3Cr2Mo mold steel is a general-purpose pre-hardened plastic mold steel. It is a plastic mold steel widely used in various countries.

3Cr2Mo steel has good hardenability and certain toughness. 3Cr2Mo can be carburized. After carburizing and quenching, the surface hardness can reach 65HRC. It has high hot hardness and wear resistance.


3Cr2Mo Steel Worldwide Equivalents

StandardGBASTM A681DIN EN ISO 4957

 3Cr2Mo Chemical Composition


3Cr2Mo Steel Mechanical Properties

Yield Strength Rp0.2(MPa)Tensile Strength Rm(MPa)Impact Energy AKV(J)Elongation at Fracture A(%)
827-862 MPa965-1030 MPa≥ 78≥ 12
Elastic ModulusImpact toughness value αkv (J/cm2)Hardness(Brinell) 
190-210 GPa27.1-33.9 J≤ 300 

Physical Properties

Density0.284 lb/in3 (7861 kg/m3)
Specific Gravity7.86
Modulus of Elasticity30 x 106 psi (207 GPa)
Thermal Conductivity24 Btu/ft/hr/°F
Machinability60-65% of a 1% carbon steel

Heat Treatment 


Heating temperature 1100-1150℃. Initial forging temperature 1050-1100℃, final forging temperature ≥850℃. Air cooling after forging.


Heating temperature 850℃, holding for 2-4h. Isothermal temperature 720℃, holding for 4-6h. Furnace cooling to 500℃, air-cooling.

Quenching, tempering

Quenching heating temperature 860-870 ℃, oil quenching. 540-580 ℃ tempering. The prehardened hardness is 30-35HRC.

Chemical heat treatment

3Cr2Mo die steel has good hardenability and certain toughness and can be carburized. After carburizing and quenching, the surface hardness can reach 65HRC. Has high hot hardness and wear resistance.


1)uniform hardness qualitative of Material;
2)No quenching crack danger,Without heat treatment costs that can reduce the tool cost;
3)Excellent polishing performance;
4)Good machining performance;


  • 1) It can be used to make large injection molds or extrusion molds.
  • 2) This steel is suitable for making large plastic molds. Such as TV sets, shells of large tape recorders and panel covers of washing machines.
  • 3) Suitable for compression molds.
  • 4) Suitable for corrosion resistance, high precision molds

3Cr2Mo products

Product typeProductsDimensionProcessesDeliver Status
Plates/SheetsPlates/Sheets0.08-200mm(T)*W*LForging, hot rolling, and cold rollingAnnealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel BarRound Bar, Flat Bar, Square BarΦ8-1200mm*LForging, hot rolling and cold rolling, CastBlack, Rough Turning, Shot Blasting,
Coil/StripSteel Coil/Steel Strip0.03-16.0x1200mmCold-Rolled&Hot-RolledAnnealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes/TubesSeamless Pipes/Tubes, Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion, Cold Drawn, WeldedAnnealed, Solution and Aging, Q+T, ACID-WASHED

Our Services

1. The price is determined according to the material, size, finishing process and different payment methods

2. Each material has been ut tested

3. We have every kind of material in stock, so we can deliver it in time.

4. The size of steel can be customized according to customer requirements, and the minimum order quantity and specification model can be developed / produced according to international, Chinese or industrial standards

5. There are more services. Welcome to consult.