Ameralloy Air is an air-hardening tool
steel possessing excellent non-deforming
properties. Its wear resistance is midway
between the high carbon/high chromium
Ameralloy D, and the manganese oil
hardening steel, Ameralloy Oil.
While Ameralloy Air may be hardened by quenching in either air or oil, air-quenching is recommended to virtually eliminate the risk of breakage. Ameralloy Air is particularly adapted to applications that demand toughness and high abrasion resistance
Heating – Ac range 1475° to 1540°F
Cooling – Ar range 1310° to 670°F
Effectiveness of heat treatment on sections of increasing mass. Sample lengths of at least double the cross section were hardened as shown below. Rockwell C hardness obtained for 1” disc cut from the midsection of sample length:
Ameralloy-tested fracture grain size and Rockwell C hardness of specimens 1” square x 4” long, quenched in air and oil after holding one hour at 1600°–1900°F:
|Still Air Quenching Temperature (°F)||Fracture Grain Size||Rockwell C|
|Oil Quenching Temperature (°F)||Fracture Grain Size||Rockwell C|
Rockwell C hardness of specimens 1” square when air-quenched from 1775°F or oil-quenched from 1750°F. Tempered at various temperatures:
|Tempering Temperature (°F)||1775°F Air-Quench||1750°F Oil-Quench|
Above results on 1” diameter specimens may be used as a guide in tempering tools to desired hardness. Tools of heavy section or mass may be several points lower in Rockwell hardness for a given treatment.