This standard specifies the ordering information, dimension, appearance, weigh, technical requirements, test methods, inspection rules, packing, marking and quality certificate of the seamless steel tubes for low and medium pressure boilers.
This standard is applicable to the seamless steel tubes that are made of quality carbon structural steels and used for manufacturing various low and medium pressure boilers.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to this standard are encouraged to research whether the latest editions of these labels are applied or not. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 222 "Permissible Tolerances for Chemical Composition of Steel Products"
GB/T 223.3 "Methods for Chemical Analysis of Iron, Steel and Alloy—The Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content"
GB/T 223.5 "Steel and Iron — Determination of Acid-soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method"
GB/T 223.10 "Methods for Chemical Analysis of Iron, Steel and Alloy—The Cupferron Separation-Chrome Azurol S Photometric Method for the Determination of Aluminium Content"
GB/T 223.12 "Methods for Chemical Analysis of Iron, Steel and Alloy—The Sodium Carbonate Separation-diphenyl Carbazide Photometric 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 "Iron Steel and Alloy—Determination of Nickel Content—The Dimethylglyoxime Spectrophotometric Method"
GB/T 223.37 "Methods for Chemical Analysis of Iron, Steel and Alloy—The Indophenal Blue Photometric Methods for the Determination of Nitrogen Content after Distillation Separation"
GB/T 223.58 "Methods for Chemical Analysis of Iron, Steel and Alloy—The Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content"
GB/T 223.59 "Methods for Chemical Analys
