GB/T 9945-2012 in English

《GB/T 9945-2012热轧球扁钢》由TC183（全国钢标准化技术委员会）归口，TC183SC8（全国钢标准化技术委员会型钢分会）执行，主管部门为中国钢铁工业协会。

GB/T 9945-2012 Hot-rolled bulb flats

1 Scope

This standard specifies the order information, model, dimension, shape, weight and permissible tolerance, technical requirements, test method, inspection rules, and packaging, marking and quality certificate of hot-rolled bulb flats.

This standard is applicable to the hot-rolled asymmetric bulb flats used in shipbuilding, offshore engineering and steel structure, etc.

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 molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy - Determination of aluminum content - Chrome azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric 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 223.19 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 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.54 Methods for chemical analysis of iron, steel and alloy - Flame atomic absorption spectrometric method for the determination of copper 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 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-volumetric method after combustion in the pipe furnace
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low - Alloy steel (Routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
YB/T 081 Rule for rounding off of numberical values and judgement of testing values for technical standards of metallurgy

3 Order information

The contract or order made according to this standard shall cover the following contents:

a) Standard No.;

b) Product name;

c) Grade;

d) Delivery status;

e) Model and length;

f) Weight.

4 Model, dimension, shape, weight and permissible tolerance

4.1 Dimension

4.1.1 Sectional dimension and allowable deviation

4.1.1.1 The sectional diagram and annotation symbols of the bulb flats are shown in Figure 1.

Foreword i
1 Scope
2 Normative references
3 Order information
4 Model, dimension, shape, weight and permissible tolerance
5 Technical requirements
6 Test method
7 Inspection rules
8 Packaging, marking and quality certification