GB/T 38720-2020: Microstructure examination of medium-carbon steel and medium-carbon alloy structural steel after quenching

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Scope

This Standard specifies raw materials and requirements, inspection
requirements, quenching microstructure grade and evaluation for common
medium-carbon structural steel and medium-carbon alloy structural steel.
This Standard is applicable to inspection and evaluation of microstructure after
parts quenching and tempering of medium-carbon structural steel and medium-
carbon alloy structural steel.
This Standard is not applicable to evaluation of microstructure that contains
decarburization, over-burning as well as microstructure under isothermal
quenching after parts quenching and tempering of medium-carbon structural
steel and medium-carbon alloy structural steel.

Basic Data

Standard ID	GB/T 38720-2020 (GB/T38720-2020)
Description (Translated English)	Microstructure examination of medium-carbon steel and medium-carbon alloy structural steel after quenching
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J36
Classification of International Standard	25.200
Word Count Estimation	26,288
Date of Issue	2020-03-31
Date of Implementation	2020-10-01
Quoted Standard	GB/T 699; GB/T 1979; GB/T 3077; GB/T 6394; GB/T 7232; GB/T 10561; GB/T 30067; GB/T 34474.1; GB/T 34895
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration
Summary	This standard specifies the commonly used medium carbon carbon structural steel and medium carbon alloy structural steel raw materials and requirements, inspection requirements, quenching microstructure grade and evaluation and so on. This standard applies to the inspection and evaluation of the microstructure after quenching and tempering of medium carbon carbon structural steel and medium carbon alloy structural steel parts. This standard does not apply to the evaluation of microstructures containing decarburization and overburning after quenching and tempering of medium carbon carbon structural steel and medium carbon low alloy structural steel parts and the microstructure under austempered state.