Detailed introduction of Q355GNH weather resistant structural steel

Q355GNH weathering steel basic definition

Q355GNH is weathering resistant steel, that is, atmospheric corrosion resistant steel, is a low alloy steel series between ordinary steel and stainless steel. This kind of steel is made of ordinary carbon steel by adding a small amount of corrosion resistant elements such as copper and nickel to improve its atmospheric corrosion resistance.

Q355GNH weathering tempering chemical composition and mechanical properties

The specific chemical composition range is as follows:
Carbon (C) : ≤0.12%

Silicon (Si) : 0.20~0.75%

Manganese (Mn) : ≤1.00%

Phosphorus (P) : 0.07~0.15%

Sulfur (S) : ≤0.020%

Copper (Cu) : 0.25~0.55%

Nickel (Ni) : ≤0.65%

Molybdenum (Mo) : ≤0.30%

Chromium (Cr) : 0.30~1.25%

Titanium (Ti) : ≤0.10%

Vanadium (V) : ≤0.12%

Niobium (Nb) : 0.015~0.060%

Mechanical properties: Q355GNH has excellent mechanical properties, its tensile strength ≥510~670MPa, yield strength ≥355MPa, elongation ≥19%.

Q355GNH weathering steel characteristics and advantages

Weather resistance: The weather resistance of Q355GNH is 2 to 8 times that of ordinary carbon steel, and it can maintain excellent corrosion resistance in harsh atmospheric environment for a long time.

Coating property: Its coating property is 1.5 to 10 times that of ordinary carbon steel, which is easy to paint and further improve its corrosion resistance.

Strength and toughness: Q355GNH has the strength and toughness of high-quality steel, and can withstand large external forces without deformation or fracture.

Plastic ductility: The steel has good plastic ductility and is easy to be processed and formed in various shapes.

Welding-cutting performance: excellent welding and cutting performance, can carry out a variety of welding and cutting operations, suitable for a variety of complex structural parts manufacturing.

Q355GNH weathering steel application field

Q355GNH is widely used in various fields due to its excellent corrosion resistance and mechanical properties:

Railway vehicles: Used to manufacture the structural parts and components of railway vehicles to ensure their long-term stable operation in harsh environments.

Bridge engineering: Suitable for making Bridges under all kinds of weather conditions, providing greater load bearing capacity and longer service life.

Harbour building: Used to manufacture steel structural parts and components in harbour buildings, such as wharves, trestles, etc.

Oil production platform: In oil production platform, Q355GNH is used to manufacture structural parts such as containers containing hydrogen sulfide corrosive media.

Chemical petroleum equipment: also suitable for the manufacture of chemical petroleum equipment containing hydrogen sulfide corrosion medium containers and other structural parts.