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GB/T 5216-2004 English PDF (GBT5216-2004)

GB/T 5216-2004 English PDF (GBT5216-2004)

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GB/T 5216-2004: Structural steels subject to end-quench hardenability requirements

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.
GB/T 5216-2004
GB
ICS 77.140.20 H 40
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Replace GB/T 5216-1985
Structural Steels Subject to End-quench
Hardenability Requirements
ISSUED ON. JANUARY 19, 2004
IMPLEMENTED ON. JULY 1, 2004
Jointly Issued by. General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Attachment 1 (Corrigendum) ... 3
Foreword ... 4
1 Scope ... 6
2 Normative References ... 6
3 Order Contents... 9
4 Classification and Code Number ... 10
5 Dimensions, Shape, Weight and Permissible Tolerances ... 10
6 Technical Requirements ... 11
7 Testing Method ... 17
8 Inspection Rules ... 18
9 Packaging, Marking and Quality Certificate ... 18
Appendix??A (Informative) Calculation Methods of Steel Hardenability) ... 39 Appendix??B (Informative) Comparison Table of Newly-added Grades Listed in Table 1 of This Standard with Overseas Grades ... 44
Foreword
This standard replaces GB/T 5216-1985 ?€?Technical Requirements for Structural Steel with Specified Hardenability Bands?€?.
Compared with GB/T 5216-1985, the main changes of this standard are as follows. - Change the standard name to ?€?Structural Steels Subject to End-quench Hardenability Requirements";
- Add the sections ?€?Normative References?€?, ?€?Order Contents?€? and ?€?Smelting Process?€? etc.;
- In Article 6.3, add ?€?according to the agreement of the supply and purchaser about the delivery, the surface of the round steel used for press working may adopt turning, peeling or other finishing methods?€?;
- The grades are increased to 24 from 15 (excluding half free cutting steel). Add the 11 grades - 15CrH, 20Cr1H, 15CrMoH, 20CrMoH, 22CrMoH, 42CrMoH, 16CrMnH,
20CrMnH, 15CrMnBH, 17CrMnBH, and 20CrNi2MoH. Delete the 2 grades -
20MnMoBH and 22MnVBH. And add the unified numbering of the grades;
- Tighten the content requirements of residual elements such as sulphur, phosphorus, chromium, nickel and copper;
- The hardenability bands are classified into H, HH and HL bands from the primary one band. Add "The supply methods of end-quench hardenability may adopt actual measurement and calculation according to the formula?€?;
- Delete the ?€?impression diameter ?€?in Table 3; the primary Articles 3.1.3, 3.1.5, 3.3.2 and 3.4.2; as well as the requirements in relation to ?€?fracture inspection "; - Change the ?€?segregation?€? in primary Article 3.6.2 into ?€?Ingot case segregation?€?. The Ingot case segregation of the high quality steel is changed from Grade 2.5 into Grade 2; - Change the primary Article 3.7.1 ?€?Inspection for the non-metallic inclusions in steel" from agreement item into basic guarantee item. Specify the qualification grades according to Classes A, B, C and D;
- Change the primary Article 3.7.2 into ?€?the austenite grain size of the steel is not less than Grade 5?€?;
- Change ?€?c. Test for impact ductility of non-boron-contained steel?€? to ?€?c. Test for mechanical property?€?. And add ?€?Test for oxygen content of steel?€?;
- Add the hardenability curve of the 11 newly-added grades. And delete the hardenability Structural Steels Subject to End-quench Hardenability
Requirements
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 corrigendum), or revisions of, any of these publications do not apply. However, all parties who have reached 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 Flame atomic Absorption Spectrophotometric Method for the Determination of 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 M...

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