1、Carbon Steel,Alloy Steel,Stainless Steel,and Nickel Base Alloy Castings for Use in the Petroleum and Natural Gas IndustryAPI SPECIFICATION 20ASECOND EDITION,AUGUST 2017ADDENDUM 1,SEPTEMBER 2018ADDENDUM 2,APRIL 2020API MONOGRAM PROGRAM EFFECTIVE DATE:OCTOBER 1,2020Special NotesAPI publications necess
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16、ds Department,API,1220 L Street,NW,Washington,DC 20005,standardsapi.org.iiiContentsPage1Scope.12Normative References .13Terms,Definitions,and Abbreviations.33.1Terms and Definitions.33.2Abbreviations.64Foundry Qualification.64.1General.64.2Quality Management System(QMS).64.3Qualification Casting.74.4Qualification Test Coupon(QTC).84.5Casting Qualification Testing.104.6Acceptance of the Qualification Casting.154.7Records of Qualification.174.8Limits of Casting Qualifications .175Production Castin