Product information

5Cr5MoWVSi, as a medium and high alloy hot work die steel, has achieved a balance between high temperature strength (600 ℃) and thermal fatigue performance through W-Mo-V composite carbide strengthening and optimized heat treatment process. When it replaces 3Cr2W8V, the service life of copper alloy die-casting die is increased by more than 50%, and the impact toughness of shield cutter ring is more than 30 J/cm ². It is an ideal material for complex thermo-mechanical coupling conditions (such as ferrous metal extrusion and hard rock tunneling). This die steel has the core advantages of "high hardness + corrosion resistance and wear resistance + fine grain structure", and is suitable for high-load and long-life die scenarios.

Smelting method

Electric arc furnace primary smelting + refining + vacuum degassing: electric arc furnace (EAF) smelting is adopted, and LF furnace refining and VD vacuum degassing processes are combined to reduce gas content (H ≤ 2.0 ppm) and inclusions; Optional process optimization: Electroslag remelting (ESR) is adopted for high-end products to further improve purity and structure uniformity (refer to 4Cr5MoWVSi process of similar steel);

Process Characteristics

Heat treatment process:

Annealing: heat preservation and slow cooling at 760 ~ 780 ℃, hardness ≤ 248HBW, optimized machinability; The hardness is 61 ~ 64HRC after oil quenching at 990 ~ 1030 ℃, and the comprehensive properties are the best after quenching at 1030 ℃. Tempering: tempering twice at 420 ~ 550 ℃ (three times at 540 ℃ are recommended), hardness 38 ~ 58HRC, toughness and wear resistance;

Hot processing control: the forging temperature is between 1,180 and 850 deg C, and coarse carbide is prevented from being precipitated at a low temperature; Purity Inclusion control: non-metallic inclusion ≤ 2.0 (GB/T 10561), sulfur and phosphorus content ≤ 0.030%;

Gas content: hydrogen content ≤ 2.0 ppm (vacuum degassing process guarantee);

Micro-Structure

Quenched state: tempered martensite matrix + fine MC/MC type carbides (such as VC, MoC), carbides are evenly dispersed; Annealed state: granular pear-lite + spheroidized carbide, grade 4-4.5;

Impact Work

Toughness performance: after quenching at 1030 ℃ and tempering at 540 ℃ for three times, the impact energy reaches 32.4 J/cm ², which is significantly better than that of traditional hot work die steel (such as 3Cr2W8V);

Ultrasonic Flaw Detection

Executive standard: GB/T 6402-91 or GB/T 2970 Grade I, internal defects ≤ φ2mm equivalent, no macroscopic defects such as white spots and cracks (refer to the standards of similar hot-working die steel);

Ex-Factory status

Annealed delivery: hardness ≤ 248HBW (convenient for machining);

Size Specification

Product Main features

Product Application Area

Hot work mold: 

Die casting mold: aluminum alloy/magnesium alloy die casting mold (resistant to molten metal erosion);

Extrusion die: extrusion mandrel and die for copper alloy pipe (working temperature ≤ 700 ℃);

Precision forging die: gear precision forging die, connecting rod forging die (thermal fatigue crack resistance);

Engineering tools: Cutter ring of shield machine (wear resistance requirements for hard rock stratum);

Hot shear blade (high temperature wear resistance requirements);

Packing and Shipping

Generally, we will arrange the packing and shipping according to the customer's requirements, whether to pack and arrange the suitable transportation mode and vehicle, such as whether to directly load the truck for transportation, whether to bring the packing steel belt, whether to pack the spray mark and so on.

1.2379 tool steel, the European DIN standard designation for a 12% chromium cold work steel (similar to AISI D2 and SKD11), is engineered for precision tooling. What sets 1.2379 tool steel apart is its "through-hardening" characteristic; even in larger sections, 1.2379 tool steel exhibits minimal distortion during quenching, guaranteeing that tight tolerances are maintained after heat treatment. This specific grade of 1.2379 tool steel undergoes vacuum degassing to ensure superior cleanliness and uniform carbide distribution .

The mechanical resilience of 1.2379 tool steel is complemented by its physical stability. With a modulus of elasticity of 210,000 MPa and a coefficient of thermal expansion that remains stable at elevated temperatures, 1.2379 tool steel resists deflection and heat checking under load. Furthermore, optional deep cryogenic treatment of 1.2379 tool steel (cooling to -80°C) can transform retained austenite, boosting hardness by an additional 1-3 HRC and enhancing the material"s dimensional stability for high-precision applications .

End-users select 1.2379 tool steel for components that demand high compression strength and wear resistance. Whether used for fine-blanking punches, embossing dies, or woodworking knives, 1.2379 tool steel delivers a reliable balance of toughness and abrasion resistance. To maximize the lifespan of tools made from 1.2379 tool steel, manufacturers often utilize its secondary hardening capability through high-temperature tempering or apply surface coatings, making 1.2379 tool steel a versatile and economical choice for the tool room.