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 theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication ma
3、y 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 (outside US
4、A) 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/AMS5568GAEROSPACEMATERIALSPECIFICATIONAMS5568 REV. G Issued 1954-05 Reaffirmed 2006-04 Revised
5、2011-07 Superseding AMS5568F Steel, Corrosion and Heat Resistant, Welded Tubing 17Cr - 7.1Ni - 1.1Al Solution Heat Treated, Precipitation-Hardenable (Composition similar to UNS S17700) RATIONALEAMS5568G results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specific
6、ation covers a corrosion and heat resistant steel in the form of welded tubing. 1.2 ApplicationThis tubing has been used typically for parts requiring corrosion resistance and high strength up to 600 F (316 C) after precipitation heat treatment, but usage is not limited to such applications. 1.2.1 C
7、ertain design and processing procedures may cause this tubing to become susceptible to stress-corrosion cracking after precipitation heat treatment; ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the pur
8、chase 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 been specified, the last publishe
9、d issue of that document shall apply. 2.1 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.AMS2243 Tolerances, Corrosion and Heat-Resistant Steel Tubing AMS2248 C
10、hemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Alloys Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS5568G P
11、age 2 of 6 AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought Products and Forging Stock AMS2632 Inspection, Ultrasonic, of Thin Materials, 0.50 Inch (12.7 mm) and Under in Cross-Sectional Thickness AMS2807 Identification, Carbon and Low-Alloy Ste
12、els, Corrosion and-Heat Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700
13、 West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A 370 Mechanical Testing of Steel Products ASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron AlloysASTM E 426 Electromagnetic (Eddy Current) Examination of Seamless and
14、Welded Tubular Products, Austenitic Stainless Steel and Similar Alloys ASTM E 1417 Liquid Penetrant Testing 3. TECHNICAL REQUIREMENTS 3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 353, by spectrochemical metho
15、ds, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max CarbonManganeseSiliconPhosphorusSulfurChromiumNickelAluminum-16.00 6.50 0.75 0.09 1.00 1.00 0.040 0.030 18.007.75 1.50 3.1.1 Check Analysis Composition variations shall meet the applicable requirements
16、of AMS2248. 3.2 Condition Solution heat treated and, unless solution heat treatment is performed in an atmosphere yielding a bright finish, pickled as required or passivated. Tubing shall have been cold worked sufficiently to ensure proper weld reinforcement height and roundness in the weld reinforc
17、ement area. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS5568G Page 3 of 6 3.3 Fabrication Tubing shall be produced by a welded and drawn process. Any finishing operation applied to remove
18、objectionable pits and surface blemishes shall be performed prior to final solution heat treatment. A light polish to improve external surface appearance may be employed after solution heat treatment and, if performed, the product shall be subsequently passivated.3.4 Solution Heat Treatment Tubing s
19、hall be solution heat treated by heating to 1950 F 25 (1066 C 14), holding at heat for a time commensurate with wall thickness and heating equipment and procedure used, and cooling in air or quenching in water. 3.5 PropertiesTubing shall conform to the following requirements; hardness and tensile te
20、sting shall be performed in accordance with ASTM A 370: 3.5.1 As Solution Heat Treated 3.5.1.1 Tensile Properties Shall be as shown in Table 2. TABLE 2 - TENSILE PROPERTIES Property Value Tensile Strength, max Yield Strength at 0.2% Offset, max Elongation in 2 Inches (50.8 mm), min 150 ksi (1034 MPa
21、) 55 ksi ( 379 MPa) 20% 3.5.1.2 HardnessShall be not higher than 92 HRB, or equivalent (See 8.2). 3.5.1.3 FlarabilitySpecimens as in 4.3.1 shall withstand, without formation of cracks or other visible defects, flaring at room temperature by being forced axially with steady pressure over a hardened a
22、nd polished tapered steel pin having a 74-degree included angle to produce a flare having a permanent expanded OD as agreed upon by purchaser and vendor (See 8.5). 3.5.2 After Austenite Conditioning and Precipitation Heat Treating Tubing shall have the properties shown in 3.5.2.1 and 3.5.2.2 after b
