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GB/T 32289-2015Quality Carbon Structure Steels and Alloy Structure Steels for Large Forgings (English PDF)

大型锻件用优质碳素结构钢和合金结构钢

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Issued by

General Administration of Quality Supervision, Inspection and

Level / Type

National · Recommended

Issue date

December 10, 2015

Implementation date

November 1, 2016

Scope

GB/T 32289-2015 is the English-translated version of 大型锻件用优质碳素结构钢和合金结构钢.

GB/T 32289-2015 — This Standard specifies the classification and codes, order content, dimensions, shape, weight and allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of high quality carbon structure steels and alloy structure steels for large forgings.

This Standard is applicable to forged round steels with nominal diameter greater than 250 mm ~ 1500 mm, forged square steels with side length greater than 250 mm ~ 1300 mm, and forged flat steels with thickness greater than 250 mm ~ 1000 mm and width greater than 250 mm ~ 1700 mm for normal use (hereinafter referred to as forged steels).

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Document preview — GB/T 32289-2015

National Standard of the People's Republic of China

ICS: 77.140.60

Issued by: General Administration of Quality Supervision, Inspection and

Foreword3
1 Scope4
2 Normative References4
3 Classification and Codes6
4 Order Content6
5 Dimensions, Shape, Weight and Allowable Deviations7
6 Technical Requirements8
7 Test Methods13
8 Inspection Rules14
9 Packaging, Marking and Quality Certification15

Foreword

This Standard was drafted according to the rules given in GB/T 1.1-2009.

This Standard was proposed by China Iron and Steel Association.

The Standard shall be under the jurisdiction of the Technical Committee on Steel of Standardization Committee of China (SAC/TC 183).

1 Scope

This Standard specifies the classification and codes, order content, dimensions, shape, weight and allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of high quality carbon structure steels and alloy structure steels for large forgings.

2 Normative References

The following documents are essential to the application of this Standard. For the dated references, only the dated editions are applicable to this Standard. For the undated references, their latest editions (including all amendments) are applicable to this Standard.

GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 225 Steel - Hardenability Test by End Quenching (Jominy Test) GB/T 226 Test Method for Macrostructure and Defect of steel by etching GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room Temperature GB/T 229 Metallic Materials - Charpy Notch Impact Test GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method GB/T 699 Quality Carbon Structural Steels GB/T 908 Forged Bars - Dimensions, Shape, Weight and Tolerances GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 2101 General Provisions on Acceptance, Package, Marking and Quality Certificate for Profile Steel GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 3077 Alloy Structure Steels GB/T 4162 Forged and Rolled Steel Bars — Method for Ultrasonic Testing GB/T 4336 Carbon and Low-Alloy Steel-Determination of Multi-Element Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method) GB/T 6394 Metal - Methods for Estimating the Average Grain Size GB/T 6402-2008 Steel Forgings - Method for Ultrasonic Testing GB/T 7736 Ultrasonic Inspecting Method for Macro-structure and Imperfection of Steel GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions -Micrographic Method Using Standards Diagrams GB/T 11261 Steel and Iron - Determination of Oxygen Content - The Pulse Heating Inert Gas Fusion - Infra-Red Absorption Method GB/T 13298 Inspection Methods of Microstructure for Metals GB/T 13299 Steel - Determination of Microstructure GB/T 15711 Steel Products - Method for Etch Test of Tower Sample GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition GB/T 20123 Steel and Iron—Determination of Total Carbon and Sulphur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method) GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal Conductimetric Method after Fusion in a Current of Inert Gas

6.3 Delivery state

6.3.1 The forgings are normally delivered in the state of annealing treatment.

6.3.2 If the purchaser requires and it is indicated in the contract, they can also be normalizing treatment.

6.3.3 If the purchaser requires and it is indicated in the contract, they can also be

6.4 Manufacturing process

The forgings shall be forged and formed with a forging press with sufficient capacity.

Their forging ratio shall meet the following requirements.

a) For the forgings for thermal pressure processing or the forgings made of electroslag steel ingot, their forging ratio shall not be less than 2.0;

b) For the forgings upset in the middle, their forging ratio shall not be less than 2.5;

c) For the forgings used in cutting processing, their forging ratio shall not be less than 3.0.

6.5 Mechanical properties

6.5.1 The delivery hardness of the forgings shall meet the requirements of GB/T 699 and GB/T 3077. When it is not specified, the hardness value of actual measurement shall be provided.

6.5.2 If the purchaser requires and it is negotiated by supplier and purchaser and indicated in the contract, it is allowed to take samples from the test piece forged into 90 mm ~ 100 mm for the test on the mechanical properties of the forgings with nominal dimension not more than 400 mm. Its results shall meet the requirements of GB/T 699 and GB/T 3077.

6.6 Macrostructure

6.6.1 No visible defect is allowed in the test pieces of the cross-section etch

macrostructure of the forgings, including residual shrinkage, bubble, crack, inclusion, skull patch and flake.

6.6.2 If the purchaser requires and it is indicated in the contract, for the forgings with nominal dimensions not more than 400 mm, the qualifying level of the etch macrostructure shall meet the requirements of Table 5.

depth and shall transit smoothly. Indentations or pits not exceeding half of the tolerances calculated from the actual dimensions or cracks not exceeding 0.2 mm in depth are allowed.

6.9 Special requirements

If it is agreed by supplier and purchaser and indicated in the contract, the forgings of the following special requirements can be supplied.

a) Reduce or increase the chemical composition range of the designations listed in GB/T 699 and GB/T 3077;

b) Control the sulphur content within 0.015% ~ 0.035%;

c) Use the electroslag remelting process;

d) Require the analysis of oxygen content or other residual elements;

e) Provide the V notch impact test values;

f) Provide the forgings which meet the hardenability requirements;

g) Macrostructure (when the nominal dimension is more than 400 mm);

h) Mechanical properties (when the nominal dimension is more than 400);

i) Test grain size;

j) Test non-metallic inclusion;

k) Test tower sample;

l) Test microstructure;

m) Conduct test according to GB/T 4162;

n) and so on.

7 Test Methods

The test items and test methods of the forgings shall meet the requirements of Table 7.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223

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