1 Scope
This part specifies terms, definitions, classification, trademark, ordering content, dimension, shape, weight, allowable deviation, technical requirements, test method, test rules, packing, marking and quality certificate of hot rolled plain bars for reinforcement steel concrete.
This part is applicable to hot rolled vertical bar, reinforcement concrete and pony roll plain bar for reinforcement concrete.
This part is not applicable to secondary steel bar rolled by final steel.
2 Normative references
The following articles/items which, through reference in this part of GB 1499, constitute provisions of this part: for dated reference, subsequent amendments to, or revisions of any of these publications do not apply; for undated references, the latest edition of the normative document referred to applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
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 223.12 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 223.19 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 Methods for Chemical Analysis of Iron, Steel and Alloy--The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel 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 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy--The Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content
GB/T 223.68 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 Methods for Chemical Analysis of Iron, Steel and Alloy--The Gas-volumetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content
GB/T Metallic Materials--Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998)
Contents
1 Scope
2 Normative references
3 Terms and definitions
3.1 Hot rolled plain bars
3.2 Characteristic value
4 Classification and grade
4.1 Reinforcements are divided into grade 235 and grade 300 according to characteristic value of yield strength.
4.2 See Table 1 for the compositions and Connotations of reinforcements' grade.
5 Contract for goods
6 Dimension, shape, weight and allowable deviation
6.1 Scope and recommended diameter of the nominal diameter
6.2 Nominal cross-sectional area and theoretical weight
6.3 Cross-sectional shape and dimensional allowable deviation of plain bars
6.4 Length and allowable deviation
6.5 Tortuosity and end
6.6 Weight and its allowable deviation
7 Technical requirements
7.1 Grades and chemical compositions
7.2 Smelting process
7.3 Mechanical property and technical property
7.4 Surface quality
8 Test methods
8.1 Testing items
8.2 Mechanical properties and technical property test
8.3 Dimensional measurement
8.4 Measurement of weight deviation
8.5 Round-off and determination for the test result value shall be in accordance with those specified in YB/T 081.
9 Test rules
9.1 Characteristic value test
9.2 Delivery inspection
10 Package, marking and quality certificate
Annex A (Normative) Measuring Method for Total Tensile Stretch of Reinforcement under Maximal Force
A.1 Sample
A.2 Tensile test
A.3 Post-fracture measurement
Annex B (Normative) Test Rules of Characteristic Value
B.1 Batch forming in test
B.2 Sampling quantity from each batch
B.3 Assessment of test result
