1、Materials and Fabrication of 21/4Cr-1Mo,21/4Cr-1Mo-1/4V,3Cr-1Mo,and 3Cr-1Mo-1/4V Steel Heavy Wall Pressure Vessels for High-temperature,High-pressure Hydrogen ServiceAPI RECOMMENDED PRACTICE 934-ATHIRD EDITION,JANUARY 2019ERRATA 1,SEPTEMBER 2021Special NotesAPI publications necessarily address probl
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