GB/T 3077 20CrNiMo round bars

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11-May-2024

GB/T 3077 20CrNiMo alloy structural steel under GB/T 3077 chinese standard, belongs to a high carbon nitrided steel. GB/T 3077 20CrNiMo can be produced into hot rolled round bars and square bars, cold-drawing bars,forged bars. We henan KUNFENG can supply GB/T 3077 20CrNiMo all of shapes.

GB/T 3077 20CrNiMo round bar

is mainly for manufacturing shock absorber which works in quaking load,such as elastic axis, torsion shaft of heavy-duty car and driving truck. has excellent hardenability, without temper brittleness, good weldablity, super machinability and ductility. is generally used in quenching and tempering or carburizing and quenching delivery state.

According to the market needs, henan KUNFENG supply the oversea markets for GB/T 3077 20CrNiMo hot rolled round bars OD 6mm -80 mm and 20CrNiMo forged round bars OD 80 mm - 1200 mm, also GB/T 3077 20CrNiMo forged square bars OD 100- 1200 mm. The OD tolerance is about 0-3 mm and length tolerance is about 0-20 mm.

are usually produced under the followed procedures: EAF arc furnace + LF purify affinage + VDF + ingot steel(bottom gating /argon) + forged + annealing + black polishing (turnery) + GB/T6402-92 ΙΙ UT test + smooth edges with sawing .

chemical composition by %,maximum:

Grade	C	Si	Mn	Cr	Ni	Mo	Cu	P	S
GB/T 3077 20CrNiMo	0.17-0.23	0.17-0.37	0.6-0.95	0.4-0.7	0.35-0.75	0.2-0.3	≤ 0.3	≤0.035	≤0.035

mechanical properties

Grade	Delivery State	T.S. N/mm2 Min	Y.S. N/mm2 Min	A,% Min	Z,% Min	Hardness, (annealing or tempering) HB,max	Forging ratio	Grain Size (level)	Nonmetal ratio
GB/T 3077 20CrNiMo	Hot rolled, forged, or heat treatment	980	785	9	40	197	≥ 4:1	≥ 6	≤ 2.0