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CHORD METHOD OF EVALUATING SURFACE MICROSTRUCTURAL CHARACTERISTICS

1984-10-01
HISTORICAL
ARP1820
This practice provides a method of evaluating microhardness and microstructure very close to the surface. It is useful for process control in heat treatment of steel parts to detect nitriding and carburization as well as decarburization and excessive intergranular oxidation. It also may be valuable for other evaluations, e.g., plated coatings and other materials.
Standard

Chord Method of Evaluating Surface Microstructural Characteristics

2012-04-05
HISTORICAL
ARP1820B
This practice provides a method of evaluating microhardness and microstructure very close to the surface of a disk specimen. It is useful for process control in heat treatment of steel parts to detect nitriding and carburization as well as decarburization and excessive intergranular oxidation. It also may be valuable for other evaluations, e.g., plated coatings and other materials.
Standard

Chord Method of Evaluating Surface Microstructural Characteristics

2002-12-20
HISTORICAL
ARP1820A
This practice provides a method of evaluating microhardness and microstructure very close to the surface of a disk specimen. It is useful for process control in heat treatment of steel parts to detect nitriding and carburization as well as decarburization and excessive intergranular oxidation. It also may be valuable for other evaluations, e.g., plated coatings and other materials.
Standard

Chord Method of Evaluating Surface Microstructural Characteristics

2021-05-19
CURRENT
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.
Standard

Continuous Identification Marking of Iron and Steel Products

1998-12-01
HISTORICAL
AMSSTD183
This standard establishes uniform physical item identification marking in constantly recurring symbols for selected iron and steel products which are procured and issued for Government agencies. Shipment and inspection acceptance marking are not within the scope of this standard.
Standard

HEAT TREATMENT Carbon, Low-Alloy, and Specialty Steels

1976-01-01
HISTORICAL
AMS2760
This specification covers the procedure for through-hardening and related heat treatments of carbon, low-alloy, and specialty steel parts to produce specified mechanical properties within the capability of each respective steel.
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