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GB/T 24174-2022 English PDF (GB/T 24174-2009)

GB/T 24174-2022_English: PDF (GB/T24174-2022)
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GB/T 24174-2022English185 Add to Cart 0--9 seconds. Auto-delivery Steel -- Determination of Bake-Hardening-Index (BH) Valid GB/T 24174-2022
GB/T 24174-2009English239 Add to Cart 2 days [Need to translate] Steel -- Determination of Bake-Hardening-Index (BH2) Obsolete GB/T 24174-2009


BASIC DATA
Standard ID GB/T 24174-2022 (GB/T24174-2022)
Description (Translated English) Steel -- Determination of Bake-Hardening-Index (BH)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H22
Classification of International Standard 77.040.10
Word Count Estimation 9,927
Date of Issue 2022-04-15
Date of Implementation 2022-11-01
Drafting Organization Baoshan Iron and Steel Co., Ltd., Zhejiang Special Equipment Research Institute, National Steel and Product Quality Inspection and Testing Center, Shenzhen Wanshi Testing Equipment Co., Ltd., Shougang Group Co., Ltd., Metallurgical Industry Information Standards Research Institute, FAW-Volkswagen Automobile Co., Ltd., Anhui Jianghuai Automobile Group Co., Ltd.
Administrative Organization National Steel Standardization Technical Committee (SAC/TC 183)
Proposing organization China Iron and Steel Association
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration

BASIC DATA
Standard ID GB/T 24174-2009 (GB/T24174-2009)
Description (Translated English) Steel. Determination of Bake-Hardening-Index (BH2)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H22
Classification of International Standard 77.040.10
Word Count Estimation 5,592
Date of Issue 2009-06-25
Date of Implementation 2010-04-01
Adopted Standard EN 10325-2006, NEQ
Drafting Organization Baoshan Iron & Steel Co., Ltd.
Administrative Organization National Steel Standardization Technical Committee
Regulation (derived from) National Standard Approval Announcement 2009 No.9 (Total No.149)
Proposing organization China Iron and Steel Association
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the terms and definitions bake hardening steels value, principle, test report, test procedure, specimens, test equipment. This standard applies to have a bake hardening steel.


GB/T 24174-2022 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.10 CCS H 22 Replacing GB/T 24174-2009 Steel - Determination of Bake-Hardening-Index (BH) ISSUED ON: APRIL 15, 2022 IMPLEMENTED ON: NOVEMBER 01, 2022 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 ... 5 4 Symbols and descriptions ... 5 5 Principle ... 6 6 Test equipment ... 7 7 Specimens ... 7 8 Test methods ... 7 9 Calculation of test results ... 9 10 Test report ... 13 Steel - Determination of Bake-Hardening-Index (BH) 1 Scope This Standard specifies the principle, test equipment, specimens, test methods, calculation of test results and test reports for the determination of the Bake-Hardening- Index (BH) of steel. This Standard applies to the determination of the Bake-Hardening-Index of steels with bake hardening phenomena. NOTE: This Standard is mainly used in the automotive industry. 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 228.1-2021, Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values 3 Terms and definitions For the purposes of this document, the terms and definitions defined in GB/T 228.1- 2021 as well as the followings apply. 3.1 Bake-Hardening-Index; BH The increase in yield strength of the specimens pre-stretched with or without the specified amount of strain after baking at 170°C for 20min relative to the yield strength of the same or another specimen in the original state. 4 Symbols and descriptions The symbols given in Table 1 apply to this document. 6 Test equipment 6.1 The accuracy requirements of the tensile testing machine and extensometer are in accordance with the provisions of GB/T 228.1-2021. 6.2 The temperature control accuracy of the heating device is ±2°C. The resolution of the temperature measuring device shall not exceed 1°C. 7 Specimens The specimen shall use the P5, P6 and P17 lead specimens in Annex B of GB/T 228.1- 2021. When the product standard or contract does not specify the specimen type number, the P17 specimen shall be used. 8 Test methods 8.1 Test classification According to the number of specimens used in the test, the test methods are divided into two categories. a) Use a specimen to determine. According to the difference of determination methods, it is divided into BH2, BH2H, BH2L and BH2P. When the product standard or contract does not stipulate, BH2 shall be used. b) Use two specimens to determine. Use BH0 to express. 8.2 Test conditions 8.2.1 Test temperature Unless otherwise specified, the test shall be carried out at room temperature within the range of 10℃ ~ 35℃. For tests with strict temperature requirements, the test temperature shall be 23°C ± 5°C. 8.2.2 Tensile test rate 8.2.2.1 To better maintain the consistency of test results, a uniform tensile test rate shall be used. 8.2.2.2 When measuring Rt2.0, Rp2.0, Rp0.2, Rp0.2,t, ReL and ReL,t, it is recommended to set the test rate according to the beam displacement rate of 5%Lc per minute. When measuring ReH,t, it is recommended to set the test rate according to the beam displacement rate of 2.5% Lc per minute. The test rate shall not be switched from the start of the stretch to the measurement of the above indicators. 8.2.3 Baking treatment 8.2.3.1 After the temperature of the heating device reaches 170°C, put the specimen to be baked. After the temperature of the heating device reaches 170°C again, keep the temperature for (20.0±0.5) min. Take out the specimen immediately. Place in air to cool to room temperature. 8.2.3.2 During baking, the specimens shall not be stacked. They shall be placed separately on the shelf. 8.2.3.3 The same tensile testing machine shall be used for the two tensile tests before and after baking. 8.3 Determination methods 8.3.1 Determination of BH2 Use a tensile test specimen. According to the provisions of GB/T 228.1-2021, the specimen is first subjected to pre-strain stretching with a total strain of 2.0%. Obtain Rt2.0. After the pre-tensile specimen is subjected to the prescribed baking treatment, the tensile test is performed on the sample again. Obtain ReL,t or Rp0.2,t (when there is no apparent yield). 8.3.2 Determination of BH2H Use a tensile test specimen. In accordance with the provisions of GB/T 228.1-2021, the specimen is first subjected to pre-strain stretching with a total strain of 2.0%. Obtain Rt2.0. After the pre-tensile specimen is subjected to the prescribed baking treatment, the tensile test is performed on the specimen again. Obtain ReH,t or Rp0.2,t (when there is no apparent yield). 8.3.3 Determination of BH2L Use a tensile test specimen. According to the provisions of GB/T 228.1-2021, the specimen is first subjected to pre-strain stretching with a total strain of 2.0%. Obtain Rp0.2. After the pre-tensile specimen is subjected to the prescribed baking treatment, the tensile test is performed on the specimen again. Obtain ReL,t or Rp0.2,t (when there is no apparent yield). 8.3.4 Determination of BH2P Use a tensile test specimen. According to the provisions of GB/T 228.1-2021, the specimen is first subjected to pre-strain stretching with a total strain of 2.2%. Obtain Rp2.0. After the pre-tensile specimen is subjected to the prescribed baking treatment, the tensile test is performed on the specimen again. Obtain ReL,t or Rp0.2,t (when there is no apparent yield). NOTE: For high strength steel, the total strain corresponding to Rp2.0 may be greater than 2.2%. At ......


