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 2013 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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 USA)Fax
4、: 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/AMST6845BAEROSPACEMATERIALSPECIFICATIONAMS-T-6845 REV. BIssued 1999-01Noncurrent 2007-12Stabilized 2013-0
5、7Superseding AMS-T-6845ATubing, Steel, Corrosion-Resistant (S30400),Aerospace Vehicle Hydraulic System 1/8 Hard ConditionRATIONALEAMS-T-6845B stabilizes this document because equivalent technical requirements are contained in AMS5566.STABILIZATION NOTICEAMS-T-6845B has been declared “STABILIZED“ by
6、AMS Committee F and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newertechnology may exist. AMS Committee F has never performed a technical update of this document. Users of this docu
7、ment should refer any certification issues (e.g. exceptions listed on the certification report) to the cognizant engineering organization for their disposition. CAUTION: In many cases the purchaser is not the cognizant engineering organization (i.e. purchaser may be a sub tier supplier). AMS Committ
8、ee F recommends that the following technically equivalent (e.g. properties, fit, form, function) specification be used for future procurement. This listing does not constitute authority to substitute these specifications for the “STABILIZED” specification.AMS5566 Steel, Corrosion Resistant, Seamless
9、 or Welded Hydraulic Tubing 19Cr - 10Ni (304) High Pressure, Cold DrawnCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 2 of 10NOTICEThis document has been taken directly from U.S
10、. Military Specification MIL-T-6845D, Notice 2 and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-T-6845D, Notice 2. Any part numbers e
11、stablished by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards.
12、TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, and (b) the use of the existing government specification or standardformat.Under Department of Defense policies and procedures, any qualific
13、ation requirements and associated qualified products lists are mandatory for DOD contracts. Any requirement relating to qualified products lists (QPLs) has not been adopted by SAE and is not part of this SAE technical document.1. SCOPE:1.1 Scope:This specification presents requirements for thin-wall
14、ed (inside diameter greater than four times the wall thickness and outside diameter 1/4 inch and larger) corrosion-resistant steel tubing in approximately the 1/8 hard condition, of special quality, suitable for use in high-pressure hydraulic systems.1.2 Classification:Tubing shall be furnished in t
15、he following types and classes. Unless otherwise specified, either of the types and classes indicated may be furnished at the option of the contractor, provided that all material furnished on an individual order shall be of one type and class only.Manufacturing process typeType I - SeamlessType II -
16、 Welded and drawnUltrasonic Class, Type II onlyClass 1 - 0.125 Inch length ultrasonic calibration standardClass 2 - 0.060 inch length ultrasonic calibration standardClass 3 - Ultrasonic testing not requiredCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproductio
17、n or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 3 of 102. APPLICABLE DOCUMENTS:The following publications, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein.2.1 SAE Publications:
18、Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2243 Tolerances - Corrosion and Heat Resistant Steel Tubing2.2 U.S. Government Publications:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.QQ-P-35 Passivation Tr
19、eatments for Corrosion-Resisting SteelMIL-H-6875 Heat Treatment of SteelsFED-STD-151 Metals; Test MethodsFED-STD-183 Continuous Identification Marking of Iron and Steel ProductsMIL-STD-129 Marking for Shipment and StorageMIL-STD-163 Steel Mill Products Preparation for Shipment and StorageMIL-STD-753
20、 Corrosion-Resistant Steel Parts: Sampling, Inspection and Testing for Surface PassivationMS33584 Tubing End, Standard Dimensions for FlaredAND10104 Tubing, Steel, Corrosion-Resistant, Round Standard Dimensions For2.3 ASTM Publications:Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, P
21、A 19428-2959.ASTM E 112 Estimating the Average Grain Size of MetalsASTM A 370 Mechanical Testing of Steel Products2.4 ANSI Publications:Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ANSI B46.1 Determining Average Grain SizeCopyright SAE International Provided by IHS under license
22、 with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 4 of 103. REQUIREMENTS:3.1 Material:The material shall be manufactured by the electric-furnace process and shall conform to this specification. Heat-treating shall be in accordance with t
23、he requirements of MIL-H-6875. Heating shall be accomplished in an atmosphere which will provide a smooth gray or bright surface free from carburization, nitriding, or other deleterious surface defects.3.1.1 Chemical composition: The chemical composition shall be as specified in Table I.3.1.2 Grain
24、size: The grain size in the “as received“ condition shall average 5 or higher, as determined by method in 4.5.3.1.3 Mechanical properties: The mechanical properties shall be as specified in Table II.TABLE I. CHEMICAL COMPOSITION LIMITSElement Percent Check analysisMin. Max. Tolerance (percent)Carbon
25、 0.08 +0.01Manganese 2.00 +0.04Phosphorous 0.04 +0.005Sulfur 0.03 +0.005Chromium 18.00 20.00 0.20Nickel 8.00 10.50 0.15Molybdenum 0.75 +0.05Copper 0.75 +0.05Silicon 1.00 +0.05TABLE II. MECHANICAL PROPERTIESNominaloutsidediameter(inch)Nominal wallthickness(inch)Ultimate tensileStrength(psi)Yield stre
26、ngth0.2 percentoffset (psi)Elongationin 2 inchesminimum(percent)0.250 and over All 105,000 - 140,000 75,000 - 110,000 203.2 Flarability:One end of each piece of tubing of inside diameter 0.093 inch and larger shall be flared to the dimensions of MS33584 without cracking or forming other defects. Tub
