Weathering steel Q355GNH

Weathering steel Q355GNH concept

Weathering steel Q355GNH, also known as atmospheric corrosion resistant steel, 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, it has the characteristics of strength, plastic extension, molding, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics of high-quality steel, while significantly improving weather resistance and corrosion resistance.

 

Chemical composition of weathering steel Q355GNH

 

The main chemical composition and content range of weathering steel Q355GNH are shown in the following table:

 

C (Carbon) ≤0.12 (%)

 

Si (Silicon) 0.20-0.75 (%)

 

Mn (Manganese) ≤1.00 (%)

 

P (P) 0.07-0.15 (%)

 

S (sulfur) ≤0.020 (%)

 

Cu (Copper) 0.25-0.55 (%)

 

Cr (Chromium) 0.30-1.25 (%)

 

Ni (nickel) ≤0.65 (%)

 

Mo (Mo) ≤0.30 (%)

 

Ti (Titanium) ≤0.10 (%)

 

V (V) ≤0.12 (%)

 

Nb (Niobium) 0.015-0.060 (%)

 

Mechanical properties of weathering steel Q355GNH

 

The main mechanical properties of weathering steel Q355GNH include:

 

Yield strength: ≥355 MPa

 

Tensile strength: 490-630 MPa

 

Elongation after fracture (A50) : ≥26%

 

Characteristics of weathering steel Q355GNH

 

The characteristics of weathering steel Q355GNH are mainly reflected in the following aspects:

 

High strength: with high yield strength and tensile strength, it can meet the needs of various engineering structures.

 

Excellent corrosion resistance: The special surface coating (naturally formed rust layer) can effectively resist corrosion factors such as moisture, oxygen and chemicals in the atmosphere, significantly improving the durability of the structure.

 

Good welding performance: easy to weld, and stable and reliable welding quality.

 

Environmental protection: Environmental protection coating is used in the production process to reduce environmental pollution.

 

Beautiful: The surface coating is uniform, the color is beautiful, and the decorative effect is good (refers to the steel plate after specific treatment).

 

Weathering steel Q355GNH application range

 

Weathering steel Q355GNH is favored for its unique properties and a wide range of applications, including:

 

Bridge engineering: As the main structural material of Bridges, it can effectively resist wind and rain erosion and extend the service life of Bridges.

 

Construction engineering: can be used for roof, wall and ground and other parts to improve the durability and safety of the building.

 

Vehicle manufacturing: In the manufacture of vehicles such as cars and trains, the corrosion resistance of vehicles can be effectively improved.

 

Container manufacturing: It has good anti-rust performance and high strength, which can ensure the safe transportation of containers.

 

Other fields: It can also be used in petrochemical, electric power, environmental protection and other fields, as well as railway vehicles, port buildings, oil platforms and chemical and petroleum equipment containing hydrogen sulfide corrosion medium containers and other structural parts.