Atmospheric corrosion resistant structural steel is a series of low-alloy steel between ordinary steel and stainless steel. Atmospheric corrosion resistant steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the properties of high-quality steel such as strength, ductility, forming, welding and cutting, abrasion, high temperature and fatigue resistance. Atmospheric corrosion resistant structural steel is mainly used for steel structures exposed to the atmosphere for a long time, such as railway vehicles, bridges, and towers.
GB/T 4171-2008 atmospheric corrosion resistant steel grades:
Q235NH, Q265GNH, Q295NH, Q295GNH, Q310GNH, Q355NH, Q355GNH, Q415NH, Q460NH
Chemical requirements (%) for GB/T 4171-2008 steel
Grade |
Carbon |
Silicon |
Manganese |
Phosphorous |
Sulfur |
Copper |
Chromium |
Nickel |
|
Q235NH |
≤0.13 |
0.10-0.40 |
0.20-0.60 |
≤0.030 |
≤0.030 |
0.20-0.55 |
0.40-0.80 |
≤0.65 |
|
Q265GNH |
≤0.12 |
0.10-0.40 |
0.20-0.50 |
0.07-0.12 |
≤0.020 |
0.20-0.45 |
0.30-0.65 |
0.25-0.50 |
|
Q295NH |
≤0.15 |
0.10-0.50 |
0.30-1.00 |
≤0.030 |
≤0.030 |
0.25-0.55 |
0.40-0.80 |
≤0.65 |
|
Q295GNH |
≤0.12 |
0.10-0.40 |
0.20-0.50 |
0.07-0.12 |
≤0.020 |
0.25-0.45 |
0.30-0.65 |
0.25-0.50 |
|
Q310GNH |
≤0.12 |
0.20-0.75 |
0.20-0.50 |
0.07-0.12 |
≤0.020 |
0.20-0.50 |
0.30-1.25 |
≤0.65 |
|
Q355NH |
≤0.16 |
≤0.50 |
0.50-1.50 |
≤0.030 |
≤0.030 |
0.25-0.55 |
0.40-0.80 |
≤0.65 |
|
Q355GNH |
≤0.12 |
0.20-0.75 |
≤1.00 |
0.07-0.15 |
≤0.020 |
0.25-0.55 |
0.30-1.25 |
≤0.65 |
|
Q415NH |
≤0.12 |
≤0.65 |
≤1.10 |
≤0.025 |
≤0.030 |
0.25-0.55 |
0.30-1.25 |
0.12-0.65 |
|
Q460NH |
≤0.12 |
≤0.65 |
≤0.15 |
≤0.025 |
≤0.030 |
0.20-0.55 |
0.30-1.25 |
0.12-0.65 |
In recent years, with the development of the container transportation industry, high weathering steel (Q295GNH, Q355GNH) also has a good development prospect in the container field. Containers are often in the open environment and are eroded by rain for many years. Choosing high weathering steel as the basic material can effectively reduce The occurrence of rust.
