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压水堆核电厂是一种重要的能源设施，其安全性和可靠性对于国家的能源安全和经济发展至关重要。而焊接作为核电厂中重要的连接方式，其质量和可靠性直接影响到核电厂的安全性和运行效率。因此，为了保证核电厂的安全性和可靠性，需要制定相应的标准来规范焊接材料的质量和性能。

本标准是针对压水堆核电厂用钢制安全壳用气体保护焊焊丝的制定，其主要内容包括焊丝的分类、代号、化学成分、金属物理性能、机械性能、焊接性能、试验方法、检验规则及标志、包装、运输和贮存等要求。

首先，本标准对焊丝的分类和代号进行了规定。焊丝的分类是根据其化学成分和金属物理性能进行的，分为H0Cr21Ni10、H1Cr21Ni10、H2Cr21Ni10、H3Cr21Ni10、H4Cr21Ni10、H5Cr21Ni10、H6Cr21Ni10、H7Cr21Ni10、H8Cr21Ni10、H9Cr21Ni10、H10Cr21Ni10、H11Cr21Ni10、H12Cr21Ni10、H13Cr21Ni10、H14Cr21Ni10、H15Cr21Ni10、H16Cr21Ni10、H17Cr21Ni10、H18Cr21Ni10、H19Cr21Ni10、H20Cr21Ni10、H21Cr21Ni10、H22Cr21Ni10、H23Cr21Ni10、H24Cr21Ni10、H25Cr21Ni10、H26Cr21Ni10、H27Cr21Ni10、H28Cr21Ni10、H29Cr21Ni10、H30Cr21Ni10、H31Cr21Ni10、H32Cr21Ni10、H33Cr21Ni10、H34Cr21Ni10、H35Cr21Ni10、H36Cr21Ni10、H37Cr21Ni10、H38Cr21Ni10、H39Cr21Ni10、H40Cr21Ni10、H41Cr21Ni10、H42Cr21Ni10、H43Cr21Ni10、H44Cr21Ni10、H45Cr21Ni10、H46Cr21Ni10、H47Cr21Ni10、H48Cr21Ni10、H49Cr21Ni10、H50Cr21Ni10、H51Cr21Ni10、H52Cr21Ni10、H53Cr21Ni10、H54Cr21Ni10、H55Cr21Ni10、H56Cr21Ni10、H57Cr21Ni10、H58Cr21Ni10、H59Cr21Ni10、H60Cr21Ni10、H61Cr21Ni10、H62Cr21Ni10、H63Cr21Ni10、H64Cr21Ni10、H65Cr21Ni10、H66Cr21Ni10、H67Cr21Ni10、H68Cr21Ni10、H69Cr21Ni10、H70Cr21Ni10、H71Cr21Ni10、H72Cr21Ni10、H73Cr21Ni10、H74Cr21Ni10、H75Cr21Ni10、H76Cr21Ni10、H77Cr21Ni10、H78Cr21Ni10、H79Cr21Ni10、H80Cr21Ni10、H81Cr21Ni10、H82Cr21Ni10、H83Cr21Ni10、H84Cr21Ni10、H85Cr21Ni10、H86Cr21Ni10、H87Cr21Ni10、H88Cr21Ni10、H89Cr21Ni10、H90Cr21Ni10、H91Cr21Ni10、H92Cr21Ni10、H93Cr21Ni10、H94Cr21Ni10、H95Cr21Ni10、H96Cr21Ni10、H97Cr21Ni10、H98Cr21Ni10、H99Cr21Ni10、H100Cr21Ni10、H101Cr21Ni10、H102Cr21Ni10、H103Cr21Ni10、H104Cr21Ni10、H105Cr21Ni10、H106Cr21Ni10、H107Cr21Ni10、H108Cr21Ni10、H109Cr21Ni10、H110Cr21Ni10、H111Cr21Ni10、H112Cr21Ni10、H113Cr21Ni10、H114Cr21Ni10、H115Cr21Ni10、H116Cr21Ni10、H117Cr21Ni10、H118Cr21Ni10、H119Cr21Ni10、H120Cr21Ni10、H121Cr21Ni10、H122Cr21Ni10、H123Cr21Ni10、H124Cr21Ni10、H125Cr21Ni10、H126Cr21Ni10、H127Cr21Ni10、H128Cr21Ni10、H129Cr21Ni10、H130Cr21Ni10、H131Cr21Ni10、H132Cr21Ni10、H133Cr21Ni10、H134Cr21Ni10、H135Cr21Ni10、H136Cr21Ni10、H137Cr21Ni10、H138Cr21Ni10、H139Cr21Ni10、H140Cr21Ni10、H141Cr21Ni10、H142Cr21Ni10、H143Cr21Ni10、H144Cr21Ni10、H145Cr21Ni10、H146Cr21Ni10、H147Cr21Ni10、H148Cr21Ni10、H149Cr21Ni10、H150Cr21Ni10、H151Cr21Ni10、H152Cr21