SAE AMS 6351F pdf download

SAE AMS 6351F pdf download.Steel, Sheet,Strip, and Plate 0.95Cr – 0.20Mo (0.28- 0.33c)(SAE 4130) Spheroidized.
1.1 Form:
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
1.2 Application:
These products have been used typically for general use where deep drawing and forming are required, but usage is not limited to such applications. Product may be through-hardened to a minimum tensile strength of 180 ksi (1241 MPa) in sections 0.125 inch (3.18 mm) and under in nominal thickness and proportionately lower strength in heavier section thicknesses.
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 Partide Inspection Procedure, Metric (SI) Measurement
AMS 2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock
AMS 2807 Identification, Carbon and Low-Alloy Steels, Corrosion and Heat Resistant Steels and Alloys Sheet, Strip, Plate, and Aircraft Tubing
3.3 Properties:
The product shall conform to the following requirements; hardness, tensile, and bend testing shall be performed in accordance with ASTM A 370:
3.3.1 Response to Heat Treatment: Product 0.249 inch (6.32 mm) and under in nominal thickness and thicker product reduced to 0.249 inch ± 0.010 (6.32mm ± 0.25) in thickness shall have tensile strength not lower than 125 ksi (862 MPa) or hardness not lower than 26 HRC, or equivalent. (See 8.2), after being hardened by quenching in oil from 1600°F ± 10(871 °C ± 6). and tempered for not less than 30 minutes at not lower than 900 °F (482 °C).
3.3.2 Average Grain Size: Shall be ASTM No. 5 or finer determined in accordance with ASTM E 112 (See 8.3).
3.3.3 Decarburization: Depending upon thickness of the product, decarburization may be measured by a HR3ON hardness step test method, or by the microhardness traverse method. Additionally, the metallographic method shall be used, in part (See 3.3.3.4.1), to inspect product 0.025 to 0.250 inch (0.64 to 6.35 mm) thick, and it may be used to inspect product with thickness 0.375 inch (9.52 mm) and over.
3.3.3.1 In the case of dispute, the microhardness method, conducted in accordance with ASTM E 384, shall govern. The allowance for decarbunzation shall be that which would have been applicable had the step method been used (See 3.3.3.4.1 or 3.3.3.5.1, as applicable.).
3.3.3.2 Specimens: Shall be full thickness of the product except that specimens from plate
0.250 inch (6.35 mm) and over in nominal thickness may be slices approximately 0.250 inch
(6.35 mm) thick cut parallel to and preserving one original surface of the plate. Recommended
minimum specimen size is 1 x 4 inches (25 x 102 mm). For product 0.025 to 0.250 inch (0.64 to
6.35 mm), a full cross section metallographic sample shall be prepared to inspect for presence of
complete decarburization (ferrite).
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.
3334.1 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.