Standard No.:	GB/T 13302-1991
English Name:	Steel－Determination of area content of graphite-micrographic method using diagrams
Chinese Name:	钢中石墨碳显微评定方法
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	1991-1-2
Implemented on:	1992-10-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	150.0
Delivery:	via email in 1 business day

Steel - Determination of area content of graphite-micrographic method using diagrams 1 Subject content and application scope This standard specifies the selection and preparation of determination specimen, determination methods and test reports for graphite carbon in steel by micrographic method. This standard applies to determination of the graphite carbon in steel by micrographic method. 2 Normative references GB/T 13298 Inspection methods of microstructure for metals 3 Selection and preparation of specimen 3.1 Sampling methods The specimens shall be cut from steel in delivery state. If there are special requirements, heat treatment may be carried out according to the corresponding product technical conditions or agreements. The inspection surface of the specimen is a cross-section perpendicular to the steel axis. 3.1.1 Sampling methods for round and square steel For steels with a diameter or side length of less than or equal to 20mm, the inspection surface is the entire cross section; for steels with a diameter or side length larger than 20mm, the inspection surface is the cross-section through the steel axis, with a size of 20mm×10mm.

1 Subject content and application scope 2 Normative references 3 Selection and preparation of specimen 4 Determination method 5 Test report Annex A (Supplement) Standard rating diagrams for graphite carbon in steel