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 2013 SAE International All rights reserved. No part of this pub
3、lication 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
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS7467BAEROSPACESTANDARDAS7467 REV. B Issued 1991-01 Reaffirmed 2006-05 Revised 2013
5、-06 Superseding AS7467A Bolts and Screws, Nickel Alloy, UNS N07718 Tensile Strength 185 ksi Stress Rupture Rated Procurement Specification FSC 5306 RATIONALEUpdate all references including update to AS8879 thread specification, clarify requirements for cold working the under head filet radius, and g
6、eneral editorial update. 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 N07718. The following specification designations and their pro
7、perties are covered: AS7467 185 ksi minimum ultimate tensile strength at room temperature 145 ksi minimum ultimate tensile strength at 1200 F 100 ksi stress rupture strength at 1200 F AS7467-1 185 ksi minimum ultimate tensile strength at room temperature 111 ksi minimum ultimate shear strength at ro
8、om temperature 1.2 Application Primarily for aerospace propulsion systems applications where a good combination of tensile strength, stress rupture strength, and resistance to relaxation is required for use up to approximately 1200 F; also, where a good combination of tensile strength, and shear str
9、ength is required. 1.3 Safety - Hazardous Materials 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 re
10、sponsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and take necessary precautionary measures to ensure the health and safety of all personnel involved. SAE AS7467B Page 2 of 25 2. REFERENCES 2.1 Applicable Documents The following publications form
11、a part of this document to the extent specified herein. The latest issue 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,
12、 the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (ins
13、ide USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2750 Pyrometry AMS5662 Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 52.5Ni - 19Cr - 3.0Mo - 5.1Cb (Nb) - 0.90Ti - 0.50Al - 18Fe, Consumable Electrode or Vacuum Induction Melted, 1775 F (968 C) Solution Heat Tr
14、eated, Precipitation-Hardenable AS1132 Bolts, Screws and Nuts - External Wrenching, UNJ Thread, Inch - Design Standard AS3062 Bolts, Screws and Studs, Screw Thread Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS8879 Screw Threads - UNJ Profile, Inch, Controlled Root R
15、adius and Increased Minor Diameter 2.1.2 AIA/NAS Publications Available from Aerospace Industries Association, 1000 Wilson Boulevard Suite 1700, Arlington, VA 22209-3928. Tel: 703-358-1000. www.aia-aerospace.orgNASM1312-6 Fastener Test Methods, Method 6, Hardness NASM1312-8 Fastener Test Methods, Me
16、thod 8, Tensile Strength NASM1312-11 Fastener Test Methods, Method 10,Stress Rupture NASM1312-13 Fastener Test Methods, Method 13, Double Shear Test NASM1312-18 Fastener Test Methods, Method 18, Elevated Temperature Tensile Strength 2.1.3 ASTM Publications Available from ASTM International, 100 Barr
17、 Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D3951 Commercial Packaging ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials ASTM E21 Elevated Temperature Tension Tests of Metallic Materials SAE AS7467B Page 3 of 25 ASTM
18、E112 Determining Average Grain Size ASTM E139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E140 Standard Hardness Conversion Tables for Metals, Relationship Among Brinell Hardness, Vickers Harness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, and S
19、clerscope HardnessASTM E1417/E1417M Standard Practice for Liquid Penetrant Testing 2.1.4 ASME Publication Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org.ASME B46.1 Surface Texture (Surface Roughness, Wav
20、iness, and Lay) 2.2 Definitions 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 recrystallation temperature. CRACK: Rupture in the material which may extend in any direction and which may be intercrys
21、talline or transcrystalline in character.DEFECT: Any nonconformance of the unit of product with specified requirements. DEFECTIVE: A unit of product which contains one or more defects. DISCONTINUITY: An interruption in the normal physical structure or configuration of a part; such as a lap, seam, in
22、clusion, crack, machining tear, or stringer. HEAT PATTERN: A discernible difference in etched appearance between the head and shank caused by the plastic forming of the head. INCLUSION: Nonmetallic particles originating from the material making process. They may exist as discrete particles or string
23、s of particles extending longitudinally. LAP: Surface imperfection caused by folding over metal fins or sharp corners and then rolling or forging them into the surface. The allowable lap depth shall not exceed the limit specified herein. The minimum condition that shall be rated as a lap is a fold h
24、aving its length equal to or greater than three times its width with a depth of 0.0005 inch when viewed at 200X magnification. MACHINING TEAR: A pattern of short, jagged individual cracks, generally at right angles to the direction of machining, frequently the result of improperly set cutting tools,
25、 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 condition, produced as one continuous run, and submitted for vendors inspection at the same time. SEAM: Longit
26、udinal surface imperfection in the form of an unwelded, open fold in the material. SAE AS7467B Page 4 of 25 STRINGER: A solid nonmetallic impurity in the metal bar, often the result of inclusions that have been extended during the rolling process. TIGHT BURR: A burr closely compacted and binding in
