1. Scope
This part specifies the definition, type, grade, purchasing content, dimension, shape, or weight tolerance, technical specification, testing method, test rules, packing, sign and certificate of quality of the hot rolled ribbed bars of reinforced concrete.
This part is applicable to the general hot rolled ribbed bars for the reinforcement of concrete, and hot rolled ribbed bar with ultra-fine grain.
This part is inapplicable to the recycling steel bar re-rolled by the rolled-steel final product, and remained heat treatment ribbed bars
2. Normative references
The following provisions contain provisions which, through reference in this text, constitute provisions of this Part. For dated reference, subsequent amendments to, or revisions of (excluding corrigendum contents), or Revised Edition do not apply. However, it is encouraged that every part of this Part to research the latest edition of these documents. 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 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy-The Ammonium Persulfate Oxidation Volumetric Method for the Determination of Chromium Content
GB/T 223.12 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 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy-The Diantipyrylmethane 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 Methods for Chemical Analysis of Iron, Steel and Alloy-The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.26 Methods for Chemical Analysis of Iron Steel and Alloy-The Thiocyanate Direct Photometric Method for the Determination of Molybderum Content
GB/T 223.27 Methods for Chemical Analysis of Iron, Steel and Alloy-The Thiocyanate-butyl Acetate Extraction Spectrophotometric Method for the Determination of Molybdenum Content
GB/T 223.37 Methods for Chemical Analysis of Iron Steel and Alloy-The Indophenal Blue Photometric Methods for the Determination of Nitrogen Content after Distillation Separation
GB/T 223.40 Iron, Steel and Alloy-Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
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
Contents
Foreword I
1. Scope
2. Normative references
3. Definitions
4. Types and grades
5. Order content
6. Dimension, shape weight and tolerance
6.1 Nominal diameter scope and recommend diameter
6.2 Nominal cross-sectional area and theoretical weight
6.3 Surface configuration and dimension tolerance of ribbed bar
6.4 Length and length tolerance
6.5 Bend degree and tip
6.6 Weight and weight tolerance
7. Specifications
7.1 Grade and chemical composition
7.2 Delivery way
7.3 Mechanical property
7.4 Processing property
7.5 Fatigue property
7.6 Welding property
7.7 Grain size
7.8 Surface quality
8. Testing Method
8.1 Testing items
8.2 Tensile, bending and reverse bend test
8.3 Dimension Measurement
8.4 Measurement of weight tolerance
9. Test Rules
9.1 Characteristic value check
9.2 Delivery survey
10. Packaging, marking and quality certificate
Annex A (Normative) Measuring Method of Steel Bar under General Maximum Force Extensibility
Annex B (Normative) Test Rules of Characteristic Value
Annex C (Informative) Design Formula of Specific Projected Rib Area of Steel Bar
