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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2017 SAE InternationalAll rights reserved. No part of this publi
3、cation 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 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on thisTechnical Report, please visithttp:/standards.sae.org/AMS4922CAEROSPACEMATERIAL SPECIFICATIONAMS4922 REV. CIssued 1990-10Revised 2010-06Reaffirmed 2017-04Superse
5、ding AMS4922BTitanium Alloy, Seamless, Hydraulic Tubing15V -3.0Cr -3.0Al -3.0SnCold Worked and Precipitation Heat Treated(Composition similar to UNS R58153)RATIONALEAMS4922C has been reaffirmed to comply with the SAE Five-Year Review policy.1. SCOPE 1.1 Form This specification covers a titanium allo
6、y in the form of seamless tubing. 1.2 Application This tubing has been used typically for parts, such as high-pressure hydraulic lines, requiring high strength and oxidation resistance up to 550 F (288 C) and weldability, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The iss
7、ue 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 cancelled and
8、 no superseding document has been specified, the last published 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. AMS2244
9、Tolerances, Titanium and Titanium Alloy Tubing AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2634 Ultrasonic Inspection, Thin Wall Metal Tubing AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products AS33611 Tube Bend Radii 2.2 ASTM Publicatio
10、ns Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E 8 / E 8M Tension Testing of Metallic Materials ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusio
11、n Technique ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E 1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys ASTM E 2371 Analysis of Titanium and Titanium Alloys by Atom
12、ic Emission Plasma Spectrometry 2.3 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007, 2300, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentage
13、s by weight shown in Table 1; carbon shall be determined in accordance with ASTM E 1941, hydrogen in accordance with ASTM E 1447, oxygen and nitrogen in accordance with ASTM E 1409, and other elements in accordance with ASTM E 2371. Other analytical methods may be used if acceptable to the purchaser
14、. TABLE 1 - COMPOSITION Element min max Vanadium Chromium Aluminum Tin Iron Carbon Oxygen Nitrogen Hydrogen Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium 14.0 2.5 2.5 2.5 - - - - - - - remainder16.0 3.5 3.5 3.5 0.25 0.05 0.13 0.050 (500 ppm) 0.015 (150 ppm) 0.10 0.40 3.1.1 Dete
15、rmination not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. SAE INTERNATIONAL AMS4922C Page 2 of 8_ 3.2 Melting Practice Alloy shall be multiple melted. Melting cycle(s) prior to the final melting cycle shall be made u
16、sing vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice(s). The final melting cycle shall be made under vacuum using vacuum arc remelting (VAR) practice with no alloy additions permitted. 3.2.1 The atmosphere for nonconsumable
17、electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury. 3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. 3.3 Condition and Heat Treatment Cold worked and precipitation heat treated by heati
18、ng to a temperature within the range 900 to 1250 F (482 to 677 C) and holding at the selected temperature within 25 F (14 C) for not less than 2 hours. Pyrometry shall be in accordance with AMS2750. 3.4 Properties Tubing shall conform to the following requirements: 3.4.1 Tensile Properties Shall be
19、as shown in Table 2, determined in accordance with ASTM E 8 / E 8M with the rate of strain set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain. TABLE 2 - MINIMUM TENSILE PROPERTIES Pr
20、operty Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 2 Inches (50.8 mm) Nominal Wall Thickness Up to 0.020 Inch (0.51 mm), incl Over 0.020 Inch (0.51 mm) 135 ksi (931 MPa) 125 ksi (862 MPa) 10% 12% 3.4.2 Pressure Testing Tubing shall show no bulges, leaks, pin holes, cracks, or
21、other defects when subjected to an internal hydrostatic pressure (P) sufficient to cause a tensile stress equal to 125 ksi (862 MPa) in the tubing wall, except that a diametric permanent set of 0.002 inch/inch (0.002 mm/mm) of diameter is acceptable. The hydrostatic pressure (P) shall be determined
22、from Equation 1, but shall not exceed 20 ksi (138 MPa): PSDdDd=+2222(Eq. 1) where: P = Test pressure in ksi (MPa) S = 125 ksi (862 MPa) D = Nominal OD d = Nominal ID SAE INTERNATIONAL AMS4922C Page 3 of 8_ 3.4.3 Bending Tubing shall not develop cracks, tears, breaks, or other flaws when bent 180 deg
23、rees around a suitable die having a centerline radius equal to three times the nominal OD of the tubing. A solid rod or ball-type retractable mandrel inserted to the tangent of the bend, or an appropriate tube filler, shall be used to support the inside of the tube during bending to restrict flatten
24、ing to a value that does not exceed 5% of the nominal OD of the tube. Flattening shall be determined in accordance with AS33611. 3.4.4 Flattening The inside and outside surfaces of tubing shall show no cracks, tears, breaks, opened die marks, or opened polishing marks when a full section of the tube
25、 is flattened between parallel plates under a load applied gradually and perpendicularly to the longitudinal axis until the distance between the plates is not greater than values shown in Table 3. After examination of the outside surfaces, the samples shall be split longitudinally and the inside sur
26、faces examined. Examination of tube surfaces shall be at 5 to 10X magnification. TABLE 3 - FLATTENING TEST Outside Diameter toWall Thickness RatioOD/t Distance Between Plates (t = Wall Thickness) Up to 12, inclOver 12 to 16, inclOver 16 to 30, inclOver 30 to 50, inclNot Required 12t 15t 17t 3.4.4.1
