GB 8162 seamless pipe Q345C structural steel tube

Standard: GB/T 8162

GB 8162 seamless pipe Q345C structural steel tube is low alloy high strength steel pipe for structural purposes. Q345C steel is equivalent to EN S355J0. Compared to Q345B steel, the phosphorus and sulfur impurities in Q345C steel is less, which should not exceed 0.030%. That improves its impact toughness. The impact test of GB 8162 Q345C structural steel tube is done at 0℃, and the impact energy is 34J and above.

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GB 8162 seamless pipe Q345C structural steel tube chemical composition:

GB 8162

Q345C

≤0.20

1.7

≤0.50

≤0.030

≤0.15

≤0.07

≤0.20

　≤0.30

　≤0.50

≤0.20

≤0.012

≤0.10

≥0.015

GB 8162 seamless pipe Q345C structural steel tube mechanical properties:

GB 8162	Yield Strength Min			Tensile Strength	Elongation
Q345C	WT≤16	WT>16-30	WT>30
Q345C	345 Mpa	325 Mpa	295 Mpa	470-630 Mpa	20%

Wall thickness tolerance of GB 8162 seamless pipe Q345C structural steel tube:
The wall thickness tolerance of GB 8162 seamless pipe Q345C structural steel tube 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

The diameter tolerance of hot-finished GB 8162 seamless pipe Q345C structural steel tube:
±1%OD or ±0.50mm, choose the larger.

For GB 8162 seamless pipe Q345C structural steel tube, if the nominal outer diameter > 22mm-600mm and ratio of wall thickness to outer diameter no more than 10%, it shall do flattening test.

The technical requirements, test methods, inspection rules, packaging, marks and quality certificates and so on details of GB 8162 seamless pipe Q345C structural steel tube need to comply with GB 8162 specification.

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