四通,XS是壁厚,NACE MR0175这标准是美国腐蚀工程师协会 钢材在H2S环境里的评定,ASTM A234是材质,GR.WPB-S是等级
英语翻译CROSS XS BE NACE MR-0175 ASTM A234 GR.WPB-S
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