This part of GB/T 21833 specifies ordering information,dimensions,shapes,mass,technical requirements,test methods,inspection rules,packaging,marking and quality certification of seamless austenitic-ferritic (duplex) stainless steel pipes for fluid service.
This part is applicable to seamless austenitic-ferritic (duplex) stainless steel pipes (Hereafter referred to as pipes) for fluid service.

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This standard specifies the ordering information, dimensions, shapes, masses and permissible variations, technical requirements, test methods, inspection rules, packaging, marking and quality certification of the welded austenitic stainless steel tubes for boiler and heat exchanger.
This standard is applicable to the welded austenitic stainless steel tubes (Hereinafter referred to as tubes)for heat exchanger and medium-and-low pressure boilers.

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This standard specifies classification, designations , dimensions, shapes, masses, technical requirements, test pieces, test methods, inspection rules, packaging, marking and quality certification of the seamless steel tubes and pipes for high pressure boiler.
This standard is applicable to the seamless steel tubes and pipes for steam boilers and pipelines with high pressure and above.

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This standard specifies ordering information，dimensions，shapes，masses and permisible variations，technical requirements，test methods，inspection rules，packaging，marking and quality certification of seamless precision stainless steel pipes for rail transit vehicle braking system.
This standard is applicable to the seamless precision stainless steel pipes (Hereinafter referred to as pipes) for rail transit vehicle (such as locomotives，powered car train-sets，urban rail trains and freight or passenger trains) braking system.

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本标准规定了无缝钢管的尺寸、外形、重量及允许偏差。 本标准适用于制定各类用途的平端无缝钢管标准时，选择尺寸、外形、重量及允许偏差。

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本标准规定了焊接钢管的公称尺寸及单位长度重量。 本标准适用于制定各类用途的圆形平端焊接钢管标准时，选择公称尺寸和单位长度重量。

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本文件规定了输送流体用双金属复合钢管（以下简称复合钢管)的分类和代号、订货内容、制造工艺、技术要求、试验方法、检验规则、标志、包装、贮存和质量证明书。
本文件适用于输送生活用水、消防用水、空调用水、再生水、污废水等流体的复合钢管，以及水利工程、输送蒸汽、燃气、空气等用途的复合钢管和陆地石油天然气输送、油井集输、化工管道用复合钢管。

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