GB/T 17107-2025 PDF English
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GB/T 17107: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 17107-2025 | 425 | Add to Cart | Auto, 9 seconds. | Structural steel bars for forgings | Valid |
| GB/T 17107-1997 | 130 | Add to Cart | Auto, 9 seconds. | Structural steel grades and mechanical property for forgings |
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GB/T 17107-2025: Structural steel bars for forgings
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17107-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 CCS H 40 Replacing GB/T 17107-1997, GB/T 32289-2015 Structural steel bars for forgings Issued on: OCTOBER 31, 2025 Implemented on: MAY 01, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Classification... 7 5 Ordering contents... 7 6 Manufacturing process... 8 6.1 Smelting methods... 8 6.2 Forging ratio... 8 6.3 Delivery status... 9 7 Technical requirements... 10 7.1 Designation and chemical composition... 10 7.2 Mechanical properties... 12 7.3 Low magnification... 19 7.4 Non-metallic inclusions... 20 7.5 Grain size... 20 7.6 Ultrasonic testing... 21 7.7 Hot upsetting... 22 7.8 Surface quality... 22 7.9 Dimensions, shape, and weight... 22 7.10 Special requirements... 22 8 Test methods... 23 9 Inspection rules... 24 9.1 Inspection and acceptance... 24 9.2 Batching rules... 24 9.3 Sampling quantity and sampling site... 25 9.4 Re-inspection and judgment rules... 25 10 Packaging, marks and quality certificate... 25 Annex A (normative) Chemical composition of 17Cr2Ni2Mo steel... 26 Annex B (informative) Comparison of designations in this document with similar designations in foreign standards... 27 Annex C (informative) Recommended heat treatment system... 30 Annex D (informative) Sampling location for testing the mechanical properties of forgings... 32 Bibliography... 35 Structural steel bars for forgings1 Scope
This document specifies the classification, ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marks, and quality certificate for high-quality carbon structural steel and alloy structural steel forgings. 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 metallurgical, mining, shipbuilding, and engineering machinery equipment, where mechanical properties are measured after overall 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), 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 for 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, Method for ultrasonic testing of forged and rolled steel bars GB/T 4336, Carbon and low-alloy steel - Determination of multielement contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 6394, Determination of estimating the average grain size of metal 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 and expression and judgement 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 specimens GB/T 17505, Steel and steel products -- General technical delivery requirements GB/T 20066, Steel and iron -- Sampling and preparation of specimens 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 -- Test method for upsetting3 Terms and definitions
This document does not contain any terms or definitions that need to be defined.4 Classification
4.1 Steel bars are classified into the following 3 categories according to metallurgical quality. a) High-quality steel; b) High-grade high-quality steel (with "A" added after the designation); c) Extra-high-quality steel (with "E" added after the designation). 4.2 Steel bars are classified into the following 3 categories according to their surface delivery condition. a) Hot forging; b) Polished; c) Machining. 4.3 Steel bars are classified into the following 5 categories according to their heat treatment state. a) Annealing; b) High-temperature tempering; c) Normalizing; d) Normalizing + tempering; e) Quenching + tempering (including quenching and tempering). 4.4 Steel bars are classified into the following 2 categories according to their processing methods. a) Steel for pressure processing; b) Steel for cutting processing.5 Ordering contents
The contract or order for the goods placed in this document shall include the following. a) Reference to this document; b) Product name; c) Designation; d) Smelting method; e) Delivery weight (or quantity); f) Dimensions, shape and permissible deviations; g) Processing method (unless otherwise specified, as for steel suitable for machining); h) Delivery condition; i) Mechanical properties (if any); j) Magnification; k) Non-metallic inclusions (if any); l) Grain size (if any); m) Special requirements.6 Manufacturing process
6.1 Smelting methods Unless otherwise specified in the contract, steel is usually smelted in an electric furnace or converter and then refined outside the furnace. 6.2 Forging ratio 6.2.1 Steel bars The steel bars shall be forged on a forging press with sufficient capacity. The forging ratio shall conform to the following requirements. a) Steel bars used for heat pressure processing shall have a forging ratio of not less than 2.0; b) Steel bars that have undergone intermediate upsetting shall have a forging ratio of not less than 2.5; c) Steel bars used for cutting processing shall have a forging ratio of not less than 3.0. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
