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Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes except round pipes. According to the different cross-sectional shape and size of the steel pipe, it can be divided into special-shaped seamless steel pipes with equal wall thickness (codenamed D), special-shaped seamless steel pipes with unequal wall thickness (codenamed BD), and variable-diameter special-shaped seamless steel pipes (codenamed BJ).
1. Q345B steel pipe is made of high-quality alloy materials and undergoes special treatment processes to have excellent corrosion resistance.2. Q345B steel pipe has high corrosion resistance in harsh environments and can withstand the erosion of chemicals, seawater and other corrosive media.3. The inner wall of Q345B steel pipe is smooth and clean, and is not prone to scaling and corrosion, ensuring the fluid transportation efficiency and stability of the pipeline.4. Q345B steel pipe has high strength and hardness, can withstand high pressure and heavy load, and is widely used in industrial fields.5. Q345B steel pipe has good toughness and can maintain good mechanical properties under extreme temperature conditions, and is suitable for low and high temperature environments.6. Q345B steel pipe has good wear resistance and impact resistance, and is suitable for pipes transporting hard granular materials.composition | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
Q195 | ≤0.12 | ≤0.3 | ≤0.5 | ≤0.035 | ≤0.04 | ≤0.3 | ≤0.3 | ≤0.3 | - |
Q235 | ≤0.22 | ≤0.35 | ≤1.4 | ≤0.045 | ≤0.5 | ≤0.3 | ≤0.3 | ≤0.3 | - |
Q345 | ≤0.2 | ≤0.5 | ≤17 | ≤.035 | ≤0.0335 | ≤0.3 | ≤0.5 | ≤0.3 | - |
Q390 | ≤0.2 | ≤0.5 | ≤1.7 | ≤0.035 | ≤0.035 | ≤0.3 | ≤0.5 | ≤0.3 | ≤0.1 |
10# | 0.07-0.13 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.03 | ≤0.15 | ≤0.3 | ≤0.3 | - |
15# | 0.12-0.18 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.03 | ≤0.2 | ≤0.3 | ≤0.25 | - |
20# | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | - |
25# | 0.22-0.29 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | - |
30# | 0.27-0.34 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | - |
35# | ≤0.17 | ≤0.35 | ≤1.4 | ≤0.04 | ≤0.04 | ≤0.3 | ≤0.3 | ≤0.3 | - |
composition | C | Si | Mn | P | S | Cr |
Q195 | ≤0.12 | ≤0.3 | ≤0.5 | ≤0.035 | ≤0.04 | ≤0.3 |
Q235 | ≤0.22 | ≤0.35 | ≤1.4 | ≤0.045 | ≤0.5 | ≤0.3 |
Q345 | ≤0.2 | ≤0.5 | ≤17 | ≤.035 | ≤0.0335 | ≤0.3 |
Q390 | ≤0.2 | ≤0.5 | ≤1.7 | ≤0.035 | ≤0.035 | ≤0.3 |
10# | 0.07-0.13 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.03 | ≤0.15 |
15# | 0.12-0.18 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.03 | ≤0.2 |
20# | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.035 | ≤0.25 |
25# | 0.22-0.29 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | ≤0.25 |
30# | 0.27-0.34 | 0.17-0.37 | 0.5-0.8 | ≤0.035 | ≤0.035 | ≤0.25 |
35# | ≤0.17 | ≤0.35 | ≤1.4 | ≤0.04 | ≤0.04 | ≤0.3 |
| Thick wall square & rectangular tube specification table | |||||
| Name of product | Size | Wall thickness | Name of product | Size | Wall thickness |
| Square tubes | 20*20 | 1.3-2.5 | Rectangular tubes |
20*30 | 1.3-2.75 |
| 25*25 | 1.3-2.75 | 20*40 | 1.3-2.75 | ||
| 30*30 | 1.3-2.75 | 25*40 | 1.3-2.75 | ||
| 40*40 | 1.3-3.75 | 30*50 | 1.3-4.75 | ||
| 50*50 | 1.3-5.75 | 30*60 | 1.3-4.75 | ||
| 60*60 | 1.3-5.75 | 40*50 | 1.3-4.75 | ||
| 70*70 | 1.3-5.75 | 40*80 | 1.3-4.75 | ||
| 80*80 | 1.3-5.75 | 50*70 | 1.3-4.75 | ||
| 90*90 | 1.3-5.75 | 50*80 | 1.3-4.75 | ||
| 100*100 | 1.5-12 | 60*90 | 1.3-4.75 | ||
| 120*120 | 2.5-12 | 50*100 | 1.3-5.75 | ||
| 140*140 | 2.75-16 | 50*150 | 1.3-5.75 | ||
| 150*150 | 2.75-16 | 60*160 | 1.3-5.75 | ||
| 160*160 | 3.0-16 | 100*150 | 2.5-16 | ||
| 180*180 | 3.0-16 | 100*200 | 2 5-16 | ||
| 200*200 | 3 0-16 | 100*250 | 2.5-16 | ||
| 250*250 | 4.75-20 | 150*300 | 4.5-16 | ||
| 300*300 | 4.75-20 | 200*300 | 5.5-20 | ||
| 400*400 | 4.75-20 | 200*400 | 5.5-20 | ||
| 500*500 | 4.75-20 | 400*600 | 5.5-20 | ||
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