23、eing austenite conditioned by heating to 1400 F 25(760 C 14), holding at heat for 90 minutes 5, cooling to 55 F 5 (13 C 3) within 1 hour, holding at that temperature for not less than 30 minutes, and precipitation heat treated by heating to 1050 F 10 (566 C 6), holding at heat for 90 minutes 5, and
24、cooling to room temperature. 3.5.2.1 Tensile Properties Shall be as shown in Table 3. TABLE 3 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 2 Inches (50.8 mm) 180 ksi (1241 MPa) 150 ksi (1034 MPa) 6% Copyright SAE International Provided by I
25、HS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS5568G Page 4 of 6 3.5.2.2 Hardness Shall be not lower than 38 HRC, or equivalent (See 8.2). 3.6 Quality Tubing, as received by purchaser, shall be uniform in quality and condition and s
26、hall have a finish conforming to the best practice for high quality aircraft tubing. It shall be smooth and free from grease, oil and other foreign matter, heavy scale or oxide, burrs, seams, tears, cracks, grooves, laminations, slivers, pits, and other imperfections detrimental to usage of the tubi
27、ng. Surface imperfections, such as handling marks, straightening marks, light mandrel and die marks, shallow pits, and scale pattern, will not be considered injurious if the imperfections are removable within the tolerances specified for wall thickness, but removal of such imperfections is not requi
28、red. 3.6.1 If weld reinforcement is present at the welds on the inner surface of the tubing, such weld reinforcement shall be not thicker than 0.010 inch (0.25 mm). The outer surface of the tubing shall be free from weld reinforcement. 3.6.2 When specified by purchaser, tubing shall be subjected to
29、fluorescent penetrant inspection in accordance with ASTM E 1417, to ultrasonic inspection in accordance with AMS2632, to electromagnetic (eddy-current) testing in accordance with ASTM E 426, or to any combination thereof. Standards for such inspections shall be as agreed upon between purchaser and v
30、endor (See 8.5). 3.7 TolerancesShall conform to all applicable requirements of AMS2243. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of tubing shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser rese
31、rves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the tubing conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.5.1.1 and 3.5.2.1), quality (3.6), and tolerances (3.7) are acce
32、ptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Hardness (3.5.1.2 and 3.5.2.2) and flarability (3.5.1.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and
33、 Testing Shall be in accordance with AMS2371 and the following: 4.3.1 Specimens for flarability test (3.5.1.3) shall be full tubes or sections cut from a tube. The end of the specimen to be flared shall be cut square, with the cut end smooth and free from burrs, but not rounded. Copyright SAE Intern
34、ational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS5568G Page 5 of 6 4.4 Reports The vendor of tubing shall furnish with each shipment a report showing the results of tests for composition of each heat and for tensi
35、le properties of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS5568G, size, and quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS2371. 5. PREPARATION FOR DELIVERY
36、 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight tubing will be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than 10% of any shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 IdentificationShall be in accordance wi
37、th AMS2807. 5.3 PackagingTubing shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the tubing to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A ve
38、ndor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Tubing not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (l) located i
39、n 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 of the document title indicates a complete revision of the document, including technical revisions
40、 Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Hardness conversion tables for metals are presented in ASTM E 140. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenhe
41、it 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. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or net
42、working permitted without license from IHS-,-,-SAE AMS5568G Page 6 of 6 8.5 Purchase documents should specify not less than the following: AMS5568GSize of tubing desired Quantity of tubing desired Permanent expanded OD for flarability test (See 3.5.1.3) Methods for nondestructive testing and standards for acceptance, if required (See 3.6.2). PREPARED BY AMS COMMITTEE “F“ Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
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