GB/T 13320-2007: Metallographic grading atlas and assessing method for steel die forgings

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Scope

This 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.

Basic Data

Standard ID	GB/T 13320-2007 (GB/T13320-2007)
Description (Translated English)	Metallographic grading atlas and assessing method for steel die forgings
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J32
Classification of International Standard	77.140.85
Word Count Estimation	21,277
Date of Issue	2007-04-18
Date of Implementation	2007-11-01
Older Standard (superseded by this standard)	GB/T 13320-1991
Regulation (derived from)	National Standard Announcement 2007 No.4 (Total No.104)
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 microstructure of steel die forgings rating chart (hereinafter referred to as the ratings chart) and assessment methods. This standard applies after quenching, normalizing, isothermal normalizing, structural steel forgings after forging controlled cooling process. This standard does not apply to forging decarbonization, assessment burnt and other organizations, overheating.