What is GB/T 4171 Q355NH Weather-resistant steel plate ?

GB/T 4171 Q355NH Weather-resistant steel plate, which is weather-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. GB/T 4171 Q355NH weather-resistant steel plate is added with a small amount of corrosion-resistant elements such as copper and nickel. Cheng, with high-quality steel toughness, plastic extension, molding, welding, abrasion, high temperature, fatigue resistance, etc.; weather resistance is 2 to 8 times that of ordinary carbon steel, coating is 1.5 to 10 times that of ordinary carbon steel . At the same time, it has the characteristics of rust resistance, anti-corrosion and life extension, thinning and reducing consumption, saving labor and energy. GB/T 4171 Q355NH Weathering steel sheets are mainly used for steel structures used for long-term exposure to the atmosphere such as railways, vehicles, bridges, towers, photovoltaics, and high-speed projects. It is used to manufacture structural parts such as containers for containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and chemical petroleum equipment containing hydrogen sulfide corrosion media.

The characteristics are as follows: the alloy composition and the weight percentage of the GB/T 4171 Q355NH weathering steel sheet are: C: ≤ 0.12, Si: 0.25 to 0.75, Mn: 0.2 to 0.5, S ≤ 0.02, P: 0.06 to 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, 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. The economical performance of the comprehensive mechanical performance GB/T 4171 Q355NH weathering steel.

GB/T 4171 Q355NH Weather-resistant steel sheet (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. GB/T 4171 Q355NH Weather-resistant steel plate 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. Carbon steel is 2 to 8 times, and the coating property is 1.5 to 10 times that of ordinary carbon steel. It 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. GB/T 4171 Q355NH Weather-resistant steel plate products are used to manufacture structural parts such as containers for containers containing hydrogen sulfide corrosion in containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and chemical petroleum equipment.

GB/T 4171 Q355NH weathering steel plate generally adopts fine material into furnace-smelting (converter, electric furnace-microalloying treatment-argon-LF refining-low superheat continuous casting (feeding rare earth wire)-controlled rolling and cooling) During smelting, the scrap steel is added into the furnace along with the charge, and is smelted according to the conventional process. After the steel is discharged, the deoxidizer and the alloy are added. After the molten steel is treated by argon blowing, the steel is immediately cast, and the molten steel after the argon temperature adjustment is cast by the continuous casting machine. Slab slab. Due to the addition of rare earth elements in steel, GB/T 4171 Q355NH weathering steel plate is purified and the inclusion content is greatly reduced.
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