High strength low alloy GB 8162 Q345B structural steel seamless pipe

Standard: GB/T 8162

GB 8162 Q345B structural steel seamless pipe is high strength low alloy steel with wide application. The Q345B steel pipe needs to do impact test at +20℃ temperature, and the impact energy should be 34J and above. The diameter tolerance for hot-finished GB 8162 Q345B structural steel seamless pipe is ±1%OD or ±0.50mm, depending on the the larger.

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High strength low alloy GB 8162 Q345B structural steel seamless pipe chemical composition:

GB 8162

Q345B

≤0.20

1.7

≤0.50

≤0.035

　≤0.30

　≤0.50

≤0.20

≤0.012

≤0.10

≥-

High strength low alloy GB 8162 Q345B structural steel seamless pipe mechanical properties:

GB 8162	Yield Strength Min			Tensile Strength	Elongation
Q345B	WT≤16	WT>16-30	WT>30
Q345B	345 Mpa	325 Mpa	295 Mpa	470-630 Mpa	20%

Wall thickness tolerance of GB 8162 Q345B structural steel seamless pipe:
GB 8162 Q345B structural steel seamless pipe is always hot-finished. The wall thickness tolerance of GB 8162 Q345B steel pipe can be different from below 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

GB 8162 standard has clear stipulation for the ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificates of Q345B structural steel seamless pipe, the Q345B structural steel pipe manufacture should follow the terms. The flattening test should be conducted for GB 8162 Q345B seamless pipe if the nominal outer diameter > 22mm-600mm and ratio of wall thickness to outer diameter no more than 10%.

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