1.2367 hot work die steel is a German standard hot work die steel, classified as X38CrMoV5-3 steel. It boasts excellent comprehensive performance and is widely used in mold manufacturing and other fields. Here is a detailed introduction:
Chemical Composition: Carbon (C) 0.35% – 0.40%, Silicon (Si) 0.30% – 0.50%, Manganese (Mn) 0.30% – 0.60%, Phosphorus (P) ≤ 0.035%, Sulfur (S) ≤ 0.010%, Chromium (Cr) 4.70% – 5.20%, Molybdenum (Mo) 2.70% – 3.30%, Vanadium (V) 0.40% – 0.70%.
Properties:
High Toughness and Heat Resistance: It has excellent heat resistance and high-temperature toughness, maintaining good mechanical properties in high-temperature environments and being less prone to fracture.
Good Thermal Fatigue Resistance and Wear Resistance: It exhibits superior thermal fatigue resistance and wear resistance at high temperatures, capable of withstanding repeated thermal cycles and mechanical wear, thereby extending the service life of molds.
Small Heat Treatment Deformation: After heat treatment, the dimensional change is small, ensuring mold precision, making it suitable for manufacturing molds with high dimensional accuracy requirements.
Good Isotropy: Compared with traditionally smelted steel, it has better isotropy, with excellent toughness and plasticity in all directions, and more uniform performance.
Physical Properties:
Density: 7.75 g/cm³.
Coefficient of Thermal Expansion: 11.5×10⁻⁶/K.
Thermal Conductivity: 39 W/(m·K).
Specific Heat Capacity: 460 J/(kg·K).
Mechanical Properties:
Yield Strength (Rp0.2): ≥ 930 MPa.
Tensile Strength (Rm): 1200 – 1450 MPa.
Elongation (A): ≥ 10%.
Reduction of Area (Z): ≥ 35%.
Heat Treatment Process:
Annealing: Usually carried out at 850 – 880°C, with heat preservation for 1 – 2 hours, followed by air cooling or slow cooling to 400°C.
Quenching: The first preheating temperature is 540 – 650°C, with holding for approximately 30 minutes per 25mm; the second preheating temperature is 845 – 870°C, with holding for approximately 30 minutes per 25mm; the austenitizing temperature is 1030 – 1070°C, with holding for approximately 30 minutes per 25mm. Quenching media can be gas or oil.
Tempering: The tempering temperature is 500 – 650°C, with holding for more than 60 minutes per 25mm, followed by air cooling.
Application Fields:
Mold Manufacturing: Commonly used in the production of hot forging dies, aluminum and zinc die-casting dies, aluminum alloy and copper alloy extrusion dies, etc.
Industrial Tools: Can be used to manufacture tools such as hot rolls, hot working punches, and hot-cold working dies.
Aerospace: Suitable for manufacturing components in aero-engines that require high heat resistance and high strength.
Automobile Manufacturing: Applicable to the production of molds for automotive engine components and transmission system parts, etc.