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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 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/AS7469AAEROSPACESTANDARDAS7469A Issued 1993-04 Reaffirmed 2004-07 Revised 2011-02Superseding AS7
5、469 Bolts and Screws, UNS N07041 Nickel Alloy, Corrosion and Heat Resistant, 155 ksi, Procurement Specification FSC 5306 RATIONALE To Revise paragraph 2.3 to add definitions, update paragraph 3.6 by adding “two to” three threads in agreement with NASM1312 test methodology and general updating of spe
6、cifications and SAE formatting requirements. 1. SCOPE 1.1 Type This procurement specification covers bolts and screws made from a corrosion and heat resistant, age hardenable, nickel base alloy of the type identified under the Unified Numbering System as UNS N07041 and of 155 ksi tensile strength at
7、 room temperature, with maximum test temperature of parts at 1400 F. 1.2 Application Primarily for aerospace propulsion system applications where parts are required to have high strength and good resistance to relaxation up to 1600 F and oxidation resistance up to 1800 F. 1.3 Safety - Hazardous Mate
8、rials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity
9、 with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest i
10、ssue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this documen
11、t, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. SAE AS7469A Page 2 of 212.1.1 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
12、 USA), www.sae.org.AMS2750 Pyrometry AMS5712 Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings 53Ni 19Cr 11Co 9.8Mo 3.2Ti 1.6Al 0.006B Vacuum Melted, Solution Heat Treated Precipitation Hardenable AS1132 Bolts, Screws and Nuts - External Wrenching UNJ Thread, Inch - Design Standa
13、rd AS3062 Bolts, Screws, and Studs, Screw Thread Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter 2.1.2 AIA Publications AIA Publications: Available from Aerospace Industries As
14、sociation, 1000 Wilson Boulevard, Suite 1700, Arlington,VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org.NASM1312-6 Fastener Test Methods, Method 6, Hardness NASM1312-8 Fastener Test Methods, Method 8, Tensile Strength, Room Temperature NASM1312-10 Fastener Test Methods, Method 10, Stress Rup
15、ture NASM1312-18 Fastener Test Methods, Method 18 , Tensile Strength, Elevated Temperatures Class lll (1400 F)2.1.3 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O.Box Box 2900, Fairfield, NJ 07007-2900 Tel 973-882-1170, www.asme.orgASME B46.1 Surface Tex
16、ture (Surface Roughness, Waviness, and Lay) 2.1.4 ASTM Publications 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 Tension Testing of Metallic Materials ASTM E 21 Elevated Temperature Tests of Metall
17、ic Materials ASTM E 112 Determining Average Grain Size ASTM E 139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E 1417 Standard Practice for Liquid Penetrant Inspection SAE AS7469A Page 3 of 212.1.5 U.S. Government Publications Available from the Document Autom
18、ation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.MIL-STD-2073-1 DoD Materiel Procedures for Development and Application of Packaging Requirements 2.2 Definitions DEFECTIVE: A unit of product
19、which contains one or more defects. BURR: A rough edge or ridge left on the metal due to a cutting, grinding, piercing or blanking operation. COLD ROLLING: Forming material below the recrystallization temperature. CRACK: Rupture in the material which may extend in any direction and which may be inte
20、rcrystalline or transcrystalline in character. DEFECT: Any nonconformance of the unit of product with specified requirements. DISCONTINUITY: An interruption in the normal physical structure or configuration of a part, such as a lap, seam,inclusion, crack, machining tear, or stringer. INCLUSION: Nonm
21、etallic particles originating from the material making process. They may exist as discrete particles or strings of particles extending longitudinally. LAP: Surface imperfection caused by folding over metal fins or sharp corners and then rolling or forging them into thesurface. The allowable lap dept
