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Q345 seamless alloy steel pipe
(1)Normal size:
| sizes | outer diameter(mm) | thickness(mm) | tolerance(mm) | length(m) |
| round pipe | 20-273 | 0.3-50 | ±0.3 | 3,6,8,12,etc |
| rectangular pipe | 20*30-150*250 | 0.3-12 | ±0.3 | 3,6,8,12,etc |
| square pipe | 20*20-200*200 | 0.3-12 | ±0.3 | 3,6,8,12,etc |
(2) Chemical element:
| Grade | C | Si | Mn | P | S | Al |
| Q345A | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | Al≥0.015 |
| Q345B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 | Al≥0.015 |
| Q345C | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.030 | ≤0.030 | Al≥0.015 |
| Q345D | ≤0.18 | ≤0.50 | ≤1.70 | ≤0.030 | ≤0.025 | Al≥0.015 |
| Q345E | ≤0.18 | ≤0.50 | ≤1.70 | P≤0.025 | ≤0.020 | Al≥0.015 |
| Grade | Ti | Cr | Ni | Mo | Nb | V |
| Q345A | ≤0.20 | ≤0.30 | ≤0.012 | ≤0.10 | ≤0.07 | ≤0.15 |
| Q345B | ≤0.20 | ≤0.30 | ≤0.012 | ≤0.10 | ≤0.07 | ≤0.15 |
| Q345C | ≤0.20 | ≤0.30 | ≤0.012 | ≤0.10 | ≤0.07 | ≤0.15 |
| Q345D | ≤0.20 | ≤0.30 | ≤0.012 | ≤0.10 | ≤0.07 | ≤0.15 |
| Q345E | ≤0.20 | ≤0.30 | ≤0.012 | ≤0.10 | ≤0.07 | ≤0.15 |
(3) Mechanical properties
| Annealing hardness | Cold pull hardness | Preheating temperature | Quenching temperature | Holding time | Hardening medium | Temper temperature | After tempering hardness | |
| HBS | HBS | ℃ | ℃ | min | ℃ | ≥HRC | ||
| salt-bath furnace | controlled atmosphere furnace | |||||||
| 235 | 262 | 788 | 1191 | 1204 | 5~15 | air cooling | 522 | 60 |
Application
(1) For liquid transportation:water supply,water drainage,sewage treatment,engineering,transmission of mud,sea water.
(2) For gas:gas,steam,liquefied petroleum gas.
(3) For structure:piling pipe,bridge,Dock,road,building structure pipe,Marine piling pipe.
Company Information
Operation Philosophy
Create value for customers, and achieve a win-win situation.
Corporation values
Integrity, innovation, team work and high-quality.
Contact Person: Sam
Tel: +8613031891590
