25Mn round bars

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11-May-2024

The material 25Mn is a kind of high-quality carbon structural steel under the standard GB/T 699-1999. 25Mn unified digital code: U21252.
25Mn Chemical composition %:

Grade	Chemical composition %:
Grade	C	Si	Mn	S	P	Cr	Ni	Cu
25Mn	0.22-0.29	0.17-0.37	0.70-1.00	≤0.035	≤0.035	≤0.25	≤0.25	≤0.25

25Mn 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 Aku2 (J)	Notched bar impact strength αkv (J/cm2)
	min	min	min	min	max	min	min
25Mn	490(50)	295(30)	22	50	207HB	71	88(9)

Notes:
1, 25Mn specification: DIA 80-1200mm(forged round bar), 80-1200mm(square bar) Length 3-16 meters
2, 25Mn heat treatment: Quenching,Annealing,Normalizing and Tempering.
3, 25Mn tolerance: 0-+3mm(DIA), 0-+10mm(Length)
The grade 25Mn’s strength is higher than 20Mn and 20# steel. Other properties for 25Mn are similar with 20Mn and 25# steel.
The material 25Mn is widely used for carburizing and welding parts, such as CAM shaft, gear, coupling, hinge, pin, trolley, etc.
Our company, KUNFENG can produce all sizes of 25Mn forged steel round bar, 25Mn forged square bar, 25Mn forged shafts and 25Mn forged blocks.