GB 8162 SMLS structural steel tube Q345E seamless pipe

Standard: GB/T 8162

The structural use Q345E seamless pipe is produced according to GB 8162 technical standard, which has detailed limitation for the size, shape, weight, technical requirements, test methods and so on requirements for qualified Q345E structural steel pipe. The impact test temperature of Q345E seamless pipe is -40℃, and the min. impact energy is 27J. So Q345E seamless pipe can perform well in low temperature working environment.

GB 8162 SMLS structural steel tube Q345E seamless pipe chemical composition:

GB 8162

Q345D

≤0.18

1.70

≤0.50

≤0.025

≤0.020

≤0.15

≤0.07

≤0.20

　≤0.30

　≤0.50

≤0.20

≤0.012

≤0.10

≥0.015

GB 8162 SMLS structural steel tube Q345E seamless pipe mechanical properties:

GB 8162	Yield Strength Min			Tensile Strength	Elongation
Q345D	WT≤16	WT>16-30	WT>30
Q345D	345 Mpa	325 Mpa	295 Mpa	470-630 Mpa	20%

The diameter tolerance of hot-finished GB 8162 SMLS structural steel tube Q345E seamless pipe:
±1%OD or ±0.50mm, depending on the larger.

Wall thickness tolerance of hot-finished GB 8162 SMLS structural steel tube Q345E seamless pipe:

If both the supplier and buyer agree, the wall thickness tolerance of GB 8162 SMLS structural steel tube Q345E seamless pipe can also be made by negotiation.

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

It is worth mentioning that the phosphorus content of GB 8162 Q345E seamless pipe is ≤0.025 and sulfur content ≤0.025. It is known that the more phosphorus and sulfur impurities in steel, the worse the impact toughness. With the low content of phosphorus and sulfur, GB 8162 Q345E seamless pipe gets good impact toughness at low temperature.

Meanwhile, GB 8162 Q345E seamless pipe contains micro alloy elements, which help Q345E steel pipe obtain certain corrosion resistance. GB 8162 SMLS structural steel tube Q345E seamless pipe plays an important role in the structural applications.

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