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1、AEROSPACE STANDARD AS1576 REV. C Issued1980-02 Revised1996-07 Reaffirmed2007-08 Fittings, Welded, Hydraulic, Titanium and Corrosion Resistant Steel, 3000 psi Hydraulic 1.SCOPE: This document defines the requirements for weld fittings and machine weldments using an orbiting welding head suitable for
2、use on cold worked 3Al-2.5V titanium and 21Cr-6Ni-9Mn CRES tubing. 2.REFERENCES: The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other documents shall be the issue in effect on the
3、date of the purchase order. In the event of conflict between the text of this specification and references cited herein, the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
4、2.1SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS 4928Titanium Alloy Bars, Forgings and Rings, 6Al-4V, Annealed, 120,000 psi (825 MPa) Yield Strength AMS 4944Titanium Alloy Tubing, Seamless, Hydraulic 3.0Al-2.5V Cold Worked, Stress Relieved AMS 5561Steel
5、 Tubing, Welded and Drawn, Corrosion and Heat Resistant, 9.0Mn-20Cr-6.5Ni-0.28N, High-Pressure Hydraulic AMS 5656Steel Bars, Forgings, and Rings, Corrosion Resistant, 9.0Mn-20Cr-6.5Ni-0.27N AMS 5659Steel Bars, Forgings, Rings, and Extrusions, Corrosion Resistant, 15Cr-4.5Ni-0.03 (Cb + Ta) 3.5Cu, Con
6、sumable Electrode Melted, Solution Heat Treated AS478Identification Marking Methods ARP603Impulse Testing of Hydraulic Hose Assemblies, Tubing and Fittings RATIONALE This document has been reaffirmed to comply with the SAE 5-Year Review policy. SAE Technical Standards Board Rules provide that: “This
7、 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 therefrom, is the sole responsibility of the user.” SAE review
8、s 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 2007 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmi
9、tted, 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: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB
10、ADDRESS: http:/www.sae.org Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS1576 Revision C - 2 - 2.1 (Continued): ARP1185Flexur
11、e Testing of Hydraulic Tubing Joints and Fittings ARP1258Qualification of Hydraulic Tube Joints to Specified Flexure Fatigue Requirements AS1577Tube End, Welding, Hydraulic AS1578Bellmouth Tube End, Welding AS1579Fitting End, Welded Girth Joint, Dimensions, 3000 psi Hydraulic AS1580Ring, Tube Weld,
12、3000 psi Hydraulic, Titanium AS1581Sleeve, Flareless Tube End, Welded, Hydraulic, 3000 psi AS1582Union, Flareless Tube End, Welded, 3000 psi Hydraulic AS1583Tee, Tube Weld, 3000 psi Hydraulic AS1584Elbow, 90 Tube Weld, 3000 psi Hydraulic AS1585Reducer, Tube Weld, Hydraulic AS1893Ring, Tube Weld, 300
13、0 psi Hydraulic, CRES. 2.2U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. O-H-795Hydrofluoric Acid, Technical O-N-350Nitric Acid, Technical MIL-STD-129Marking for Shipment and Storage MIL-F-18280Fittings,
14、Flareless Tube, Fluid Connections MIL-H-5440Hydraulic Systems, Aircraft, Type I and II Design, Installation and Data Requirements for MIL-H-6875Heat Treatment of Steels, Process for MIL-STD-6866Inspection, Liquid Penetrant MS21921Nut, Sleeve Coupling, Flareless MS33514Fitting End Standard Dimensions
15、 for Flareless Tube Connection 2.3ANSI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002. ANSI/ASME B46.1 Surface Texture, Surface Roughness, Waviness, and Lay ANSI/ASQC Z1.4Sampling Procedures and Tables for Inspection by Attributes 2.4NAS Standards: Available from Nat
16、ional Standards Association, 1200 Quince Orchard Blvd, Gaithersburg, MD 20878. NAS 1760Fitting End, Fluid, Acom, Standard Dimensions for Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or
17、networking permitted without license from IHS -,-,- SAE AS1576 Revision C - 3 - 2.5ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM E 1447Test Method for Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Con
18、ductivity Method 2.6Other Publications: AWS A3.0Welding Terms and Definitions (American Welding Society) 3.REQUIREMENTS: 3.1Qualification: Fittings furnished under this document shall be products which have been subjected to and successfully passed the test requirements of this specification. 3.2Mat
