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/AS7482B AEROSPACE STANDARD AS7482 REV. B Issued 1991-10 Revised 2009-09Reaffirmed
5、 2015-04 Superseding AS7482A Studs, Corrosion and Heat Resistant Steel, UNS S66286 Tensile Strength 130 ksi 1800 F Solution Heat Treated, Aged Before Roll Threading Procurement Specification FSC 5307 RATIONALE AS7482B has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE 1.1 T
6、ype This specification covers studs made from a corrosion and heat resistant, age hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286. The following specification designations and their properties are covered: AS7482 130 ksi minimum ultimate tensile str
7、ength at room temperature 70 ksi stress-rupture strength at 1200 F AS7482-1 130 ksi minimum ultimate tensile strength at room temperature 78 ksi minimum ultimate shear strength at room temperature AS7482-2 130 ksi minimum ultimate tensile strength at room temperature 1.2 Application Primarily for ae
8、rospace propulsion system applications where a good combination of strength and resistance to corrosion are required. AS7482 studs are intended for use at elevated temperatures in corrosion resistant steel parts. AS7482-1 studs are intended for studs loaded in shear. AS7482-2 studs are intended for
9、use where the coefficient of expansion of the stud is more compatible for use in aluminum or magnesium alloys. 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 spe
10、cification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity 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
11、. REFERENCES 2.1 Applicable Documents The following publications form 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 c
12、onflict between the text of this document and references cited herein, 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
13、 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA and Canada), www.sae.org. AMS2759/3 Heat Treatment Precipitation Hardening Corrosion-Resistant and Maraging Steel Parts AMS5731 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forg
14、ings, Tubing, and Rings 15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B - 0.30V Consumable Electrode Melted, 1800 F (982 C) Solution Heat Treated AMS5732 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings 15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V Consumable Electrode Melted 1800 F (982 C) Soluti
15、on and Precipitaion Heat Treated 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 Radius Root
16、with Increased Minor Diameter 2.1.2 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 112 Determining Average Grain Size ASTM E 139 Conduc
17、ting Creep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E 140 Standard Hardness Tables for Metals ASTM E 1417 Liquid Penetrant Examination ASTM D 3951 Commercial Packaging SAE INTERNATIONAL AS7482B 2 OF 192.1.3 AIA Publications Available from Aerospace Industries Association, Wilson
18、Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 973-358-1000, aia-aerospace.org. NASM1312-6 Fastener Test Methods, Method 6, Hardness NASM1312-8 Fastener Test Methods, Method 8, Tensile Strength NASM1312-10 Fastener Test Methods, Method 10, Stress Rupture NASM1312-13 Fastener Test Methods, Met
19、hod 13, Double Shear Test 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
20、 intercrystalline 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 la
21、p, seam, inclusion, crack, machining tear, or stringer. INCLUSION: Nonmetallic 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 a
22、nd 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 having its length equal to or greater than three times its width with a depth of 0.0005 inch when viewed at 200X magnifi
23、cation. 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, or dull cutting tools. PRODUCTION INSPECTION LOT: Shall be all finished parts of the same part number, made from a sin
24、gle heat of alloy, heat treated at the same time to the same specified condition, produced as one continuous run, and submitted for manufacturers inspection at the same time. SEAM: Longitudinal surface imperfection in the form of an unwelded, open fold in the material. STRINGER: A solid nonmetallic
25、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 the periphery of a part without any loose ends and is within the dimensional limits of the part. SAE INTERNATIONAL AS7482B 3 OF 192.3 Unit
26、 Symbols and Abbreviations - degree, angle C - degree Celsius F - degree Fahrenheit cm3 -cubic centimeter g - gram (mass) % - percent (1% = 1/100) lbf - pounds force ksi - kips (1000 pounds) per square inch sp gr - specific gravity HRC - hardness Rockwell C scale PD - pitch diameter 3. TECHNICAL REQ
27、UIREMENTS 3.1 Material Shall be AMS5731 corrosion and heat resistant steel heading stock or AMS 5732 corrosion and heat resistant steel. 3.2 Design Finished (completely manufactured) parts shall conform to the following requirements: 3.2.1 Dimensions The dimensions of finished parts, after all proce
28、ssing including plating or coating, shall conform to the part drawing. Dimensions apply after plating but before coating with solid 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 drawin
29、g, determined in accordance with ASME B46.1. 3.2.3 Threads Screw thread shall be UNJ profile and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing. Tolerances for pitch diameter of the stud end thread shall be as specified on the part drawing. The special
