1、AEROSPACE MATERIAL SPECIFICATIONAMS7904 REV. EIssued 1991-04Revised 2015-01Superseding AMS7904DBeryllium Bars, Rods, Tubing, and ShapesHigh Ductility GradeRATIONALEAMS7904E is a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers beryllium in the form of bars,
2、 rods, tubing, and machined shapes fabricated from vacuum hot pressed powder.1.2 ApplicationThese 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 S
3、afety - Hazardous MaterialsWhile 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 that may be involved in such use. It is the sole responsibility of the user to
4、 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 WARNINGInhaling dust or fumes containing beryllium may cause chronic beryllium disease, a serious chronic lung dise
5、ase, in some individuals. Over time, lung disease can be fatal. Read the product specific Safety Data Sheet (SDS) for additional environmental, health and safety information before working with beryllium or beryllium-containing materials. 2. APPLICABLE DOCUMENTSThe issue of the following documents i
6、n 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 cancelled and no superseding document has be
7、en specified, the last published issue of that document shall apply._SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for
8、any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyri
9、ght 2015 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER
10、 Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (outside USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS7904ESAE INTERNATIONAL
11、 AMS7904E Page 2 of 72.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy
12、Steels and Corrosion and Heat-Resistant Steels and Alloys2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM E8 / E8M Tension Testing of Metallic MaterialsASTM E112 Determining Average Gr
13、ain SizeASTM E1417 Liquid Penetrant TestingASTM E1742 Radiographic Examination2.3 ASME PublicationsAvailable from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org.ASME B46.1 Sur
14、face TextureASME Y14.5M Dimensioning and Tolerancing3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1; beryllium oxide shall be determined by gas fusion; aluminum, iron, magnesium, silicon, and other elements by spectrochemical methods; and carbon by
15、 combustion. Beryllium shall be determined by difference. In case of disputes between analyses by different spectrochemical methods, emission spectroscopy shall govern.Table 1 - CompositionElement min maxBeryllium Oxide - 0.9Aluminum - 0.05Carbon - 0.09Iron - 0.08Magnesium - 0.01Silicon - 0.04Other
16、Elements, each (3.1.1) - 0.04Beryllium 99.0 -3.1.1 Determination is not required for routine acceptance of each lot.3.2 Condition Vacuum hot pressed with secondary options of heat treatment, stress relief, and/or hot isostatic pressing (HIP) after vacuum hot pressing.SAE INTERNATIONAL AMS7904E Page
17、3 of 73.2.1 Surface FinishIf surface finish is not specified, the material shall be furnished with an as-sawed, as HIP, and/or machined surface. Machined surfaces shall have surface finish no greater than 110 Ra 125 microinches (3.2 m), determined in accordance with ASME B46.1.3.3 Properties The pro
18、duct shall conform to the following requirements.3.3.1 Tensile PropertiesShall be determined in the longitudinal and tranverse directions at room temperature as shown in Table 2 in accordance with ASTM E8 / E8M with the rate of strain maintained set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and
19、maintained within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain and may be increased thereafter to 0.05 inch/inch/minute (0.05 mm/mm/minute).Table 2 - Minimum tensile propertiesProperty ValueTensile Strength 42.0 ksi (290 MPa)Yield Strength at 0.2% O
20、ffset 30.0 ksi (207 MPa)Elongation in 4D 3.0%3.3.1.1 Transverse requirements in Table 2 apply only to product that a tensile specimen not less than 2.50 inches (63.5 mm) in length can be obtained.3.3.2 Average Grain SizeShall be no larger than 20 microns (20 m), determined in accordance with ASTM E1
21、12, using the intercept method at 500X magnification.3.4 QualityThe product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product.3.4.1 DensityShall be at least 99.0% of theoretical dens
22、ity, determined using the water displacement method. Density determination shall be accurate to the second decimal place or better.3.4.1.1 Theoretical density shall be calculated using Equation 1:Theoretical Density (gm/cm3 100%100 %Be01.8477gm cm3e-%Be03.009 gm/cm3-+=(Eq. 1)3.4.2 Radiographic Inspe
23、ctionRadiographic inspection, to a penetrameter sensitivity of 2%, shall be performed in accordance with ASTM E1742; 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).
