Hot rolled bars of rare earth for reinforcement of concrete
1 Scope
This document specifies the classification and grade, order information, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, and packaging, marking and quality certification of hot rolled bars of rare earth for reinforcement of concrete.
This document applies to hot rolled plain round bars and ribbed bars of rare earth for reinforcement of concrete (hereinafter referred to as steel bars).
2 Normative references
The following documents contain requirements 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 223.14 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 223.37 Iron, steel and alloy - Determination of nitrogen content - Indophenol blue spectrophotometric method after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.49 Methods for chemical analysis of iron, steel and alloy - Extraction separation-chlorophosphonazo mA spectrophotometric method for the determination of the total rare tarth content
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 1499.1 Steel for the reinforcement of concrete - Part 1: Hot rolled plain bars
GB/T 1499.2 Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars
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 10125 Corrosion tests in artificial atmospheres - Salt spray tests
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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
GB/T 22368 Low-alloy steel - Determination of multi-element contents - Glow discharge optical emission spectrometry (Routine method)
GB/T 24520 Cast iron and low alloy steel - Determination of lanthanum, cerium and magnesium content - Inductively coupled plasma atomic emission spectrometric method
GB/T 28900 Test methods of steel for reinforcement of concrete
JGJ 18 Specification for welding and acceptance of reinforcing steel bars
JGJ 107 Technical specification for mechanical splicing of steel reinforcing bars
YB/T 081 Rule for rounding off of numerical values and judgment of testing values for technical standards of metallurgy
YB/T 4367 Steel bars corrosion test method in chloride environment
YB/T 4368 Corrosion test method for steel bars in industrial atmospheric environment
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 1499.1 and GB/T 1499.2 and the following apply.
3.1
hot rolled bar of rare earth
steel bar in which a certain amount of one or more rare earth elements of La, Ce is added to obtain good mechanical properties, corrosion resistance, and delivery in hot rolled condition
4 Classification and designation
4.1 According to the characteristic value of yield strength, steel bars are divided into Grade 300 grades, Grade 400, Grade 500, and Grade 600.
4.2 See Table 1 for the composition and meaning of steel bar grades.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 Order information
6 Dimension, shape, weight and permissible deviation
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and quality certification
