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 2015 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/MA2005B AEROSPACE STANDARD MA2005 REV. B Issued 1981-09 Revised 1995-12 Reaffirme
5、d 2015-08 Tube Fittings, Aerospace Fluid Systems, Separable, For 24 Cone, General Specification, Metric (ISO 7169) RATIONALE MA2005B has been reaffirmed to comply with the SAE five-year review policy. FOREWORDThis document is equivalent to ISO 7169 with the exception that U.S. materials, test and pr
6、ocess specifications are used where ISO standards are not available. The ISO 7169 is based on MIL-F-18280.This document establishes the basic performance and quality criteria for screw-together tube fitting assemblies and port connectors used in aerospace fluid systems.The performance test requireme
7、nts are intended to satisfy the most strenuous demands encountered in high-performance aircraft hydraulic systems. The procurement requirements are intended to ensure that fittings, which are procured in accordance with this specification, are of the same quality as the fittings used during the orig
8、inal qualification testing. Compliance with these test and procurement requirements is necessary for fittings that are used in control systems where a malfunction would affect the safety of flight.1. SCOPE:This document specifies performance and quality requirements for the qualification and manufac
9、ture of 24 cone fittings to ensure reliable performance in aircraft hydraulic systems.This document specifies baseline criteria for the design and manufacture of system fittings that are qualification tested on engines.This document covers fittings of temperature types and pressure classes specified
10、 in MA2001.SAE INTERNATIONAL MA2005B Page 2 of 17 2. REFERENCES:2.1 Applicable Documents: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 publications shall be the issue in eff
11、ect on the 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
12、 obtained.2.1.1 SAE Publications: Available from SA E, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2486 Conversion Coating of Titanium Alloys, Fluoride Phosphate TypeAMS 2488 Anodic Treatment, Titanium and Titanium AlloysAMS 4928 Titanium Alloy Bars and Forgings, 6Al-4V, Annealed, 120,000
13、psi (827 MPa)AMS 4952 Titanium Tubing, Seamless, Annealed, 40,000 psi (275 MPa) Yield StrengthAMS 4945 Tubing, Seamless Hydraulic, 3.0Al 2.5V Cold Worked and Stress Relieved, Texture ControlledAMS 5561 Tubing, Welded and Drawn, 9Mn 20Cr 6.5Ni High Pressure, HydraulicAMS 5658 Bars, Forgings and Rings
14、 15Cr 5Ni 4CuAMS 5659 Steel Bars, Forgings and Rings, 15Cr 5Ni 0.03(Cb+Ta) 4Cu Cons. El. MeltAS1055 Fire Resistance, Fire Test and Performance Requirements for Flexible Hose and Rigid Tube Assemblies (ISO 2685)MA2001 Aerospace Fluid Systems, Pressure and Temperature Classifications, metric (ISO 6771
15、)MA2016 Tubing Sizes and Wall Thicknesses, Hydraulic, Preferred Standards List, Metric (ISO 8575)MA2094 Test Methods for Tube-Fitting Assemblies, Metric (ISO 10583)2.1.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM A 108 Steel Bars, Carbon, Col
16、d Finished, Standard Quality, Specification forASTM E 1444 Heat Treatment of Aluminum Alloys2.1.3 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-S-5002 Surface Treatment and Metallic Coatings for Metal
17、 Surfaces of Weapon SystemsMIL-S-6758 Steel, Chrome-Molybdenum (4130) Bars and Reforging Stock (Aircraft Quality)SAE INTERNATIONAL MA2005B Page 3 of 17 2.1.3 (Continued):MIL-T-6845 Tubing, Steel, Corrosion Resistant (304) Aerospace Hydraulic Systems, 1/8 Hard ConditionMIL-I-6868 Inspection Process,
18、Magnetic ParticleMIL-T-7081 Tube, Aluminum Alloy, Seamless, Round, Drawn, Aircraft Hydraulic QualityMIL-A-8625 Anodic Coatings, for Aluminum and Aluminum AlloyMIL-T-9046 Titanium and Titanium Alloy Sheet, Strip, and PlateMIL-F-18280 Fittings, Flareless Tube, Fluid ConnectionMIL-STD-105 Sampling Proc
19、edures and Tables for Inspection by Attributes (ISO 2859)MIL-STD-810 Environmental Test MethodsQQ-P-35 Passivation Treatment for Corrosion Resistant SteelsQQ-A-225/6 Aluminum Alloy Bar, Rod and Wire; Rolled, Drawn or Cold Finished, 2024QQ-A-225/9 Aluminum Alloy Bar, Rod, Wire and Special Shapes, Rol
20、led, Drawn or Cold Finished, 7075QQ-A-367 Aluminum Alloy, Forgings, Heat TreatedQQ-P-416 Plating, Cadmium, ElectrodepositedQQ-S-637 Steel Bar, Carbon, Cold Finished (Standard Quality, Free Machining)QQ-S-763 Steel Bars, Shapes, and Forgings, Corrosion Resistant (304)QQ-S-763 Steel Bars, Shapes, and
21、Forgings, Corrosion Resistant (347)QQ-S-763 Steel Bars, Shapes, and Forgings, Corrosion Resistant (316)2.2 Commonly Referenced Organizations:2.2.1 ANSI Publications: Available from ASME, 345 E. 47th Street, New York, NY 10017.ANSI/ASME B46.1 Surface Texture (Surface Roughness, Waviness and Lay)2.3 R
22、elated Publications:The following publications are provided for information purposes only and are not a required part of this document. The documents are available from International Organization for Standardization, Case Postale 56, CH1211, Geneva 20, Switzerland.ISO 468:1982 Surface roughness - Pa
