GB/T 7216-2009: Metallographic test for gray cast iron

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Scope

This Standard specifies the evaluation method of gray cast iron microstructure
under optical microscope.
This Standard makes provisions in pearlite number, carbide number,
phosphorus eutectic number, and eutectic number. It also lists corresponding
evaluation figures.
This Standard is applicable to the microstructure that is used to evaluate
ordinary and low-alloy gray cast irons.

Basic Data

Standard ID	GB/T 7216-2009 (GB/T7216-2009)
Description (Translated English)	Metallographic test for gray cast iron
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J31
Classification of International Standard	77.140.80
Word Count Estimation	20,271
Date of Issue	2009-10-30
Date of Implementation	2010-04-01
Older Standard (superseded by this standard)	GB/T 7216-1987
Quoted Standard	GB/T 9439; GB/T 13298
Adopted Standard	ISO 945-1-2008, MOD
Regulation (derived from)	National Standard Approval Announcement 2009 No.12 (Total No.152)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the method of assessment under an optical microscope gray cast microstructure. This standard graphite distribution shape, graphite length, pearlite number, carbide quantity, phosphorus eutectic number, eutectic number of evaluation method provides made ??and lists the corresponding rating chart. This standard applies to general assessment of gray cast iron and low- alloy microstructure.