GB 8162 structural tubes 45# carbon steel seamless pipe

Standard: GB/T 8162

GB 8162 structural tubes 45# carbon steel seamless pipe is a common medium carbon steel. 45# steel is also know as GB 45 steel. It is equivalent to AISI 1045, JIS S45C. GB 45 carbon steel seamless pipe should be quenched and tempered for small parts, and normalized for large parts.

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GB 8162 structural tubes 45# carbon steel seamless pipe is a common medium carbon steel. 45# steel is also know as GB 45 steel. It is equivalent to AISI 1045, JIS S45C. GB 45 carbon steel seamless pipe should be quenched and tempered for small parts, and normalized for large parts.

GB 8162 structural tubes 45# carbon steel seamless pipe is applicable for mechanical structure and general engineering structures. And it is usually supplied with 3000-12000mm length or other customized size.

GB 8162 structural tubes 45# carbon steel seamless pipe chemical composition:

C, %	Mn, %	Si, %	P, %	S, %	Cr, %	Ni, %	Cu, %
0.42-0.50	0.50-0.80	0.17-0.37	0.035 max	0.035 max	0.25 max	0.30 max	0.25 max

GB 8162 structural tubes 45# carbon steel seamless pipe mechanical properties:

Grade	Yield Strength (Mpa)			Tensile Strength (MPa)	Elongation (%)
45#	≤16mm	＞16mm-30mm	≥30mm	≥590	≥14
	≥335	≥325	≥315

Wall thickness tolerance of GB 8162 carbon steel seamless pipe:
The wall thickness tolerance of GB 8162 structural tubes 45# carbon steel seamless 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

GB 8162 structural tubes 45# carbon steel seamless pipe has good comprehensive mechanical properties after quenching and tempering. And it is widely used as various important structural parts, especially those working under alternating load such as connecting rods, bolts, gears and shafts. But the surface hardness of GB 45 carbon steel seamless pipe is low and not wear-resistant. The surface hardness of GB 45 carbon steel seamless pipe can be improved by quenching and tempering and surface quenching treatment.

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