27、Alternate Flattening When specified, sample(s) shall be sectioned longitudinally along the tube diameter and flattened between parallel plates until the distance between the plates is equal to the wall thickness of the tube sample. The inside and outside surfaces of tubing shall show no cracks, tear
28、s, breaks, opened die marks, or polishing marks. 3.4.5 Microstructure Shall be predominantly a cold-worked, precipitated beta structure with dispersed, fine alpha precipitate. Tubing shall be free of alpha case (8.2) or other surface contamination, determined by microscopic examination at not less t
29、han 200X magnification, ammonium bifluoride etch inspection (3.4.5.1), microhardness testing, or other method acceptable to purchaser. 3.4.5.1 Ammonium Bifluoride Etch Inspection A sample of tubing shall be etched with a solution of 18 grams ammonium bifluoride in a liter of distilled water. White o
30、r gray areas indicate alpha case. 3.4.5.2 Microstructural Hardness Differential A surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E 384 on the Knoop scale using a 200 gram load, is evidence of unacceptable surface contamination. 3.5 Qualit
31、y 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 aircraft tubing. It shall be smooth and free from scale or oxide, burrs, seams, tears, grooves, laminations, slivers, pits, and other imperfections d
32、etrimental to usage of the tubing. SAE INTERNATIONAL AMS4922C Page 4 of 8_ 3.5.1 Each tube shall be ultrasonically inspected in accordance with AMS2634, Class AA, for ID, OD, and subsurface imperfections of all types and orientation (longitudinal and transverse). 3.5.2 Surface Condition 3.5.2.1 OD S
33、urface Shall show a uniformly acid-pickled surface finish; not less than 0.001 inch (0.025 mm) of metal shall have been chemically removed from the wall thickness as a finishing operation. Belt polishing or buffing of the OD surface with a grit size of 400 or finer is permissible prior to the pickli
34、ng operation. Centerless grinding or other mechanical operations are not acceptable. 3.5.2.2 ID Surface Shall show a uniform matte finish, produced by abrasive blasting with grit not larger than 100 mesh (150 m) followed by forced-flow, acid pickle to remove not less than 0.0005 inch (0.013 mm) of m
35、etal from the wall thickness. 3.5.2.3 Surface Texture Shall be not greater than 63 microinches (1.6 m) on the ID and be not greater than 32 microinches (0.8 m) on the OD, determined in accordance with ASME B46.1. 3.5.2.4 Surface Cleanliness Tubing shall be free from grease and other foreign matter.
36、Metallic flakes or particles shall not be collected by a clean, white cloth drawn through the length of the bore of a test sample. Discoloration of the cloth, without the presence of flakes or particles, is acceptable. 3.6 Tolerances Shall conform to all applicable requirements of the following: 3.6
37、.1 Diameter Shall be as specified in Table 4; tolerances shown include ovality. TABLE 4A - OUTER DIAMETER, TOLERANCES, INCH/POUND UNITS Nominal OD Inches Tolerance Inch plus Tolerance Inch minus Over 0.093 to 0.188, incl Over 0.188 to 0.500, incl Over 0.500 to 1.000, incl Over 1.000 to 1.500, incl O
38、ver 1.500 to 2.000, incl 0.002 0.003 0.004 0.004 0.005 0.000 0.000 0.000 0.001 0.001 TABLE 4B - OUTER DIAMETER, TOLERANCES, SI UNITS Nominal OD Millimeters Tolerance Millimeter plus Tolerance Millimeter minus Over 2.36 to 4.78, incl Over 4.78 to 12.70, incl Over 12.70 to 25.40, incl Over 25.40 to 38
39、.10, incl Over 38.10 to 50.80, incl 0.05 0.08 0.10 0.10 0.13 0.00 0.00 0.00 0.025 0.025 SAE INTERNATIONAL AMS4922C Page 5 of 8_ 3.6.2 Wall Thickness All tubing 1.500 inches (38.10 mm) and under in nominal OD shall not vary more than +10%, -5%; Tubing over 1.500 inches (38.10 mm) in nominal OD shall
40、not vary more than 10%. 3.6.3 Length and Straightness Shall conform to AMS2244. 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 reserves the
41、 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 All technical requirements, except pressure testing (3.4.2), are acceptance tests and shall be performed on each
42、heat or lot as applicable. 4.2.2 Periodic Tests Pressure testing (3.4.2) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance with the following; a lot shall be all tubin
43、g of the same nominal size from the same ingot, same processing, and finishing operations and precipitation heat treated in the same furnace charge. 4.3.1 Composition One sample from each lot of tubing for hydrogen, oxygen, and nitrogen determinations shall be obtained after thermal and chemical pro
44、cessing is completed. An ingot analysis obtained from the alloy producer may be utilized to substantiate other requirements. 4.3.2 Tensile Properties One sample from each 1000 feet (305 m) or three samples from each lot, whichever is greater. 4.3.3 Bending Two samples from each lot. 4.3.4 Flattening
45、 One sample from each 135 feet (41 m) of tubing or 10 samples from each lot, whichever is less. Each sample shall be not less than 2 inches (51 mm) long, cut in half with the cuts parallel to the axis of the tube. SAE INTERNATIONAL AMS4922C Page 6 of 8_ 4.3.5 Microstructure One sample from each lot.
46、 4.3.6 Surface Condition Each tube, except that ID surface inspection need only be made on each sample selected for the flattening test. 4.3.7 Ultrasonic Inspection and Tolerances Each tube. 4.3.8 Pressure Test As agreed upon by purchaser and vendor. 4.4 Approval 4.4.1 Sample tubing and process shee
47、ts showing the parameters for process control factors for producing the tubing shall be approved by purchaser before tubing for production use is supplied, unless such approval is waived by purchaser. 4.4.2 Vendor shall establish parameters for process control factors which will produce tubing meeting the technical requirements of this specification. If necessary to make any change in parameters for the process control factors, vendor shall submit for reapproval revised process sheets and, when requested, sample tubing. Tubing inc
