Rectangular Pipe Detailed explanation of three characteristics

(1) Large size

The product specification of the square rectangular steel pipe consumer line of the large specification thick wall square rectangular steel pipe process is 400 * 400 * 20mm-600mm * 600mm * 30mm.    

(2) High strength

In order to reduce deadweight and improve safety performance such as earthquake resistance and impact resistance, high-strength steel has been widely used at home and abroad, and the strength limit has reached 630MPa or higher. The tensile strength of the base material of the square and rectangular pipes consumed by the large specification thick wall cold bending square and rectangular steel pipe process can reach 630Mpa. According to the strength grade of the product, the strength of the product of Nippon Steel's consumer line is only 550Mpa, and the difference between the two is close to 15.

(3) Super thick product

The thickness of square and rectangular tubes consumed by the process of large size thick wall cold bending square and rectangular tubes is up to 19 mm. The extra thickness is not only reflected in the thickness, but also in the relative thickness of the products. The thickness is an important indicator of the difficulty of cold bending, and the square tube is expressed by the edge thickness ratio. At present, it is generally believed at home and abroad that when the edge thickness ratio is lower than 10, the product has high molding difficulty. For square and rectangular pipes consumed by the process, the edge thickness ratio of products with small section and large wall thickness can reach 7, such as 100mm * 100mm * 14mm, 120mm * 120mm * 16mm, etc.

1. Manufacturing method:

① The operating temperature of ordinary boiler tubes is below 450 ℃, and domestic tubes are mainly made of No. 10 and No. 20 carbon steel hot-rolled tubes or cold drawn tubes.

② High pressure boiler tubes are often in high temperature and high pressure conditions when they are used. Under the action of high-temperature flue gas and water vapor, the tubes will be oxidized and corroded. The steel pipe is required to have high durability, high oxidation and corrosion resistance, and good organizational stability.

2. Use:

① Ordinary boiler tubes are mainly used to manufacture water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes, arch brick tubes, etc.

② High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam pipes, etc. of high-pressure and ultra-high pressure boilers.

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