YB/T 4003-2016 PDF EnglishUS$1465.00 · In stock · Download in 9 seconds
YB/T 4003-2016: Standard diagrams for macrostructure and defect in continuous casting slab Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid YB/T 4003: Historical versions
YB/T 4003-2016: Standard diagrams for macrostructure and defect in continuous casting slab---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/YBT4003-2016YB FERROUS METALLURGY INDUSTRY STANDARD ICS 77.040.99 H 24 Replacing YB/T 4003-1997 Standard diagrams for macrostructure and defect in continuous casting slab Issued on. OCTOBER 22, 2016 Implemented on. APRIL 01, 2017 Issued by. Ministry of Industry and Information Technology of the People��s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Sampling and sample corrosion methods... 4 4 Defect classification and evaluation... 4 5 Inspection report... 8 Appendix A (Informative) Evaluation details for macrostructure and defect in continuous casting slab... 10 Appendix B (Normative) Standard diagrams for macrostructure and defect in continuous casting slab by etching... 12 Appendix C (Normative) Standard diagrams for macrostructure and defect in continuous casting slab by sulphur print... 41ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard is a revision of YB/T 4003-1997 Standard diagrams for macrostructure and defect in continuous casting slab. Compared with YB/T 4003-1997, the major technical changes of this Standard are as follows. -- Expand the scope of application; -- Add morphological characteristics and cause, as well as schematic diagram, of the ��white band��; -- Add the evaluation details for some defects (see Appendix A), and modify the standard diagrams accordingly (see Appendix B and Appendix C). This Standard was proposed by China Iron and Steel Industry Association. This Standard 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 Standard. Wuhan Iron and Steel Company Limited, Shougang Group Co., Ltd., Hebei Iron and Steel Co., Ltd. Tangshan Branch, China Metallurgical Information and Standardization Institute. The drafters of this Standard. Han Rongdong, Chen Shihua, Luan Yan, Wang Zhifen, Zhou Yigui, Ju Xinhua, Zhang Ping, Wu Lixin, Guo Jian, Deng Cuiqing. The previous versions �C replaced by this Standard �C of the standard are. -- YB/T 4003-1991, YB/T 4003-1997. Standard diagrams for macrostructure and defect in continuous casting slab1 ScopeThis Standard specifies the samples used in the testing of macrostructure and defect in continuous casting slab by etching and sulfur print, as well as the morphological characteristics, cause and evaluation principle of defects. This Standard applies to the evaluation for macrostructure and defect in slabs such as carbon steel and alloy steel produced by continuous casting process. The qualification grade of various defects in this Standard and the defects that are not allowed to exist shall be stipulated in the corresponding technical conditions and the agreement between the two parties.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 226, Test method for macrostructure and defect of steel by etching GB/T 4236, Steel examination by sulphur print (Baumann method)3 Sampling and sample corrosion methodsThe sample cut-out and display methods shall comply with the provisions of GB/T 226 or GB/T 4236.4 Defect classification and evaluation4.1 Morphological characteristics, cause and evaluation principle of various defects 4.1.1 Center segregation The morphological characteristics, cause and evaluation principle of center segregation are as follows. 4.1.2 Center porosity The morphological characteristics, cause and evaluation principle of center porosity are as follows. 4.1.3 Intermediate crack The morphological characteristics, cause and evaluation principle of intermediate crack are as follows. 4.1.4 Corner crack The morphological characteristics, cause and evaluation principle of corner crack are as follows. 4.1.5 Triangular crack The morphological characteristics, cause and evaluation principle of triangular crack are as follows. 4.1.6 Alumina (Al2O3) inclusions The morphological characteristics, cause and evaluation principle of alumina (Al2O3) inclusions are as follows. 4.1.7 Pinhole bubbles The morphological characteristics, cause and evaluation principle of pinhole bubbles are as follows. 4.1.8 Honeycomb bubbles The morphological characteristics, cause and evaluation principle of honeycomb bubbles are as follows. 4.1.9 Silicate inclusions The morphological characteristics, cause and evaluation principle of silicate inclusions are as follows. 4.1.10 White bands The morphological characteristics, cause and evaluation principle of white bands are as follows. 4.2 Standard diagrams 4.2.1 This Standard includes the following two sets of standard diagrams. a) Macrostructure diagram of continuous casting slab by etching (see Appendix B); b) Sulfur print standard diagrams (see Appendix C). 4.2.2 All types of standard diagrams for defect are composed of 6 grades from 0.5 to 3.0, which increase with the severity of the defect. See Appendix A for the size or quantity of specific defects. 4.3 Evaluation method and qualification grade 4.3.1 All types of defects are limited to visual visibility, at a start-rating grade of 0.5. When evaluating, grade by comparing with the diagrams listed in Appendix B and Appendix C. Where the defect grade cannot be determined by comparison, refer to Appendix A for measurement and evaluation. 4.3.2 The selection of the standard diagram, the qualification grade of various defects and the defects that are not allowed to exist shall be in accordance with the provisions of product standards or technical conditions.5 Inspection reportThe inspection report shall include the following contents. a) entrusting unit; b) test steel designation; c) melting number of the test sample; d) sample number; e) specifications of the continuous casting slab;Appendix A(Informative) Evaluation details for macrostructure and defect in continuous casting slab A.1 Center segregation A.1.1 The segregation of class A is distributed continuously; the segregation of class B is distributed discontinuously (strip segregation with a length of more than 3 mm); the segregation of class C is distributed in point form. The schematic diagram is shown in Figure A.1. A.1.2 When there are two classes of center segregation in the field of view, the evaluation shall be made based on the principle that the length of the segregated band with the higher class (class A > class B > class C) exceeds a quarter of the length of the entire sample. When class A does not exceed 1/4 of the total length of the sample, but Classes A+B exceed 1/4 of the total length of the sample, evaluate it as class B. See Table A.1 for the relationship between class and segregation thickness. The thickness is the average value of 5 points at the most serious part of segregation defects. A.2 Standard for internal cracks Class A Class B Class C Grade Class A segregation thickness t Class B segregation thickness t Class C segregation thickness t Intermediate cracks, triangular cracks and corner cracks are rated based on the largest single crack length (see Table A.2). The crack length is the length of a straight line or a curve. A.3 Bubbles and Al2O3 inclusions The evaluation of pinhole bubbles, honeycomb bubbles and Al2O3 inclusions is mainly based on the size and distribution of the bubbles. The pinhole bubbles and inclusions are rated by the maximum diameter; the honeycomb bubbles are rated by the maximum bubble width (Table A.3).Appendix B(Normative) Standard diagrams for macrostructure and defect in continuous casting slab by etchingAppendix C(Normative) Standard diagrams for macrostructure and defect in continuous casting slab by sulphur print ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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