19、erials: 3.2.1Fitting Materials: Fittings and other parts shall be made of materials listed in Table 1. 3.2.2Fitting Forgings: 3.2.2.1Surface Defects: Forged fittings shall be free from cracks, laps, seams and other defects. NOTE: Surface defects may be removed as long as wall thickness requirements
20、are met and as long as defects do not reappear after etching and in penetrant inspection. 3.2.2.2Titanium Forgings: Titanium forgings shall exhibit an equiaxed microstructure. Oxide or other gas contaminated surface scale shall be removed by pickling. TABLE 1 - Materials Copyright SAE International
21、Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS1576 Revision C - 4 - 3.3Design and Construction: Fittings and other parts shall be per the following stand
22、ards, as applicable: a.AS1577 b.AS1578 c.AS1579 d.AS1580 e.AS1581 f.AS1582 g.AS1583 h.AS1584 i.AS1585 j.AS1893 Tubing shall be to the requirements per AMS 4944 and AMS 5561, as applicable. Shape fittings such as elbows, tees, or crosses shall be machined from forgings or bar stock. Straight fittings
23、 shall be machined from bar stock. 3.3.1Passages: 3.3.1.1Drill Offset: On straight fittings where the fluid passage is drilled from each end, the offset between the drilled holes at the meeting point of the drills shall not exceed 0.015 in. 3.3.1.2Cross Section: On shape fittings, the cross sectiona
24、l area at the junction of the fluid passages shall not be smaller than the cross sectional area of the smaller passage. 3.4Cleaning: Parts that are to be cleaned to standard industry practice for fittings shall have no suffix code letter in the part number and shall be cleaned per 5.1.1. These parts
25、 may then have special cleaning as specified by the user prior to welding. Parts that are to be alkaline cleaned as suitable for welding shall have the suffix letter “C” in the part number and shall be cleaned per 5.1.2. Titanium alloy parts that are to be cleaned and nitric-hydrofluoric acid etched
26、 as suitable for welding shall have the suffix letter “E” in the part number and shall be cleaned and etched per 5.1.3. 3.5Identification of Product: All fittings, nuts, and sleeves shall be marked in accordance with the following instructions. The marking shall be applied per AS478 as specified on
27、the applicable drawing in a location not detrimental to the performance of the fitting and not detrimental to the corrosion protection of the fitting. When items cannot be physically marked because of lack of space or because marking would have a deleterious effect, the package shall provide the ide
28、ntification per 5.2. 3.5.1Manufacturers Identification: Unless otherwise specified, all fittings and sleeves shall be marked with the manufacturers name, CAGE code or trademark and with the letters AS. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913
29、977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS1576 Revision C - 5 - 3.5.2Material Identification: Fittings and sleeves shall be marked with the material code letter as shown in Table 1. Forged shapes such as elbows or tees,
30、 shall also be marked with the forging manufacturers trademark or a code identification letter or number. 3.5.3Marking for Part Number and Size: A numerical size code equivalent to the nominal tube size in .062 inch increments is optional. All fittings and sleeves larger than 06 fitting size code sh
31、all be marked with the basic part number, exclusive of size. Fitting or sleeve assemblies with assembled nuts shall be marked as above on the fitting body, but assembled nuts that have their own part number identification are acceptable. T-rings shall not be marked but the package shall be identifie
32、d per 5.2. 3.6Performance: Fitting samples per Table 2 welded to tubing shall be capable of meeting the requirements of 3.6.1, 3.6.2, 3.6.3, and 3.6.5 when tested per the test procedures specified in Section 4. 3.6.1Leakage: The welded fitting shall show no evidence of bubbles when immersed in water
33、 and pressurized to proof pressure of Table I of MIL-H-5540 for 5 min. 3.6.2Proof Pressure Test: The test assemble shall withstand proof pressure per MIL-H-5440 without leakage, evidence of permanent deformation at separable connectors, or other malfunction that would affect assembly or disassembly.
