National Standards Structural Tube Standard GB/T8162 Application It is used for common structures and mechanical structures. Main Steel Tube Grades 10, 20, 35, 45, 16Mn, 12CrMo, 15CrMo, 12Cr1MoV etc. Chemical Composition

Standard	Grade	Chemical Composition %
		C	Si	Mn	P, S	Cu	Ni	Mo	Cr
GB/T8162	10	0.07-0.14	0.17-0.37	0.35-0.65	≤0.035	≤0.25	≤0.25	/	≤0.15
	20	0.17-0.24	0.17-0.37	0.35-0.65	≤0.035	≤0.25	≤0.25	/	≤0.25
	35	0.32-0.40	0.17-0.37	0.50-0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	45	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	16Mn	0.12-0.20	0.20-0.55	1.20-1.60	≤0.035	≤0.25	≤0.25	/	≤0.25
	12CrMo	0.08-0.15	0.17-0.37	0.40-0.70	≤0.035	≤0.25	≤0.30	0.40-0.55	0.40-0.70
	15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	≤0.035	≤0.25	≤0.30	0.40-0.55	0.80-1.10
	12Cr1MoV	0.08-0.15	0.17-0.37	0.40-0.70	≤0.035	≤0.25	≤0.30	0.25-0.35	0.90-1.20

  Mechanical Properties

Standard	Grade	Mechanical Properties
		Tensile Strength MPa	Yield Strength MPa	Elongation %
GB/T8162	10	≥335	≥205	≥24
	20	≥390	≥245	≥20
	35	≥510	≥305	≥17
	45	≥590	≥335	≥14
	16Mn	≥490	≥325	≥21
	12CrMo	≥410	≥265	≥24
	15CrMo	≥440	≥295	≥22
	12Cr1MoV	≥490	≥245	≥22