GB/T 17107-2025 Structural steel bars for forgings English, Anglais, Englisch, Inglés, えいご
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ICS 13.220
CCS H 57
National Standard of the People's Republic of China
GB/T 17107-2025
Replaces GB/T 17107-1997
Structural steel bars for forgings
锻件用结构钢棒
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification
5 Order Content
6 Manufacturing Processes
6.1 Steelmaking Method
6.2 Forging Ratio
6.3 Delivery Condition
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Packaging, Marking and Quality Certificate
Appendix A (Normative) Chemical Composition of 17Cr2Ni2Mo Steel
Appendix B (Informative) Comparison of Grades in This Document with Similar Grades in Foreign Standards
Appendix C (Informative) Recommended Heat Treatment Systems
Appendix D (Informative) Sampling Locations for Mechanical Property Testing of Forgings
References
1 Scope
This document specifies the classification, order content, manufacturing processes, technical requirements, test methods, inspection rules, and packaging, marking, and quality certificates for high-quality carbon structural steel and alloy structural steel forged steel bars.
This document applies to forged round steel with a nominal diameter not exceeding 1,500 mm, forged square steel with a nominal side length not exceeding 1,300 mm, and forged flat steel with a nominal thickness not exceeding 1,000 mm and a nominal width not exceeding 1,700 mm.
This document also applies to general forgings used in equipment such as metallurgy, mining, ships, and engineering machinery, from which samples are taken after overall heat treatment to determine mechanical properties.
2 Normative References
The contents of the following documents, through normative citations in this document, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (all parts) Methods for chemical analysis of iron and steel
GB/T 224 Method for determination of decarburized layer depth in steel
GB/T 225 Jominy end-quench test method for hardenability of steel
GB/T 226 Macro-etch test method for steel
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
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 699 High-quality carbon structural steel
GB/T 908 Dimensions, shape, weight, and tolerances for forged steel bars
GB/T 1979 Rating charts for macro-structure defects in structural steel
GB/T 2101 General rules for inspection, packaging, marking, and quality certificates for section steel
GB/T 3077 Alloy structural steel
GB/T 4162-2022 Ultrasonic testing method for forged and rolled steel bars
GB/T 4336 Carbon and medium-low alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Standard test method for determining the average grain size of metals
GB/T 6402-2024 Ultrasonic testing method for steel forgings
GB/T 7736 Ultrasonic testing method for macro-defects in steel
GB/T 8170-2008 Rules for rounding off numerical values and expression and judgment of limiting values
GB/T 10561 Steel - Determination of the content of non-metallic inclusions - Standard chart method for microscopic evaluation
GB/T 13298 Metallic materials - Macro-etch test method
GB/T 13299 Steel - Evaluation of free cementite, pearlite, and widmanstatten structure
GB/T 15711 Steel - Test for non-metallic inclusions - Tapered hairline acid etching method
GB/T 17505 Steel and steel products - General technical requirements for delivery
GB/T 20066 Steel and iron - Sampling and sample preparation for chemical analysis
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - High-frequency induction furnace combustion infrared absorption method (routine method)
YB/T 5293 Metallic materials - Upset test method
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document.
4 Classification
4.1 Steel bars are classified into the following three categories based on metallurgical quality:
a) High-quality steel;
b) Premium quality steel (designated by adding "A" after the grade);
c) Special premium quality steel (designated by adding "E" after the grade).
4.2 Steel bars are classified into the following three categories based on surface delivery condition:
a) Hot forged;
b) Ground;
c) Machined.
4.3 Steel bars are classified into the following five categories based on heat treatment condition:
a) Annealed;
b) High-temperature tempered;
c) Normalized;
d) Normalized and tempered;
e) Quenched and tempered (including quenched and tempered).
4.4 Steel bars are classified into the following two categories based on intended processing method:
a) Pressure processing steel;
b) Cutting processing steel.
5 Order Content
The contract or order for the supply of products under this document should include the following:
a) This document number;
b) Product name;
c) Grade;
d) Steelmaking method;
e) Delivery weight (or quantity);
f) Dimensions, shape, and tolerances;
g) Intended processing method (if not specified, cutting processing steel shall apply);
h) Delivery condition;
i) Mechanical properties (if any);
j) Macro-structure;
k) Non-metallic inclusions (if any).