30、stud end thread variations shall be in accordance with AS3062 for the following requirements: a. Lead and half-angle variation b. Taper c. Out-of-roundness d. Stud lead threads e. Stud thread runout SAE INTERNATIONAL AS7482B 4 OF 193.2.3.1 The requirements for thread crest variations, locking holes
31、in the nut end thread, incomplete lead threads and thread runout in the nut end threads shall be as 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 toleran
32、ces specified on the part drawing and, where applicable, controlled in accordance with AS3063. 3.3 Fabrication 3.3.1 Blanks Heads shall be machined sufficiently to remove surface defects. Blanks may be produced by machining, upsetting, extruding or a combination of these methods. Heading stock to be
33、 upset shall not be heated to a temperature higher than 2100 F. 3.3.1.1 When a shoulder or shoulders are produced by upsetting, the metal removed from the bearing surface shall be as little as practicable to provide a clean, smooth surface. 3.3.2 Heat Treatment Shall conform to the technical require
34、ments and other provisions specified in AMS2759/3 for A-286, 1800 F solution treatment, and 1325 F aging treatment. 3.3.2.1 Solution Heat Treatment: Blanks, unless machined from solution heat treated stock or AMS5732 steel, shall be solution heat treated as in 3.3.2. 3.3.2.2 Aging Treatment: Solutio
35、n heat treated blanks shall be heat treated by aging as in 3.3.2. 3.3.3 Oxide Removal Surface oxide and oxide penetration resulting from prior heat treatment shall be removed from the full body diameter and bearing surface of shoulders, as applicable, of the solution heat treated and aged blanks pri
36、or to rolling the threads. The oxide removal process shall produce no intergranular attack or corrosion of the blanks. 3.3.4 Thread Rolling Threads shall be formed on the heat treated and finished blanks by a single cold rolling process for each end after removal of oxide as in 3.3.3. 3.3.5 Cleaning
37、 Parts, after finishing, shall be degreased and submerged 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 nitric acid (sp gr 1.42) and 4 volumes o
38、f 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. 3.3.5.1 Water Rinse: Immediately after removal from the cleaning solution, the parts shall be thoroughly rinsed in (70 to 200 F) water. SAE INTERNA
39、TIONAL AS7482B 5 OF 193.4 Product Marking Each part shall be marked for oversize on the stud end thread and for material code on the nut end thread as specified by the part drawing. The markings may be formed by stamping, depressed 0.010 inch maximum, with rounded root form on depressed characters.
40、3.5 Mechanical Properties Where AS7482 is specified, parts shall conform to the requirements of 3.5.1, 3.5.2, and 3.5.4. Where AS7482-1 is specified, parts shall conform to the requirements of 3.5.1, 3.5.2, and 3.5.3. Where AS7482-2 is specified, parts shall conform to the requirements of 3.5.1 and
41、3.5.2. 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 to three full thread turns from the thread runout exposed b
42、etween the loading fixtures during the tensile and stress-rupture tests. AS7482 finished parts shall be tested in accordance with the following test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM1312-6 b. Ultimate Tensile Strength at Room Temperature: MIL-STD-1312-8 in accordance with
43、NASM1312-8 c. Stress-Rupture Strength at 1200 F: MIL-STD-1312-10 in accordance with NASM1312-10 AS7482-1 finished parts shall be tested in accordance with the following test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM1312-6 b. Ultimate Tensile Strength at Room Temperature: MIL-STD-1
44、312-8 in accordance with NASM1312-8 c. Ultimate Double Shear Strength at Room Temperature: MIL-STD-1312-13 in accordance with NASM1312-13 AS7482-2 finished parts shall be tested in accordance with the following test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM1312-6 b. Ultimate Tensi
45、le Strength at Room Temperature: MIL-STD-1312-8 in accordance with NASM1312-8 3.5.1 Ultimate Tensile Strength at Room Temperature 3.5.1.1 Finished Parts: Parts shall have an ultimate tensile load not lower than that specified in Table 2 and shall be tested to failure in order to observe fracture loc
46、ation, 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 (smal
47、ler thread root diameter for studs with unequal size threads) or having an undercut, parts shall have an ultimate tensile strength not lower than 130 ksi; for such parts, the diameter of the area on which stress is based shall be the actual measured minimum diameter of the part. SAE INTERNATIONAL AS
48、7482B 6 OF 193.5.1.2 Machined Test Specimens: If the size or shape of the part is such that a tensile test cannot be made on the part, tensile tests shall be conducted in accordance with ASTM E 8 on specimens prepared as in 4.4.7. Specimens may be required by the purchaser to perform confirmatory te
49、sts. Such specimens shall meet the following requirements: a. Ultimate Tensile Strength, minimum: 130 ksi b. Yield Strength at 0.2% Offset, minimum: 85 ksi c. Elongation in 2 inches or 4D, minimum: 15% d. Reduction of Area, minimum: 20% 3.5.1.2.1 When permitted by purchaser, hardness tests on the end of parts may be substituted for tensile tests of machined specimens. 3.5.2 Hardness Shall be uniform with
