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Chemical and strength properties of Q355GNH high weathering steel plate

Q355GNH is weathering steel, that is, atmospheric corrosion-resistant steel. It 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 corrosion-resistant elements such as copper and nickel. It has the characteristics of high-quality steel. Strength and toughness, plastic elongation, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics; high weathering steel, according to the standard, is divided into four grades: Q295GNH, Q355GNH, Q265GNH, Q310GNH; welding weathering steel, according to the standard, is divided into Q235NH, Q295NH, Q355NH, Q415NH, Q460NH, Q500NH, Q550NH seven grades.

Chemical composition of Q355GNH high weathering steel plate:
C : 0.12, Si : 0.2-0.75, Mn : 1.0, P : 0.07-0.15, S : 0.02, Cr : 0.3-1.25, Ni : 0.65, Cu : 0.25-0.55

Tensile yield strength of Q355GNH high weathering steel plate:
Material: Q355GNH
Tensile strength: 490-630Mpa
Yield strength: 345Mpa
Elongation: 19%
180°bending test: d=3a

The characteristics of Q355GNH high weathering steel plate:
1. Rust resistance and corrosion resistance, with 4-8 times higher atmospheric corrosion resistance than ordinary steel.
2. Materials can be recycled, very low-carbon and environmentally friendly.
3. Steel parts can resist corrosion and prolong life, reduce thickness and reduce consumption, save labor and energy.
4. Green and environmentally friendly, no initial coating is required; the use of fire-resistant coatings and fire-resistant cladding can be reduced, thereby reducing pollution, shortening construction period, reducing costs and reducing maintenance.

Q355GNH high weathering steel application:
The weather resistance of Q355GNH high weathering steel is 2~8 times that of ordinary carbon steel, and the coating property is 1.5~10 times that of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance and longevity of components, thinning and consumption reduction, labor saving and energy saving. Weathering steel is mainly used in railways, vehicles, bridges, towers and other steel structures exposed to the atmosphere for a long time. Q355GNH high weathering steel is used to manufacture structural parts such as containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment.

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