 ~ 1100 | 850 ~ 900 | Vysokoteplotní žíhání, ochlazování jámy nebo chlazení pískem |
| Ocelový předvalek | 1050 ~ 1100 | 1000 ~ 1050 | 850 ~ 900 | Chlazení v jámě nebo chlazení pískem |

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4. Heat treatment of Cr5Mo1V Steel
4.1 Předehřívání
| Předběžný plán tepelného zpracování | Procesní parametry |
| Obecné žíhání po kování | Heating temperature is 840 ~ 870°C, hold for 2 ~ 3h; furnace cool to below 550°C then air cool, hardness ≤248HBW |
| Izotermické žíhání po kování | Heating temperature is 830 ~ 850°C, hold for 2h; isothermal temperature is 710 ~ 730°C, hold for 2 ~ 4h, furnace cool to 500°C then air cool or furnace cool to room temperature, hardness after annealing ≤248HBW |
4.2 Kalení
① Doporučená specifikace procesu kalení
| Plan | First Preheating Temperature/°C | Second Preheating Temperature/°C | Teplota kalení/°C | Chlazení | Tvrdost HRC |
| já | 300 ~ 400 | 800 ~ 850 | 940 ~ 960 | Air cooling or oil cooling | 62 ~ 63 |
| II | 300 ~ 400 | 800 ~ 850 | 980 ~ 1010 | Air cooling or oil cooling | 62 ~ 65 |
② Effect of Quenching Temperature on Hardness
| Teplota kalení/°C | 875 | 900 | 960 | 980 | 1020 | 1050 |
| Tvrdost HRC | 46.5 | 54 | 64.5 | 64.5 | 63 | 58 |
4.3 Temperování
① Doporučená specifikace procesu popouštění
| Plán kalení | Teplota popouštění/°C | Počet chvění | Tvrdost HRC |
| já | 180 ~ 220 | 1 | 60 ~ 64 |
| II | 510 ~ 520 | 2 | 57 ~ 60 |
② Effect of Tempering Temperature on Hardness
| Podmínka kalení | Teplota popouštění/°C | 100 | 200 | 300 | 400 | 450 | 500 | 520 | 580 |
| 954°C Kalení | Tvrdost HRC | 64.5 | 62 | 58 | 57 | 56 | 59 | 56 | 51 |
| 982°C Kalení | Tvrdost HRC | 65 | 62 | 58 | 58 | 56 | 58 | 57 | 51.5 |
5. Mechanické vlastnosti
Cr5Mo1V steel is a free-hardening steel exhibiting high free-hardening properties. It features relatively low quenching distortion, high hardness, excellent wear resistance, and moderate toughness, delivering outstanding overall mechanical properties.
Mechanical Properties of Cr5Mo1V Steel after Tempering
| Teplota popouštění/°C | Tvrdost HRC | Tensile Strength/MPa | Yield Strength/MPa | Prodloužení (%) | Zmenšení plochy (%) |
| 530 | 54.1 | 1849 | — | — | — |
| 593 | 46.7 | 1596 | 576 | 5.0 | 13.9 |
Note: 980°C air cooling.
6. Aplikace
Cr5Mo1V steel exhibits excellent comprehensive mechanical properties, making it particularly suitable for manufacturing tools and dies that require both high wear resistance and good toughness, as well as dimensional stability. Examples include rollers, punches, blanking dies, forming dies, rolling dies, wire drawing dies, and thread rolling dies. It is also used for certain types of shear blades.



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