27、ing with intermediate nominal OD shall be flared to the same percentage increase in diameter as required for the next larger nominal size. Removal of the flared portion after inspection is optional.3.2.1 Leakage: Tubing shall be subjected to a low and high pressure application without leakage as req
28、uired in 4.7.1.3.3 Bending:Tubing shall not develop cracks, tears, breaks or other flaws when subjected to the bending test specified in 4.8.3.4 Corrosion resistance:The tubing shall exhibit no evidence of cracks or intercrystalline surface attack when tested in accordance with requirements in 4.10C
29、opyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 5 of 103.5 Ultrasonic testing:Ultrasonic inspection indications for Type II Classes 1 and 2 tubing shall be not greater than those
30、from the calibration notches when the signal amplitude from the calibration notches is set at not less than 50 percent of full scale. The noise amplitude during inspection of tubes shall not be greater than 25 percent of full scale. Ultrasonic inspection shall be conducted as specified in 4.10.3.6 H
31、ydrostatic pressure resistance:Tubing shall be capable of withstanding an internal hydrostatic pressure P, without bulging, leakage, or other defects, except that any diametric permanent set of 0.002 inch per inch of diameter is acceptable. Hydrostatic test pressure shall be calculated according to
32、the following formula:where:P = test pressure in psi.S = specified minimum yield strength, psi.D = maximum permissible outside diameter (nominal OD plus tolerance), inch.d = maximum permissible inside diameter, inch, (computed as D less twice the minimum permissible wall thickness).3.7 Surface condi
33、tion:Surface shall be smooth, have a gray metallic appearance and be free from surface films, scale, flakes, or loose adherent particles of foreign matter. All chemical bath residues shall have been removed by rinsing in flowing water, followed by thorough drying. Compliance shall be determined as s
34、pecified in 4.12.3.7.1 Surface roughness: Surface roughness shall not exceed an arithmetical average roughness height rating (RHR) of 70 on inside surfaces or RHR 40 on outside surfaces, as defined by ANSI B46.1. The maximum depth of individual surface discontinuities for Type I and Class 3 shall no
35、t exceed the limits of Table III.3.7.2 Discontinuities removal: Discontinuities of equal or less depth into the outer surfaces of tubes shall be removed by light belt polishing or buffing, except that discontinuities having large root radii plainly visible to the unaided eye, whose surfaces blend sm
36、oothly into the normal tube surface, need not be removed. Passivation treatment shall follow any surface polishing or buffing operation.TABLE III. LIMITS OF DEPTH OF DISCONTINUITIESNominal wall thickness(inch)Maximum permissible depth of discontinuities(inch)0.020 and under 10 percent of nominal wal
37、l thickness.021 through .030 0.002.031 through .040 0.0025.041 through .050 0.003.051 through .066 0.004.067 through .085 0.0063.8 Passivation treatment:Treatment of inner and outer surfaces by other than pickling shall be followed by a passivation treatment in accordance with QQ-P-35. Surfaces shal
38、l be passive when tested as specified in 4.13.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 6 of 103.9 Dimensions and tolerances:3.9.1 Sizes: Tubing shall be furnished in stand
39、ard outside diameters 1/4 inch and over and wall thicknesses indicated in AND10104, or as specified by contract or purchase order. (see 6.2).3.9.2 Tolerances: The variation between measured dimensions and nominal dimensions shall not exceed the tolerances of AMS 2243.3.9.3 Weld bead: Welded (Type II
40、) tubing shall be processed to remove the bead and any dimensional indications of the presence of welds.3.9.4 Straightness: No portion of any piece of tubing shall have departure from straightness exceeding 0.060 inch in a length of 3 feet.3.9.5 Length:3.9.5.1 Exact lengths: Tubing of all sizes may
41、be ordered to exact lengths or in lengths expressed as a multiple of a definite unit, with tolerances as specified in the contract or purchase order (see 6.2).3.9.5.2 Mill lengths: When exact or multiple lengths are not specified (see 6.2), tubing will be accepted in mill lengths of 5 to 20 feet, bu
42、t not more than 10 percent of any order shall be furnished in lengths shorter than 12 feet.3.10 Identification of product:Tubing shall be marked in accordance with FED-STD-183. The markings shall include the following:AMS-T-6845Type I or Type II (seamless or welded)Class (Class 1, 2, or 3)Nominal ou
43、tside diameterNominal wall thicknessHeat number manufacturer3.11 Responsibility for specification compliance:When defects, as defined herein, are found or exposed subsequent to delivery but prior to placing the tubes in service, the contractor shall replace the defective material without expense to
44、the procuring activity,3.12 Workmanship:Tubing, as received by purchaser, shall be uniform in quality and condition and shall have a finish conforming to the best practice for high quality tubing. It shall be smooth, and free from heavy scale or oxide, burrs, seams, tears, grooves. laminations, sliv
45、ers, pits, and other injurious conditions. 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 areremovable within the tolerances specified for wall thickness but removal
46、 of such surface imperfections is not required. Tubing shall be free from grease or other foreign matter. No metallic flakes or particles shall be collected by a clean clothwhen it is drawn through the length of the bore of a test sample. Discoloration of the cloth, without the presence of flakes or
47、 grit, is acceptable.4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for inspection:Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or
48、purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-T-6845B Page 7 of
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