GB/T 24595-2025 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24595-2025	279	Add to Cart	3 days	Hot-rolled steel bars for quenched and tempered crankshafts
GB/T 24595-2020	145	Add to Cart	Auto, < 3 mins	Hot-rolled steel bars for quenched and tempered automobile crankshafts	Valid
GB/T 24595-2009	439	Add to Cart	3 days	Steel bar for quenched and tempered automotive crankshaft	Obsolete

Basic data

Standard ID: GB/T 24595-2025 (GB/T24595-2025)
Description (Translated English): Hot-rolled steel bars for quenched and tempered crankshafts
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H54
Classification of International Standard: 77.140.60
Word Count Estimation: 14,173
Date of Issue: 2025-10-31
Date of Implementation: 2026-05-01
Older Standard (superseded by this standard): GB/T 24595-2020
Issuing agency(ies): State Administration for Market Regulation and Standardization Administration of China

GB/T 24595-2025: Hot-rolled steel bars for quenched and tempered crankshafts

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ICS 77.140.60 CCSH54 National Standards of the People's Republic of China Replaces GB/T 24595-2020 Hot-rolled steel bars for tempered crankshafts Published on 2025-10-31 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 24595-2020 "Hot-rolled steel bars for automotive quenched and tempered crankshafts". Compared with GB/T 24595-2020, except for the structure... The adjustments and editorial changes, and the main technical changes are as follows. a) The scope of application has been changed (see Chapter 1, Chapter 1 of the 2020 edition); b) Added requirements for cut angle (see 6.11.3); c) Four grades, 35CrMo, 35CrMoS, 42CrMoNiV, and 34Cr2Ni2Mo, and their technical requirements have been added (see 6.1.1); d) The delivery status has been changed (see 5.3, 2020 version 5.3); e) Increased hardness for annealed delivery (see 6.2); f) The hardenability requirements have been changed (see 6.4, 5.5 in the 2020 edition); g) The requirements for low-magnification structures have been changed (see 6.5, 5.6 in the 2020 edition); h) The requirements for non-metallic inclusions have been changed (see 6.6, 5.7 of the 2020 edition); i) The requirements for banded tissue have been changed (see 6.8, 5.9 in the 2020 edition). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This document was drafted by. Jiangyin Xingcheng Special Steel Co., Ltd., Daye Special Steel Co., Ltd., and Panzhihua Iron and Steel Group Jiangyou Great Wall Special Steel Co., Ltd. Limited Liability Company, Qingdao Special Steel Co., Ltd., Benxi Steel Plate Co., Ltd., Metallurgical Industry Information and Standardization Research Institute, Nanjing Iron & Steel Co., Ltd. The company, Chengde Jianlong Special Steel Co., Ltd., Jiangsu Shagang Group Huaigang Special Steel Co., Ltd., and Linyi Iron & Steel Investment Group Special Steel Co., Ltd. Company, Lingyuan Iron & Steel Co., Ltd. The main drafters of this document are. Li Bing, Sun Hongping, Ou Rong, Liu Deng, Chang Zhigang, Meng Yu, Qi Feng, Wang Xinhe, Zhou Lei, Wang Xueyuan, and Zuo Hui. Li Pengchao, Jiang Zhensheng, Zhang Quanquan, Hu Mengdi, Huang Hua, Zhu Min, Huang Jianguo, Yan Chengming, Lu Mingxia, Li Haiyang, Jiang Caiyan, Jiang Dongchu, Liu Lei You Dajun and Xiao Liqiang. This document was first published in.2009, revised for the first time in 2020, and this is the second revision. Hot-rolled steel bars for tempered crankshafts

1 Scope

This document specifies the ordering details, manufacturing process, technical requirements, test methods, inspection rules, and packaging for hot-rolled steel bars used in quenched and tempered crankshafts. Marks and quality certificates. This document applies to hot-rolled steel bars (hereinafter referred to as steel bars) for quenched and tempered crankshafts with a nominal diameter not exceeding 260 mm.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 222 Permissible deviations in the chemical composition of finished steel GB/T 223 (all parts) Chemical Analysis Methods for Iron and Steel and Alloys GB/T 225 Steel Hardenability Test Method for End Quenching (Jominy Test) GB/T 226 Steel - Low-magnification microstructure and defect testing method using acid etching GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 229 Metallic materials Charpy impact test method GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method GB/T 702-2017 Dimensions, shape, weight and permissible deviations of hot-rolled steel bars GB/T 1979 Low-magnification microstructure defect rating diagram for structural steel GB/T 2101 General Provisions for Acceptance, Packaging, Marking and Quality Certificate of Section Steel GB/T 2975 Sampling Location and Specimen Preparation for Mechanical Property Testing of Steel and Steel Products GB/T 4162-2022 Ultrasonic Testing Method for Forged and Rolled Steel Bars GB/T 4336 Determination of Multi-Element Content in Carbon Steel and Medium-Low Alloy Steels by Spark Discharge Atomic Emission Spectrometry (Conventional Method) GB/T 6394 Method for Determination of Average Grain Size of Metals GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values GB/T 10561-2023 Standard rating chart microscopic examination method for the determination of non-metallic inclusion content in steel GB/T 11261 Determination of Oxygen Content in Iron and Steel - Pulse Heating Inert Gas Melting-Infrared Absorption Method GB/T 17505 General technical requirements for delivery of steel and steel products GB/T 20066 Sampling and Sample Preparation Methods for the Determination of Chemical Composition of Steel and Iron GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel - Infrared Absorption Method After Combustion in a High-Frequency Induction Furnace (Conventional Method) GB/T 34474.1 Evaluation of banded structure in steel - Part 1.Standard rating chart method

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. ......

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