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]
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 | C | Mn | Si | P | S | V | Nb | Ti | Cr | Ni | Cu | N | Mo | B | Al |
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 | ||
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%.
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PRODUCT
Contact
- Henan BEBON Iron&Steel co., ltd.
- 0086-371-86151827
- 0086-371-86011881
- [email protected]
- Online Consultation
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