1 Scope
This standard specifies the classification, code, dimensions, appearance, weight, technical requirements, test methods, inspection rules, packing, marking and quality certificate related to the seamless steel tubes for petroleum cracking.
This standard is applicable to the seamless steel tubes for use of furnance tube, heat exchanger tube and pressure piping in the petrochemical industry.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
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 223.11 "Iron Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method"
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 223.13 "Methods for Chemical Analysis of Iron, Steel and Alloy - The Ammonium Ferrous Sulfate Titration Method for the Determination of Vanadium Content"
GB/T 223.14 "Methods for Chemical Analysis of Iron, Steel and Alloy -The N-benzoy-N-phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium 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 223.25 "Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content"
GB/T 223.26 "Iron Steel and Alloy-Determination of Molybdenum Content-The Thiocyanate 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 223.40 "Iron, Steel and Alloy-Determination of Niobium Contentby the Sulphochlorophenol S Spectrophotometric Method"
GB/T 223.53 "Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content"
GB/T 223.54 "Methods for Chemical Analysis of Iron, Steel and Alloy--The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content"
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 "Iron Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method"
GB/T 223.60 "Methods for Chemical Analysis of Iron, Steel and Alloy-The Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content"
GB/T 223.61 "Methods for Chemical Analysis of Iron, Steel and Alloy-The Ammonium Phosphomolybdate Volumetric Method for the Determination of Phosphorus Content"
GB/T 223.62 "Methods for Chemical Analysis of Iron, Steel and Alloy-The Butyl Acetate Extraction Photometric Method for the Determination of Phosphorus Content"
GB/T 223.63 "Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium (potassium) Periodate Photometric Method for the Determination of Manganese Content"
GB/T 223.64 "Iron Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method"
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3 Classification and Code
The seamless steel tubes in this standard are divided into two types according to manufacturing methods with the type and code of:
a) Hot-rolled (squeezed, extended) steel tube W-H;
b) Cold drawn (rolled) steel tube W-C.
