SAE AMS 6412L pdf download

SAE AMS 6412L pdf download.Steel,Bars and Forgings 0.80Cr – 1.8Ni -0.25Mo(0.35 -0.40C)(4337).
1.1 Form:
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock.
1.2 Application:
These products have been used typically for parts, 0.875 inch (22.22 mm) and under in nominal section thickness at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 50 HRC and 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 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 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 Cleanliness, Aircraft Quality Steel, Magnetic Particle Inspection Procedure
MAM 2301 Cleanliness, Aircraft Quality Steel, Magnetic Particle Inspection Procedure, Metric (SI) Measurement
3.3.4.4 Decarburization shall be measured by the rnetallographic method, by HR 30N 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 influenced by any decarbunzation on the adjacent surface. In case of dispute. the depth of decarburization determined using the microhardness traverse method shall govern.
3.3.4.4.1 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.
13.4.1 Steel shall be aircraft quality conforming to AMS 2301 or MAM 2301.
3.4.2 Bars ordered hot rolled or cold drawn, or ground, turned, or 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 vendors 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.
4.2 Classification of Tests:
4.2.1 Acceptance Tests: Composihon (3.1), condition(hardness (3.2), macrostructure (3.3.1), average grain size (3.3.2). hardenability (3.3.3), decarburization (3.3.4), quality (3.4), frequency-severity cleanliness rating (3.4.1), and tolerance (3.5) are acceptance tests and shall be performed on each heat or lot as applicable.
I4.2.2 Grain flow of die forgings (3.4.3) Is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.
4.3 Sampling and Testing:
Shall be as follows:
4.3.1 Bars and Forging Stock: In accordance with AMS 2370.
4.12 Forgings: In accordance with AMS 2372.
4.4 Reports:
The vendor of the product shall furnish with each shipment a report showing the results of tests for chemical composition, macrostructure. hardenability. and frequency-severity deanliness rating of each heat and for hardness and average grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers. AMS 64121, size and quantity. If fo-gings are supplied, the size and melt source of stock used to make the forgings shall also be included.