24、 The decision to accept or reject may be made directly beneath the IQI/Shim combination.SAE INTERNATIONAL AMS7904E Page 4 of 73.4.2.1 Radiographic indications (voids or inclusions) shall conform to the following requirements:3.4.2.1.1 Maximum Dimension of any IndicationAny dimension of any indicatio
25、n, measured in the plane of the radiograph, shall not exceed 0.030 inch (0.76 mm).3.4.2.1.2 Maximum Average Dimension of any IndicationThe 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
26、exceed 0.020 inch (0.51 mm).3.4.2.1.3 Total Combined Volume Per Cubic Inch (16.4 cm3) of All IndicationsThe 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 s
27、hall not exceed 0.000065 cubic inches1.07 mm3). For calculation purposes, assume all indications are spherical.3.4.2.1.4 Part Density UniformityThe terms variable density areas, banding or striations denote relatively large areas of a radiograph, which vary in density as compared to the surrounding
28、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
29、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 li
30、ghter than that of the suspect more-dense area.3.4.2.1.4.1 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. (Not
31、e: The minimum detectable size of voids and inclusions will increase as the section thickness increases.)3.4.3 Surface Condition The product shall be free from cracks, determined as in 3.4.3.1 or 3.4.3.2.3.4.3.1 VisualNo restrictions to size or number of visual imperfections if they do not hold fluo
32、rescent penetrant dye.3.4.3.2 Surface IndicationsPenetrant inspection shall be performed in accordance with ASTM E1417, Type 1, Level 2.3.4.3.2.1 Individual IndicationsShall not exceed 0.050 inch (1.27 mm) in major dimension.3.4.3.2.1.1 FrequencyAny 1 square inch (6.45 cm2) shall contain no more tha
33、n three indications measuring 0.003 to 0.050 inch (0.08 to 1.27 mm) in major dimension.SAE INTERNATIONAL AMS7904E Page 5 of 73.5 Tolerances Product shall conform to the dimensions and dimensional tolerances specified in the purchase order and applicable drawings. If tolerances are not specified, the
34、 following standard tolerances shown in Table 3 in accordance with ASME Y14.5M, shall apply:Table 3A - Tolerances, inch/pound unitsFeature Size, InchesTolerance, InchplusTolerance, InchminusDiameter, Width, or Thickness Up to 3, incl 0.016 0.000Diameter, Width, or Thickness Over 3 to 20, incl 0.062
35、0.000Diameter, Width, or Thickness Over 20 0.250 0.000Length Up to 20, incl 0.125 0.000Length Over 20 0.250 0.000Table 3B - Tolerances, SI unitsFeature Size, MillimetersTolerance, MillimetersplusTolerance, MillimetersminusDiameter, Width, or Thickness Up to 76, incl 0.41 0.00Diameter, Width, or Thic
36、kness Over 76 to 508, incl 1.57 0.00Diameter, Width, or Thickness Over 508 6.35 0.00Length Up to 508, incl 3.18 0.00Length Over 508 6.35 0.004. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be respons
37、ible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Classification of TestsAll technical requirements are acceptance tests and shall be perfor
38、med on each lot as applicable.4.3 Sampling and Testing Shall be in accordance with the following; a lot shall consist of all product manufactured from a single hot-pressed billet, processed at the same time to the same condition as defined in 3.2.4.3.1 CompositionNot less than one sample from each l
39、ot.4.3.2 Tensile PropertiesNot less than one longitudinal and one transverse round specimen from each lot at any location.4.3.3 Grain SizeNot less than one of the broken tensile specimens from each lot.4.3.4 DensityEach hot pressed billet.SAE INTERNATIONAL AMS7904E Page 6 of 74.3.5 Radiographic and
40、Penetrant InspectionEach part, unless a sampling plan has been agreed upon by purchaser and producer.4.3.6 TolerancesEach part, unless a sampling plan has been agreed upon by purchaser and producer.4.4 Reports The producer of the product shall furnish with each shipment a report showing the results
41、of tests for composition, tensile properties, and grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS7904E, serial numbers, and quantity.4.5 Resampling and RetestingIf a valid test on
42、any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing two additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rej
43、ection of the product represented. Results of all tests shall be reported.4.5.1 Resubmittal of Rejected LotsLots rejected for failure to meet requirements specified herein may be resubmitted for tests provided the producer has reworked the lot, as necessary, to correct deficiencies or has removed th
44、e nonconforming material.5. PREPARATION FOR DELIVERY5.1 IdentificationShall be in accordance with AMS2806.5.2 PackagingThe product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and
45、transportation of the product to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modificat
46、ions authorized by purchaser, will be subject to rejection.8. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left o
47、f the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 Terms used in AMS are clarified in ARP1917.SAE INTERNATIONAL AMS7904E Page 7 of 78.3
48、Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.4 Purchase documents should specify not less than the following: AMS7904EProduct form and size of product desiredQuantity of product desiredSurface finish requirements, if applicable (See 3.2.1).PREPARED BY AMS COMMITTEE “G”