GB/T 24174-2009 Steel. Determination of Bake-Hardening-Index (BH2) ICS 77.040.10 H22 National Standards of People's Republic of China Steel bake hardening value (BH2) measurement method Posted 2009-06-25 2010-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Foreword This standard EN10325.2006 "to increase the amount of the yield strength of steel by the effect caused by heat treatment (bake hardening value) measured" consistent The degree of non-equivalent. The standard proposed by China Iron and Steel Association. This standard is under the jurisdiction of the National Steel Standardization Technical Committee. This standard was drafted. Baoshan Iron & Steel Co., Ltd., Shougang Corporation. The main drafters of this standard. Li Heping, Zhou Xing, Li Jianlong, Wu Zhaohui. Steel bake hardening value (BH2) measurement method 1 Scope This standard specifies the value of bake hardening steel (BH2) terms and definitions, principle, test equipment, samples, test procedures, test report. This standard is applicable to the bake hardening steel. Note. This standard is mainly used in the automotive industry. 2 Normative references The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 228 metal materials at room temperature tensile test method (GB/T 228-2002, eqvISO 6892.1998) GB/T 8170 repair value expressed about the rules and limit values \u200b\u200band judgment 3 Terms and Definitions GB/T 228 as well as established the following terms and definitions apply to this standard. 3.1 BH2 Bake hardening values \u200b\u200b(the BH2) is pre-stretched 2.0% total strain in a sample at a temperature of 170 ℃ bake yield strength after 20min (ReL, t) with respect to the original state of the sample yield strength (Rt2.0) value added. 2.0% of the total pre-stretched to simulate stamping strain should Changing, and 170 ℃ baking 20min to simulate baking after painting. 4 Symbols and Symbols used in this standard and are described in Table 1. Table 1 Symbols and Symbol Unit Description Specimens Rt2.0 MPa stress to total strain of 2.0% Rp0.2, t MPa sample was 2.0% strain and after baking, the corresponding plastic strain of 0.2% when stress (when no significant yield) ReL, t MPa sample was 2.0% and after baking under strain measured yield strength BH2 MPa bake hardening value Principle 5 Increase the strength of the sample after the heat treatment of 2.0% of pre-deformation and a predetermined yield determined bake hardening value. 6 Test Equipment Tensile testing machine in accordance with the requirements of GB/T 228 requirements. 7 samples The specimen shall comply with GB/T 228's. ......

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