SAE AMS 6280J pdf download
SAE AMS 6280J pdf download.Steel Bars, Forgings, and Rings 0.50Cr – 0.55Ni – 0.20Mo (0.28-0.33C)(SAE 8630).
1.1 Form:
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, flash welded rings, and stock for forging or flash welded rings.
1.2 Application:
These products have been used typically for parts, with sections 0.500 inch (12.70 mm) and under in thickness at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 35 l-IRC when properly hardened and tempered and also for parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications.
2. APPLICABLE DOCUMENTS:
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.
2.1 SAE Publications:
Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.
AMS 2251 Tolerances, Low-Alloy Steel Bars
MAM 2251 Tolerances, Metric, Low Alloy Steel Bars
AMS 2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels
AMS 2301 Steel Cleanliness, Aircraft-Quality, Magnetic Particle Inspection Procedure
3.3.4.3.1 When permitted by purchaser, flash welded rings, to be machined all over by purchaser, may have decarburization greater than shown in Table 3 provided such decarburization is removable within the machining allowance for the part.
3.3.4.4 Decarburization shall be measured by the metallographic method, by the HR3ON scale hardness testing method, or by a traverse method using microhardness testing in accordance with ASTM E 384. The hardness method(s) shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by a hardness method, is defined as the perpendicular distance from the surface to the depth under that surface below which there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute. the depth of decarburization determined using the microhardness traverse method shall govern.
33.4.5 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less.
3.4 Quality:
The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product.
3.4.1 Steel shall be aircraft quality conforming to AMS 2301.
3,4.2 Bars ordered hot rofled or cold drawn and bars and flash welded rings ordered ground, turned, o polished shall, after removal of the standard machining allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the ground, turned, or polished surfaces,
3,4.3 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow.
3.5 Tolerances:
Bars shall conform to all applicable requirements of AMS 2251 or MAM 2251.
4. QUALITY ASSURANCE PROVISIONS:
4.1 Responsibility for Inspection:
The vendor of the product shall supply all samples for vendor’s tests and shall be responsible for the performance of all required teSts. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.
