SAE AMS 6519B pdf download

SAE AMS 6519B pdf download.Steel,Maraging, Bars, Forgings,Tubing, and Rings 19Ni – 3.0Mo -1.4Ti -0.10Al Double Vacuum Melted , Annealed.
1.1 Form:
This specification covers a premium aircraft-quality. maraging steel in the form of bars, forgings, mechanical tubing, flash welded rings, and stock for forging or flash welded rings.
1.2 Application:
These products have been used typically for parts, such as pressure vessels, requiring through hardening, without quenching, to a minimum yield strength of 240 ksi (1655 MPa) and where such parts may require welding during fabrication, 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 2248 Chemical Check Analysis Limits, Corrosion and Heat Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Alloys
AMS 2251 Tolerances, Low-Alloy Steel Bars
MAM 2251 Tolerances, Metric, Low-Alloy Steel Bars
AMS 2253 Tolerances, Carbon and Alloy Steel Tubing
3.5.2.1 Type E is titanium nitrides and shall be rated in the same manner as Type B.
3.5.3 Bars, Wire, Forgings, Tubing, and Flash Welded Rings:
3.5.3.1 Annealed Condition:
3.5.3.1.1 Hardness: Bars over 0.500 inch (12.70 mm) in nominal diameter or least distance between parallel sides, forgings, tubing, and flash welded rings shall have hardness not higher than 321 HB, or equivalent (See 8.2).
3.5.3.1.2 Tensile Strength: Bars 0.500 inch (12.70 mm) and under in nominal diameter or least distance between parallel sides shall have tensile strength not higher than 160 ksi (1105 MPa) or equivalent hardness (See 8.3).
3.5.31.3 Average Grain Size: Shall be as follows, determined in accordance with ASTM E 112.
3.5.3.1.3.1 Product Under 2.50 Inches (62.5 mm) In Nominal Section Thickness: ASTM No. 6 or finer (See 8.4).
3.5.3.1.3.2 Product 2.50 to 10.00 Inches (62.5 to 250.0 mm), Inclusive, in Nominal Section Thickness: ASTM No. 4 or finer (See 8.4).
3.53.2 After Maraging Heat Treatment: The product shall have the properties shown in Table 4 after being macaged by heating to 900 °F ± 10 (482 °C ± 6), holding at heat for 4 to 6 hours, and cooling to room temperature:
3.5.3.2.1 Tensile Properties: Shall be as shown in Table 4 and 3.5.3.2.1.1.
3.5.3.2.1.1 Longitudinal requirements apply to specimens taken with the axis of specimens approximately parallel to the grain flow and to specimens taken in the radial direction and in the tangential direction at the rim of disc forgings. All other specimens shall be considered to be in the transverse direction.
3.5.3.2.1.2 Transverse requirements apply only to product from which tensile specimens not less than 2.50 inches (62.5 mm) in length can be taken.
3.5.3.2.1.3 Tensile properties in the longitudinal direction need not be determined on product tested in the transverse direction,
3.5.3.2.2 Hardness: Shall be not lower than 48 HRC, cx equivalent (See 8.2), but the product shall not be rejected on the basis of hardness if the tensile property requirements are acceptable, determined on specimens taken from the same sample as that with nonconforming hardness or from another sample with similar nonconforming hardness.
3.5.3.2.3 Fracture Toughness: When specified, the product shall be subjected to fracture toughness testing. Method of test and standards for acceptance shall be as agreed upon by purchaser and vendor. ASTM E 399 Is a suggested method of test.
3.5.4 Forging Stock: When a sample of stock is forged to a test coupon and heat treated as in 3.4 and 3.5.3.2,specimens taken from the heat treated coupon shall conform to the requirements of 3.5.3.2.1 and 3.5.3.2.2 and, when specified,3.5.3.2.3. If specimens taken from the stock after heattreatment as in 3.4 and 3.5.3.2 conform to the requirements of 3.5.3.2.1 and 3.5.3.2.2, and,whenspecified,3.5.3.2.3, the tests shall be accepted as equivalent to tests of a forged coupon.
3.5.5 Stock for Flash Welded Rings: A sample of stock heat treatment as in 3.4 and 3.5.3.2 shall
conform to the requirements of 3.5.3.2.1,3.5.3.2.2, and, when specified,3.5.3.2.3.
3.6Quality:
The product, as received by purchaser,shall be uniform in quality and condition, sound, and freefrom foreign materials and from imperfections detrimental to usage of the product.
3.6.1 Steel shall be premium aircraft-quality conforming to AMS 2300 or MAM 2300.