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/AMS2300L AEROSPACE MATERIAL SPECIFICATION AMS2300 REV. L Issued 1959-06 Revised 2
5、010-08 Reaffirmed 2015-05 Superseding AMS2300K Steel Cleanliness, Premium Aircraft-Quality Magnetic Particle Inspection Procedure RATIONALE AMS2300L has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE 1.1 This specification covers steel cleanliness requirements in inch/pound
6、 units for premium aircraft-quality ferromagnetic steels, including hardenable, corrosion-resistant steels, by magnetic particle inspection methods. This specification contains sampling, sample preparation, inspection procedures and cleanliness rating criteria (See 8.2). 1.1.1 The metric version, MA
7、M2300, has been cancelled. The SI units have been included in this specification, but the inch/pound units are primary (See 8.8). 1.2 Application This procedure has been used typically for the cleanliness evaluation of blooms, billets, tube rounds, stock for forging or flash welded rings, slabs, bar
8、s, sheet, plate, tubing, and extrusions used in fabricating highly stressed parts where very strict magnetic particle inspection standards are used in final inspection of such parts, but may be used for qualification of a heat, melt or lot of steel. 2. APPLICABLE DOCUMENTS The issue of the following
9、 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 subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding doc
10、ument has been specified, the last published issue of that document shall apply. 2.1 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 604 Macroetch Testing of Consumable Electrode Reme
11、lted Steel Bars and Billets ASTM E 10 Brinell Hardness of Metallic Materials ASTM E 1444 Magnetic Particle Testing 2.2 ANSI Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI B46.1 Surface Texture 3.
12、TECHNICAL REQUIREMENTS 3.1 Melting Practice If the material specification does not require a specific method or methods of consumable electrode remelting and the purchaser has not authorized an alternate method, steel supplied to this specification shall be produced using only the vacuum arc consuma
13、ble electrode process in the remelt cycle, except that steel cast as rectangular ingots for slab and plate may be produced by electroslag remelting. 3.2 Specimen Preparation 3.2.1 Heat Qualification Sampling shall be in accordance with 4.3.1, 4.3.2, or 4.3.3. Samples shall be converted into test spe
14、cimens in accordance with 3.2.3. 3.2.2 Product Qualification Product from a heat not qualified based on sampling as in 4.3.1, 4.3.2, or 4.3.3 shall be sampled in accordance with 4.3.4. Samples shall be converted into test specimens in accordance with 3.2.3. 3.2.3 Working and Rough Machining 3.2.3.1
15、Solid Product 12 Inches (305 mm) and Over in Nominal Diameter or Distance Between Parallel Sides A quarter section shall be cut from each sample sufficiently oversize that the center of the original sample will be approximately on the surface of the specimen after generating to test size. The quarte
16、red section shall then be forged to a 3 to 6 inch (76 to 152 mm) round or square, maintaining the axis of the forging approximately parallel to original direction of rolling. As an alternate method, the full section may be rolled or forged to a 6-inch (152-mm) round or square and an oversize quarter
17、 obtained as in 3.2.3.3. Specimens shall be rough machined to a “one-step” straight cylinder nominally 5 inches (127 mm) long. Minimum stock removal shall be consistent with the machining allowance specified in 3.2.4.1. 3.2.3.2 Solid Product Over 6 to 12 Inches (152 to 305 mm), Exclusive, in Nominal
18、 Diameter or Distance Between Parallel Sides Except Slabs and Plates A quarter section shall be cut from each sample sufficiently oversize that the center of the original sample will be approximately on the surface of the specimen after generating to test size. The quarter section shall be converted
19、 into a test specimen by machining, or forging and machining, to a 3 to 6 inch (76 to 152 mm) round or square. Specimens shall be rough machined to a “one-step” straight cylinder nominally 5 inches (127 mm) long. Minimum stock removal shall be consistent with the machining allowance specified in 3.2