23、rameters, their values and general rules for specifying requirementsISO 2685:1992 Aircraft - Environmental conditions and test procedures for airborne equipment - Resistance to fire in designated fire zonesISO 2859-1:1989 Sampling procedures for inspection by attributes - Part 1: Sampling plans inde
24、xed by acceptable quality level (AQL) for lot-by-lot inspectionISO 6771:1987 Aerospace - Fluid systems and components - Pressure and temperature classificationsISO 6772:1988 Aerospace - Fluid systems - Impulse testing of hydraulic hose, tubing and fitting assembliesSAE INTERNATIONAL MA2005B Page 4 o
25、f 17 2.3 (Continued):ISO 7257:1983 Aircraft - Hydraulic tubing joints and fittings - Rotary flexure testISO 8575:1990 Aerospace - Fluid systems - Hydraulic system tubingISO 9538 Aerospace - Hydraulic tubing joints and fittings - Planar flexure testISO 10583:1993 Aerospace fluid systems - Test method
26、s for tube/fitting assemblies2.4 Definitions:2.4.1 For the purposes of this document, the following definitions apply.2.4.2 Workmanship and Surface Defects:2.4.2.1 SURFACE IRREGULARITY: Nonconformity with general surface appearance, possible defect.2.4.2.2 CRACK: Clean (crystalline) fracture passing
27、 through or across the grain boundaries that possibly follows inclusions of foreign elements. Cracks are normally caused by overstressing the metal during forging or other forming operations, or during heat treatment. Where parts are subject to significant reheating, cracks are usually discolored by
28、 scale.2.4.2.3 FOLD: Doubling over of metal, which can occur during the forging operation. Folds can occur at or near the intersection of diameter changes and are especially prevalent with noncircular necks, shoulders, and heads.2.4.2.4 LAP: Fold-like machining defect.2.4.2.5 SEAM:a. Usually a surfa
29、ce opening or crack resulting from a defect obtained during casting or forging.b. Extraneous material, stringer in the material, which is not homogeneous with base metal.2.4.2.6 PIT: Void or hole in the surface as caused, for example, by corrosion.2.4.2.7 LEAKAGE:a. Wetting or formation of a drop or
30、 drops of test fluid in pressure testing or of a bubble in pneumatic testing.b. Spillage of test fluid due to rupture.2.4.3 Fitting Components: Fitting components are designated as illustrated in Figure 1.SAE INTERNATIONAL MA2005B Page 5 of 17 FIGURE 1 - Fitting Assembly Part Designations2.4.4 Quali
31、ty Assurance:2.4.4.1 LOT: Manufacturers run of a given part number from the same batch of material, processed at the same time and in the same manner.2.4.4.2 QUALIFICATION TEST: Performance testing required to demonstrate successful performance of the fitting in simulated service, using overload, de
32、structive and accelerated tests.3. REQUIREMENTS:3.1 Qualification:Fittings claiming conformity with this document shall be representative of products which have successfully met the requirements and have passed the tests specified in this document.3.2 Materials:3.2.1 Fittings: The fitting parts shal
33、l be manufactured from materials as given in Table 1 or equivalents passing the specified qualification tests. The various materials shall be used according to the pressure and temperature requirements of the system (see Table 1).3.2.2 Tubing: The tubing used with the fittings shall be in accordance
34、 with MA2016 or equivalent tubing passing the specified qualification tests.3.3 Design and Manufacture:3.3.1 Threads: Threads may be cut, rolled or, except for titanium, ground. The external threads of fittings should be rolled and, if machined, shall have a roughness average, Ra, of 3.2 m or smooth
35、er.SAE INTERNATIONAL MA2005B Page 6 of 17 TABLE 1 - Materials, FittingsSAE INTERNATIONAL MA2005B Page 7 of 17 3.3.1.1 Rolled Threads: Laps, cracks, surface irregularities, and seams (see 2.4.2.5) are not acceptable on any part the pressure thread flank, in the threadroot or on the nonpressure thread
36、 flank. Laps and seams, whose depths are within the limits of Table 2, are acceptable on the crest and the nonpressure thread flank above the pitch diameter.3.3.2 Fluid Passages: On fittings where the fluid passage is drilled from each end, the offset between the drilled holes at the meeting point s
37、hall not exceed 0.4 mm. It shall be possible to pass through the fitting passage a ball whose diameter is 0.5 mm less than the minimum diameter specified for the passage.TABLE 2 - Maximum Depth of Laps and SurfaceIrregularities in Rolled Threads3.4 Surface Protection and Color Identification:3.4.1 S
38、urface Protection: The surfaces of fitting parts shall be protected in the following manner:a. Aluminum Alloy Fittings: By sulfuric acid anodizing, then dying and dichromate or nickel acetate sealing per MIL-A-8625 Type II, Class 2.b. Carbon Steel Fittings and Sleeves: By cadmium plating 0.007 to 0.
