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/AS5270AEROSPACESTANDARDAS5270Issued 2013-09 Bolts, Screws and Studs, Nickel Alloy, U
5、NS N07718 Work-Strengthened, Tensile Strength 220 ksi Procurement Specification FSC 5306RATIONALEProvide industry with a 220 ksi procurement specification for bolts, screws and studs. 1. SCOPE 1.1 Type This procurement specification covers bolts, screws and studs made from a work-strengthened corros
6、ion and heat resistant, age Hardenable nickel base alloy of the type identified under the Unified Numbering System as UNS N07718. The following properties are covered:220 ksi minimum ultimate tensile strength at room temperature 180 ksi minimum ultimate tensile strength at 900 F 114 ksi tension to 1
7、1.4 ksi tension fatigue at room temperature 1.2 Application Primarily for aerospace propulsion systems applications where a good combination of tensile strength, fatigue strength, resistance to relaxation and shear strength is required for use up to approximately 900 F. 1.3 Safety- Hazardous Materia
8、ls 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 wi
9、th 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 INTERNATIONAL AS5270 Page 2 of 21 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the exten
10、t 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, the text of this document takes pre
11、cedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (out
12、side 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 Treated, Precipitation-Hardenable AMS5962
13、 Nickel Alloy, Corrosion and Heat-Resistant, Bars and Wire, 52.5Ni - 19Cr - 3.0Mo - 5.1Cb - 0.90Ti - 0.50AI - 18Fe, Consumable Electrode or Vacuum Induction Melted, 1775 F (968 C) Solution Treated and Work Strengthened, Precipitation Hardenable AS1132 Bolts, Screws and Nuts - External Wrenching, UNJ
14、 Thread, Inch - Design Standard AS3062 Bolts, Screws, and Studs, Screw Thread Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS3658 Bolt, Machine - Double Hexagon Extended Washer Head, Close Tolerance Shank, Cobalt-Nickel Alloy, UNS R30159, 260 ksi Min AS3659 Bolt, Mach
15、ine - Double Hexagon Extended Washer Head, Drilled, Close Tolerance Shank, Cobalt-Nickel Alloy, UNS R30159, 260 ksi MinAS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter 2.1.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O.
16、 Box C700, West Conshohocken, PA 19428- 2959, Tel: 610-832-9585, www.astm.org.ASTM E8 Tension Testing of Metallic Materials ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E112 Determining Average Grain Size ASTM E1417 Liquid Penetrant Examination ASTM D3951 Commercial Packagi
17、ng SAE INTERNATIONAL AS5270 Page 3 of 21 2.1.3 AIA-NASC Publication Available from Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org.NASM1312-8 Fastener Test Methods, Method 8, Tensile Strength NASM1312-11 Fastener
18、 Test Methods, Method 11, Tension Fatigue NASM1312-18 Fastener Test Methods, Method 18, Elevated Temperature Tensile Strength NASM21296 Bolt, Tension, Steel, 260 ksi FTU, 450 deg F, External Wrenching, Spline Drive, Flanged Head NASM14181 Bolt, Tension, Nickel Alloy 718, 220 ksi FTU, External Wrench
19、ing, Spline Drive, Flanged Head2.1.4 ASME Publication Available from ASME, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org.ASME B46.1 Surface Texture (Surface Roughness, Waviness, an
20、d Lay) 2.2 Definitions BURR: A rough edge or ridge left on the metal due to a cutting, grinding, piercing blanking operation. 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. DEFECT: Any nonconformanc
21、e of the unit of product with specified requirements. DEFECTIVE: A unit of product which contains one or more defects. COLD ROLLING: Forming material below the recrystallization temperature. DISCONTINUITY: An interruption in the normal physical structure or configuration of a part; such as a lap, se
22、am, inclusion, crack, machining tear, or stringer. CRACK: Rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character.SEAM: Longitudinal surface imperfection in the form of an un-welded, open fold in the material. LAP: Surface imperfec
23、tion 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 having its length equal to or greater than three times its widt
24、h with a depth of 0.0005 inch when viewed at 200X magnification. INCLUSION: Non-metallic particles originating from the material making process. They may exist as discrete particles or strings of particles extending longitudinally. STRINGER: A solid non-metallic impurity in the metal bar, often the
25、result of inclusions that have been extended during the rolling process. SAE INTERNATIONAL AS5270 Page 4 of 21 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
26、 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. HEAT PATTERN: The discernibl
27、e difference in etched appearance between the head and shank caused by the plastic forming of the head. 2.3 Unit Symbols - degree, angle C - degree, Celsius F - FahrenheitHRC - hardness Rockwell C scale Ibf - pounds force % - percent (1% = 1/100)sp gr - specific gravityksi - kips (1000 pounds) per s