34、 3.6.3Impulse Test: The test assemblies shall withstand 200 000 impulse pressure cycles without leakage as specified in 3.6.1 or other failure. 3.6.4Burst: The test assemblies shall not rupture or leak in excess of that specified in 3.6.1 at pressures up to and including the values specified in MIL-
35、H-5440. 3.6.5Flexure: The test assemblies shall not rupture or leak in excess of that specified in 3.6.1 when flexure-fatigue tested to the requirements of ARP1258 or MIL-F-18280. 3.7Workmanship: All machined surfaces shall be smooth to 125 in Ra per ANSI/ASME B46.1. Unmachined areas, such as forged
36、 surfaces, shall be free of laps, seams, or other defects. Parting lines in forging shall blend smoothly with the forged body and shall have a finish of 250 in Ra as defined in ANSI/ASTM B 46.1. 4.QUALITY ASSURANCE PROVISIONS: 4.1Responsibility for Inspection and Test: Unless otherwise specified, th
37、e supplier is responsible for the performance of all inspection and test requirements specified herein. The suppliers may utilize their own facilities or other facilities which have been approved by the user. The user has the right to perform any of the inspections or tests set forth in this documen
38、t, as deemed necessary to assure that the parts conform with the specified requirements. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,
39、-,- SAE AS1576 Revision C - 6 - 4.2Material Certification: Tests for chemical composition and heat treat condition shall be performed to show conformance with the applicable requirements. Tensile and hardness test shall be performed to verify compliance with the mechanical properties of 3.2. Gas con
40、tent of titanium shall be controlled per AMS 4928, except that forgings shall comply with requirements under 3.2.2. Records of these tests shall be made available to the user upon request. 4.3Inspection Lot: A lot shall consist of all parts of a given part number made from the same batch of material
41、 and processed at the same time. The supplier shall maintain a record of inspections applied to each lot. 4.4Inspection Records: The supplier shall keep a complete record of all material certifications, examinations, inspections, and tests performed to verify conformance to the requirements of this
42、document. Such records shall be available upon request. 4.5Classification of Inspections: The testing and inspection shall be classified as follows: a.Qualification inspection b.Quality conformance inspection 4.6Qualification Inspection: 4.6.1Sampling Instructions: Qualification inspection shall be
43、conducted for each fitting or part standard as listed in Table 2 and for the sizes and materials used. 4.6.1.1Test Specimen Preparation: Specimens for proof, burst, and impulse tests shall be assembled as illustrated in Figure 1. Flexure test specimens shall be in accordance with ARP1185. Copyright
44、SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS1576 Revision C - 7 - TABLE 2 - Qualification Test Samples FIGURE 1 - Examples for Proof,
45、 Burst, and Impulse Test Specimen (Optional, Combined or Single) Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:44:13 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS1576 Revision
46、C - 8 - 4.6.1.2Tube Preparation: Tube ends to be welded shall be in accordance with AS1577 or AS1578, as applicable. Corrosion resistant steel specimens shall be alkaline cleaned or vapor degreased and then thoroughly drained and blown out to remove any remaining cleaning fluid. Titanium tubing shal
47、l be alkaline cleaned and then drained and blown out like the CRES tubing. No chlorinated solvents shall be used with titanium. Immediately prior to welding, the tube area that will be exposed to heat shall be solvent cleaned with MEK or acetone, unless specified otherwise. 4.6.2Weldments: 4.6.2.1We
48、ld Beads: Welds for test specimens shall be smooth and uniform in appearance, with 100% penetration and fusion of the mating tube and fitting end. Undercut, thinning, concavity, or overlap at the edge of the weld bead shall be unacceptable. Underfill shall be unacceptable, except that for titanium a local blended underfill of 10% of the thinner wall thickness is allowed as long as it does not exceed 50% of the weld circumference. Cracks, weld craters, or open holes in the weld are unacceptable, except that a local blended depression in