Weathering steel overview
The weathering steel is characterized in that the alloy composition and the weight percentage content of the weathering steel are: C: 0.12 to 0.21, Si: 0.2 to 2.0, Mn: 0.7 to 2.0, S ≤ 0.036, P ≤ 0.034, Cu: 0.10 to 0.40, Al. <0.2, the rest are Fe and trace impurities. By alloying Cu, Mn, Si, Al, etc., and simply adjusting the partial element content of ordinary low carbon steel (Q235 steel), it can produce good atmospheric corrosion resistance without changing the production process conditions of Q235 steel. Economic weathering steel with comprehensive mechanical properties.
Weathering steel (ie, atmospheric corrosion resistant steel) is one of the series of steel grades at the forefront of the world's super steel technology after being integrated into modern metallurgical new mechanisms, new technologies and new processes. Weathering steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the characteristics of high-quality steel such as toughness, plastic elongation, forming, welding, abrasion, high temperature and fatigue. The weather resistance is 2~ of carbon steel. 8 times, the coating is 1.5 to 10 times that of ordinary carbon steel, which can be used for thinning, bare use or simplified painting. The steel grade has the characteristics of rust resistance, corrosion resistance, longevity, thinning and reducing consumption, saving labor and energy, and benefiting component manufacturers and users. At present, the elite talents who manufacture this kind of steel are also the most scarce in China. At present, there are many steel talents in the weathering steel. Weathering steel products are used to manufacture structural parts such as containers for containers containing hydrogen sulfide and corrosive media in containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and chemical petroleum equipment.
Weathering steel characteristics
It refers to a low-alloy structural steel with a protective rust layer resistant to atmospheric corrosion and 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. Compared with stainless steel, weathering steel has only a small amount of alloying elements, such as phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, etc., the total amount of alloying elements is only a few percent, not like stainless steel, reaching 100 More than a dozen, so the price is relatively low.
Weathering steel principle
After adding trace elements such as phosphorus, copper, chromium and nickel to the steel, the surface of the steel is formed into a dense and highly protective film, which hinders the diffusion and development of the rust, and protects the substrate under the rust layer to slow down the corrosion rate. The amorphous spinel-type oxide layer formed between the rust layer and the substrate is dense and has good adhesion to the base metal. Due to the presence of the dense oxide film, oxygen in the atmosphere is prevented. The infiltration of water into the steel matrix slows down the development of rust to the steel material and greatly improves the atmospheric corrosion resistance of the steel material. Weathering steel is a steel system that can be used for thinning, bare use or simplified painting, so that the product can resist corrosion, save labor, and upgrade. It is also a new mechanism, new technology and new technology that can be integrated into modern metallurgy. Sustainable development and innovative steel systems.
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