In the application of thin-walled stainless steel pipe, indoor gas pipeline is an important application area. Indoor gas and stainless steel pipes need to bear certain pressure to prevent explosion and fire caused by gas leakage, so as to avoid loss of personnel and property.
Therefore, the minimum requirement for indoor gas and stainless steel pipe is to have enough mechanical strength, excellent connection performance and air tight.
To meet the basic requirements of these gas pipeline materials, we need to select materials from the following aspects.
First, from the strength performance of stainless steel pipe, the strength performance of the pipe material should be analyzed from several parameters, such as the tensile strength limit, the yield limit, the elongation and so on. These parameters vary greatly due to material differences. The tensile strength limit of stainless steel tubes is usually 335-565MPa, and the yield limit is usually 205-480MPa. The higher the elongation of stainless steel, the lower the yield limit, the better the plasticity of the welding.
Secondly, from the fracture toughness of stainless steel, the fracture of stainless steel pipe is mainly ductile fracture and brittle fracture. Excessive tensile stress and crack defect are the main causes of ductile fracture. The main factors of brittle fracture are joint action of low temperature, stress and crack defects. In order to avoid breakage of stainless steel pipes under working conditions, we should pay attention to eliminate pipe crack defects and reduce external stress during pipe production and construction.
The third is the reliable connection performance of the material, which requires that the stainless steel pipe can have excellent connection performance under certain connection process, process parameters and structural form.
The fourth is to take into account the corrosion resistance of the selected materials. Although the urban gas is the purified gas, the corrosion of the inner wall of the stainless steel pipe can not be considered. The indoor gas pipeline is exposed to the atmosphere for a long time. The corrosion resistance of the outer wall of the stainless steel pipe should be taken into consideration, especially in the areas where the atmospheric environment is bad, and the performance should be paid more attention.
The fifth is the temperature difference adaptability of stainless steel pipe, that is, under the harsh environment conditions, such as low temperature and high temperature, stainless steel pipe does not produce low temperature brittle fracture and high temperature deformation.
Source: China Stainless Steel Pipelines Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)