GB/T 24183-2021 PDF English

GB/T24183-2021 (GBT24183-2021): PDF in English

GB/T 24183-2021 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.10 CCS H 23 GB/T 24183-2021 / ISO 11531:2015 Replacing GB/T 24183-2009 Metallic materials - Sheet and strip - Earing test (ISO 11531:2015, IDT) ISSUED ON: AUGUST 20, 2021 IMPLEMENTED ON: MARCH 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 their meanings ... 5  5 Principle ... 7  6 Test equipment ... 7  7 Test piece ... 8  8 Test procedure ... 8  9 Interpretation of results ... 9  10 Test report ... 10  FOREWORD This document was drafted in accordance with the rules given in GB/T 1.1-2020, “Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents”. This document replaces GB/T 24183-2009 "Metallic materials - Earing test". Compared with GB/T 24183-2009, except for structural adjustment and editorial changes, the main technical changes are as follows: -- Change the description of db; add the symbols and meanings of N ear peaks and N ear valleys (see Chapter 3; Chapter 3 of version 2009); -- Change the requirements in the note of 5.3 to be part of the content of 6.3 of the main text (see 6.3; note of 5.3 of version 2009); -- Change the requirements in the note of 5.4 to be part of the content of 6.4 of the main text (see 6.4; note of 5.4 of version 2009); -- Clarify that the working surface hardness requirements of die, blankholder and punch refer to Vickers hardness (see 6.5); -- Add rounding requirements for ear height expressed as a percentage (see 9.4). This document is equivalent to ISO 11531:2015 “Metallic materials - Sheet and strip - Earing test”. Two chapters – “Normative references” and “Terms and definitions” – are added to this document. The following minimal editorial changes are made to this document: -- Add the index number of “test piece” in Figure 2; -- Add a “Note” to 8.3, supplementing that engine oil can be selected as the lubricant. Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying patents. This document was proposed by China Iron and Steel Industry Association. This document shall be under the jurisdiction of National Technical Committee 183 on Iron and Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this document: Shanghai Customs of the People’s Republic of China, Inspection Center of Industrial Products & Raw Materials, Shanghai Shenli Testing Machine Co., Ltd., Shenzhen Wance Testing Machine Co., Ltd., China Metallic materials - Sheet and strip - Earing test 1 Scope This document specifies a method for determining the ear height of metal sheet and strip after deep drawing. This document applies to metal sheet and strip of nominal thickness of 0.1 mm ~ 3 mm. 2 Normative references There are no normative references in this document. 3 Terms and definitions There are no terms and definitions that need to be defined in this document. 4 Symbols and their meanings The meanings of the symbols used in the earing test are given in Table 1, and illustrated in Figures 1 and 2. .......
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