GB/T 17107-2025 Structural steel bars for forgings English, Anglais, Englisch, Inglés, えいご
1 Scope
This document specifies the classification, ordering contents, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for forged steel bars made of quality carbon structure steels and alloy structure steels for forgings.
This document is applicable to forged round steel with a nominal diameter not exceeding 1500 mm, forged square steel with a nominal side length not exceeding 1300 mm, and forged flat steel with a nominal thickness not exceeding 1000 mm and a nominal width not exceeding 1700 mm.
This document is also applicable to general forgings in equipment such as metallurgy, mining, shipbuilding, and engineering machinery, whose mechanical properties are determined by sampling after integral heat treatment.
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 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy
GB/T 224 Determination of the depth of decarburization of steels
GB/T 225 Steel - Hardenability test by end quenching (Jominy test)
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 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 699 Quality carbon structure steels
GB/T 908 Forged bars - Dimensions, shape, weight and tolerances
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 3077 Alloy structure steels
GB/T 4162-2022 Forged and rolled steel bars - Method for ultrasonic 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 Metal-methods for estimating the average grain size
GB/T 6402-2024 Method for ultrasonic testing of steel forgings
GB/T 7736 Ultrasonic inspecting method for macro-structure and imperfection of steel
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10561 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Determination of free cementite, pearlite and Widmanstaten structure in steel
GB/T 15711 Inspection of non-metallic inclusions of steel - Etching test method of tower samples
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)
YB/T 5293 Metallic materials - Forging test
3 Terms and definitions
No terms and definitions are defined in this document.
4 Classification
4.1 Steel bars are classified into 3 categories by metallurgical quality:
a) quality steel;
b) high-quality steel (marked with suffix "A" after the grade);
c) Super high-quality steel (marked with suffix "E" after the grade).
4.2 Steel bars are classified into 3 categories by surface delivery condition:
a) hot forged;
b) ground;
c) machined.
4.3 Steel bars are classified into 5 categories by heat treatment condition:
a) annealed;
b) high-temperature tempered;
c) normalized;
d) normalized + tempered;
e) quenched + tempered (including quenched and high-temperature tempered).
4.4 Steel bars are classified into 2 categories by processing method:
a) steel for pressure working;
b) steel for cutting.
5 Ordering contents
Contracts or orders made based on this document should cover the following information:
a) No. of this document;
b) product name;
c) grade;
d) smelting method;
e) delivery weight (or quantity);
f) dimension, shape and permissible deviation;
f) use and processing methods (deemed as steel for cutting unless otherwise indicated);
h) delivery state;
i) mechanical properties (if any);
j) macrostructure;
k) non-metallic inclusions (if any);
l) grain size (if any);
m) special requirements.
6 Manufacturing processes
6.1 Smelting method
Unless otherwise specified in the contract, the steel is normally smelted by electric furnace or converter, followed by secondary refining.
6.2 Forging ratio
6.2.1 Steel bars
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Ordering contents
6 Manufacturing processes
6.1 Smelting method
6.2 Forging ratio
6.3 Delivery condition
7 Technical requirements
7.1 Grade and chemical composition
7.2 Mechanical properties
7.3 Macrostructure
7.4 Nonmetallic inclusions
7.5 Grain size
7.6 Ultrasonic testing
7.7 Hot upset
7.8 Surface quality
7.9 Dimension, shape and weight
7.10 Special requirements
8 Test methods
9 Inspection rules
9.1 Inspection and acceptance
9.2 Batching rules
9.3 Sampling quantity and sampling position
9.4 Reinspection and judgment rules
10 Packaging, marking and quality certificate
Annex A (Normative) Chemical compositions of 17Cr2Ni2Mo steel
Annex B (Informative) Comparison table of the grades of this document and the corresponding grades of foreign standards
Annex C (Informative) Recommended heat treatment system
Annex D (Informative) Sampling locations for test specimens used in mechanical property tests of forgings
Bibliography
Standard
GB/T 17107-2025 Structural steel bars for forgings (English)
GB/T 17107-2025 Structural steel bars for forgings English, Anglais, Englisch, Inglés, えいご
1 Scope
This document specifies the classification, ordering contents, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for forged steel bars made of quality carbon structure steels and alloy structure steels for forgings.
