Stainless steel pipe can be divided into two kinds of stainless steel seamless pipe and stainless steel welded pipe. According to the shape of the section, it can be divided into stainless steel pipes and stainless steel special-shaped pipes. The largest amount is stainless steel round steel pipes. Besides, the shape of stainless steel special-shaped steel pipes is mostly square, rectangular, semi-circular, hexagonal, equilateral triangles, octagonal, etc.
If stainless steel needs to withstand the pressure, you will need to do a hydraulic test to measure the quality and performance of the stainless steel pipe pressure, only at the prescribed pressure without leakage, wet pipe or expansion is qualified, but also need to do some stainless steel pipe crimping, flaring and compressed according to the corresponding standard or the buyer test requirements.
The characteristics of stainless steel seamless pipes can be seen from the following aspects. First, chemical analysis of the chemical composition of stainless steel is used to see whether the chemical components conform to the standard requirements. Secondly, the pressure test can be carried out by pressure and water pressure test. The specified pressure value does not keep less than 5 seconds, and does not leak. The conventional supply water pressure test is 2.45MPa. The pressure pressure test was P=0.5MPAa. Corrosion-resistant test is also needed. The corrosion-resistant steel pipe for industrial corrosion is tested according to the standard or the corrosion method of the two sides, and the stainless steel pipe can not appear intergranular corrosion tendency. In the field of process performance testing, flattening, stretching, impact, expansion, hardness, metallography, bending and other experiments are necessary.
Seamless steel pipe is made of steel ingot or solid pipe billet through perforation, and then processed by hot rolling, cold rolling or cold shifting. Therefore, the general seamless steel pipe can be divided into two kinds: hot rolling and cold rolling seamless steel pipe. In addition, the specifications are usually represented by the diameter of the outer diameter of the wall.
The hot-rolled seamless steel pipes include general steel pipes, low and medium pressure boiler pipes, high pressure boiler pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other kinds of steel pipes.
The cold-rolled seamless steel pipes include carbon steel pipes, medium and low pressure boiler pipes, high pressure boiler pipes, alloy steel pipes, stainless steel pipes and oil cracking pipes. There are also carbon thin-walled steel pipes, alloy thin-wall steel pipes, stainless steel thin-walled steel pipes, special-shaped steel pipes, etc.
The hot rolled seamless steel pipe is usually greater than the outer diameter 32mm, wall thickness in 2.5-75mm, cold-rolled seamless steel pipe diameter can be as small as 6mm, the wall thickness can be thin to 0.25mm, thin-walled stainless steel pipe diameter can reach 5mm, the wall thickness is less than 0.25mm, cold-rolled stainless steel pipe precision is higher than that of hot rolling size. With the development of social economy, stainless steel pipe is widely used.
Source: China Stainless Steel Seamless Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)