GB 8162 seamless tubes 20# structural steel pipe

Standard: GB/T 8162

20# steel is a Chinese high quality carbon structural steel, and it is also known as GB 20 steel. GB 8162 seamless tubes 20# structural steel pipe is seldom quenched. It has no temper brittleness, and high cold deformation plasticity.

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20# steel is a Chinese high quality carbon structural steel, and it is also known as GB 20 steel. GB 8162 seamless tubes 20# structural steel pipe is seldom quenched. It has no temper brittleness, and high cold deformation plasticity. The ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificates of GB 20 structural steel pipe should follow specification of GB 8162 standard. The equivalent steel grades of GB 20 are AISI 1020, JIS S20C, etc.

GB 8162 seamless tubes 20# structural steel pipe chemical composition:

C, %	Mn, %	Si, %	P, %	S, %	Cr, %	Ni, %	Cu, %
0.17-0.23	0.35-0.65	0.17-0.37	0.035 max	0.035 max	0.25 max	0.30 max	0.25 max

GB 8162 seamless tubes 20# structural steel pipe mechanical properties:

Tensile Strength	Yield Strength			Elongation
Tensile Strength	WT≤16mm	16<WT≤30mm	WT>30mm	Elongation
≥410MPa	≥245MPa	≥235MPa	≥225MPa	≥20%

Wall thickness tolerance of GB 8162 seamless tubes:
The wall thickness tolerance of GB 8162 seamless tubes 20# structural steel pipe can also beyond the specification after negotiation between the supplier and buyer.

Hot rolled	Outside Diameter, mm	Tolerance
	OD≤102	±12.5%WT or ±0.40mm, choose the larger
	OD>102, WT/OD≤0.05	±15%WT or ±0.40mm, choose the larger
	OD>102, 0.05<WT/OD≤0.10	±12.5%WT or ±0.40mm, choose the larger
	OD>102, WT/OD>0.10	+12.5%WT, -10%WT
Hot expanded	±15%WT
Cold Drawn (Cold rolled)	Wall thickness, mm	Tolerance
	WT≤3	+15%/-10%WT or ±0.15mm,choose the larger
	WT>3-10	+12.5%WT, -10%WT
	WT>10	±10%WT

The most popular length of GB 8162 seamless tubes 20# structural steel pipe is 3000-12000mm. GB 20 structural steel pipe needs to be done flattening test if the nominal outer diameter > 22mm-600mm and ratio of wall thickness to outer diameter no more than 10%. GB 20 structural steel pipe is applicable for mechanical structure and general engineering structures.

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