GB 8162 Q345D seamless steel pipe for structural purposes

Standard: GB/T 8162

GB 8162 Q345D seamless steel pipe is the second most popular Q345 high strength low alloy steel pipes, the first is Q345B steel pipe. Q345D steel is added with the micro alloy elements V, Ti and Nb, which refine the grain, greatly improving the toughness and comprehensive mechanical properties of GB 8162 Q345D seamless steel pipe.

E-mail: [email protected]

Chat Online Leave a message

GB 8162 Q345D seamless steel pipe is the second most popular Q345 high strength low alloy steel pipes, the first is Q345B steel pipe. Q345D steel is added with the micro alloy elements V, Ti and Nb, which refine the grain, greatly improving the toughness and comprehensive mechanical properties of GB 8162 Q345D seamless steel pipe. The chemical composition requirement of GB 8162 Q345D seamless steel pipe is high, and the S content should be controlled within 0.025, so as to guarantee the impact toughness of GB 8162 Q345D seamless steel pipe at low temperature. Q345D steel pipe impact temperature is -20℃, which is the most obvious difference with other Q345 steel grades.

GB 8162 Q345D seamless steel pipe chemical composition:

GB 8162

Q345D

≤0.18

1.7

≤0.50

≤0.030

≤0.025

≤0.15

≤0.07

≤0.20

　≤0.30

　≤0.50

≤0.20

≤0.012

≤0.10

≥0.015

GB 8162 Q345D seamless steel 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 Q345D seamless steel pipe:
±1%OD or ±0.50mm, depending on the larger.

Wall thickness tolerance of hot-finished GB 8162 Q345D seamless steel pipe:
If both the supplier and buyer agree, the wall thickness tolerance of GB 8162 Q345D seamless steel 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

GB 8162 Q345D seamless steel pipe is used for all kinds of structures. The equivalent steel grade of GB Q345D is EN S355J2. GB 8162 Q345D seamless steel pipe will do flattening test if the nominal outer diameter > 22mm-600mm, wall thickness - outer diameter ratio ≤10%.

[Back]

Pre: GB 8162 seamless pipe Q345C structural steel tube

Next: GB 8162 SMLS structural steel tube Q345E seamless pipe