1、_ 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 any particular use, including any patent infringement arising there
2、from, 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.Copyright 2013 SAE International All rights reserved. No part of this pu
3、blication 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: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970
4、 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/ARP1917AAEROSPACERECOMMENDED PRACTICEARP1917 REV. AIssued 1992-01 Revised 2002-09 R
5、eaffirmed 2013-07 Superseding ARP1917 (R) Clarification of Terms Used in Aerospace Metals Specifications RATIONALEARP1917A has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:This Aerospace Recommended Practice (ARP) clarifies terms used in Aerospace materials and process sp
6、ecifications. The terms clarified in this ARP are not intended to supersede those terms for which clarification is already provided in existing specifications.2. REFERENCES:2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2300 Steel Cleanliness, Premium
7、Aircraft-Quality, Magnetic Particle Inspection ProcedureMAM 2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection Procedure, Metric (SI) MeasurementAMS 2301 Steel Cleanliness, Aircraft-Quality, Magnetic Particle Inspection ProcedureMAM 2301 Steel Cleanliness, Aircraft-Qualit
8、y, Magnetic Particle Inspection Procedure, Metric (SI) MeasurementAMS 2303 Steel Cleanliness, Aircraft-Quality, Martensitic Corrosion-Resistant Steels, Magnetic Particle Inspection ProcedureMAM 2303 Steel Cleanliness, Aircraft-Quality, Martensitic Corrosion-Resistant Steels, Magnetic Particle Inspec
9、tion Procedure, Metric (SI) MeasurementAMS 2304 Steel Cleanliness, Special Aircraft-Quality, Magnetic Particle Inspection ProcedureMAM 2304 Steel Cleanliness, Special Aircraft-Quality, Magnetic Particle Inspection Procedure, Metric (SI) Measurement2.2 ASTM Publications:Available from ASTM, 100 Barr
10、Harbor Drive, West Conshohocken, PA 19428-2959.ASTM E 45 Determining the Inclusion Content of SteelCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. TERMS:AGITATION: Intentionally induced movement o
11、f parts or material, or intentionally induced circulation of the liquid media around parts or material.AIRCRAFT-QUALITY STEEL: (see clarifications under Steel Quality)ACCEPTABLE TO PURCHASER: Does not require prior written approval from purchaser, but allows vendor to make a decision and purchaser t
12、he right to disapprove the decision.AGREED UPON BY PURCHASER AND VENDOR: Requires concurrence of both purchaser and vendor. Such concurrence is typically documented by way of the purchase order.ALUMINUM CASTING, PREMIUM GRADE: Aluminum castings that have guaranteed mechanical properties at drawing-d
13、esignated areas. Representative castings are destructively tested periodically to verify the mechanical properties.AS CAST: Castings that have had gates and risers removed, and cleaned free of mold material, but have not been subject to subsequent heat treatment.AUTHORIZED BY PURCHASER: Requires pri
14、or written approval from the purchaser.SAE INTERNATIONAL ARP1917A Page 2 of 8_Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. (Continued):BAR, ROD AND WIRE: A solid square, rectangular (other than
15、 sheet, strip, or plate), round, regular hexagon, or octagon shaped material whose length is greater than its cross section with diameter, thickness or distance between parallel surfaces falling into Table 1 below:BEST COMMERCIAL PRACTICE: A term used to describe the workmanship of metal products wh
16、ich meet the commonly recognized industry quality standard for a particular alloy, surface condition, product form, heat treat condition, and, most importantly, the method of fabrication. This term is no longer used in specifications since the standard can vary from mill to mill and product to produ
17、ct and is subject to interpretation.BILLET (REFORGING, REROLLING OR EXTRUSION STOCK): A solid metal product that is intended for subsequent hot working into finished or semi-finished products.CAPABLE OF: A term applied to certain requirements which need not be verified by the producer. If subsequent
18、 testing by the purchaser or its designee establish that the material does not meet the requirement, the material may be rejected. This term is no longer used in AMS specifications. The recommended practice is to require periodic testing at the frequency determined by the producer.TABLE 1 - Bar, Rod
19、 or WireMaterial Bar Rod WireAl or, in the case of continuous melting, was poured without interruption. (See definition of cast number and drop number used in aluminum industry).HEAT TREAT LOT: A quantity of material or parts heat treated in the same furnace at the same time. For continuously heat t
20、reated material, a heat treat lot is that quantity of material heat treated in the same furnace at the same temperature and environment without interruption. A “continuously heat treated lot“ is typically limited to an 8-hour shift.HOT FINISHING: A process by which final material dimensions and/or s
21、urface characteristics are produced by mechanically working the metal at a temperature above the recrystallization temperature. In some heat resistant alloys, process parameters may result in a small amount of residual strain hardening being retained.HOT WORKING: Changing the shape of the metal by m
22、echanical work at or above the recrystallization temperature of the metal, resulting in no intentional strain hardening.HYDRAULIC TUBING: Material used typically for transmission of fluids under pressure. The material has a wall thickness appropriate to the temperature and/or pressure of the fluid b
23、eing transported. Hydraulic tubing is typically not used for mechanical applications.INSPECTION LOT: A quantity of parts with the same attributes submitted for inspection at the same time.MATERIAL LOT: Material taken from a single heat of metal, processed at the same time into the same size and shap
