hot rolled round bar standard:Chinese GB,ASTM, DIN Material:a42CrMo,42CrMo4,4040 diameter:12-400mm length:6m or more

hot rolled round barstandard:Chinese GB,ASTM, DINMaterial:a42CrMo,42CrMo4,4040diameter:12-400mm length:6m or morefor industry

application:gear,backshaft,drill pipe,mould

and etc

chemical composition:

C: 0.38-0.45

Si: 0.17~0.37

Mn: 0.50~0.80

S: ≤0.035

P:≤0.035

Cr: 0.90~1.20

Ni:≤0.030

Cu:≤0.030

 Mo:0.15~0.25

mechanical propertity:

tensile strength:σb (MPa)≥1080(110)

yield strength:σs (MPa)≥930(95)

elongation:σs (MPa)≥930(95)

hardness:≤217HB

sample diameter:25mm

hot rolled round bar