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 2012 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: +1 724-776-4970 (outside U
4、SA) 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/AMS6411H AEROSPACE MATERIAL SPECIFICATION AMS6411 REV. H Issued 1969-03 Revised 2012-12 Super
5、seding AMS6411G Steel Bars, Forgings, and Tubing 0.88Cr 1.8Ni 0.42Mo 0.08V (0.28 0.33C) (4330 Mod) Consumable Electrode Remelted (Composition similar to UNS K23080) RATIONALE AMS6411H results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a prem
6、ium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock. 1.2 Application These products have been used typically for parts requiring high tensile strength and good ductility with relatively high impact strength, superior transverse properties, and ha
7、rdness, but usage is not limited to these applications. Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment. ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DOCUMENTS The issue of the follow
8、ing documents in effect on the date of the purchase order forms a part of this document to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding docum
9、ent has been specified, the last published issue of that document shall apply. SAE AMS6411H Page 2 of 9 2.1 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 USA), www.sae.org. AMS2
10、251 Tolerances, Low-Alloy Steel Bars AMS2253 Tolerances, Carbon and Alloy Steel Tubing AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2300 Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure AMS2310 Qualification Sampling of Steels, Tran
11、sverse Tensile Properties AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon an
12、d Alloy Steels and Heat and Corrosion-Resistant Steels and Alloys AMS2808 Identification, Forgings AS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corro
13、sion-Resistant Steels and Alloys 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 A 255 End-Quench Test for Hardenability of Steel ASTM A 370 Mechanical Testing of Steel Products AST
14、M A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E 112 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E 384 Knoop and Vickers Hardness of Materials 3. TECH
15、NICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. SAE AMS6411H Page 3 of 9 TABLE 1 - COMPOSITION Element
16、 min max Carbon 0.28 0.33 Manganese 0.65 1.00 Silicon 0.15 0.35 Phosphorus - 0.015 Sulfur - 0.015 Chromium 0.75 1.00 Nickel 1.65 2.00 Molybdenum 0.35 0.50 Vanadium 0.05 0.10 Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Pract
17、ice Steel shall be multiple melted using either electroslag remelting (ESR) practice or consumable electrode vacuum arc remelting (VAR) practice as the final melting process. 3.3 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in
18、accordance with ASTM A 370: 3.3.1 Bars Bars shall not be cut from plate. (Also see 4.4.2.) 3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished having tensile strength not higher than 130 ksi (896 MPa), or equivalent hardness (See 8.
19、2). 3.3.1.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished, and annealed if necessary, unless otherwise ordered, having hardness not higher than 241 HB, or equivalent (See 8.3). Bars ordered cold finished may have hardness as high as 248 HB,
20、 or equivalent (See 8.3). 3.3.2 Forgings Normalized and tempered having hardness not higher than 269 HB, or equivalent (See 8.3). 3.3.3 Mechanical Tubing Cold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent (See 8.3). Tubing ordered hot finished and annealed
21、 shall have hardness not higher than 99 HRB, or equivalent (See 8.3). 3.3.4 Forging Stock As ordered by the forging manufacturer. SAE AMS6411H Page 4 of 9 3.4 Properties The product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A
22、 370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, tube rounds (solid, not hollow), and forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfecti
23、ons shall be no worse than macrographs of ASTM A 604 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Class Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B 3.4.1.1 If tubes are produced directly from ingots or large blooms, transverse sections may be taken fr
24、om the tubes rather than tube rounds. Macroetch standards for such tubes shall be as agreed upon by purchaser and vendor. 3.4.2 Average Grain Size of Bars, Forgings and Tubing Shall be ASTM No. 5 or finer, determined in accordance with ASTM E 112. 3.4.3 Hardenability of Each Heat Shall be J 14/16 in
25、ch (22 mm) = 49 HRC minimum, and J 24/16 inch (38 mm) = 45 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255 except that the steel shall be normalized at 1700 F 10 (927 C 6) and the specimen austenitized at 1550 F 10 (843 C 6). 3.4.4 Decarburization 3.4.4
26、.1 Bars and tubing ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. Decarburization on tubing ID shall not exceed the maximum depth specified in 3.4.4.4. 3.4.4.2 Allowable decarburization of bars, billets, and tube rounds or tubing o
27、rdered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor. 3.4.4.3 Decarburization of bars when 3.4.4.1 or 3.4.4.2 is not applicable shall be not greater than shown in Table 3. TABLE 3A - MAXIMUM DEPTH OF DECARBURIZATION, BARS, INCH/
