Products Description
Q355GNH Straight Seam Welded Steel Pipe is made from Q355GNH steel plates using high-frequency welding or submerged arc welding processes.
Q355GNH steel is a low-alloy high-strength structural steel, and its chemical composition and mechanical properties meet the requirements of the national standard GB/T 1591-2018 "Low-Alloy High-Strength Structural Steel".
This steel has excellent overall properties, including high strength, good plasticity, toughness, and outstanding welding performance.
The main features of Q355GNH straight seam welded steel pipe include:
High Strength: The yield strength of Q355GNH steel can reach 355 MPa or higher, and the tensile strength ranges from 470 to 630 MPa, which can meet the strength requirements of most engineering structures.
Excellent Welding Performance: The carbon equivalent of Q355GNH straight seam welded steel pipe is low, making it resistant to cracking during welding, and the performance of the welded joints is stable.
GB/T4171 Q355GNH weathering steel pipe Chemical Composition
|
Grade |
C |
Si |
Mn |
P | S | Cu | Cr | Ni |
|
Q355GNH |
≤0.12 |
0.20-0.75 |
≤1.00 |
0.07-0.15 | ≤0.020 | 0.25-0.55 | 0.30-1.25 | ≤0.65 |
GB/T4171 Q355GNH weathering steel pipe Mechanical Property
| Grade | Yieldstrength(MPa), min, for T in mm | Tensilestrength(Mpa) | ,Elongation(%) | ||||||
| Q355GNH | ≤16 | >16,≤40 | >40,≤60 | >60 | 490-630 | ≤16 | >16,≤40 | >40,≤60 | >60 |
| 355 | 345 | - | - | 22 | 22 | - | - | ||
Products application
Q355GNH straight seam welded steel pipe is widely used in the following fields due to its excellent performance:
1. Building structure: Used for steel structure frames of large buildings such as high-rise buildings, gymnasiums, exhibition halls, etc., to provide stable support and load-bearing capacity.
2. Bridge engineering: used for bridge trusses, piers, guardrails, and other parts to bear the load of vehicles and pedestrians.
3. Machinery manufacturing: used for the skeleton and supporting structure of equipment such as engineering machinery, agricultural machinery, mining machinery, etc.
4. Shipbuilding: used for structural parts such as decks and bulkheads of ships, with good corrosion resistance and strength.
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