What are the specific standards for using stainless steel welding pipes in the construction industry

The use of stainless steel welded pipes in the construction industry involves multiple standards covering aspects such as product dimensions, quality, and performance. Here are some common specific standards:

Product dimensions and tolerance standards

GB/T 17395-2018 "Seamless Steel Pipes - Dimensions, Shape, Weight and Allowable Deviations": Specifies the series of dimensions such as outer diameter and wall thickness for seamless steel pipes, along with corresponding allowable deviations. Although mainly for seamless steel pipes, the regulations on some size specifications have certain reference significance for stainless steel welded pipes, and can be used as supplements in cases where there are no specific welding pipe size standards.

GB/T 21835-2019 "Welded Steel Pipes - Dimensions and Unit Length Weight": Clearly defines the nominal outer diameter, nominal wall thickness, and theoretical weight per unit length of welded steel pipes, providing a basis for the construction industry to select appropriate-sized stainless steel welded pipes for applications such as building structures and pipeline systems, ensuring their compatibility with other components.

Material and chemical composition standards

GB/T 20878-2007 "Stainless Steel and Heat Resistant Steel - Designations and Chemical Composition": Specifies various stainless steel designations and their corresponding chemical composition ranges. The material of stainless steel welded pipes used in construction must meet the chemical composition requirements of the corresponding designation to ensure their corrosion resistance, strength, etc.

GB/T 4237-2015 "Stainless Steel Hot-Rolled Plates and Steel Sheets": Specifies the chemical composition, mechanical properties, etc. of stainless steel hot-rolled plates and steel sheets. Since stainless steel welded pipes often originate from hot-rolled plates and steel sheets, this standard indirectly regulates the quality of stainless steel welded pipes and plays a role in standardizing their material quality.

Mechanical property standards

GB/T 228.1-2021 "Metal Materials - Tensile Test - Part 1: Room Temperature Test Methods": Specifies the methods and requirements for tensile tests of metal materials at room temperature. Through this test, the tensile strength, yield strength, elongation after fracture, etc. of stainless steel welded pipes can be determined, ensuring that they can withstand corresponding loads in construction applications.

GB/T 232-2010 "Metal Materials - Bending Test Methods": Used to determine the plastic deformation ability of metal materials under bending, stainless steel welded pipes may undergo bending and other processing operations during construction. This standard can test whether cracks or other defects occur during the bending process, ensuring their processing performance and usage performance.

Process and quality standards

GB/T 3280-2015 "Stainless Steel Cold-Rolled Plates and Steel Sheets": Involves the dimensions, shape, weight and allowable deviations, technical requirements, etc. of stainless steel cold-rolled plates and steel sheets, which is of great significance for the quality control of stainless steel welded pipe raw materials, and affects the final quality of the welded pipe.

GB/T 12771-2019 "Stainless Steel Welded Pipes for Fluid Transportation": Specifies the dimensions, shape, weight, technical requirements, etc. of stainless steel welded pipes for fluid transportation, applicable to stainless steel welded pipes for transporting water, oil, gas, etc. in building water supply and heating ventilation systems. Stainless steel welded pipes for such systems in the construction industry must comply with this standard.

GB 50235-2010 "Industrial Metal Pipeline Engineering Construction Code": Outlines detailed regulations for construction, installation, inspection, etc. of industrial metal pipeline projects. Some stainless steel welded pipe pipeline systems for industrial use in the construction industry need to follow this standard to ensure the quality and safety of pipeline installation.

Surface quality standards

GB/T 17394.1-2014 "Metal Materials - Rockwell Hardness Test - Part 1: Test Methods": Can be used to detect the hardness of stainless steel welded pipe surfaces, indirectly judging the surface quality and material performance of the pipe, ensuring that the surface hardness meets the usage requirements and preventing problems such as surface wear and scratches during use. GB/T 1031-2009 "Product Geometric Specifications (GPS) - Surface Roughness - Profile Method - Surface Roughness Parameters and Their Values": This standard specifies the parameters and values of surface roughness. The surface roughness of stainless steel welded pipes will affect their appearance quality, corrosion resistance, and the compatibility with other components. This standard provides a basis for controlling the surface roughness of welded pipes.