Weathering steel, that is, atmospheric corrosion resistant steel, is a low alloy steel series between ordinary steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of copper, nickel and other corrosion resistant elements. It has the characteristics of high quality steel, such as strength, plastic casting, forming, welding, abrasion, high temperature and fatigue resistance.The weatherability is 2~8 times that of normal carbon steel, and the coating ability is 1.5~10 times that of normal carbon steel.At the same time, it has the characteristics of rust resistance, corrosion resistance, life extension, thinning and energy saving.Weathering steel is mainly used in railway, vehicles, Bridges, towers, photovoltaic, high-speed engineering and other steel structures exposed to the atmosphere for a long time.Used for manufacturing containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers containing corrosive medium of hydrogen sulfide in chemical and petroleum equipment.
The characteristics of weathering steel include: C: ≤0.12, Si: 0.25 ~ 0.75, Mn: 0.2 ~ 0.5, S: 0.02 ~0.12, P: 0.06~0.12, Cu: 0.25 ~ 0.5, Cr: 0.3~1.25, Ni: 0.12~0.65, the rest are Fe and trace elements.By alloying Cu, Mn, Si, Al and other elements and simply adjusting the content of ordinary low carbon steel (Q235 steel), the economic weathering steel with good atmospheric corrosion resistance and comprehensive mechanical properties can be produced without changing the production process of Q235 steel.Weathering steel (atmospheric corrosion resistant steel) can be sustainably developed and innovated after being integrated with new mechanism, new technology and new process of modern metallurgy. It is one of the series of steel at the forefront of super steel technology in the world.Weathering steel is made of common carbon steel by adding a small amount of copper, nickel and other corrosion resistant elements. It has the characteristics of high quality steel, such as strength, plastic casting, forming, welding and cutting, abrasion, high temperature and fatigue.The weatherability is 2~8 times of common carbon steel, the coating ability is 1.5~10 times of common carbon steel, can reduce the use of thin, exposed use or simplify the use of coating.The steel has the characteristics of rust resistance, corrosion resistance, life extension, thinning and energy saving, benefiting component manufacturers and users.Weathering steel products for the manufacture of containers, railway vehicles, oil derricks, harbour buildings, oil platforms and chemical and petroleum equipment containing hydrogen sulphide corrosive medium containers and other structural parts.
After the addition of trace elements such as phosphorus, copper, chromium and nickel into the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the diffusion and development of rust and protects the substrate below the rust layer to slow down its corrosion rate.In rust is formed between the layer and the substrate of about 50 microns to 100 microns thick amorphous spinel and dense oxide layer and substrate metal stick fine, because of the existence of the oxide film layer prevents the oxygen in the atmosphere and water infiltration to the steel matrix, and slow down the corrosion to steel material depth development, greatly improve the atmospheric corrosion resisting capacity of steel materials.Weathering steel is a kind of steel that can be used thiningly, exposed or simply painted to resist corrosion, prolong life, save labor and reduce consumption, and upgrade. It is also a kind of steel that can be integrated into new mechanism, new technology and new process of modern metallurgy to make its sustainable development and innovation.
Weathering steel Weathering steel manufacturing process weathering steel generally adopts the process routes such as concentrate in furnace - smelting (converter, electric furnace - microalloying treatment - blowing argon -LF refining - low superheat continuous casting (feeding rare earth wire)- controlled rolling and cooling.During smelting, the waste steel is added into the furnace together with the charge, and the steel is smelted according to the conventional process. Deoxidizer and alloy are added after the steel is produced. After argon blowing, the molten steel is then cast, and the molten steel after argon blowing and temperature adjustment is cast into slab by continuous casting machine.Due to the addition of rare earth elements in steel, weathering steel is purified and the inclusion content is greatly reduced.
Weathering steel using the engineering example,
high-performance weathering steel and refractory steel can reduce steel structure maintenance, in order to solve the leakage of unprotected steel structure fire retardant anticorrosion problem provides a new solution, such as high voltage tower 2, the production of refractory weathering steel installation process and conventional steel basic same, also the same as the ordinary steel structure design method, but need more test three, high strength weathering steel has been applied in bridge engineering, need to study design theories and methods of four, refractory weathering steel can also be applied to LouCheng board.
Email: annie@AHL Steel .com, Tel: +86 0372 5363205
