Seamless steel pipe is a kind of steel pipes without welds. It is formed by hot rolling or cold drawing, and the process of hot rolling is called hot rolling, which is usually thicker than the wall thickness of cold drawing. It is divided into two types according to material types: structural seamless steel pipe and conveying fluid seamless steel pipe.
The material of seamless steel pipe includes 10#、 20#、 35#、45#、16Mn、27SiMn 、 12CrMo 、 15CrMo 、 13CrMo44、 10CrMo910、 15Mo3 、 20G 、Cr5Mo 、15MnV 、 20MnV、 St35 、 St45 、 St52 、 E355 、25Mn 、 30Mn2、 20Mn2 、15Cr、 30CrMnSiA 、 45CrNiMoVA 、 40MnB 、 45MnMoB 、 25Cr2MoVA. The common material can meet various operating conditions.
Size (mm): 6mm-711mm
Wall thickness (mm): 1mm-120mm
Specifications (mm): (1/8”-72”)
According to the GB/T8162 standard, the weight of seamless steel pipe can be obtained by the outer diameter and wall thickness. Generally, the inner diameter of pipe is called the nominal diameter, and the outer diameter is called the actual diameter. The outer diameter is obtained from the outer diameter plus the wall thickness. As the wall thickness increases, the weight of the seamless steel pipe also increases.
According to the GB/T8162 standard, the length of seamless steel pipe is 6 meters. However, 5.8-meter pipes can also be produced according to customer requirements, but the weight of the 5.8-meter pipe differs from that of the standard length by 1-2 percent.
The applicable pressure of different seamless steel pipes is different. According to different industrial and mining conditions of transportation, there are different required pressure. Generally, the strength of pressure is P≤9.8Mpa, and the strength of pressure is P≤4.8Mpa.
Seamless steel pipe can be used in machinery manufacturing, shipbuilding, engineering construction, petroleum, chemical industry, food containers, electric heating thin wall tubes, containers, baking pipes and other production processes that require light pipes of various materials.
The quality index of seamless steel pipe is mainly divided into chemical composition analysis, organization, mechanical properties and technical requirements. It is very important to ensure that the quality of the steel pipe meets the requirements of the standard. Otherwise it will cause serious harm to the customer.
In order to guarantee the quality of the seamless steel pipes, we need to carry out complete testing on the test report. The tests mainly include hydrostatic testing, tension testing, flattening test, flattening test and so on. These tests are very important for us to get the data to prove the quality of the steel pipe.
Seamless steel pipe has the characteristics of high strength, good comprehensive performance and safety in application. Its weight and maintenance cost are also low, and it can reduce the weight of the structure, reduce energy consumption and environmental pollution, and it is an economic choice for many projects.