27、the periphery of a part without any loose ends and is within the dimensional limits of the part. 2.3 Unit Symbols and Abbreviations C - degree, Celsius F - degree Fahrenheit HRC - hardness Rockwell C scale lbf - pounds force % - percent (1% = 1/100) sp gr - specific gravity ksi - kips (1000 pounds)
28、per square inch 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be AMS5662 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 par
29、t drawing. Dimensions 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 Scr
30、ew thread UNJ profile and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing.3.2.3.1 Incomplete Lead and Runout Threads Incomplete threads are permissible at the entering end and the juncture of the unthreaded portion of the shank or adjacent to the head as
31、 specified in AS3062. 3.2.3.2 Chamfer 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. SAE A
32、S7467B Page 5 of 25 3.3 Fabrication 3.3.1 Blanks Heads shall be formed by hot or cold forging; temperature for hot forging blanks shall be within the range of 1650 to 2000 F. Machined heads are not permitted, except lightening holes may be produced by any suitable method. Wrenching recesses may be f
33、orged or machined. Flash or chip clearance in machined recesses shall not cause recess dimensions to exceed the specified limits. 3.3.2 Heat Treatment Headed blanks, before finishing the shank and the bearing surface of the head, cold rolling the head-to-shank fillet radius, and rolling the threads,
34、 shall be solution heat treated as follows; precipitation heat treatment shall follow cold working of the fillet radius and rolling the threads. 3.3.2.1 Heating Equipment Furnaces may be any type ensuring uniform temperature throughout the parts being heated and shall be equipped with, and operated
35、by, automatic temperature controllers and data recorders conforming to AMS2750. The heating medium or atmosphere shall cause no surface hardening by carburizing or nitriding. 3.3.2.2 Solution Heat Treatment Headed blanks shall be solution heat treated by heating to a temperature within the range 172
36、5 to 1850 F, holding at the selected temperature within 25 F for 1 hour 0.1 hour, and quenching in oil, water, or an inert gas. 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 heat
37、ing to 1325 F 15 F in a controlled atmosphere, holding at heat for 8 hours 0.25 hour, furnace cooling at 100 F 15 F per hour to 1150 F 15 F, holding at 1150 F 15 F for 8 hours 0.25 hour and cooling at a rate equivalent to air cool. Instead of the 100 F per hour cooling rate to 1150 F 15 F, parts may
38、 be furnace cooled at any rate provided the time at 1150 F 15 F is adjusted to give a total precipitation heat treatment time of approximately 18 hours. 3.3.3 Oxide Removal Surface oxide and oxide penetration resulting from prior heat treatment shall be removed from the full body diameter and bearin
39、g surface of the head of the solution heat treated blanks prior 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 di
40、ameter of the shank shall be as little as practicable to obtain a clean, smooth surface. 3.3.4 Cold Rolling of Fillet Radius After removal of oxide as in 3.3.3, the head-to-shank fillet radius of headed parts having the radius complete throughout the circumference of the part shall be cold rolled. T
41、he cold rolling shall be sufficient to remove all visual evidence of grinding or tool marks. Distortion due to cold rolling shall conform to Figure 2, unless otherwise specified on the part drawing. It shall not raise metal more than 0.002 inch above the contour at “A” or depress metal more than 0.0
42、02 inch 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 connected with the fillet radius, the cold rolling will be required only for 90 degrees of fillet arc, starting at the point of tangency of th
43、e 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 connected with a fillet between the threaded shank and the shoulder of the unthreaded shank, the cold working will be required o
44、nly for 90 degrees of fillet arc, starting at the point of tangency of the fillet radius and the shouldered surface of the unthreaded shank.SAE AS7467B Page 6 of 25 3.3.5 Thread Rolling Threads shall be formed on the finished, solution heat treated blanks by a single cold rolling process after remov
45、al of oxide as in 3.3.3. 3.3.6 Cleaning Parts, after finishing, shall be degreased and 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 minutes at room temperature. b. One volume of nit
46、ric acid (sp gr 1.42) and 4 volumes of water for 30 to 40 minutes at room temperature. c. One volume of nitric acid (sp gr 1.42) and 4 volumes of water for 10 to 15 minutes at 140 to 160 F. Immediately after removal from the cleaning solution, parts shall be thoroughly rinsed in clean water at 70 to
47、 200 F. 3.4 Product Marking Each part shall be identification marked as specified by the part drawing. The markings may be formed by forging or stamping, raised or depressed not more than 0.010 inch maximum, with rounded root form on depressed characters. 3.5 Plating Where required, surfaces shall b
48、e plated as specified by the part drawing; plating thickness determined in accordance with plating specification. 3.6 Mechanical Properties Where AS7467 is specified, parts shall conform to the requirements of 3.6.1, 3.6.2, 3.6.3, and 3.6.4. Where AS7467-1 is specified, parts shall conform to the re
49、quirements of 3.6.1, 3.6.3, and 3.6.5. 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. AS7467 finished parts shall be tested in accordance with the following applicable test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM1312-6 b. Ultimate Tensile Str
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