28、quare inch 3. TECHNICAL REQUIREMENTS 3.1 Material Shall be AMS5962 or AMS5662 heading stock sufficiently cold worked to meet the mechanical property requirements of this specification. 3.2 Design Finished (completely manufactured) parts shall conform to the following requirements: 3.2.1 Dimensions T
29、he dimensions of finished parts, after all processing, including plating, 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 requir
30、ements as specified on the part drawing, determined in accordance with ASME B46.1. 3.2.3 Screw Threads Screw thread UNJ profile and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing.SAE INTERNATIONAL AS5270 Page 5 of 21 3.2.3.1 Incomplete Lead and Runout T
31、hreads Incomplete threads are permissible at the entering end and the juncture of the unthreaded portion of the shank or adjacent to the head 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 fe
32、atures 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 3.3.1.1 Bolts and Screws Heads shall be formed by hot or cold forging; Machined heads are not permitted, except lightening holes may
33、 be produced by any suitable method. 3.3.1.2 Studs Blanks may be machined from bar stock. The smaller diameter or nut end of blanks for stepped studs may be reduced as necessary; the larger diameter or stud end may be upset. For shoulder studs and double ended bolts, material shall be swaged so that
34、 flow lines follow approximate configuration of shoulder and transverse axis of flow lines occur at approximate center of shoulder as shown in Figure 1B. 3.3.2 Heat Treatment Before finishing the shank and the bearing surface of the head, cold rolling the head-to-shank fillet radius, and rolling the
35、 threads, blanks shall be heat treated as follows: 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. Pyrometry shall be in accordance with AMS2750. The hea
36、ting medium or atmosphere shall cause no surface hardening. 3.3.2.2 Precipitation Heat Treatment After heading (extruding, upsetting, and swaging) as applicable, the blanks shall be precipitation heat treated by heating to 1325 F 15 F in a controlled atmosphere, holding at heat for 8 hours 0.25 hour
37、, 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 to1150 F 15 F the blanks maybe furnace cooled at any rate provided the time at 1150 F 15 F is adjusted to giv
38、e a total precipitation heat treatment time of approximately 18 hours. 3.3.3 Oxide Removal Prior to cold working the underhead fillet radius and rolling the threads, surface oxide and oxide penetration caused by prior heat treatment shall be removed from the full body diameter and bearing surface of
39、 the head of the heat treated blanks. The oxide removal process shall produce no intergranular attack or corrosion of the blanks. SAE INTERNATIONAL AS5270 Page 6 of 21 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 r
40、adius complete throughout the circumference of the part shall be cold worked. The fillet shall be cold worked sufficiently to remove all visual evidence of grinding or tool marks. If there is no visual evidence of grinding or tool marks prior to cold working, the fillet shall still be cold worked. D
41、istortion 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 0.002 inch below the contour at “B“ as shown in Figure 2; distorted areas shall not extend beyond
42、 “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, startingat the point of tangency of the fillet radius and the bearing surface of the head. For shouldered bolts, having an unthreaded
43、 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 only for 90 degrees of fillet arc, starting at the point of tangency of the fillet radius and th
44、e shouldered surface of the unthreaded shank. 3.3.5 Thread Rolling Threads shall be formed on the heat treated and finished blanks by a single cold or warm rolling process after removal of oxide as in 3.3.3. 3.3.6 Cleaning Parts, after finishing, shall be degreased and immersed in one of the followi
45、ng 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 of water for 30 to 40 minutes at room temperature. c. One volume of nitric acid (
46、sp gr 1.42) and 4 volumes of water for 10 to 15 minutes at 140 to 160 F. 3.3.6.1 Immediately after removal from the cleaning solution, parts shall be thoroughly rinsed in clean water at 70 to 200 F. 3.4 Product Marking Unless otherwise specified, each part shall be identification marked as specified
47、 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 be plated as specified by the part drawing; plating thickness determined in accord
48、ance with plating specification. 3.6 Mechanical Properties Parts shall conform to the requirements of 3.6.1, 3.6.2, and 3.6.3. Threaded members of gripping fixtures for tensile and fatigue tests shall be of sufficient size and strength to develop the full strength of the part without stripping the t
49、hread. Finished parts shall be tested in accordance with the following applicable test methods: a. Ultimate Tensile Strength at Room Temperature MIL-STD-1312-8 in accordance with NASM1312-8b. Ultimate Tensile Strength at 900 F MIL-STD-1312-18 in accordance with NASM1312-18 c. Fatigue Strength at Room Temperature MIL-STD-1312-11 in accordance with NASM1312-11 SAE INTERNATIONAL AS5270 Page 7 of 21 3.6.1
