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Henan Bebon Iron&Steel Co.,Ltd is a steel-bar-specialized factory, located in zhengzhou city, south of henan province. Found in 2000, it takes an area of 520,000 square meters.

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20Mn round bars

The material 20Mn is a kind of high manganese low carbon steel penetration under the standard GB/T 699-1988.
20Mn Chemical composition %:

Grade	Chemical composition %:
Grade	C	Si	Mn	S	P	Cr	Ni	Cu
20Mn	0.17-0.24	0.17-0.37	0.7-1.00	≤0.035	≤0.035	≤0.25	≤0.25	≤0.25

20Mn mechanical properties:

Grade	mechanical properties:
	Tensile strength σb (Mpa)	Yield strength σb (Mpa)	Elongation σb (%)	reduction of area ψ (%)	Hardness No heat treatment
	min	min	min	min	max
20Mn	450(46)	275(28)	24	50	197HB

Notes:
1,20Mn specification: DIA 80-1200mm(forged round bar), 80-1200mm(square bar) Length 3-16 meters
2,20Mn heat treatment: Quenching,Annealing,Normalizing and Tempering.
3,20Mn tolerance: 0-+3mm(DIA), 0-+10mm(Length)
The grade 20Mn’s properties are similar with 15Mn. 20Mn has higher strength. Plastic,machinability But cutting and a little higher than 15 steel hardenability and hardenability than 15Mn. 20Mn has good toughness after hot rolling or normalizing treatment.
The material 20Mn is widly used for gear, crankshaft, bracket, a chain, screw, nut, welding structure, manufacturing oil tank, etc.
Our company, Bebon international can produce all sizes of 20Mn forged steel round bar, 20Mn forged square bar, 20Mn forged shafts and 20Mn forged blocks.