SAE AMS 7881B:2020 pdf free

SAE AMS 7881B:2020 pdf free.Tungsten Carbide-Cobalt Powder Agglomerated and Sintered
This document specifies the procedure and requirements for gas nitriding low-alloy and tool steels by the use of raw or dissociated ammonia. Additional alloys and steel families (e.g., stainless steels) can also be nitrided using parameters acceptable to the cognizant engineering organization.
The nitriding process described herein has been used typically for producing a wear resistant and fatigue resistant surface on steel parts, but usage is not limited to such applications. This process only applies to gas nitriding. Other processes, such as salt bath nitriding per AMS2753, ion nitriding per AMS2759/8, automated gas nitriding controlled by nitriding potential per AMS2759/10, automated gas nitrocarburizing by potential per AMS2759/12 and gas nitrocarburizing per AMS2757, are not included.
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.
Shall be fine grained copper plate, not less than 0.001 inch (25 μm) in thickness, applied in accordance with AMS2418 or bronze plate, not less than 0.0005 inch (12.7 um) in thickness, applied in accordance with AMS2429. Paints, pastes, or mechanical methods may be used if acceptable to the cognizant engineering organization. Additionally, maskants shall be checked visually for evidence of blistering after nitriding but before subsequent stripping and etching.
Masked or plated parts shall be visually inspected prior to and after nitriding. Parts exhibiting blistering, peeling, or porosity in the masking after nitriding shall be rejected (see 8.7).
Rack to prevent distortion and to ensure free circulation of the nitriding gas to all surfaces. Test specimens, or parts to be destructively evaluated, shall be placed in the working zone in approximately the same location or locations as the parts they represent.SAE AMS 7881B pdf free download.