Q355GNH High-Strength Weathering Steel for Durable Structural Use

Description: Q355GNH steel is a high weathering structural steel, a low alloy steel series between ordinary steel and stainless steel. Its atmospheric corrosion resistance is improved by adding corrosion resistant elements such as copper, nickel, and chromium. Its nam...

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Q355GNH High-Strength Weathering Steel Description

Q355GNH steel is a high weathering structural steel, a low alloy steel series between ordinary steel and stainless steel. Its atmospheric corrosion resistance is improved by adding corrosion resistant elements such as copper, nickel, and chromium. Its naming follows the national standard GB/T 4171-2008, where "Q" stands for yield strength and "355" stands for the lower limit of yield strength (355 MPa).

Q355GNH high weathering steel has the characteristics of high strength, corrosion resistance, easy processing, toughness, plasticity and ductility, easy forming, easy welding and cutting, high temperature resistance, fatigue resistance, etc. It is widely used in heavy-loaded structures exposed to the atmospheric environment for a long time, such as bridges, vehicles, towers, marine engineering, etc.

According to the standard, high weathering steel is divided into four grades: Q295GNH, Q355GNH, Q265GNH, and Q310GNH; welding weathering steel is divided into seven grades: Q235NH, Q295NH, Q355NH, Q415NH, Q460NH, Q500NH, and Q550NH according to the standard.

Q355GNH High-Strength Weathering Steel Datasheet

Thickness: 1.5mm - 60mm or Customizable
Width: 1000–3000mm or Customizable
Tolerances： ±0.1
Standard：GB/T 4171 (China)
Surface Quality：No significant defects (e.g., cracks, inclusions); meets GB/T 4171 requirements

Q355GNH High-Strength Weathering Steel Chemical composition

Element	Content
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%
Chromium (Cr)	0.30–1.25%
Nickel (Ni)	≤0.65%