GB/T 699 20# round bar

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11-May-2024

20# carbon steel is very common is china market under GB/T 699 standard. For GB/T 699 20# carbon steel,we henan KUNFENG can offer forged round bars OD 80 mm - 1200 mm.

GB/T 699 20# round bar is widely used in the various fields. GB/T 699 20# round bar is mainly applied to machinery parts which requires high toughness and bears small stress,such as lever,axle sleeve,straining beam. GB/T 699 20# round bar can also be used in the line of agricultural machinery or cars, to produce carburization or carbonitriding parts,such as lever shaft,plunger.

GB/T 699 20# round bar is in a large need,so we henan KUNFENG stock large quantity of forged bars in the warehouse, and various size round bars included. So if you need GB/T 699 20# round bar, pls be free to contact us.

GB/T 699 20# 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 .

s chemical composition by %,maximum

Grade	C	Si	Mn	P	S	Ni	Cr	Cu
GB/T 699 20#	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.3	≤0.25	≤0.25

s 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 699 20#	Hot rolled, forged, or heat treatment	410	245	25	55	156	≥ 4:1	≥ 6	≤ 2.0