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Metallographic hanging diagram of gray cast iron
NegotiableUpdate on 05/06
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Gray cast iron metallographic chart GB/T7216-2023 $r $n1 graphite distribution schematic diagram $r $n2 graphite length grade reference figure 1-8 $r $n3 pearlite content reference figure $r $n4 carbide content reference figure $r $n5 phosphorus eutectic content reference figure $r $n6 phosphorus eutectic type reference figure 1-8
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gold phase Hanging chart 200Color printing on copperplate paper Clear images and exquisite printing Unified specifications:51 X 36centimeter |
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15grayMetallographic Hanging Chart of Cast Iron（GB/T7216-2023） 1 Schematic diagram of graphite distribution morphology 2 Reference diagram for graphite length grade（1-8Grade) 3 Reference diagram for pearlite content 4 Reference diagram for carbide content 5 Reference diagram for phosphorus eutectic content 6 Reference diagram for phosphorus eutectic type（1-8Grade) |
13Zhang |
| Metallographic examination of gray cast iron scope This document specifies the preparation of specimens, inspection items, rating charts, result representation, and test reports for metallographic examination of gray cast iron. It is applicable for evaluating the microstructure of gray cast iron. Normative reference document 2 The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for referenced documents with dates, only the version corresponding to that date is applicable to this document; The latest version (including all modification orders) of the referenced document without a date is applicable This document. GB/T 5611 Foundry Terminology GB/T 13298 Method for microstructure examination of metals 3 Terms and definitions The terms and definitions defined in GB/T 5611 and the following are applicable to this document. 3.1 Graphite length The maximum straight-line distance between any two points on the contour of a graphite sheet. Sample Preparation 4.1 Metallographic specimens should be taken from the test block or casting, and the testing surface should avoid the casting surface. 4.2 Metallographic specimens shall be prepared in accordance with the provisions of GB/T 13298. During the process of cutting and preparing metallographic specimens, measures shall be taken to prevent changes in the microstructure, graphite peeling, and graphite dragging. The surface of the specimen shall be smooth and free from coarse scratches. 5 Inspection Items and Rating Chart 5.1 Distribution morphology of graphite 5.1.1 To inspect the distribution morphology of graphite in polished state, first observe the entire inspected surface and evaluate it according to the corresponding rating chart based on the graphite morphology in most fields of view, with a magnification of 100 times. According to the distribution pattern of graphite, it can be divided into six types, as shown in Figure 1, and detailed explanations can be found in Table 1. Appendix C provides typical examples of the distribution morphology of flake graphite.
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