First, Q235NHA read as: Q two three five weather resistance A, also known as: atmospheric corrosion resistance hot rolled steel, also known as Cowden steel, corrosion resistant steel, is between ordinary steel and stainless steel low alloy steel. It belongs to one of the world's super steel technology frontier level steel.
Mainly used in containers, power plant chimneys, etc. Is the general board weathering board used in harsh environments, long service life.
With protective rust layer resistant to atmospheric corrosion, can be used in the manufacture of vehicles, Bridges, towers, containers and other steel structures of low alloy structural steel. Compared with ordinary carbon steel, weathering steel has better corrosion resistance in the atmosphere.
Compared with stainless steel, weathering steel has only a small amount of composite elements, such as phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, etc., and the total alloying element accounts for only a few percent, unlike stainless steel, which reaches ten percent, so the price is lower.
2. Q235NHA features:
It has the characteristics of rust resistance, corrosion resistance and life extension, thinning and consumption reduction, labor saving and energy saving. Used in harsh environments, long service life. With protective rust layer resistant to atmospheric corrosion, can be used in the manufacture of vehicles, Bridges, towers, containers and other steel structures of low alloy structural steel. Compared with ordinary carbon steel, weathering steel has better corrosion resistance in the atmosphere. Compared with stainless steel, weathering steel has only a small amount of composite elements, such as phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, etc., and the total alloying element accounts for only a few percent, unlike stainless steel, which reaches ten percent, so the price is lower.
Third, weather-resistant steel plate is used in:
3.1, high-performance weathering steel and fire-resistant steel can reduce the maintenance costs of steel structures, and provide new solutions to solve the fire prevention and corrosion problems of exposed unprotected steel structures, such as high voltage towers
3.2, the production and installation process of fire-resistant weathering steel is basically the same as that of conventional steel, and the design method is the same as that of ordinary steel structure, but more tests are needed to verify
3.3, high strength weathering steel has been applied in bridge engineering, need to study the design theory and method four, fire resistant weathering steel can also be used in the floor bearing plate
Fourth, the production process of weather-resistant steel plate:
Weathering steel generally uses concentrate into the furnace - smelting (converter, electric furnace. Microalloying treatment argon blowing LF refining low superheat continuous casting (feeding rare earth wire) -controlled rolling and controlled cooling process. In the process of smelting, the scrap steel is added into the furnace with the charge and smelted according to the conventional process. After the steel is produced, the deoxidizer and alloy are added. The molten steel is treated by argon blowing and then cast immediately. Due to the addition of rare earth elements in steel, the weather-resistant steel is purified and the content of inclusions is greatly reduced.
5. Widely used in: Containers, power plant chimneys, railway engineering and other outdoor steel such as large outdoor sculpture steel, weathering steel (that is, atmospheric corrosion resistant steel) is between ordinary steel and stainless steel series of cheap and high-quality low alloy steel series, in the integration of modern metallurgy new mechanisms, new technologies and new processes after sustainable development and innovation, is one of the world's super steel technology frontier level of steel series.
