Browse Standards ARP1820C
Current REVISED 2021-05-19

Chord Method of Evaluating Surface Microstructural Characteristics ARP1820C

This practice provides a method for evaluating microhardness and microstructure very close (0.002 inch (0.051 mm) or less) to the surface of a disk specimen. Specific accept/reject criteria for partial decarburization (3.7.1), inadvertent carburization/nitriding (3.7.3), total decarburization/intergranular oxidation (3.8), and other characteristics evaluated are to be found in the applicable specification where this ARP is referenced.
ARP1820C
2021-05-19
Latest
Revised
ARP1820B
2012-04-05
Historical
Reaffirmed
ARP1820A
2002-12-20
Historical
Reaffirmed
ARP1820
1984-10-01
Historical
Issued

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