65Mn round bars

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11-May-2024

The material 65Mn is a kind of spring steel under the standard GB/T 1222-2007.
65Mn Chemical composition %:

Grade	Chemical composition %:
Grade	C	Si	Mn	S	P	Cr	Ni	Cu
65Mn	0.62-0.70	0.17-0.37	0.90-1.20	≤0.035	≤0.035	≤0.25	≤0.25	≤0.25

65Mn mechanical properties:

Grade	mechanical properties:
	Tensile strength σb (Mpa)	Yield strength σb (Mpa)	Elongation σb (%)	reduction of area ψ (%)	Hardness
				min	hot rolled	Cold rolled soft	Cold-rolled hard	Heat treatment
65Mn	825-925	520-690	14-21.5	10	240-270HB	190-220HB	300~340HB	38~60HRC

Notes:
1, 65Mn specification: DIA 80-1200mm(forged round bar), 80-1200mm(square bar) Length 3-16 meters
2, 65Mn heat treatment: Quenching,Annealing,Normalizing and Tempering.
3, 65Mn tolerance: 0-+3mm(DIA), 0-+10mm(Length)

65Mn’s strength is higher and has a certain toughness and plasticity after heat treatment and cold drawn after hardening. In the same surface and hardening case completely ,the fatigue limit of 65Mn is similar with alloy spring. But 65Mn’s hardenability is poor. 65Mn is mainly used for the smaller size of the spring, such as regulating speed regulating spring, spring load, general machinery in the round, square spiral spring or pull wire for small mechanical spring.
Our company, KUNFENG can produce all sizes of 65Mn forged steel round bar, 65Mn forged square bar, 65Mn forged shafts and 65Mn forged blocks.