40Mn round bars

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29-May-2024

The material 40Mn is a kind of high-quality carbon structural steel under the standard GB/T 699-1988. 40Mn Chemical composition %:

Grade	Chemical composition %:
Grade	C	Si	Mn	S	P	Cr	Ni	Cu
40Mn	0.37-0.45	0.17-0.37	0.70-1.00	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25

40Mn mechanical properties:

Grade	mechanical properties:
	Tensile strength σb (Mpa)	Yield strength σb (Mpa)	Elongation σb (%)	reduction of area ψ (%)	Hardness No heat treatment	Impacting Energy Akv (J)	Notched bar impact strength αkv (J/cm2)
	min	min	min	min	max	min	min
40Mn	590(60)	355(36)	17	45	229HB	47	59(6)

Notes:
1, 40Mn specification: DIA 80-1200mm(forged round bar), 80-1200mm (square bar) Length 3-16 meters
2, 40Mn heat treatment: Quenching,Annealing,Normalizing and Tempering.
3, 40Mn tolerance: 0-+3mm(DIA), 0-+10mm (Length)

40Mn can be used under the condition normalizing, also can be used under Hardening and tempering. 40Mn has good machinability and 40Mn's cold plastic deformation is medium but Poor weldability under cold deformation. 40Mn is used in the manufacture of parts under fatigue load, such as shaft roller and work under the high stress of screw, nut, etc. 40Mn's hardenability is a little higher than 40# steel. 40Mn is also suitable for resistance to fatigue,the crankshaft, roll, axis, connecting rod.

Our company, KUNFENG can produce all sizes of 40Mn forged steel round bar, 40Mn forged square bar, 40Mn forged shafts and 40Mn forged blocks.