39、012 mm thick, followed by a chromate postplate treatment per QQ-P-416.c. Corrosion-Resistant Steel Fittings: By passivation treatment per QQ-P-35 Type IV or VII for 300 series CRES and Type II or VIII for 17-4 PH and 15-5 PH CRES. Sleeves may be cadmium plated.d. Titanium Fittings: By a fluoride con
40、version coating per AMS 2486 or anodizing process per AMS 2488.3.4.2 Color Identification: As a reference, the material of the finished fitting may be distinguished by the colors as shown in Table 3.SAE INTERNATIONAL MA2005B Page 8 of 17 3.5 Marking:Unless specified otherwise, parts shall be permane
41、ntly identified with the complete part number and the manufacturers trademark. The method of marking shall be laser marking, impression stamping, or electro-etching, in that order of preference. When the complete part number cannot be used in DN08 size and under because of the size of the part, the
42、marking may be limited to the basic part number, without size designation. The marking shall not be in a location detrimental to the part or its surface protection and should preferably be visible when the part is assembled. When material code letters are used, the code letter (see Table 3) shall al
43、so be laser marked, electro-etched, or impression stamped on the part.WARNING: Laser marking of thin wall titanium fittings may cause embrittlement and fatigue cracking.TABLE 3 - Material Codes and Colors3.6 Performance:The tubing/fitting assembly shall be capable of the performance specified in 3.6
44、.1 to 3.6.9.3.6.1 Proof Pressure: When tested in accordance with MA2094, the test assembly shall withstand pressure equal to twice the nominal pressure1without leakage, evidence of permanent deformation, or other malfunction that might affect the ability to disconnect or connect using the specified
45、range of torque values. All specimens, except tensile specimens, shall be proof tested.3.6.2 Pneumatic Pressure Tightness: When tested in accordance with MA2094, assemblies shall pass the gaseous pressure test to the specified nominal pressure without leakage or other failure. Six specimens shall be
46、 tested.3.6.3 Hydraulic Impulse Resistance: When tested in accordance with MA2002 and MA2094, the test assembly shall withstand 200 000 impulse pressure cycles without leakage. Six specimens shall be tested.1In accordance with ISO 8574:1990.SAE INTERNATIONAL MA2005B Page 9 of 17 3.6.4 Minimum Hydros
47、tatic Pressure Capability: When tested in accordance with MA2094, there shall be no leakage or burst at less than the specified minimum burst pressure. Tubing expansion is permissible. Six specimens shall be tested to failure.3.6.5 Flexure Resistance:3.6.5.1 Standard Rotary Flexure Test, Temperature
48、 Type II, Pressure Class D: When tested in accordance with MA2003 and MA2094, test assemblies shall not fail. Six specimens with straight unions shall be tested. Bulkhead tee fitting connections shall match the flexure fatigue life of straight unions. Two specimens with bulkhead tees shall be tested
49、.3.6.5.1.1 Basic Qualification Requirements for Testing to 107Cycles: Steel 24 cone fittings shall be used with type II, class D, cold-worked corrosion-resistant steel tubing per MIL-T-6845 and flexure fatigue tested to 135 MPa bending stress in sizes DN16 and under, and 108 MPa in sizes DN20 and over to a tolerance of %.NOTE: Under pressure and with dynamic load due to rotation, these stresses may be 172 MPa and 137 MPa respectively.3.
