SAE AMS 27593G:2018 pdf free

SAE AMS 27593G:2018 pdf free.Heat Treatment Precipitation-Hardening Corrosion-Resistant, Maraging, and Secondary Hardening Steel Parts
In addition to those listed in AMS2759, the issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence.
Shall be controlled so as not to contaminate the parts being heat treated. Furnaces used to heat treat other classes of steel using atmospheres that could contaminate precipitation-hardening, maraging, or secondary hardening steel parts, such as endothermic, exothermic, carbon-containing nitrogen-base, etc., shall have purge cycles (see 8.2) run and then shall be tested to ensure that the surfaces of parts are not contaminated beyond the limits specified in 3.4.3. Parts being heat treated shall be suitably isolated from products of combustion. Materials that could attack or contaminate metal shall not contact parts during heat treatment. Composition and maintenance of salt baths shall be such as to prevent contamination of the parts. Salt baths shall be in accordance with AMS2759.
If the aging cycle is interrupted due to power loss or furnace malfunction that causes the furnace temperature to drop below the required setpoint tolerance, the aging cycle can be continued to complete the required soak time. For example, if power is lost 1 hour and 20 minutes into a 4 hour age cycle, the parts can be re-heated to the aging temperature and aged for 2 hours and 40 minutes in order to complete the 4 hour age. In no cases can the cumulative aging time exceed the maximum time tolerance (for example, 4 hour ages allow +30 minutes, the cumulative aging time cannot exceed 4 hours and 30 minutes). Only one such interruption is allowed per aging cycle. Further interruptions or exceeding the aging time tolerance require reworking via re-solution treatment.SAE AMS 27593G pdf free download.