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 2016 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/AMS5955B AEROSPACE MATERIAL SPECIFICATION AMS5955 REV. B Issued 2013-01 Revised 2
5、016-06Superseding AMS5955A Steel, Corrosion-Resistant, Bars, Wire, and Forgings 10Cr - 12Ni - 2Mo - 1.45Al - 1.15Ti Vacuum Induction Plus Vacuum Consumable Electrode Melted Solution Heat Treated, Precipitation Hardenable (Composition similar to UNS S11902) RATIONALE AMS5955B results from a Limited S
6、cope Ballot to revise Tensile Properties (Table 4). 1. SCOPE 1.1 Form This specification covers a corrosion-resistant steel in the form of bars, wire, forgings, and forging stock. 1.2 Application These products have been used typically for heat-treated parts requiring stress corrosion resistance, al
7、ong with a combination of high strength and high toughness up to 800 F (427 C) with good ductility and strength in the transverse direction, but usage is not limited to such applications. 1.2.1 Certain design, processing procedures, or environmental conditions may cause these products to become susc
8、eptible to stress-corrosion cracking; ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subse
9、quent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth D
10、rive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire AMS2248 Chemical Check Analysis Limits Corrosion and Heat-Resistant
11、 Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron Alloys SAE INTERNATIONAL AMS5955B Page 2 of 9 AMS2300 Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS2371 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloy
12、s Wrought Products and Forging Stock AMS2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steel and Alloy Forgings AMS2750 Pyrometry AMS2806 Identification Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloy
13、s AMS2808 Identification Forgings ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1182 Standard Stock Removal Allowance Aircraft-Quality and Premium Aircraft-Qua
14、lity Steel Bars and Mechanical Tubing 2.2 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 A370 Mechanical Testing of Steel Products ASTM A604 Macroetch Testing of Consumable Electrode R
15、emelted Steel Bars and Billets ASTM E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness ASTM E353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, a
16、nd Other Similar Chromium-Nickel-Iron Alloys ASTM E399 Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E353, by s
17、pectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon - 0.02 Manganese - 0.25 Silicon - 0.25 Phosphorus - 0.015 Sulfur - 0.010 Chromium 9.50 10.50 Nickel 11.50 13.00 Molybdenum 1.75 2.25 Titanium 0.95 1.50 Aluminum 1.30 1.70 Nitr
18、ogen - 0.01 SAE INTERNATIONAL AMS5955B Page 3 of 9 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2248. 3.2 Melting Practice Product shall be multiple melted using vacuum induction melting followed by vacuum consumable electrode remelt practice. 3.3 Conditio
19、n The product shall be supplied in the following condition: 3.3.1 Bars, Wire, and Forgings Bar shall not be cut from plate (see 4.4.7). 3.3.1.1 Rounds Solution heat treated and turned, centerless ground, and polished. 3.3.1.2 Hexagons Solution heat treated and descaled. 3.3.1.3 Squares and Flats Hot
20、 finished, solution heat treated, and machined or descaled. 3.3.1.4 Wire Cold finished, solution treated and unless heat treated in an atmosphere producing a bright finish, descaled. 3.3.1.5 Forgings Solution heat treated and descaled. 3.3.2 Forging Stock As ordered by the forging manufacturer. 3.4
21、Heat Treatment Bars, wire, and forgings shall be solution heat treated by heating to 1560 F 25 F (850 C 14 C), holding at heat for 90 minutes 15 minutes, and quenching in oil or water, cooling to -100 F (-73 C) or colder, holding at that temperature for not less than sixteen hours, and warming in ai
22、r to room temperature. Pyrometry shall be in accordance with AMS2750. SAE INTERNATIONAL AMS5955B Page 4 of 9 3.5 Properties The product shall conform to the following requirements; tensile and hardness testing shall be performed in accordance with ASTM A370. 3.5.1 All Products 3.5.1.1 Macrostructure
23、 Visual examination of transverse full cross-sections from bars, billets, and forging stock, etched in hot hydrochloric acid in accordance with ASTM A604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A604 show
24、n in Table 2. Table 2 - Macrostructure limits Class Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation A 4 Ring Pattern B 3.5.2 Bars, Wire, and Forgings 3.5.2.1 As Solution Heat Treated 3.5.2.1.1 Tensile Strength Wire shall have tensile strength not higher than 160 ksi (1103 MPa).
