SAE AMS 6434E pdf download

SAE AMS 6434E pdf download.Steel, Sheet, Strip, and Plate 0.78Cr – 1.8Ni – 0.35Mo – 0.20V(0.33- 0.38C).
1.1 Form:
This specification covers an aircraft-quality, low-alloy steel in the forni of sheet, strip, and plate.
1.2 Application:
These products have been used typically for parts, which may be welded during fabrication, requiring through-hardening to tensile strengths not lower than 180 ksi (1241 MPa), 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 2252 Tolerances. Low-Alloy Steel Sheet, Strip, and Plate
MAM 2252 Tolerances, Metric. Low Alloy Steel Sheet. Strip, and Plate
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
3.3.3.3 Procedure: Specimens shall be hardened by austenitizing and quenching: preferably, they shall not be tempered but, if tempered, the tempering temperature shall be not higher than 300°F (149 °C). During heat treatment, specimens shall be protected by suitable atmosphere or medium or by suitable plating to prevent carburization or further decarburization.
3.3.3.4 Product 0.025 to 0.250 Inch (0.64 to 6.35 mm), Exclusive, in Nominal Thickness: Protective plating, if used to prevent any decarburization during hardening, shall be removed, and a portion of the specimen shall be ground with copious coolant to prevent thermal or mechanical effects to a depth of 0.050 inch (1.27 mm) or one-half thickness, whichever is less.
3.3.3.4.1 Allowance: The product shall show no layer of complete decarburization (ferrite), determined metallographically at a magnification not exceeding bOX. It shall also be free from any partial decarburization to the extent that the difference in hardness between the original surface and the surface (depth) generated by grinding as in 3.3.3.4 shall not be greater than two units on the HRA scale, or equivalent (See 8.2). Also, refer to 3.3.3.1.
3.3.3.5 Product 0.250 to 0.375 Inch (6.35 to 9.52 mm), Exclusive, in Nominal Thickness: Specimens shall be ground to remove 0.0 10 inch (0.25 mm) of metal to create a test reference surface, and a portion of the specimen shall be further ground to a depth of at least one-third the original thickness of the specimen.
3.3.3.5.1 Allowance: Shall be free from decarburization to the extent that the difference in hardness between the two prepared steps shall be not greater than three units on the HRA scale, or equivalent (See 8.2). Also, refer to 3.3.3.1.
3.3.3.6 Product 0.375 Inch (9.52 mm) and Over in Nominal Thickness:
3.3.3.6.1 Allowance: The total depth of the decarburization, determined metallographically at a magnification not exceeding bOX, on the as-supplied plate, shall be not greater than shown in Table 3. Also, refer to 3.3.3.1. The depth of decarburization shall be that which is defined as the perpendicular distance from the surface to the depth under that surface below which there Is no further increase in hardness.