SAE AMS 6444J pdf download

SAE AMS 6444J pdf download.Steel, Bars,Forgings, and Tubing 1.45Cr (0.98- 1.10C) (SAE52100) Premium Aircraft-Quality, Consumable Electrode Vacuum Melted.
1.1 Form:
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings.
mechanical tubing, and forging stock.
1 .2 Application:
These products have been used typically for parts requiring a through-hardening steel, usually with hardness of approximately 60 HRC in section thicknesses 0.50 inch (12.7 mm) and under, and subject to very rigid inspection standards, 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 2253 Tolerances. Carbon and Alloy Steel Tubing
MAM 2253 Tolerances. Metric, Carbon and Alloy Steel Tubing
AMS 2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels
AMS 2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection Procedure
MAM 2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection Procedure, Metric (SI) Measurement
3.1.1 Check Analysis: Composition variations shall meet the applicable requirements of AMS 2259.
3.2 Melting Practice:
Steel shall be multiple melted using consumable electrode vacuum practice in the remelt cycle.
3.3 Condition:
The product shall be supplied in the following condition: hardness and tensile strength shall be determined in accordance with ASTM A 370:
3.3.1 Bars;
3.3.1.1 Bars 0.500 inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides: Cold finished, with microstructure of spheroidized cementite in a ferrite matrix, having tensile strength not higher than 120 ksi (827 MPa) or equivalent hardness (See 8.2).
3.3.1.2 Bars Over 0.500 inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel
Sides: Hot finished and annealed, unless otherwise ordered, with microstructure of spheroidized cementite in a ferrite matrix, having hardness not higher than 207 HB, or equivalent. Bars ordered cold finished may have hardness as high as 248 HB. or equivalent (See 8.3).
3.3.2 Forgings: As ordered.
3.3.3 Mechanical Tubing: Cold finished, unless otherwise ordered, with microstructure of spheroidized cementite in a ferrite matrix, having hardness not higher than 24 HRC, or equivalent. Tubing ordered hot finished and annealed shall have hardness not higher than 95 HRB, or equivalent (See 8.3).
3.3.4 Forging Stock: As ordered by the forging manufacturer.
3.4 Properties:
The product shall conform to the following requirements: hardness testing shall be performed in accordance with ASTM A 370:
3.4.1 Macrostructure: Visual examination of transverse full cross-sections from bars, billets, tube rounds or forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections for product 36 square inches (232 cm2) and under in nominal cross-sectional area shall be no worse than the macrographs of ASTM A 604 shown in Table 2.
3.4.2.1 Thickness of D-type heavy shall not exceed 0.0005 inch (12.7 urn).
3.4.2.2 A rateable field is defined as one which has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with the Jernkontoret chart, Plate Ill, ASTM E 45.
3.4.3 Response to Heat Treatment: Specimens (See 4.3.3), protected by suitable means or treated in a neutral atmosphere to minimize scaling and prevent either carburization or clecarburization, shall have substantially uniform hardness not lower than 63 HRC at any point below any permissible decarburization after being placed in a furnace which is at 1525 °F ± 10 (829 °C ± 6). allowed to heat to 1525°F ± 10 (829°C ± 6), held at heat for 20 minutes ± 2. and quenched In commercial paraffin oil (100 SUS at 100 F (38 °C)) at room temperature.
3.4.4 Decarburization:
3.4.4.1 Bars and tubing ordered ground, turned, or polished shall be tree from decarburization on the ground. turned, or polished surtaces.