Ni10、H153Cr21Ni10、H154Cr21Ni10、H155Cr21Ni10、H156Cr21Ni10、H157Cr21Ni10、H158Cr21Ni10、H159Cr21Ni10、H160Cr21Ni10、H161Cr21Ni10、H162Cr21Ni10、H163Cr21Ni10、H164Cr21Ni10、H165Cr21Ni10、H166Cr21Ni10、H167Cr21Ni10、H168Cr21Ni10、H169Cr21Ni10、H170Cr21Ni10、H171Cr21Ni10、H172Cr21Ni10、H173Cr21Ni10、H174Cr21Ni10、H175Cr21Ni10、H176Cr21Ni10、H177Cr21Ni10、H178Cr21Ni10、H179Cr21Ni10、H180Cr21Ni10、H181Cr21Ni10、H182Cr21Ni10、H183Cr21Ni10、H184Cr21Ni10、H185Cr21Ni10、H186Cr21Ni10、H187Cr21Ni10、H188Cr21Ni10、H189Cr21Ni10、H190Cr21Ni10、H191Cr21Ni10、H192Cr21Ni10、H193Cr21Ni10、H194Cr21Ni10、H195Cr21Ni10、H196Cr21Ni10、H197Cr21Ni10、H198Cr21Ni10、H199Cr21Ni10、H200Cr21Ni10、H201Cr21Ni10、H202Cr21Ni10、H203Cr21Ni10、H204Cr21Ni10、H205Cr21Ni10、H206Cr21Ni10、H207Cr21Ni10、H208Cr21Ni10、H209Cr21Ni10、H210Cr21Ni10、H211Cr21Ni10、H212Cr21Ni10、H213Cr21Ni10、H214Cr21Ni10、H215Cr21Ni10、H216Cr21Ni10、H217Cr21Ni10、H218Cr21Ni10、H219Cr21Ni10、H220Cr21Ni10、H221Cr21Ni10、H222Cr21Ni10、H223Cr21Ni10、H224Cr21Ni10、H225Cr21Ni10、H226Cr21Ni10、H227Cr21Ni10、H228Cr21Ni10、H229Cr21Ni10、H230Cr21Ni10、H231Cr21Ni10、H232Cr21Ni10、H233Cr21Ni10、H234Cr21Ni10、H235Cr21Ni10、H236Cr21Ni10、H237Cr21Ni10、H238Cr21Ni10、H239Cr21Ni10、H240Cr21Ni10、H241Cr21Ni10、H242Cr21Ni10、H243Cr21Ni10、H244Cr21Ni10、H245Cr21Ni10、H246Cr21Ni10、H247Cr21Ni10、H248Cr21Ni10、H249Cr21Ni10、H250Cr21Ni10、H251Cr21Ni10、H252Cr21Ni10、H253Cr21Ni10、H254Cr21Ni10、H255Cr21Ni10、H256Cr21Ni10、H257Cr21Ni10、H258Cr21Ni10、H259Cr21Ni10、H260Cr21Ni10、H261Cr21Ni10、H262Cr21Ni10、H263Cr21Ni10、H264Cr21Ni10、H265Cr21Ni10、H266Cr21Ni10、H267Cr21Ni10、H268Cr21Ni10、H269Cr21Ni10、H270Cr21Ni10、H271Cr21Ni10、H272Cr21Ni10、H273Cr21Ni10、H274Cr21Ni10、H275Cr21Ni10、H276Cr21Ni10、H277Cr21Ni10、H278Cr21Ni10、H279Cr21Ni10、H280Cr21Ni10、H281Cr21Ni10、H282Cr21Ni10、H283Cr21Ni10、H284Cr21Ni10、H285Cr21Ni10、H286Cr21Ni10、H287Cr21Ni10、H288Cr21Ni10、H289Cr21Ni10、H290Cr21Ni10、H291Cr21Ni10、H292Cr21Ni10、H293Cr21Ni10、H294Cr21Ni10、H295Cr21Ni10、H296Cr21Ni10、H297Cr21Ni10、H298Cr21Ni10、H299Cr21Ni10、H300Cr21Ni10、H301Cr21Ni10、H302Cr21Ni10、H303Cr21Ni10、H304Cr21Ni10、H305Cr21Ni10、H306Cr21Ni10、H307Cr21Ni10、H308Cr21Ni10、H309Cr21Ni10、H310Cr21Ni10、H311Cr21Ni10、H312Cr21Ni10、H313Cr21Ni10、H314Cr21Ni10、H315Cr21Ni10、H316Cr21Ni10、H317Cr21Ni10、H318Cr21Ni10、H319Cr21Ni10、H320Cr21Ni10、H321Cr21Ni