The ASTM standard for stainless steel welded pipe depends on the specific grade and requirements of the application. The commonly referenced ASTM standards for stainless steel welded pipe include:

1. ASTM A312 - Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

2. ASTM A358 - Standard Specification for Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications

3. ASTM A790 - Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

These standards cover various grades of stainless steel and specify dimensions, tolerances, materials, and testing requirements for welded stainless steel pipes used in different industrial applications. It's important to refer to the specific ASTM standard that corresponds to the grade and intended use of the stainless steel welded pipe.