This document is applicable to forged round steel with a nominal diameter not exceeding 1500 mm, forged square steel with a nominal side length not exceeding 1300 mm, and forged flat steel with a nominal thickness not exceeding 1000 mm and a nominal width not exceeding 1700 mm.
This document is also applicable to general forgings in equipment such as metallurgy, mining, shipbuilding, and engineering machinery, whose mechanical properties are determined by sampling after integral heat treatment.
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 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy
GB/T 224 Determination of the depth of decarburization of steels
GB/T 225 Steel - Hardenability test by end quenching (Jominy test)
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 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 699 Quality carbon structure steels
GB/T 908 Forged bars - Dimensions, shape, weight and tolerances
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 3077 Alloy structure steels
GB/T 4162-2022 Forged and rolled steel bars - Method for ultrasonic 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 Metal-methods for estimating the average grain size
GB/T 6402-2024 Method for ultrasonic testing of steel forgings
GB/T 7736 Ultrasonic inspecting method for macro-structure and imperfection of steel
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10561 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Determination of free cementite, pearlite and Widmanstaten structure in steel
GB/T 15711 Inspection of non-metallic inclusions of steel - Etching test method of tower samples
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)
YB/T 5293 Metallic materials - Forging test
3 Terms and definitions
No terms and definitions are defined in this document.
4 Classification
4.1 Steel bars are classified into 3 categories by metallurgical quality:
a) quality steel;
b) high-quality steel (marked with suffix "A" after the grade);
c) Super high-quality steel (marked with suffix "E" after the grade).
4.2 Steel bars are classified into 3 categories by surface delivery condition:
a) hot forged;
b) ground;
c) machined.
4.3 Steel bars are classified into 5 categories by heat treatment condition:
a) annealed;
b) high-temperature tempered;
c) normalized;
d) normalized + tempered;
e) quenched + tempered (including quenched and high-temperature tempered).
4.4 Steel bars are classified into 2 categories by processing method:
a) steel for pressure working;
b) steel for cutting.
5 Ordering contents
Contracts or orders made based on this document should cover the following information:
a) No. of this document;
b) product name;
c) grade;
d) smelting method;
e) delivery weight (or quantity);
f) dimension, shape and permissible deviation;
f) use and processing methods (deemed as steel for cutting unless otherwise indicated);
h) delivery state;
i) mechanical properties (if any);
j) macrostructure;
k) non-metallic inclusions (if any);
l) grain size (if any);
m) special requirements.
6 Manufacturing processes
6.1 Smelting method
Unless otherwise specified in the contract, the steel is normally smelted by electric furnace or converter, followed by secondary refining.
6.2 Forging ratio
6.2.1 Steel bars
Contents of GB/T 17107-2025
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Ordering contents
6 Manufacturing processes
6.1 Smelting method
6.2 Forging ratio
6.3 Delivery condition
7 Technical requirements
7.1 Grade and chemical composition
7.2 Mechanical properties
7.3 Macrostructure
7.4 Nonmetallic inclusions
7.5 Grain size
7.6 Ultrasonic testing
7.7 Hot upset
7.8 Surface quality
7.9 Dimension, shape and weight
7.10 Special requirements
8 Test methods
9 Inspection rules
9.1 Inspection and acceptance
9.2 Batching rules
9.3 Sampling quantity and sampling position
9.4 Reinspection and judgment rules
10 Packaging, marking and quality certificate
Annex A (Normative) Chemical compositions of 17Cr2Ni2Mo steel
Annex B (Informative) Comparison table of the grades of this document and the corresponding grades of foreign standards
Annex C (Informative) Recommended heat treatment system
Annex D (Informative) Sampling locations for test specimens used in mechanical property tests of forgings
Bibliography