28、POUND UNITS Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl 0.015 Over 0.375 to 0.500, incl 0.017 Over 0.500 to 0.625, incl 0.019 Over 0.625 to 1.000, incl 0.022 Over 1.000 to 1.500, incl 0.025 Over 1.500 to 2.000, incl 0.030 Over 2.00
29、0 to 2.500, incl 0.035 Over 2.500 to 3.000, incl 0.040 Over 3.000 to 4.000, incl 0.045 SAE AMS6411H Page 5 of 9 TABLE 3B - MAXIMUM DEPTH OF DECARBURIZATION, BARS, SI UNITS Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 9.52, incl 0.38
30、 Over 9.52 to 12.70, incl 0.43 Over 12.70 to 15.88, incl 0.48 Over 15.88 to 25.40, incl 0.56 Over 25.40 to 38.10, incl 0.64 Over 38.10 to 50.80, incl 0.76 Over 50.80 to 63.50, incl 0.89 Over 63.50 to 76.20, incl 1.02 Over 76.20 to 101.60, incl 1.14 3.4.4.3.1 Limits for depth of decarburization of ba
31、rs over 4.000 inches (101.60 mm) in nominal diameter or distance between parallel sides shall be as agreed upon by purchaser and vendor. 3.4.4.4 Decarburization of tubing when 3.4.4.1 or 3.4.4.2 is not applicable shall be not greater than shown in Table 4. TABLE 4A - MAXIMUM DEPTH OF DECARBURIZATION
32、, TUBING, INCH/POUND UNITS Nominal Wall Thickness Inches Total Depth of Decarburization Inch ID Total Depth of Decarburization Inch OD Up to 0.109, incl 0.008 0.015 Over 0.109 to 0.203, incl 0.010 0.020 Over 0.203 to 0.400, incl 0.012 0.025 Over 0.400 to 0.600, incl 0.015 0.030 Over 0.600 to 1.000,
33、incl 0.017 0.035 Over 1.000 0.020 0.040 TABLE 4B - MAXIMUM DEPTH OF DECARBURIZATION, TUBING, SI UNITS Nominal Wall Thickness Millimeters Total Depth of Decarburization Millimeter ID Total Depth of Decarburization Millimeters OD Up to 2.77, incl 0.20 0.38 Over 2.77 to 5.16, incl 0.25 0.51 Over 5.16 t
34、o 10.16, incl 0.30 0.64 Over 10.16 to 15.24, incl 0.38 0.76 Over 15.24 to 25.40, incl 0.43 0.89 Over 25.40 0.51 1.02 3.4.4.5 Decarburization shall be measured by the metallographic method, by HR30N scale hardness testing method, or by a traverse method using microhardness testing in accordance with
35、ASTM E 384. The hardness method(s) shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by a hardness method, is defined as the perpendicular distance from the surface to the dep
36、th under that surface below which there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute, the depth of decarburization determined using the microhardness trav
37、erse method shall govern. 3.4.4.5.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less. SAE AMS6411H Page
38、 6 of 9 3.4.5 Response to Heat Treatment Extracted specimens shall meet the following requirements after being normalized by heating to 1700 F 10 (927 C 6), holding at heat for not less than 1 hour, and cooling in air; hardened by heating to 1550 F 10 (843 C 6), holding at heat for 1 hour 0.2, and q
39、uenching in oil, and heated to the required tempering temperature, held at heat for not less than 1 hour, and cooled in air. 3.4.5.1 Longitudinal Tensile Properties Shall be as shown in Table 5; testing in the longitudinal direction need not be performed on product tested in the transverse direction
40、. TABLE 5 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 220.0 ksi (1517 MPa) Yield Strength at 0.2% Offset 185.0 ksi (1276 MPa) Elongation in 4D 10% Reduction of Area 35% 3.4.5.2 Transverse Tensile Properties Shall be as shown in Table 6, determined on specimens selected and prepared
41、in accordance with AMS2310. Transverse tensile requirements of Table 6 apply only to product that tensile specimens not less than 2.50 inches (63.5 mm) in length can be taken. TABLE 6A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Cross-Sectional Area Square Inches Tensile Strength ksi Yield Streng
42、th at 0.2% Offset ksi Reduction of Area %, Average Reduction of Area %, Individual Up to 144, incl 220.0 185.0 35 30 Over 144 to 225, incl 220.0 185.0 30 25 Over 225 220.0 185.0 25 20 TABLE 6B - MINIMUM TENSILE PROPERTIES, SI UNITS Cross-Sectional Area Square Centimeters Tensile Strength MPa Yield S
43、trength at 0.2% Offset MPa Reduction of Area %, Average Reduction of Area %, Individual Up to 929, incl 1517 1276 35 30 Over 929 to 1452, incl 1517 1276 30 25 Over 1452 1517 1276 25 20 3.5 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from
44、foreign materials and from imperfections detrimental to usage of the product. 3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300 except that a maximum average frequency (F) rating of 0.10 and a maximum average severity (S) rating of 0.20 shall apply. 3.5.2 Bars and tubing ordered ho
45、t rolled or cold drawn, or ground, turned, or polished shall, after removal of the stock removal allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the machined, ground, turned, or polished surface. SAE AMS6411H Page 7 of 9 3.5.3 Grain flow of die forgings, exce
46、pt in areas that contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.6 Tolerances 3.6.1 Bars In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility fo
47、r Inspection The vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requi
48、rements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.3), macrostructure (3.4.1), average grain size (3.4.2), hardenability (3.4.3), decarburization (3.4.4), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.
49、2 Periodic Tests Response to heat treatment (3.4.5), frequency-severity cleanliness rating (3.5.1) and grain flow of die forgings (3.5.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing 4.3.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In ac
