GB/T 1221-2007 in English

1 Scope

This standard specifies the dimension, shape, technical requirements, test methods, acceptance rules, packaging mark and quality certificate of heat-resistant steel bars (a generic term for round steel, square steel, flat steel and hexagonal steel).
This standard is applicable to hot-rolled and forged steel bars with dimension (diameter, side length, thickness or opposite side distance; hereinafter referred to as dimension) less than or equal to 250mm, or cold-worked steel bars with dimension less than or equal to 120mm. Hot-rolled and forged steel bars with dimension greater than 250mm and cold-worked steel bars with dimension greater than 120mm may be supplied based on the agreement of both the supplier and the purchaser.

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, the parties coming to an agreement according to this standard are encouraged to research whether the latest editions of these documents apply. For undated references, the latest editions of the normative documents are 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 223.4 Methods for Chemical Analysis of Iron, Steel and Alloy - the Ammonium Persulfate Oxidation Volumetric Method for the Determination of Chromium Content
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy; the Reduced Molybdosilicate Spectrophotometric Method for the Determination of Acid-soluble Silicon Content
GB/T 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Fluoride Separation-EDTA Titration Method for the Determination of Aluminium Content
GB/T 223.9 Methods for Chemical Analysis of Iron, Steel and Alloy - the Chrom Azurol S Photometric Method for the Determination of Aluminium Content
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 223.14 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 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - the Chromotropic Acid Photometric Method for the Determination of Titanium Content
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - the Diantipyrylmethane Photometric Method for the Determination of Titanium 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 223.23 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 - Determination of Molybderum Content - the Thiocyanate Spectrophotometric Method
GB/T 223.28 Methods for Chemical Analysis of Iron Steel and Alloy; the D-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
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 - Detetmination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
GB/T 223.43 Methods for Chemical Analysis of Iron, Steel and Alloy- Determination of Tungsten 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 Methods for Chemical Analysis of Iron, Steel and Alloy; the Reduced Molybdoantimonyl Phosphoric Acid Photometric Method for the Determination of Phosphorus Content
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 223.63-1998, neq ISO R629)
GB/T 223.64 Methods for Chemical Analysis of Iron, Steel and Alloy - the Flame Atomic Absorption Spectrometric Method for the Determination of Manganese Content
GB/T 223.67 Methods for Chemical Analysis of Iron, Steel and Alloy; the Reducing Distillation-Methylene Blue Photometric Method for the Determination of Sulfur Content
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - the Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content

1 Scope
2 Normative References
3 Terms and Definitions
4 Ordering Information
5 Classification
6 Dimension, Shape, Weight and Tolerance
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Packaging, Marking and Quality Certificate
Appendix A (Informative) Typical Heat Treating System of Heat-resistant Steel Bars or Specimens
Appendix B (Informative) Characteristics and Uses of Heat-resistant Steel