This standard specifies the terms and definitions, ordering information, size, profile and weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification for hot-rolled, forged and cold drawn spring steels.
This standard is applicable to round spring steels and square steels (hereinafter referred to as "bars") not greater than 120 mm in nominal diameter or side length, flat spring steels not greater than 160 mm in nominal width or 60 mm in nominal thickness, and spring steel reeled rods not greater than 40 mm in nominal diameter.
The designation and chemical composition specified in this standard are also applicable to ingot steel, steel billet and their products.
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 referenced document (including any amendments) applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron—Determination of Acid-soluble Silicon and Total Silicon Content—Reduced Molybdo-silicate Spectrophotometric Method
GB/T 223.11 Iron, Steel and Alloy—Determination of Chromium Content—Visual Titration or Potentiometric Titration Method
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 223.19 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 223.26 Iron, Steel and Alloy—Determination of Molybdenum Content—The Thiocyanate Spectrophotometric Method
GB/T 223.43 Iron, Steel and Alloy—Determination of Tungsten Content—Gravimetric Method and Spectrophotometric Method
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 223.64 Iron, Steel and Alloy—Determination of Manganese Content—Flame Atomic Absorption Spectrometric Method
GB/T 223.72 Iron Steel and Alloy—Determination of Sulfur Content—Gravimetric Method
GB/T 223.75 Iron, Steel and Alloy—Determination of Boron Content—Methanol Distillation-Curcumin Photometric Method
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy—The Flame Atomic Absorption Spectrometric Method for the Determination of Vanadium Content
