Q235NH weathering steel: An overview of properties, composition and mechanical properties

Q235NH weathering steel concept

Q235NH full name of atmospheric corrosion resistant hot continuous rolled steel, also known as Cowden steel, corrosion resistant steel. It is a low alloy steel series between ordinary steel and stainless steel, by adding a small amount of corrosion resistant elements such as copper and nickel to ordinary carbon steel. This kind of steel belongs to one of the series of steel at the forefront of the world's super steel technology and has a wide range of application prospects.

Q235NH weathering steel features

Strong weather resistance: The weather resistance of Q235NH steel plate is 2 to 8 times that of ordinary carbon steel, and it has rust resistance characteristics, so that the component can resist corrosion and prolong life.

Good coating performance: Its coating performance is 1.5 to 10 times that of ordinary carbon steel, and it can be thinly used, exposed or simplified.

High strength: has a high yield strength and tensile strength, the yield strength is usually more than 235MPa, the tensile strength is higher.

Good plastic ductility: it has good elongation and cold bending performance, and can produce plastic deformation without breaking when stressed.

Energy saving: can reduce maintenance costs, reduce energy consumption.

Q235NH weathering tempering chemical composition

The chemical composition of Q235NH steel plate mainly includes the following elements, and its approximate content range is as follows:

Carbon (C) : ≤0.13%

Manganese (Mn) : 0.20%~0.60%

Silicon (Si) : ≤0.10%~0.40%

Sulfur (S) : ≤0.030%

Phosphorus (P) : ≤0.030%

Copper (Cu) : 0.25%~0.55%

Chromium (Cr) : 0.40%~0.80%

Nickel (Ni) : ≤0.65%

Mechanical properties of Q235NH weathering steel

The mechanical properties of Q235NH steel plate mainly include the following aspects:

Yield strength: When the thickness of the steel plate is less than 16mm, the yield strength is ≥235MPa. This strength value ensures that the steel plate can resist plastic deformation when subjected to external forces.

Tensile strength: Tensile strength is usually higher than yield strength, and the specific value may vary depending on production standards and actual needs.

Elongation: It has a good elongation rate, indicating that the degree of plastic deformation of the steel plate can occur during the drawing process is larger.

Cold bending performance: It can produce plastic deformation without breaking when stressed, and has good cold bending performance.

In summary, Q235NH steel plate with its excellent performance and wide applicability, plays an important role in construction, Bridges, vehicles, containers, power plant chimneys, railway engineering and other fields.