1 Scope
This standard specifies the steel dimensions, shape, weight and permissible tolerances, technical requirements, test methods, inspection rules, packaging, sign and quality certificate etc. of the hot rolling and hot forging structural steels subject to end-quench hardenability requirements.
This standard is applicable to the hot rolling and forging structural steel bars of hardenability used in machinery manufacture with its diameter or thickness no less than 30 mm. The steel hardenability is determined by edge quenching or calculated by the formula.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), 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 edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 222-1984 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy-The Diantipyryl Methane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy-The Reduced Molybdosilicate Spectro-Photometric Method for the Determination of Acid-Soluble Silicon 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 Diantipyryl Methane Photometric Method for the Determination of Titanium Content
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy-The Neocuproine-Chloroform Extraction Photometric 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 223.24 Methods for Chemical Analysis of Iron, Steel and Alloy-The Extraction Separation-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 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method
GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy-The Flameatomic Absorption Spectrophotometric Method for the Determinationof Nickel Content (GB/T 223.54-1987, eqv ISO 4940:1985, Steel and cast iron-Determination of nickel content-Flame-atomic: absorption spectrophtometric method)
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy-The Extraction-Absorption Catalytic Polarographic Method for the Determination of Manganese Content
GB/T 223.59 Methods for Chemical Analysis of Iron, Steel and Alloy-The Sodium Arsenite-Sodium Nitrite Titrimetric 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 223.64 Iron, Steel and Alloyed - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method
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
GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-Volumetric Method after Combustion in the Pipe Furnace
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy-The Gravimetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content
GB/T 223.72 Methods for Chemical Analysis of Iron, Steel and Alloy-The Alumina Chromatographic Separation-Bar-Ium Sulfate Gravimetric Method for the Determination of Sulphur Content
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
GB/T 225 Steel-Hardenability Test by End Quenching (Jominy Test) (GB/T 225-1988, eqv ISO 642:1979)
GB/T 226 Steel-Hardenability Test by End Quenching (Jominy Test) (GB/T 226-1991, Neq ISO 4969:1980, Steel-Macroscopie Examination by Etching with Strong Mineral Acids)
GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 229 Metallic Materials-Charpy Notch Impact Test (GB/T 229-1994, Eqv ISO 83:1976, Steel-Charpy Impact Test (U-Notch), Eqv ISO 148:1983, Steel-Charpy Impact Test (V-Notch))
GB/T 231.1 Metallic Materials-Brinell Hardness Test-Part 1: Test Method (GB/T 231.1-2002, eqv ISO 6506-1:1999)
GB/T 233 Metallic Materials-Forging Test
GB/T 702 Hot-Rolled Round and Square Steels-Dimension, Shape, Weight and Tolerance
GB/T 908 Forged Round and Square Steels-Dim
1 Scope
2 Normative References
3 Order Contents
4 Classification and Code Number
5 Dimensions, Shape, Weight and Permissible Tolerances
6 Technical Requirements
7 Testing Method
8 Inspection Rules
9 Packaging, Marking and Quality Certificate
Appendix A (Informative) Calculation Methods of Steel Hardenability 1)
Appendix B (Informative) Comparison Table of Newly-added Grades Listed in Table 1 of This Standard with Overseas Grades
