SAE AMS 7904B pdf download

SAE AMS 7904B pdf download.Beryllium Bars,Rods,Tubing, and Shapes High Ductility Grade.
1.1 Form:
This specification covers beryllium in the torn, of bars, rods, tubing, and machined shapes fabricated from vacuum hot pressed powder.
1.2 Application:
These products have been used typically for parts requiring a combination of high strength-to-weight ratio, high modulus of elasticity, and high ductility, but usage is not limited to such applications.
1,3 Safety- Hazardous Materials:
While the materials, methods, applications and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.
1.3.1 WARNING: Beryllium Product: Inhalation of dust or fumes may cause serious chronic lung disease. Potential cancer hazard is based principally on animal tests.
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.
Radiographic Inspection: Radiographic inspection, to a penetrameter sensitivity of 2%, shall be performed in accordance with ASTM E 1742; however, exceptions are taken to the penetrameter contrast requirement and applicable area of penetrameter density ranges of +30% or -15% from the density at penetrameter location(s).
3.4.1.3.1 Radiographic indications (voids or inclusions) shall conform to the following requirements:
3.4.1.3.1.1 Maximum Dimension of any Indication: Any dimension of any Indication, measured in the plane of the radiograph, shall not exceed 0.030 inch (0.76 mm).
3.4.1.3.1.2 Maximum Average Dimension of any Indication: The average dimension of an indication shall be the arithmetic average of the maximum and minimum dimensions, measured in the plane of the radiograph, and shall not exceed 0.020 inch (0.51 mm).
3.4.1.3.1.3 Total Combined Volume Per Cubic Inch (16.4 cm3) of All Indications: The total combined volume per cubic inch (16.4 cm3) of all detectable radiographic indications shall not exceed the volume of a 0.050 inch (1.27 mm) diameter sphere (e.g.. total spherical volume shall not exceed 0.000065 in3 [1.07 mm3J). For calculation purposes, assume all indications are spherical.
3.4.1.3.1.4 Part Density Uniformity: The terms variable density areas, banding or striations denote relatively large areas of a radiograph, which vary in density as compared to the surrounding area. These areas shall not vary in radiographic density by more than 5% compared to the surrounding area of comparable section thickness. Suspect areas shall be re-radiographed and interpreted with the appropriate penetrameter or beryllium of 5% in thickness placed as follows:
a. Less dense (darker radiograph) areas shall be covered by the penetrameter. The radiograph of the covered area shall appear lighter than that of the adjacent area.
b. More dense (lighter radiograph) areas shall have the penetrameter placed immediately adjacent to them. The radiograph of the covered areas shall appear lighter than that of the suspect more-dense area.
3.4.1.3.1.5 Discrete high density (light radiograph) indications, or areas in product 1.000 inch (25.40 mm) and under in nominal thickness, which are 5% or less in radiographic density variation compared to the surrounding material, are acCeptable.
3.4.2 Surface Condition:
3.4.2.1 Visual: No restrictions to size or number of visual imperfections if they do not hold fluorescent penetrant dye.
13.4.2.2 Surface Indications: Penetrant inspection shall be performed in accordance with ASTM E 1417, Type 1. Level2.
3.4.2.2.1 Individual Indications: Shall not exceed 0.050 inch (1.27 mm) in major dimension.
3.4.2.2.2 Frequency: Any one square inch (6.45 cm2) shall contain no more than three indications
measuring 0.003 to 0.050 inch (0.08 to 1.27 mm) in major dimension.
3.5 Tolerances:
Product shall conform to the dimensions and dimensional tolerances specified in the purchase order and applicable drawings. If tolerances are not specified, the following standard tolerances shown in Table 3 in accordance with ANSI Y14.5M, shall apply.