Weather resistant steel plate detailed interpretation

Weather resistant steel plate detailed interpretation

1. Weather resistant steel plate manufacturing process:

Weathering steel generally adopts the process route of fine feed into furnace - smelting (converter, electric furnace - micro-alloying treatment - argon blowing -LF refining - low superheat continuous casting (feeding rare earth wire)- controlled rolling and controlled cooling. During the smelting process, the scrap steel is added to the furnace with the charge and smelted according to the conventional process. After the steel is produced, the deoxidizer and alloy are added. The molten steel is treated by argon blowing and then cast immediately. Due to the addition of rare earth elements in steel, the weather-resistant steel is purified and the content of inclusions is greatly reduced.

2. Weldability of weatherproof steel plate:

If you use filler metal that is not resistant to atmospheric corrosion, you should ensure that the weld itself is weather-resistant. Prior to welding, the formed surface layer should be removed to a distance of 10mm to 20mm from the edge of the joint. Special precautions should be taken for welding steel grades S355J0WP and S355J2WP with high phosphorus content.

3. Principle of weather-resistant steel plate:

After adding trace elements such as phosphorus, copper, chromium and nickel to the steel, a dense and highly adhesive protective film is formed on the steel surface, which prevents the corrosion from spreading and developing, and protects the matrix below the rust layer to slow down its corrosion rate. The amorphous spinel oxide layer of about 50μm ~ 100μm thickness formed between the rust layer and the matrix is dense and has good adhesion to the matrix metal. Due to the existence of this dense oxide film, the atmospheric oxygen and water are prevented from penetrating into the steel matrix, which slows down the development of corrosion to the steel material, and greatly improves the atmospheric corrosion resistance of the steel material. Weathering steel is a steel system that can be thinned, exposed or simplified for painting, so that products can resist corrosion and prolong life, save labor and reduce consumption, and upgrade, and it is also a steel system that can be integrated into the new mechanism, new technology and new process of modern metallurgy to make its sustainable development and innovation.

4. Engineering examples

First, high-performance weathering steel and refractory steel can reduce the maintenance costs of steel structures, and provide new solutions to solve the fire prevention and corrosion problems of exposed unprotected steel structures, such as high voltage towers.

Second, the production and installation process of fire-resistant weathering steel is basically the same as that of conventional steel, and the design method is the same as that of ordinary steel structure, but more tests are needed to verify.

Third, high-strength weathering steel has been popularized and applied in bridge engineering, and it is necessary to study the design theory and method.

Fourth, fire-resistant weathering steel can also be used in floor bearing plate.

(1) Shanghai Zhongfu high-rise steel structure housing about 5,000 tons

(2) Beijing National Center for the Performing Arts about 300 tons

(3) WisCO Technology Center Building is about 3,000 tons

(4) Beijing Wealth Center, Morgan Center more than 7,000 tons

(5) More than 200 tons of sports and art training base for disabled people in China

Weather resistant steel flower pot

Weathering steel furnace