Analysis of and Enlightenment from Differentiation between Specifications for Identical Digital-coded Stainless Steel Pipes under ASME SA/SB XYZ and ASTM A/B XYZ

The specification for stainless steel pipe of ASME SA/SB XYZ is made on the basis of the specification for the stainless steel pipe with the same digital codes under ASTM A/B XYZ，and listed in ASME B&PVC Section 11 Part A&B and used for material selecting. In fact，contents of different sections of the said two specifications are almost the same，or identical except certain articles concerning austenitic stainless steel pipe under Specification ASME SA/SB XYZ which result from amendments of correspondent articles under Specification ASTM A/B XYZ. And the amendments are made mainly addressing to the heat treatment requirements and operation procedures for the Grade H stainless pipe. Cited in the essay are the details and critical points concerning the different articles under the two specifications， and also elaborated are relavant reasons， background， and enlightenment and questions.