6CrW2Si Tool Steel

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6CrW2Si tool steel is a versatile alloy tool steel suitable for both cold and hot working applications, characterized by its impact toughness and wear resistance. Compared to the 4CrW2Si and 5CrW2Si grades, 6CrW2Si typically achieves higher hardness after quenching and exhibits better strength at elevated temperatures.

1. Chemical Composition(GB/ T 1299—2000)

CSiMnCrWPAGS
0.55 ~ 0.650.50 ~ 0.80≤0,401.10 ~ 1.302.20 ~ 2.70≤0.030≤0.030

2. Temperatura del punto crítico of 6CrW2Si

Punto críticoAc₁Ac₃Sra.
Temperature (Approx. Value) /°C775810280

3. Forging Process Specification for 6CrW2Si Steel

ArtículoTemperatura de calentamiento/°CTemperatura de forja inicial/°CTemperatura final de forja/°CRefrigeración
Lingote de acero1170 ~ 12001150 ~ 1180≥850Enfriamiento lento
Palanquilla de acero1150 ~ 11701100 ~ 1140≥800Enfriamiento lento
6CrW2Si

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4. Tratamiento térmico for 6CrW2Si Steel

1) Preheating of 6CrW2Si

Plan preliminar de tratamiento térmicoParámetros del proceso
Post-forging General AnnealingHeating temperature is 800 ~ 820°C, hold for 3 ~ 5h, furnace cool to below 550°C, then air cool. Hardness is 229~285HBW. Microstructure is granular pearlite + small amount of carbides.
High-temperature Tempering ProcessHeating temperature is 700 ~ 730°C, hold for 2 ~ 4h, furnace cool to below 500°C then air cool. The purpose is to improve the machinability of the steel.

2) Quenching of 6CrW2Si

Temperatura de enfriamiento/°CQuenching Cooling MediumQuenching Cooling Medium Temperature/°CCool toDureza HRC
860 ~ 900Aceite20 ~ 40Oil Temperature≥57

3) Tempering of 6CrW2Si

① Tempering Process Specification

PropósitoTemperatura de revenido/°CHeating MediumMedio de enfriamientoDureza HRC
Eliminate internal stress and stabilize microstructure200 ~ 250Oil or molten saltAire53 ~ 58
Reduce hardness and eliminate internal stress430 ~ 470Air furnace or molten salt, saltpeterAire45 ~ 50

② Relationship between Hardness and Tempering Temperature

Temperatura de revenido/°CNo templado100200300400500550600
Dureza HRC5958565349423835

Note: 880°C oil quenched.

5. Mechanical Properties

6CrW2Si steel possesses relatively high toughness, high as-quenched hardness, a certain degree of high-temperature strength, and high fatigue strength. It exhibits slight temper brittleness when tempered in the range of 300-350°C. The hardness can reach 54-56 HRC after tempering at 250°C, and 50-52 HRC after tempering at 450°C. This steel’s resistance to tempering and its wear resistance are slightly superior to those of 5CrW2Si steel, but its toughness is comparatively lower.

Chromium-tungsten-silicon (Cr-W-Si) series steels demonstrate high sensitivity to decarburization, and their quenching deformation is difficult to control. Under abrasive wear conditions, they show insufficient wear resistance, and their impact toughness is lower than that of impact-resistant steels containing Molybdenum (Mo) and Nickel (Ni).

6. Applications

6CrW2Si steel is often used to manufacture heavy-duty stamping dies and cold-pressing dies where the failure modes are wear and collapse, or for manufacturing tools and dies that are subjected to impact loads and require high wear resistance, such as pneumatic tools, impact dies, cold shearing blades, blanking and trimming dies, and tools for air hammers.

7. Calificaciones equivalentes

  • USA (ASTM/AISI): S1
  • Alemania (DIN): 60WCrV7 or 1.2550
  • Rusia (GOST): 5KHV2S
  • Europe (EN): 60WCrV8

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With over 20 years of forging expertise, Aobo Steel is your trusted partner for high-performance 6CrW2Si tool steel. We provide not just materials, but solutions. Leverage our deep industry knowledge and reliable supply chain for your project’s success.

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