GB/T 3077 38CrMoAl steel round bars

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11-May-2024

GB/T 3077 38CrMoAl alloy structural steel round bar under GB/T 3077 chinese standard, belongs to a high carbon nitrided steel. GB/T 3077 38CrMoAl can be produced into hot rolled round bars and square bars, cold-drawing bars,forged bars. We Henan KUNFENG can supply all shapes of GB/T 3077 38CrMoAl alloy structural steel round bar.

GB/T 3077 38CrMoAl round bar

GB/T 3077 38CrMoAl round bars is mainly applied to some nitrided steels parts,such as piston bolt, lathe spindle,boring bar,and precision lead screw and so on.

According to the market needs, henan KUNFENG supply the oversea markets for GB/T 3077 38CrMoAl hot rolled round bars OD 6mm -80 mm and 38CrMoAl forged round bars OD 80 mm - 1200 mm, also GB/T 3077 38CrMoAl forged square bars OD 100- 1200 mm. The OD tolerance is about 0-3 mm and length tolerance is about 0-20 mm.

GB/T 3077 38CrMoAl round bars 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 .

GB/T 3077 38CrMoAl round bars chemical composition by %,maximum:

Grade	C	Si	Mn	Cr	Mo	Al	P	S
GB/T 3077 38CrMoAl	0.35-0.42	0.2-0.45	0.3-0.6	1.35-1.65	0.15-0.25	0.7-1.1	≤0.035	≤0.035

GB/T 3077 38CrMoAl round bars 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 38CrMoAl	Hot rolled, forged, or heat treatment	980	835	14	50	229	≥ 4:1	≥ 6	≤ 2.0