Seamless pipe is a hollow long steel strip with no seams around it. Seamless pipes are produced in more than 5,100 factories of more than 1,850 companies in more than 110 countries around the world, of which oil pipes are produced in more than 260 factories of more than 170 companies in 44 countries.

Seamless stainless steel pipe is a long steel strip of hollow section with no seams around it. Stainless Steel Seamless Pipe

Features of stainless steel seamless pipe:

First of all, the thicker the wall thickness of the product, the more economical and practical. The thinner the wall thickness, the higher the processing cost. Secondly, the process of this product determines its limited performance, and generally the precision of seamless steel pipes is low: uneven wall thickness, low brightness of the inner and outer surfaces of the tube, high fixed-length costs, and pitting and black spots that are not easy to remove on the inner and outer surfaces; third , its detection and shaping are handled offline. Therefore, it shows superiority in high pressure, high strength and mechanical structural materials.

Types of Stainless Steel Tubes:

Rolling methods include hot rolling, hot extrusion and cold drawing (rolling) of stainless steel tubes.

According to the microstructure of stainless steel, it can be divided into semi-ferritic and semi-martensitic stainless steel pipe, martensitic stainless steel pipe, austenitic stainless steel pipe and austenitic iron stainless steel pipe. 3.1. The domestic seamless steel pipe supplied according to the performance of the mechanism, the ordinary carbon steel is manufactured according to the grade A steel of GB/T700-88 (but the sulfur content should not exceed 0.050% and the phosphorus content should not exceed 0.045%), and its mechanical properties should be Comply with the values ​​specified in the GB8162-87 table.

Properties of seamless steel pipes

1. The domestic seamless steel pipe supplied according to the hydraulic test must ensure the hydraulic test specified in the standard.

2. The physical property inspection of imported seamless steel pipes shall be carried out in accordance with the relevant standards stipulated in the contract.

3. Usage 2.1. Seamless pipes are widely used. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel with the largest output, and are mainly used as pipes or structural parts for conveying fluids.

4. According to different uses, it can be divided into three types of supply: a. Supply according to chemical composition and mechanical properties; b. Supply according to mechanical properties; c. Water supply according to hydraulic test. Steel pipes supplied in accordance with Class A and B shall also be hydrostatically tested if used to withstand liquid pressure.

5. Special purpose seamless steel pipe includes seamless steel pipe for boiler, seamless steel pipe for geological use and seamless steel pipe for petroleum.

    type

1. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes according to different production methods.

2. Classified by shape, there are round tubes and special-shaped tubes. In addition to square tubes and rectangular tubes, there are oval tubes, semicircular tubes, triangular tubes, hexagonal tubes, convex tubes, plum blossom tubes, etc.

3. According to different materials, it can be divided into ordinary carbon structure pipe, low alloy structure pipe, high-quality carbon structure pipe, alloy structure pipe, stainless steel pipe, etc.

4. According to special purposes, there are boiler tubes, geological tubes, oil tubes, etc.