GB 1499.1-2024 Steel for the reinforcement of concrete - Part 1: Hot rolled plain bars
1 Scope
This document specifies the designations, dimensions, shapes, weights and permissible tolerances, smelting and properties, test methods, inspection rules, packaging, marking and quality certificate for hot rolled plain bars for the reinforcement of concrete (hereinafter referred to as steel bars).
This document is applicable to hot rolled straight or coiled plain bars for the reinforcement of concrete.
This document is not applicable to recycled steel bars that are rolled again from finished steel.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.63 Iron, steel and alloy - Determination of manganese content - Sodium (potassium) periodate spectrophotometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
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 sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
GB/T 28900 Test methods of steel for reinforcement of concrete
YB/T 081 Rule for rounding off of numerical values and judgment of testing values for technical standards of metallurgy
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
hot rolled plain bars
finished steel bars formed by hot rolling, usually round in cross section and with smooth surface
3.2
characteristic value
quantile value corresponding to a specified probability in an infinite number of tests
4 Designation
4.1 The characteristic value of the yield strength of steel bars is Class 300.
4.2 See Table 1 for the composition and meaning of designation for steel bars.
Table 1 Composition and meaning of designation for steel bars
Product name Designation Composition Meaning of English letters
Hot rolled plain bars HPB300 HPB + characteristic value of yield strength HPB——Abbreviation of Hot rolled Plain Bars
5 Dimensions, shapes, weights and permissible tolerances
5.1 Nominal diameter range
The nominal diameter range of the steel bars is from 6mm to 25mm.
5.2 Nominal cross-sectional areas and theoretical unit weights
The nominal cross-sectional areas and theoretical unit weights of steel bars shall be as specified in Table 2.
Table 2 Nominal cross-sectional areas and theoretical unit weights of steel bars
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Designation
5 Dimensions, shapes, weights and permissible tolerances
6 Smelting and properties
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Normative) Inspection rules for characteristic values
