The difference between weathering steel plate and ordinary steel plate

1. Steel composition

• Ordinary steel plate: mainly composed of iron and carbon, carbon content is relatively high, may also contain a small amount of manganese, silicon and other elements. The combination of these elements determines the basic properties of ordinary steel plates, such as a certain strength and toughness, but the tolerance is relatively weak in special environments.

• Weather-resistant steel plate: A small amount of copper, nickel, chromium, titanium, molybdenum and other alloying elements are added on the basis of ordinary carbon steel. The addition of these alloying elements enables the weather-resistant steel plate to form a dense oxide film in the air, preventing the internal metal from being further oxidized and corroded, and greatly improving its atmospheric corrosion resistance.

2.Second, performance characteristics

• Corrosion resistance:

• Ordinary steel plate: easy to rust in the atmospheric environment, and the rust layer can not play a protective role, rust will continue to penetrate into the interior, resulting in the structure of the steel plate is gradually destroyed, reducing its service life. If it is in a harsh environment such as humidity, acid and alkali, the corrosion rate will be faster.

• Weather-resistant steel plate: has good atmospheric corrosion resistance, exposed to the natural environment, after a period of time, the surface will form a stable layer of rust layer, this layer of rust layer not only will not cause damage to the steel plate, but like a protective film, prevent further intrusion of corrosive media, making the service life of weather-resistant steel plate greatly extended.

• Strength and toughness:

• Ordinary steel plate: has a certain strength and toughness, can meet the needs of general building structure and mechanical manufacturing. However, in the overall performance of strength and toughness, it may not be as good as some specially treated steels.

• Weather-resistant steel plate: After adding alloying elements, it not only maintains the strength of ordinary steel plates, but also performs better in toughness, plastic ductility, fatigue strength, etc. This makes the weather-resistant steel plate have better resistance when it is subjected to large loads, vibration or impact, and it is not easy to break or deformation.

• Welding performance:

• Ordinary steel plate: the welding performance is relatively good, the welding process is not easy to crack and other defects, suitable for using a variety of conventional welding methods to connect.

• Weather-resistant steel plate: Due to the influence of alloying elements, its welding performance may be affected to a certain extent. When welding, it is necessary to select the appropriate welding materials and processes to ensure the quality and performance of the welded joint.

3. Iii. Use

• Ordinary steel plate: widely used in construction, machinery manufacturing, automobile manufacturing, container manufacturing and other fields. For example, in the field of construction, ordinary steel plates can be used to build the frame, floor and other structures of the house; In the field of mechanical manufacturing, it can be used to manufacture various parts, such as gears, shafts, etc.

• Weatherproof steel plate: mainly used in places with high corrosion resistance requirements, such as Bridges, railway vehicles, containers, oil derricks, port buildings, oil platforms and containers containing hydrogen sulfide corrosive media in chemical and petroleum equipment. In landscape design, curtain wall design, architectural design and other fields are also increasingly favored, because its unique rust red appearance can add a unique artistic atmosphere to the building.