1 Scope
This standard specifies the dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of austenitic - ferritic (duplex) grade stainless steel welded tubes and pipes (hereinafter referred to as "steel tube").
This standard is applicable to corrosion-resistant austenitic - ferritic (duplex) grade stainless steel welded tubes and pipes for pressure-bearing equipment, fluid transporter and heat exchanger.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to) or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents apply. For undated reference, the latest edition of the normative documents referred to applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy--the Ammonium Persulfate Oxidation Volumetric Method for the Determination of Chromium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content
GB/T 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - the Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.23 Methods for Chemical Analysis of Iron, Steel and Alloy - the Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - the Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Methods for Chemical Analysis of Iron, Steel and Alloy - the Thiocyanate Direct Photometric Method for the Determination of Molybdenum Content
GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy - the α-denzoinoxime Gravimetric Method for the Determination of Molybdenum Content
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - the Neutral Titration Method for the Determination of Nitrogen Content after Distillation Separation
Foreword I
1 Scope
2 Normative References
3 Classification and Code
4 Ordering Information
5 Dimension, Shape and Weight
6 Technical Requirements
7 Test Method
8 Inspection Rules
9 Packaging, Marking and Quality Certificate
Annex A (Informative) Comparison Table of Duplex Stainless Steel Designations in each Standard
