8Cr2MnWMoVS is a free-cutting precision plastic forming mold steel. It is designed to meet the needs of precision plastic molds and thin-plate precision blanking dies. Its composition design adopts the principle of high carbon multi-component and a small amount of alloying. Sulfur is used as a free-cutting element.

8Cr2MnWMoVS 8Cr2S

8Cr2MnWMoVS Steel Chemical Composition


8Cr2MnWMoVS Steel Mechanical Properties

Rp0.2 (MPa)
Rm (MPa)
KV/Ku (J)
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated ConditionBrinell hardness (HBW)
152 (≥)231 (≥)414111Solution and Aging, Annealing, Ausaging, Q+T,etc243

8Cr2MnWMoVS Steel Physical properties

Modulus of elasticity
Thermal conductivity
Specific thermal capacity
Specific electrical resistivity
(Ω mm²/m)
Poisson’s coefficient, νMean coefficient of thermal expansion 10-6/(°C) between 20(°C) and
24  0.42 
12514.2  23233432

Heat Treatment 

  1. Forging.
    The heating temperature is 1100-1150℃. The initial forging temperature is 1060℃. The final forging temperature is >900℃.
    The alloy content of the steel is medium. The carbides are small and evenly distributed. The forging deformation resistance is small. The forging processability is good. The key is that it must be cooled slowly (charcoal or hot ash) after forging. It is best to hot-load annealing to remove stress. Otherwise, the forgings are prone to longitudinal surface cracks.
  2. Annealing.
    Spheroidizing annealing or general annealing process can be used. The machining performance is better than that of general tool steel. The spheroidizing annealing hardness is 220-240HBS. Annealing hardness is about 240HBS.
  3. Quenching and tempering.
    When making pre-hardened steel, the recommended heat treatment process is 860-880 ℃ quenching. The quenching hardness is 62-64HRC. Tempering at 550-620℃ for 2h. Tempering hardness is 40-48HRC. Various conventional processing can be carried out.

Features and Application

8Cr2MnWMoVS die steel has a simple heat treatment process and good hardenability. For example, the diameter of air cooling can reach 100mm. The quenching hardness is high. The toughness and toughness of cutting performance and polishing and grinding performance.

It can be used as pre-hardened steel. It is suitable for making precision molds and printed board punching molds for various plastics, bakelite, rubber, ceramics and other products. The matching accuracy of the mold made of this steel is 1-2 orders of size higher than that of other total tool steels. The surface roughness value is 1-2 levels lower, and the service life is increased by more than 2-10 times.

As a high-hardness, high-strength and toughness steel, it is suitable for making blanking dies. Because of its high quenching and tempering hardness, good strength and toughness, and small heat treatment deformation, it has high molding precision and long service life.


8Cr2MnWMoVS 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