24、e of product, and heat treated as a single heat treat lot.SAE INTERNATIONAL ARP1917A Page 5 of 8_Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. (Continued):MAY: This word is used to indicate an o
25、ption, and does not express a mandatory requirement.MECHANICAL TUBING: Heavy-walled typically cylindrical tubing, intended primarily for the machining of circular rings, flanges, shafts, etc., having a wall thickness which is a substantial proportion of the outer diameter. Such tubing is not normall
26、y used for the transmission of fluids, and parts made from it are usually machined all over. This product is sometimes known as “hollow bar.“NONMETALLIC INCLUSIONS: Insoluble impurities, such as oxides, aluminates, sulfides, and silicates, which are trapped mechanically, or are formed during solidif
27、ication.PIPE MATERIAL: A hollow product designated by “nominal pipe size“ and “ANSI schedule number.“ This material is generally suitable for carrying fluids and may also be suitable for mechanical applications.PLATE: Flat rolled product having the nominal thickness shown in Table 2.PREMIUM (AIRCRAF
28、T) QUALITY: (see definition under Steel Quality)PREPRODUCTION PARTS: Parts made for evaluation prior to production to ensure the production practice is capable of producing parts meeting design criteria.PROCESS LOT: A group of parts that have the same part number and are at the same location in the
29、fabrication process. These parts have either been processed as a single load, or, in the case of continuous processing, have been processed with the same process parameters in the same equipment. A “continuous processing lot“ is typically limited to 8 hours or the completion of the process if the pr
30、ocess takes longer than 8 hours.TABLE 2 - PlateMaterial Nominal ThicknessAl & Al Alloys 0.250 inch (6.35 mm) and overCu & Cu AlloysOver 0.188 inch (4.78 mm) (and greater than12 inch (3.05 mm) wide)Ni & Ni Alloys Over 0.187 inch (4.75 mm)Steel 0.187 inch (3/16 inch nominal) (4.75) and overTi & Ti All
31、oys 0.1875 inch (7.76 mm) and overSAE INTERNATIONAL ARP1917A Page 6 of 8_Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. (Continued):QUALIFICATION: Demonstration of ability to meet established cri
32、teria prior to production or delivery.ROUGH MACHINED: Metal part surfaces that have been machined but require additional machining to meet final drawing dimensions.SHALL: This word is used to express a mandatory requirement.SHEET, STRIP: A flat rolled product within the thickness and width range as
33、shown in Table 3:SHOULD: This word is used to express a recommendation that is desirable but not mandatory.SPECIMEN: A piece of material that is taken from a sample or coupon for evaluation of one or more characteristics or properties.TABLE 3 - Sheet and StripMaterialNominalThicknessWidthSheetWidthS
34、tripAl & Al Alloys 0.006 - 0.249 inch, incl(0.15 - 6.32 mm)Cu & Cu Alloys 0.005 - 0.188 inch, incl(0.13 - 4.78 mm)20 inch (508 mm)and overUnder 20 inch(508 mm)Ni & Ni Alloys 0.006 - 0.187 inch, incl(0.15 - 4.75 mm)24 inch (610 mm)and overUnder 24 inch(610 mm)Steel 0.006 - 0.1875 inch, excl(0.15 - 4.
35、76 mm)24 inch (610 mm)and overUnder 24 inch(610 mm)Ti & Ti Alloys 0.005 - 0.1875 inch, excl(0.15 - 7.76 mm)SAE INTERNATIONAL ARP1917A Page 7 of 8_Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3. (C
36、ontinued):STEEL QUALITY:Aircraft Quality - Describes alloy steels and stainless steels meeting both of the following criteria:a. Cleanliness: Meeting AMS 2301, MAM 2301, AMS 2303 or MAM 2303 requirements.b. Impurities: Having higher maximum phosphorus and sulfur in weight percentage than premium air
37、craft-quality material, but usually less than 0.025% (applies only to alloy steel).Premium Aircraft-Quality - Describes alloy steels and stainless steels meeting all the following criteria:a. Cleanliness: Meeting AMS 2300 or MAM 2300 requirements.b. Melting Practice: Multiple melted with consumable
38、electrode remelting as the final method.c. Impurities: Having lower phosphorus and sulfur weight percentage than aircraft-quality steel and usually less than 0.015% (applies to alloy steel only).Special Aircraft Quality - Describes alloy steels and stainless steels meeting all of the following crite
39、ria:a. Cleanliness: Meeting AMS 2304 or MAM 2304 requirements.b. Melting Practice: Single melted and either static or continuous cast.c. Impurities: Having lower phosphorus and sulfur weight percentage than aircraft-quality steel and usually less than 0.015% (applies only to alloy steel).SUBJECT TO
40、REJECTION: Rejected unless approved by purchaser.SUPPLIER: (see definition for Vendor) This term is no longer used in AMS specifications.TEST BLANK: (see definition for Coupon)TUBE: A hollow product that is long in relation to its cross section and has uniform wall thickness except as affected by co
41、rner radii.UNIFORM QUALITY: All specified mechanical and metallurgical properties and conditions of the material must not exhibit variations exceeding the commonly recognized industry standards.VENDOR: An organization that performs work, sells material, or provides services to a purchaser in accorda
42、nce with an agreement, contract, or specification, and agrees to be responsible for the performance of the materials or parts in accordance with the agreement, contract, or specification.VISUAL INSPECTION: Examination by eye (with visual corrective lenses if necessary), with up to 3 diopters (3X) ma
43、gnification and a minimum illumination of 80 foot-candles.WORKMANSHIP: Referring to the finished condition or quality of metal product.PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “B“SAE INTERNATIONAL ARP1917A Page 8 of 8_Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
