6W6Mo5Cr4V die steel is low-carbon high-speed die steel. Compared with W6Mo5Cr4V2, the mass fraction of carbon is reduced by 0.21%. The mass fraction of vanadium is reduced by 1.05%–1.11%. The inhomogeneity of carbides is significantly improved. The bending strength and plasticity are increased by 30%~50%. The impact toughness is increased by 50%~100%.


6W6Mo5Cr4V Chemical Composition


6W6Mo5Cr4V Mechanical Properties

Proof strength
Tensile strength
Impact energy
Elongation at fracture
Reduction in Cross-section on fracture
As-Heat-Treated ConditionBrinell hardness(HBW)
472(≥)749(≥)333223Solution and Aging, Annealing, Ausaging, Q+T431

6W6Mo5Cr4V Physical properties

Temperature T
Modulus of elasticity
Specific heat
Thermal conductivity
Electric resistance
Creep strain limit
Creep rupture strength
4114Solution and Aging,Annealing, Ausaging,Q+T862597

Heat Treatment 

Forging Process

6W6Mo5Cr4V mold steel has a narrow forging temperature range due to its high molybdenum content. The forging process is: the heating temperature is 1100~1140℃. The initial forging temperature is 1050~1100℃. The final forging temperature is 800~900℃.

The forging deformation resistance of 6W6Mo5Cr4V mold steel is relatively large.

Annealing process

6W6Mo5Cr4V mold steel is annealed after forging.

The ordinary spheroidizing annealing process: heating to 850~860℃ for 1~2h, cooling to 550℃ and then air cooling;

The isothermal spheroidizing annealing process: heating to 850~860℃ for 1~2h. The furnace is cooled to 740~750℃ and then kept for 3~4h. After the furnace is cooled to 550 ℃, it is air-cooled and the annealing hardness is 197~255HBS.

Quenching and tempering process

To get good toughness and higher wear resistance, lower and higher temperature tempering are usually used.

The process parameters: heating to 1180~1200℃ for quenching, 560~580℃. Temper three times. Every 1.5h, the hardness is 69~63HRC.

Features and Application

6W6Mo5Cr4V mold steel can be used to replace high-speed mold steel and high-carbon and high-chromium mold steel. It can be used to manufacture cold extrusion punches or cold heading punches for steel materials. The service life can be increased by 2 to 10 times.

6W6Mo5Cr4V Steel 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