25、3.5.2.1.2 Hardness 3.5.2.1.2.1 Bars Not higher than 331 HB, or equivalent (see 8.2), determined at mid-radius or quarter thickness. 3.5.2.1.2.2 Forgings Not higher than 331 HB, or equivalent (see 8.2). 3.5.2.2 After Precipitation Heat Treatment The solution heat treated product, 10 inches (254 mm) a
26、nd under in nominal diameter or maximum cross-sectional dimension, precipitation heat treated to the temperature and time shown in Table 3 and cooled in air, oil, or other suitable liquid quench (see 8.3), shall have the properties specified in 3.5.2.2.1, 3.5.2.2.2, and 3.5.2.2.3. Table 3 - Precipit
27、ation heat treating parameters Condition Temperature Time H950 950 F 10 F (510 C 6 C) 16 hours 0.3 hour SAE INTERNATIONAL AMS5955B Page 5 of 9 3.5.2.2.1 Tensile Properties Shall be as shown in Table 4. Table 4A - Minimum tensile properties, inch/pound units Condition Specimen Orientation Tensile Str
28、ength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Reduction of Area % H950 Longitudinal Transverse 268 268 249 249 9 7 40 35 Table 4B - Minimum tensile properties, SI units 3.5.2.2.1.1 Longitudinal tensile property requirements apply to specimens taken in the longitudinal di
29、rection from bars and wire and to specimens taken from forgings with axis of specimen in the area of gage length varying not more than 15 degrees from parallel to the forging flow lines. 3.5.2.2.1.2 Transverse tensile property requirements apply to specimens taken approximately perpendicular to the
30、longitudinal direction of bars and to specimens taken from forgings with axis of specimens in the area of gage length varying not more than 15 degrees from perpendicular to the forging flow lines. 3.5.2.2.1.3 Transverse tensile property requirements apply only to products from which a test specimen
31、not less than 2.5 inches (63.5 mm) long can be taken. If the cross-sectional dimensions of the product permit, the transverse testing shall be of the short-transverse (ST) direction; otherwise, the orientation shall be long transverse (LT). 3.5.2.2.1.4 Products tested in the transverse direction nee
32、d not be tested in the longitudinal direction. 3.5.2.2.2 Hardness Shall not be lower than shown in Table 5, or equivalent (see 8.2). Product shall not be rejected on the basis of hardness if the tensile property requirements of Table 4 are acceptable, determined on specimens taken from the same samp
33、le as that with nonconforming hardness or from another sample with similar nonconforming hardness. Table 5 - Minimum hardness Condition Hardness, HB HRC H950 51.5 3.5.2.2.3 Fracture Toughness Shall not be lower than shown in Table 6, determined in accordance with ASTM E399 on specimens in the longit
34、udinal LT or LR orientation from product 3.00 inches (76.2 mm) and over in nominal section thickness. If product size precludes use of specimens which will provide valid KIc results, use of KQ values for acceptance is permissible. Table 6 - Minimum fracture toughness, KIC Condition Fracture Toughnes
35、s ksi Fracture Toughness MPa H950 41 45 inch mCondition Specimen Orientation Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Reduction of Area % H950 Longitudinal Transverse 1850 1850 1715 1715 9 7 40 35 SAE INTERNATIONAL AMS5955B Page 6 of 9 3.5.3 Forging Stock
36、When a sample of stock is forged to a test coupon and heat treated as in 3.4 and 3.5.2.2, specimens taken from the heat treated coupon shall conform to the requirements of 3.5.2.2.1, 3.5.2.2.2, and 3.5.2.2.3. If specimens taken from the stock after heat treatment as in 3.4 and 3.5.2.2 conform to the
37、 requirements of 3.5.2.2.1, 3.5.2.2.2 and 3.5.2.2.3, the tests shall be accepted as equivalent to tests of a forged coupon. 3.6 Quality 3.6.1 Steel shall be premium aircraft quality conforming to AMS2300. 3.6.2 The product, as received by purchaser, shall be uniform in quality and condition, sound,
38、and free from foreign materials and from imperfections detrimental to usage of the product. 3.6.3 Bars and wire ordered hot rolled or cold drawn, or ground, turned, or polished shall, after removal of the standard stock removal allowance in accordance with AS1182, be free from seams, laps, tears, an
39、d cracks open to the ground, turned, or polished surface. 3.6.4 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.7 Tolerances Bars and wire shall conform to all applicable r
40、equirements of AMS2241. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmator
41、y testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests The following requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.1.1 Composition (3.1) and macrostructure rating (
42、3.5.1.1) of each heat. 4.2.1.2 Tensile properties (3.5.2.1.1) of wire as solution heat treated. 4.2.1.3 Hardness (3.5.2.1.2) of bars and forgings, as solution heat treated. 4.2.1.4 Tensile properties (3.5.2.2.1) and hardness (3.5.2.2.2) of bars, wire, and forgings after precipitation heat treatment
43、at 950 F (510 C). 4.2.1.5 Tolerances (3.7) of bars and wire. 4.2.1.6 Ability of forging stock (3.5.3) to develop required properties. SAE INTERNATIONAL AMS5955B Page 7 of 9 4.2.2 Periodic Tests The following requirements are periodic tests and shall be performed at a frequency selected by the produc
44、er unless frequency of testing is specified by purchaser. 4.2.2.1 Fracture toughness (3.5.2.2.3) of bars and forgings after heat treatment. 4.2.2.2 Frequency-severity cleanliness rating (3.6.1). 4.2.2.3 Grain flow of die forgings (3.6.4). 4.3 Sampling and Testing 4.3.1 Bars, Wire, and Forging Stock
45、In accordance with AMS2371. 4.3.2 Forgings In accordance with AMS2374. 4.4 Reports The producer of the product shall furnish with each shipment a report showing the producers name and country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations)
46、and the following results of tests and relevant information: 4.4.1 For each heat. Composition (3.1) and macrostructure (3.5.1.1). 4.4.2 For each lot of wire, bars, and forgings. If wire, tensile strength as solution heat treated (3.5.2.1.1) If bar or forgings, hardness solution heat treated (3.5.2.1
47、.2) Tensile properties (3.5.2.2.1) and hardness (3.5.2.2.2) after precipitation heat treatment to the H950 hardened condition. 4.4.3 A statement that the product conforms to the other technical requirements. 4.4.4 Purchase Order Number Heat and lot numbers AMS5955B Size Quantity. 4.4.5 If forgings a
48、re supplied, the size and melt source of stock used to make the forgings. 4.4.6 The producer of stock for forgings shall furnish with each shipment a report showing the producers name and country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operatio
49、ns) and the results of test for the composition of each heat and of the ability of the forging stock to develop the required properties (3.5.3). This report shall include the purchase order number, heat and lot number, AMS5955B, size and quantity. 4.4.7 If the ship size/shape is cut from a larger cross section, report the nominal metallurgically worked size (see 3.3.1). SAE INTERNATIONAL AMS5955B Page
