SAE AMS 27592G:2018 pdf free

SAE AMS 27592G:2018 pdf free.Heat Treatment of Low- Alloy Steel Parts Minimum Tensile Strength 220 ksi (1517 MPa) and Higher
A supplemental coating or plating is permitted when approved by the cognizant engineering organization. Fine grain copper plating in accordance with AMS2418 or nickel plating in accordance with AMS2424 may be used without approval but the surface contamination specimens in AMS2759 shall not be plated. Failure of the unplated specimen to meet contamination requirements shall result in investigation and remedial action taken against the furnace. Additional surface contamination specimens,which include supplemental coating or plating may be processed and tested, and shall be used to represent the parts within the load.
Parts coated with copper or nickel plate or similar reflective coatings that tend to reflect radiant heat shall have their soak time increased by at least 50%，for annealing, normalizing, sub-critical annealing, or austenitizing unless load thermocouples are used. This increase does not apply to salt bath heat treating, tempering, or sub-zero processing.
When required, annealing shall be accomplished by heating to the temperature specified in Table 2, soaking for the time specified in Table 4, and cooling to below the temperature specified in Table 2 at the rate shown in Table 2 followed by air cooling to ambient temperature. Isothermal annealing treatments may be used provided equivalent hardness and microstructure are obtained.
lsothermal annealing shall be accomplished by heating to the annealing temperature specified in Table 2, soaking for the time specified in Table 4, cooling to a temperature below the critical, holding for sufficient time to complete transformation, and air cooling to ambient temperature.
When required, tempering shall be accomplished by heating to the set temperature specified in Table 3. Parts should be tempered within 2 hours from the end of quenching (see 3.4.8.1). Soaking time shall be not less than 2 hours plus 1 hour additional for each inch (25 mm) of thickness or fraction thereof greater than 1 inch (25 mm). Thickness is defined in AMS2759. When load thermocouples are used, the soaking time shall be not less than 2 hours. When multiple tempering cycles are required, parts shall be cooled to ambient temperature between tempering treatments, see Table 3. When a strength or hardness not listed in Table 3 is specified, the parts shall be processed at times and temperatures appropriate to achieve the specified properties.SAE AMS 27592G pdf free download.