SAE AMS 2440A pdf download

SAE AMS 2440A pdf download.lnspection of Ground, Chromium Plated Steel Parts.
1,1 Purpose:
This specification covers the requirements, procedures, and acceptireject criteria for inspecting ground chromium plated surfaces for grinder-induced damage to the chromium plate and substructure.
1.2 Application:
This procedure has been typically used for nondestructive testing of heat treated, high strength, 180 ksi (1240 MPa) or higher tensile strength, low-alloy steel parts which have been chromium plated and subsequently ground, but usage is not limited to such applications.
12.1 It is possible to have areas of overheated chromium plate without damage to the substrate. Overheating sufficient to damage the substrate will be exhibited by indications in the ground chromium plated surface.
2. APPLICABLE DOCUMENTS:
The issue of the following documents in effect on the date of the purchase order form 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 canceled and no superseding document has been specified, the last published issue of that document shall apply.
2.1 SAE Publications:
Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
AMS 2644 Inspection Material. Penetrant
AMS 2649 Etch Inspection of High Strength Steel Parts
AMS 3041 MagnetIc Particles, Wet Method. Oil Vehicle
AMS 3042 Magnetic Particles, Nonfluorescent Wet Method. Dry Powder
3.3.2 All ground chromium plated parts shall be cleaned and dried to remove lubricants, grease, oil, coolants, soaps, alkalies, and other substances which would interfere with inspection. Rinsing with or immersion in a corrosion inhibited hot alkaline cleaner or hand wiping or immersion in a suitable solvent, or both, are suitable for this purpose.
3.4 Ground Parts:
Parts shall be fluorescent penetrant inspected in accordance with ASTM E 1417 after all plating and grinding operations. Parts made from magnetizable steels shall be magnetic particle inspected in accordance with ASTM E 1444. Parts shall be free of defects indicative of abusive grinding, plating induced damage, or both.
3.5 Fluorescent Penetrant Inspection:
Shall be accomplished only by inspectors qualified in penetrant inspection and certified to SNT-TC-1A, Level II. Questionable indications shall be resolved by a level Ill penetrant inspector.
I3.5.1 Each part shall be fluorescent penetrant inspected in accordance with ASTM E 1417 as follows, using materials specified in 3.1.2 and equipment specified in 3.2.
3.5.1.1 Examine part under black light without developer for evidence of mud•cracks and grinder- induced damage utilizing the criteria of 3.5.2 and Figures 1 through 8.
3.5.1.2 Apply nonaqueous developer and repeat inspection under black light as in 3.5.11.
3.5.2 Acceptance Criteria:
3.5.2.1 Mud-Cracking:
3.5.2.1.1 Mud-cracking in chromium plate is not invariably indicative of abusive grinding (See Figure 1) and, consequently, is not always a rejectable penetrant indication. Mud-cracking due to grinding is always rejectable except when permitted by the drawing.
3.5.2.1.2 When crack indications are in chromium runout areas, or areas designated on the drawing where imperfect chromium is acceptable, the part may be accepted provided magnetic particle inspection verifies that no cracks exist in the substrate.
3.5.2.1.3 If there is a directional quality to the mud -crack pattern, where it occurs in bands or spirals, it is a clear indication of abusive grinding and is unacceptable. Typical patterns and directions of abusive grinding are shown on Figures 2 and 6, but size of indications shall not be considered when determining acceptability of the Indication.
3.5.2.2 Crazed Surface: A more closely knit network of smooth microcracks normally present in chromium plating is acceptable. Generally this pattern cannot be resolved with the unaided eye and appears as a crazed surface on the chromium plating. Figures 3 and 4 illustrate the difference between mud-cracks and microcracks.