Products Description
Q355GNH weathering steel pipe refers to a low-alloy structural steel with a protective rust layer resistant to atmospheric corrosion. Q355GNH steel can be used to manufacture steel structures such as vehicles, bridges, towers, and containers.
Compared with plain carbon steel, weathering steel has better corrosion resistance in the atmosphere - tests show that its corrosion rate is 5–8 times lower and its service life is 2–4 times longer than ordinary carbon steel under outdoor exposure conditions.
Compared with stainless steel, weathering steel has only a small amount of alloying elements, such as phosphorus (0.04–0.12%), copper (0.20–0.50%), chromium (0.30–1.25%), nickel (≤0.65%), molybdenum, niobium, vanadium, titanium, etc.
The total amount of alloying elements is only less than 2%, not like stainless steel, which can reach 10–20%, so the price of Q355GNH steel is relatively low.
The mechanical properties of Q355GNH steel are also excellent: it has a yield strength of ≥355 MPa, tensile strength of 470–630 MPa, and elongation of ≥20% (for plates ≤16 mm thick). In impact tests at room temperature, it achieves Charpy impact energy ≥34 J, showing good toughness and reliability for long-term structural use.
Products features
1. High strength: The yield strength of Q355GNH steel can reach more than 355MPa, and the tensile strength is 470-630MPa, which can meet the strength requirements of most engineering structures.
2. Good welding performance: The carbon equivalent of Q355GNH straight seam welded steel pipe is low, it is not easy to crack during welding, and the performance of the welded joint is stable.
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.
Q355GNH straight seam welded steel pipe, as a high-performance structural steel welded pipe, plays an important role in construction, bridges, machinery manufacturing, and other fields.
By understanding its characteristics, production process, application fields, and purchase precautions, users can better choose and use Q355GNH straight seam welded steel pipe to ensure project quality and safety.
With the advancement of technology and the development of the market, the application prospects of Q355GNH straight seam welded steel pipe will be broader.
