GB/T 13320-2007 PDF EnglishUS$65.00 · In stock · Download in 9 seconds
GB/T 13320-2007: Metallographic grading atlas and assessing method for steel die forgings Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 13320: Historical versions
Similar standardsGB/T 13320-2007: Metallographic grading atlas and assessing method for steel die 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/GBT13320-2007GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.85 J 32 Replacing GB/T 13320-1991 Metallographic grading atlas and assessing method for steel die forgings Issued on: APRIL 18, 2007 Implemented on: NOVEMBER 01, 2007 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Terms and definitions... 4 3 Grouping and grading of grading atlas... 5 4 Application of grading atlas... 5 5 Sample selection and preparation... 5 6 Assessment of metallographic structure... 6 Appendix A (informative) Example of metallographic structure grading atlas for forgings... 19ForewordThis Standard replaces GB/T 13320-1991, Metallographic grading atlas and assessing method for steel die forgings. Compared with GB/T 13320-1991, the main changes of this Standard are as follows. -- Add terms and definitions, i.e., “isothermal normalization”, “control cooling after forging” process and “effective thickness”; -- Remove the words “automobiles, tractors, general machinery” in the scope of application; -- Cancel the various steel grades listed in Chapter 2 of the original standard; -- Combine the third and fourth groups of grading atlases of the original standard into the third group of grading atlases of this standard, i.e., grading atlas of forgings made of quenched and tempered steel; -- Cancel Subclause 3.2 of the original standard; -- Cancel the words “two representative places may be taken” in 4.1 of the original standard, and replace the preparation of samples by 5.2 of this standard; -- Cancel the method of “can be expressed in half-grade” in 5.1 of the original standard; -- Cancel the descriptions of words such as “part” and “a small amount” in the figures, and use shapes and uniformity to describe the situation instead. Appendix A of this Standard is an informative appendix. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee 74 on Forging of Standardization Administration of China. Drafting organization of this standard. Faw Bharat Forge Co., Ltd. Main drafters of this Standard. Yang Jianjun, Lu Dongyuan, Wang Dewei. The previous versions of the standards which are replaced by this Standard are. -- GB/T 13320-1991. Metallographic grading atlas and assessing method for steel die forgings1 ScopeThis Standard specifies the metallographic grading atlas (hereinafter referred to as grading atlas) and assessing method for steel die forgings. This Standard applies to structural steel die forgings that have been subjected to quenching and tempering, normalizing, isothermal normalization, and control cooling after forging. This Standard is not applicable to the assessment of decarburization, overheating, over- burning and other microstructures of forgings.2 Terms and definitionsThe following terms and definitions are applicable to this Standard. 2.1 isothermal normalization A heat treatment process in which the forging is heated to a temperature higher than Ac3 (or Ac1), kept at that temperature for a period of time, then cooled to a temperature in the pearlite transformation zone and kept isothermally for a period of time to transform the austenite into a pearlite structure, and then cooled in air. 2.2 control cooling after forging A process of controlling the cooling rate of the forging by residual heat so that the forging, after forming, obtains pearlite plus ferrite or bainite structure. 2.3 effective thickness When the wall thickness of different parts of the forging is different, if determining the heating time according to the wall thickness at a certain place can ensure the quality of heat treatment, then the wall thickness at that place is called the effective thickness of the forging.3 Grouping and grading of grading atlasThe grading atlases are divided into the following three groups, each with 8 grades. The first group of grading atlases is shown in Figure 1, which is applicable to forgings of medium carbon structural steel that have been subjected to normalizing and forgings of medium carbon low alloy non-quenched-and-tempered steel that have been subjected to control cooling after forging. The second group of grading atlases is shown in Figure 2, which is applicable to forgings that have been subjected to carburizing steel normalizing, isothermal normalization and control cooling after forging. The third group of grading atlases is shown in Figure 3, which is applicable to forgings made of quenched and tempered steel.4 Application of grading atlas4.1 The qualified grades of various metallographic structures in the grading atlas shall be determined by negotiation between the supplier and the buyer. If there is no agreement, grades 1 ~ 4 are considered qualified. 4.2 If there is any dispute during the grading, the mechanical properties test results can be used as a reference for determination.5 Sample selection and preparation5.1 Determination of sampling location It shall be determined by negotiation between the supplier and the buyer. If there is no agreement, the effective thickness of the forging shall be used as the sampling location. For examples showing sampling locations, see Appendix A (informative). 5.2 Preparation of samples Generally, it shall be determined based on the technical agreement between the supplier and the buyer. If there is no agreement, it shall be determined based on the following principles. 5.2.1 When the effective thickness of the sampling location of the forging is ≤20 mm, one-half of it shall be used as the inspection part. 5.2.2 When the effective thickness of the sampling location of the forging is > 20 mm, samples shall be taken 10 mm from the surface as the inspection part. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 13320-2007 be delivered?Answer: The full copy PDF of English version of GB/T 13320-2007 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 13320-2007_English with my colleagues?Answer: Yes. 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