22、h shall not exceed the limit specified herein. The minimum condition that shall be rated as a lap is a fold having its length equal to or greater than three times its width with a depth of 0.0005 in when viewed at X200 magnification. MACHINING TEAR: A pattern of short, jagged individual cracks, gene
23、rally at right angles to the direction of machining, frequently the result of improperly set cutting tools, or dull cutting tools. PRODUCTION INSPECTION LOT: Shall be all finished parts of the same part number, made from a single heat of alloy,heat treated at the same time to the same specified cond
24、ition, produced as one continuous run, and submitted for vendors inspection at the same time. SEAM: Longitudinal surface imperfection in the form of an unweld, open fold in the material. STRINGER: A solid nonmetallic impurity in the metal bar, often the result of inclusions that have been extended d
25、uring the rolling process. 2.3 Unit Symbols F degree Fahrenheit % percent (1% = 1/100) ft3cubic feet h hour in inch lbf pound-force SAE AS7469A Page 4 of 21ksi kips (1000 pounds) per square inch min minute of time sp gr specific gravity g gram cm3cubic centimeter HRC hardness, Rockwell C scale 3. TE
26、CHNICAL REQUIREMENTS 3.1 Material Shall be AMS5712 heading stock. 3.2 Design Finished (completely manufactured) parts shall conform to the following requirements: 3.2.1 Dimensions The dimensions of finished parts, after all processing, including plating, shall conform to the part drawing. Dimensions
27、 apply after plating but before coating with dry film lubricants. 3.2.2 Surface Texture Surface texture of finished parts, prior to plating or coating, shall conform to the requirements as specified on the part drawing, determined in accordance with ASME B46.1. 3.2.3 Threads Screw thread UNJ profile
28、 and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing. 3.2.3.1 Incomplete Threads Incomplete threads are permissible at the chamfered end and the juncture of the unthreaded portion of the shank or adjacent to the head as specified in AS3062. 3.2.3.2 Chamf
29、er The entering end of the thread shall be chamfered as specified on the part drawing. 3.2.4 Geometric Tolerances Part features shall be within the geometric tolerances specified on the part drawing and, where applicable, controlled in accordance with AS3063. 3.3 Fabrication 3.3.1 Blanks Heads shall
30、 be formed by hot forging or cold forging; machined heads are not permitted, except lightening holes may be produced by any suitable method. Wrenching recesses may be forged or machined. Flash or chip clearance in machined recesses shall not cause recess dimensions to exceed the specified limits. SA
31、E AS7469A Page 5 of 213.3.2 Heat Treatment Headed blanks shall, before finishing the shank and the bearing surface of the head, cold working the head-to-shank fillet radius and rolling the threads, be solution heat treated as follows; precipitation heat treatment shall follow cold working of the fil
32、let radius and rolling the threads. 3.3.2.1 Heating Equipment Furnaces may be any type ensuring uniform temperature throughout the blanks being heated and shall be equipped with, and operated by, automatic temperature controllers and data recorders conforming to AMS2750. The heating medium or atmosp
33、here shall cause no surface hardening by carburizing or nitriding. The total sulfur content of the atmosphere shall be maintained at less than 5 grains per 100 ft3.3.3.2.2 Solution Heat Treatment Blanks shall be solution heat treated by uniformly heating to 2050 F 25 F, holding at heat for 30 min, a
34、nd quenching at a cooling rate equivalent to air cool or faster. 3.3.2.3 Precipitation Heat Treatment After cold working the fillet radius as in 3.3.4 and rolling the threads as in 3.3.5, parts shall be precipitation heat treated by heating to 1650 F 15 F, holding at heat for 4 h 0.25 h, and cooling
35、 in air. Parts should be heated rapidly through the temperature range 1200 to 1400 F. 3.3.3 Oxide Removal Surface oxide and oxide penetration resulting from prior heat treatment shall be removed from the full body diameter and the bearing surface of the head of the solution heat treated blanks prior
