carbon steel round bar 40MnB

Product Description

 

Diamater:Ø20mm-Ø310mm

 

Length: standard 6m,9m,12m, If you need special lengths,please tell us.

 

Surface: Bare, polished, grinded,varnished

 

Process:Hot rolled,cold drawn,forged,wrought

 

Inspection: 100% UT test, mill test certificate, third party inspection such as SGS,BV etc.

 

 

Chemical Coposition

 

Grade	C	Si	Mn	S	P	Cr	Ni	Cu	B
40MnB	0.37 0.44	0.17 0.37	1.10 1.40	≤0.035	≤0.035	≤0.30	≤0.30	≤0.30	0.0005 0.0035
40MnBH	0.37 0.44	0.17 0.37	0.95 1.40	≤0.035	≤0.035	≤0.30	-	-	0.0005 0.0035

 

 












 

Physical Properties

 

Grade	Tensile strength (σb/MPa)	Yield Strength  (σs /MPa)	Elongation %	Shrinkage ψ (%)	Impact  Energy Akv (J)	HBS J/cm2
40MnB	980	785	10	45	47	≤207
40MnBH	980	785	10	45	69	≤207

 

 

 

Heat treatment:

 

40MnBH:Normalizing(800℃-900℃)+Quenching(850℃)+Tempering(510℃)

 

40MnB:Quenching(850℃)+Tempering(500℃)