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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 26075-2010 Steel bars for sucker rods. The following main technical changes have been made with respect to GB/T 26075-2010:
——the specification, permissible deviation of nominal diameter and ovality in Table 1 are modified (see 4.1.1; 4.1.1 of Edition 2010);
——the dimension and accuracy requirements of hot-rolled wire rods are added (see 4.1.3);
——two designations, i.e., 30MnNiMoA and 23Ni2MoVA are added (see 5.1.1);
——the reference grades of 25CrMoA and 35CrMoA steel are modified (see 5.1.1; 5.1.1 of Edition 2010);
——the requirements for residual sulfur content are tightened (see 5.1.1; 5.1.1 of Edition 2010);
——the mechanical property requirements of two new designations are added (see 5.4.1);
——the permissible adjustment range of normalizing temperature is added (see 5.4.1);
——the surface quality description of hot-rolled steel bar is modified (see 5.8.1; 5.8.1 of Edition 2010);
——the requirements for coil weight of wire rods are modified (see 8.3; 8.3 of Edition 2010);
——the requirements for Grade HY in Annex A are modified (see Annex A; Annex A of Edition 2010);
——Annex B is added (see Annex B).
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
The previous edition of this standard is as follows:
——GB/T 26075-2010.
Steel bars for sucker rods
1 Scope
This standard specifies order information, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of steel bars for sucker rods.
This standard is applicable to steel bars for hot-rolled and cold-drawn sucker rods (hereinafter referred to as steel bars) or wire rods with the nominal diameter not greater than 70mm.
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 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 - Chrom azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.13 Methods for chemical analysis of iron, steel and alloy－The ammonium ferrous sulfate titration 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 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 223.68 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 Iron steel and alloy - Determination of carbon contents - Gas-volumetric method after combustion in the pipe furnace
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin spectrophotometric method for the determination of boron content
GB/T 224 Determination of depth of decarburization of steel
GB/T 226 Test method for macrostructure and defect of steel by etching
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 702-2017 Hot-rolled steel bars - Dimensions, shape, weight and tolerances
GB/T 905-1994 Dimension, shape, weight and tolerance for cold-drawn round, square and hexagonal steels
GB/T 1979 Standard diagrams for macrostructure and defect of structural steels
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 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
GB/T 11260 Round steel - The inspection method for eddy current test
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Steel - Determination of microstructure
GB/T 14981 Dimension, shape, mass and tolerance for hot-rolled round wire rod
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)
SY/T 5029 Sucker rods
YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy
YB/T 5293 Metallic materials - Forging test
3 Order information
The contract or order made according to this standard shall cover the following contents:
a) No. of this standard;
b) product name;
c) designation;
d) dimension, accuracy grade and shape;
e) specified length;
f) weight (or quantity, coil weight);
g) delivery state;
h) other special requirements.
4 Dimension, shape, weight and permissible deviation
4.1 Diameter, permissible deviation and ovality
4.1.1 The nominal diameter, permissible deviation and ovality of hot-rolled steel bars shall comply with Table 1. The Buyer shall indicate the group, otherwise, the steel bars will be delivered as Group B.
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Table 1 Nominal diameter, permissible deviation and ovality
In mm
4.1.2 For cold-drawn steel bars, the diameter and its permissible deviation shall comply with those specified for the accuracy grade of h11, GB/T 905-1994.
4.1.3 The diameter and accuracy of hot-rolled wire rods shall be implemented in accordance with GB/T 14981. As agreed by the Supplier and the Buyer and indicated in the contract, wire rods with other diameter and accuracy may also be supplied.
4.1.4 As agreed by the Supplier and the Buyer and indicated in the contract, the steel bars or wire rods may be delivered according to other specifications or specific permissible deviations.
4.2 Length and permissible deviation
4.2.1 The steel bars are generally delivered according to the specified length, with the specific length noted in the contract; the permissible deviation of specified delivery length shall be 0~+50mm. Special permissible deviation is indicated in the contract.
4.2.2 As agreed by the Supplier and the Buyer and indicated in the contract, steel bar with insufficient length may be supplied.
4.3 Shape
4.3.1 The curvature of steel bar shall not be greater than 3mm/m.
4.3.2 The ends of steel bar shall be free from flying edge, oblique cutting or flattening that influences its application.
4.4 Weight
The steel products are generally delivered according to the actual weight.
5 Technical requirements
5.1 Designation and chemical composition of steel
5.1.1 The steel designation and chemical composition (smelting analysis) shall meet the requirements of Table 2.
Foreword i
1 Scope
2 Normative references
3 Order information
4 Dimension, shape, weight and permissible deviation
5 Technical requirements
6 Test methods
7 Inspection rules
8 Packaging, marking and quality certificate
Annex A (Informative) Mechanical properties of steel sucker rod and definitions of sucker rod grades
Annex B (Informative) Designations of steels having identical or similar composition with those in this standard