36、 to cold working the underhead fillet radius and rolling the threads. The oxide removal process shall produce no intergranular attack or corrosion of the blanks. The metal removed from the bearing surface of the head and the full body diameter of the shank shall be as little as practicable to obtain
37、 a clean, smooth surface and, in no case, shall be so great as to produce more cutting of flow lines in the head-to-shank junction than shown in Figure 1B. 3.3.4 Cold Working of Fillet Radius After removal of oxide as in 3.3.3, the head-to-shank fillet radius of parts having the radius complete thro
38、ughout the circumference of the part shall be cold worked sufficiently to remove all visual evidence of grinding or tool marks. Distortion due to cold working shall conform to Figure 2, unless otherwise specified on the part drawing. It shall not raise metal more than 0.002 in above the contour at “
39、A“ or depress metal more than 0.002 in below the contour at “B“ as shown in Figure 2; distorted areas shall not extend beyond “C“ as shown in Figure 2. In configurations having an undercut associated with the fillet radius, the cold working will be required only for 90 degrees of fillet arc, startin
40、g at the point oftangency of the fillet radius and the bearing surface of the head. For shouldered bolts having an unthreaded shank diameter larger than the thread major diameter and having an undercut associated with a fillet between the threaded shank and the shoulder of the unthreaded shank, the
41、cold working will be required only for 90 degrees of fillet arc, starting at the point of tangency of the fillet radius and the shouldered surface of the unthreaded shank. 3.3.5 Thread Rolling Threads shall be formed on the finished, solution heat treated blanks by a single rolling process after rem
42、oval of oxide as in 3.3.3. SAE AS7469A Page 6 of 213.3.6 Cleaning Parts, after finishing, shall be degreased and then immersed in one of the following solutions for the time and temperature shown: a. One volume of nitric acid (sp gr 1.42) and 9 volumes of water for not less than 20 min at room tempe
43、rature. b. One volume of nitric acid (sp gr 1.42) and 4 volumes of water for 30 to 40 min at room temperature. c. One volume of nitric acid (sp gr 1.42) and 4 volumes of water for 10 to 15 min at 140 to 160 F. 3.4 Product Marking Each part shall be identification marked as specified on the part draw
44、ing. Unless otherwise specified on the part drawing, markings may be formed by forging or stamping, raised or depressed 0.010 in maximum with rounded root form on depressed characters. 3.5 Plating Where required, surfaces shall be plated as specified by the part drawing. 3.6 Mechanical Properties Pa
45、rts shall conform to the requirements of 3.6.1, 3.6.2, and 3.6.3. Threaded members of gripping fixtures for tensile and stress-rupture tests shall be of sufficient size and strength to develop the full strength of the part without stripping the thread. The loaded portion of the shank shall have two
46、to three full thread turns from the thread runout exposed beween the loading fixtures during the tensile and stress-rupture tests. Finished parts shall be tested in accordance with the following applicable test methods: a. Hardness: NASM1312-6 b. Room Temperature Ultimate Tensile Strength: NASM1312-
47、8 c. Stress-Rupture Strength at 1350 F NASM1312-10 d. Ultimate Tensile Strength at 1400 F: NASM1312-18 3.6.1 Ultimate Tensile Strength 3.6.1.1 At Room Temperature 3.6.1.1.1 Finished Parts Parts shall have an ultimate tensile load not lower than that specified in Table 2 and shall be tested to failur
48、e, first measuring and recording the maximum tensile load achieved. If the size or shape of the part is such that failure would occur outside the threaded section but the part can be tested satisfactorily, such as parts having a shank diameter equal to or less than the thread root diameter or having
49、 an undercut, parts shall have an ultimate tensile strength not lower than 155 ksi; for such parts, the diameter of the area on which stress is based shall be the actual measured minimum diameter of the part. Tension fasteners with either standard double hexagon or hexagon type heads having a minimum metal condition in the head equal to the design parameters specified in AS1132 shall not fracture in the h
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