Aobo Steel supplies H11 tool steel for your project

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H11 tool steel is an air-cooling hardening hot work tool steel known for its excellent toughness, thermal strength, fatigue performance, and wear resistance at medium temperatures. Additionally, it retains some toughness in the quenched state and demonstrates strong resistance to thermal fatigue. When air-quenched at lower austenitizing temperatures, it exhibits minimal heat treatment deformation and a low tendency to form oxide skin.

Moreover, it can effectively resist the erosion of molten aluminum. As a result, H11 tool steel is commonly used to manufacture aluminum die-casting molds, hot extrusion tools, press forging dies, and plastic molds.

The designation for this steel is H11 in the U.S. ASTM A681 system. Similarly, other national standards use comparable designations, such as ISO X37CrMoV5-1, Japan/JIS SKD6, USA/UNS T20811, Germany/DIN X38CrMoV5-1, Germany/W-Nr. 1.2343, and Czech Republic (CSN) 19552.

H11 tool steel Applications

H11 tool steel is widely used in industries where tools must withstand both high heat and mechanical stress. Its excellent thermal stability, toughness, and wear resistance suit various demanding applications.

Die Casting Dies: H11 is commonly used for casting aluminum, zinc, and magnesium due to its high thermal stability and toughness, ensuring durability in extreme conditions.
Forging Dies: Because it can resist bending at high temperatures, H11 is a preferred choice for forging dies and hot-forming tools, maintaining strength under intense pressure.
Extrusion Tools: This steel is ideal for extrusion dies used in metal and plastic processing. It offers excellent wear resistance and can perform under high-temperature conditions.
Hot Shear Blades: Thanks to its superior heat and wear resistance, H11 is perfect for manufacturing blades that cut hot metals efficiently and maintain their sharpness.
Aerospace Components: H11 is also utilized in critical aerospace parts such as landing gear, where strength, fatigue resistance, and reliability are essential.

The benefits of choosing Aobo Steel as your H11 steel supplier

With over 40 processing suppliers surrounding us, we can deliver more than 2,000 tons of steel monthly.

We offer over 100 types of steel, including tool, alloy, stainless, alloy structural, and carbon steel.

With over 20 years of experience in forged tool steel production, we have a deep understanding of our products.

H11 tool steel overview

H11 steel is an air-hardening hot work tool steel. It is one of the three most commonly used steels in the European die-casting industry. It is resistant to thermal fatigue and erosion and has good cold and hot workability. This steel has slightly higher toughness than H13 steel. It requires heat treatment and is generally used at 50 to 54 HRC hardness.

Chemical composition

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Vanadium (V)	Silicon (Si)	Manganese (Mn)
0.33 – 0.43%	4.75 – 5.50%	1.10 – 1.60%	0.30 – 0.60%	0.80 – 1.20%	0.20 – 0.50%

Properties

1. Critical Temperatures

Critical Point	Ac1	Ac3	Ar1	Ar3	Ms	Mf
Temperature (Approximate Value) / °C	853	912	720	773	310	103

2. Linear Expansion Coefficient

Temperature (°C)	20~100	20~200	20~300	20~400	20~500	20~600	20~700
Linear Expansion Coefficient (×10^-6 °C^-1)	10.0	10.9	11.4	12.2	12.8	13.3	13.6

3. Thermal Conductivity

Temperature (°C)	100	200	300	400	500	600	700
Thermal Conductivity (W·(m·K)^-1)	25.9	27.6	28.4	28.0	27.6	26.7	25.9

4. Elastic Modulus

Temperature (°C)	20	100	200	300	400	500
Elastic Modulus (GPa)	227	221	216	208	200	192

Heat treatment

Pre-Heat Treatment

General annealing: heat to 860 ~ 890°C, hold for 2 ~ 4 hours, cool to below 500°C in the furnace, then air cool, achieving a hardness after annealing of ≤ 229 HBW.

Stress Relief Annealing: Heating temperature is 730-760℃, holding for 3-4 hours, followed by furnace cooling or air cooling.

Quenching

Preheat the material to (790 ± 15)°C, then heat to (1000 ± 6)°C (salt bath) or (1010 ± 6)°C (furnace-controlled atmosphere), maintain for 5-15 minutes, quench in air, achieving 53-55 HRC hardness.

Tempering

Preheat the material to 550 ~ 560°C, cool in air, and temper twice, with the second tempering 20 ~ 30°C lower than the first, to achieve 47 ~ 49 HRC hardness.

H11 tool steel Forging process

Heating Temperature (°C)	Starting Forging Temperature (°C)	Final Forging Temperature (°C)	Cooling Method
1120 ~ 1150	1050 ~ 1100	≥850	Slow Cooling (Pit Cooling or Sand Cooling)

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H11 tool steel equivalents: DIN 1.2343 and JIS SKD6

IIn the German and Japanese steel standard systems, H11 tool steel is equivalent to DIN 1.2343 and JIS SKD61. All of them are hot work tool steels. These hot work tool steels are particularly noted for their thermal shock and fatigue resistance. They exhibit good dimensional stability after heat treatment with minimal deformation, thermal conductivity, hardenability, and hot hardness.

DIN 1.2343 steel overview

1.2343 Chemical composition

Carbon (C)	Chromium (Cr)	Molybdenum (Mo)	Vanadium (V)	Silicon (Si)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)
0.35 – 0.45	4.80 – 5.50	1.10 – 1.30	0.30 – 0.50	0.80 – 1.20	0.20 – 0.50	≤ 0.030	≤ 0.030

1.2343 Properties

Property	Value
Density	7.8 g/cm³
Thermal Conductivity	27.0 W/m·K
Hardness (After Heat Treatment)	48 – 55 HRC
Tensile Strength	1300 MPa
Modulus of Elasticity	210 GPa
Melting Point	1420°C – 1450°C

JIS SKD6 steel overview

SKD6 Chemical composition

C (Carbon)	Si (Silicon)	Mn (Manganese)	P (Phosphorus)	S (Sulfur)	Cr (Chromium)	Mo (Molybdenum)	V (Vanadium)
0.32 – 0.42	0.80 – 1.20	< 0.50	≤ 0.030	≤ 0.020	4.5 – 5.5	1.0 – 1.5	0.3 – 0.5

SKD6 Properties

Property	Value
Density	7.80 g/cm³
Thermal Conductivity	24.0 W/m·K
Hardness (After Heat Treatment)	58 – 62 HRC
Elastic Modulus	200 GPa
Tensile Strength	900 – 1100 MPa
Melting Point	1420°C (2588°F)