GB/T 699 25# round bar

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11-May-2024

GB/T 699 25# carbon steel is a low carbon steel at chinese standard. Compared with GB/T 699 20# carbon steel, 25# has higher strength. Generally speaking, s is used after normalizing treatment, to guarantee the good properties.

For GB/T 699 25# carbon steel,we henan KUNFENG can offer forged round bars OD 80 mm - 1200 mm. GB/T 699 25# 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 25# round bar, pls be free to contact us.

According to its properties, GB/T 699 25# round bar can be used for producing welded structural parts, and some parts which are treated by forged,hot punching and machine work and bear small load,such as roller,shaft,coupler etc. For cars or tractors, GB/T 699 25# round bar can be produced to crossbeam,frame. Besides, 25# round bar are also available for manufacturing 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 25#	0.22-0.29	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 25#	Hot rolled, forged, or heat treatment	450	275	23	50	170	≥ 4:1	≥ 6	≤ 2.0