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Steel Grade: CPM Rex M4 | Equivalently AISI: M4 CHEMICAL COMPOSITION(CPM Rex M4): 
C(％) :         1.35
Cr(％) :         4.25
W(％) :         5.75
Mo(％) :         4.50
V(％) :         4.00
Co(％) :         —
Other(％) :         S0.06
Hardness HRC :         64～66
Remark(CPM Rex M4): 
①, The steel grade suffix HC-->High carbon, HS-->High sulphur.
Please find the PDF for CPM Rex M4  

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Introduction Cemented Carbide (CPM Rex M4)
Cemented carbide is made of refractory metal hard compound and binding metal through powder metallurgy technology made of an alloy material.
Cemented carbide with high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and a series of excellent properties, especially its high hardness and wear resistance, even under the temperature of 500 ℃ is basic remains the same, there are still very high hardness at 1000 ℃.

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ASTM D2, X155CrMoV12-1, ASTM D3, AISI H11, AISI H13,  CPM Rex M4