GB/T 699 30# round bar

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11-May-2024

GB/T 699 30# carbon steel is a low carbon steel at chinese standard. GB/T 699 30# carbon steel, usually needs to do normalizing treatment, or quenching and tempering treatment, to get good properties and machinability.

For GB/T 699 30# carbon steel,we henan KUNFENG can offer forged round bars OD 80 mm - 1200 mm. GB/T 699 30# 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. If you have any need on GB/T 699 30# round bar, please do not hesitate to contact us.

According to its properties, GB/T 699 30# round bar is often used to produce parts which bear small load and works under 150°C with small section,such as straining beam, guide screw,shaft of chemical machinary industry and so on. 30# round bar can also be applied to manufacture some carburization parts and carbonitriding parts.

s 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 30#	0.27-0.34	0.17-0.37	0.5-0.8	≤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 30#	Hot rolled, forged, or heat treatment	490	295	21	50	179	≥ 4:1	≥ 6	≤ 2.0