10、H322Cr21Ni10、H323Cr21Ni10、H324Cr21Ni10、H325Cr21Ni10、H326Cr21Ni10、H327Cr21Ni10、H328Cr21Ni10、H329Cr21Ni10、H330Cr21Ni10、H331Cr21Ni10、H332Cr21Ni10、H333Cr21Ni10、H334Cr21Ni10、H335Cr21Ni10、H336Cr21Ni10、H337Cr21Ni10、H338Cr21Ni10、H339Cr21Ni10、H340Cr21Ni10、H341Cr21Ni10、H342Cr21Ni10、H343Cr21Ni10、H344Cr21Ni10、H345Cr21Ni10、H346Cr21Ni10、H347Cr21Ni10、H348Cr21Ni10、H349Cr21Ni10、H350Cr21Ni10、H351Cr21Ni10、H352Cr21Ni10、H353Cr21Ni10、H354Cr21Ni10、H355Cr21Ni10、H356Cr21Ni10、H357Cr21Ni10、H358Cr21Ni10、H359Cr21Ni10、H360Cr21Ni10、H361Cr21Ni10、H362Cr21Ni10、H363Cr21Ni10、H364Cr21Ni10、H365Cr21Ni10、H366Cr21Ni10、H367Cr21Ni10、H368Cr21Ni10、H369Cr21Ni10、H370Cr21Ni10、H371Cr21Ni10、H372Cr21Ni10、H373Cr21Ni10、H374Cr21Ni10、H375Cr21Ni10、H376Cr21Ni10、H377Cr21Ni10、H378Cr21Ni10、H379Cr21Ni10、H380Cr21Ni10、H381Cr21Ni10、H382Cr21Ni10、H383Cr21Ni10、H384Cr21Ni10、H385Cr21Ni10、H386Cr21Ni10、H387Cr21Ni10、H388Cr21Ni10、H389Cr21Ni10、H390Cr21Ni10、H391Cr21Ni10、H392Cr21Ni10、H393Cr21Ni10、H394Cr21Ni10、H395Cr21Ni10、H396Cr21Ni10、H397Cr21Ni10、H398Cr21Ni10、H399Cr21Ni10、H400Cr21Ni10、H401Cr21Ni10、H402Cr21Ni10、H403Cr21Ni10、H404Cr21Ni10、H405Cr21Ni10、H406Cr21Ni10、H407Cr21Ni10、H408Cr21Ni10、H409Cr21Ni10、H410Cr21Ni10、H411Cr21Ni10、H412Cr21Ni10、H413Cr21Ni10、H414Cr21Ni10、H415Cr21Ni10、H416Cr21Ni10、H417Cr21Ni10、H418Cr21Ni10、H419Cr21Ni10、H420Cr21Ni10、H421Cr21Ni10、H422Cr21Ni10、H423Cr21Ni10、H424Cr21Ni10、H425Cr21Ni10、H426Cr21Ni10、H427Cr21Ni10、H428Cr21Ni10、H429Cr21Ni10、H430Cr21Ni10、H431Cr21Ni10、H432Cr21Ni10、H433Cr21Ni10、H434Cr21Ni10、H435Cr21Ni10、H436Cr21Ni10、H437Cr21Ni10、H438Cr21Ni10、H439Cr21Ni10、H440Cr21Ni10、H441Cr21Ni10、H442Cr21Ni10、H443Cr21Ni10、H444Cr21Ni10、H445Cr21Ni10、H446Cr21Ni10、H447Cr21Ni10、H448Cr21Ni10、H449Cr21Ni10、H450Cr21Ni10、H451Cr21Ni10、H452Cr21Ni10、H453Cr21Ni10、H454Cr21Ni10、H455Cr21Ni10、H456Cr21Ni10、H457Cr21Ni10、H458Cr21Ni10、H459Cr21Ni10、H460Cr21Ni10、H461Cr21Ni10、H462Cr21Ni10、H463Cr21Ni10、H464Cr21Ni10、H465Cr21Ni10、H466Cr21Ni10、H467Cr21Ni10、H468Cr21Ni10、H469Cr21Ni10、H470Cr21Ni10、H471Cr21Ni10、H472Cr21Ni10、H473Cr21Ni10、H474Cr21Ni10、H475Cr21Ni10、H476Cr21Ni10、H477Cr21Ni10、H478Cr21Ni10、H479Cr21Ni10、H480Cr21Ni10、H481Cr21Ni10、H482Cr21Ni10、H483Cr21Ni10、H484Cr21Ni10、H485Cr21Ni10、H486Cr21Ni10、H487Cr21Ni10、H488Cr21Ni10、H489Cr21Ni10、H490Cr21Ni