20、.4.1. 3.2.3.3 Solid Product 6 Inches (152 mm) and Under in Nominal Diameter or Distance Between Parallel Sides Except Flat Bars, Slabs, and Plates A quarter section shall be cut from each sample sufficiently oversize that the center of the original sample will be approximately on the surface of the
21、specimen after generating to test size. The quarter section shall be converted into a test specimen by machining to a “one-step” straight cylinder nominally 5 inches (127 mm) long. Minimum stock removal shall be consistent with the machining allowance specified in 3.2.4.1. SAE INTERNATIONAL AMS2300L
22、 Page 2 of 11_ 3.2.3.3.1 As an alternate method, a stepdown specimen may be generated from the full cross-section in equal circumferential steps as in Table 1. TABLE 1A - STEPDOWN SPECIMENS, CYLINDRICAL (INCH/POUND UNITS) Nominal Diameter or Distance Between Parallel Sides Inches Step LengthInches S
23、tep 1 Diameter Step 2 Diameter Step 3 Diameter Step 4 Diameter Step 5 Diameter 0.250 to 0.500, incl 5.000 D - - - - Over 0.500 to 0.750, incl 2.500 D 2/3D - - - Over 0.750 to 1.000, incl 1.665 D 3/4D 1/2D - - Over 1.000 to 1.500, incl 1.250 D 4/5D 3/5D 2/5D - Over 1.500 1.000 D 4/5D 3/5D 2/5D 1/5D D
24、 = Original diameter or distance between parallel sides minus machining stock removed. TABLE 1B - STEPDOWN SPECIMENS, CYLINDRICAL (SI UNITS) Nominal Diameter or Distance Between Parallel Sides Millimeters Step Length Millimeters Step 1 Diameter Step 2 Diameter Step 3 Diameter Step 4 Diameter Step 5
25、Diameter 6.35 to 12.70, incl 127.00 D - - - - Over 12.70 to 19.05, incl 63.50 D 2/3D - - - Over 19.05 to 25.40, incl 42.29 D 3/4D 1/2D - - Over 25.40 to 38.10, incl 31.75 D 4/5D 3/5D 2/5D - Over 38.10 25.40 D 4/5D 3/5D 2/5D 1/5D D = Original diameter or distance between parallel sides minus machinin
26、g stock removed. 3.2.3.4 Flat Bars Specimens, nominally 5 inches (127 mm) long, shall be rough machined to equal-length steps across the width of the specimen in accordance with Table 2, allowing 20% of the thickness or 0.100 inch (2.54 mm), whichever is less, for minimum stock removal. Allowance of
27、 0.010 inch (0.25 mm) shall be made for finish machining. TABLE 2A - STEPDOWN SPECIMENS, FLAT BAR (INCH/POUND UNITS) Nominal Thickness Inches Step Length Inches Step 1 Thickness Step 2 Thickness Step 3 Thickness Step 4 Thickness Step 5 Thickness Up to 0.250, incl 5.000 T - - - - Over 0.250 to 0.500,
28、 incl 2.500 T 2/3T - - - Over 0.500 to 1.000, incl 1.250 T 3/4T 1/2T 1/4T - Over 1.000 1.000 T 4/5T 3/5T 2/5T 1/5T T = Original nominal thickness minus machining stock removed. SAE INTERNATIONAL AMS2300L Page 3 of 11_ TABLE 2B - STEPDOWN SPECIMENS, FLAT BAR (SI UNITS) Nominal Thickness Millimeters S
29、tep Length Millimeters Step 1 Thickness Step 2 Thickness Step 3 Thickness Step 4 Thickness Step 5 Thickness Up to 6.35, incl 127.00 T - - - - Over 6.35 to 12.70, incl 63.50 T 2/3T - - - Over 12.70 to 25.40, incl 31.75 T 3/4T 1/2T 1/4T - Over 25.40 25.40 T 4/5T 3/5T 2/5T 1/5T T = Original nominal thi
30、ckness minus machining stock removed. 3.2.3.5 Slabs or Plates A straight cylindrical or rectangular specimen shall be machined, or forged and machined, from each slab or plate to be tested. The specimen shall be taken essentially parallel to the direction of rolling at the center of the slab or plat
31、e width and thickness and shall be nominally 5 inches (127 mm) in length and not more than 4 inches (102 mm) in final diameter or thickness. 3.2.3.5.1 Product Up to 4 Inches (102 mm), Inclusive, in Nominal Thickness A straight cylindrical specimen shall represent the full thickness consistent with t
32、he machining allowance specified in 3.2.4.1. 3.2.3.5.2 Product Over 4 to 8 Inches (102 to 203 mm), Inclusive, in Nominal Thickness A straight cylindrical specimen shall represent surface to mid-thickness consistent with the machining allowance specified in 3.2.4.1. 3.2.3.5.3 Product Over 8 Inches (2
33、03 mm) in Nominal Thickness A straight cylindrical specimen shall be taken so that the axis is approximately midway between the surface and mid-thickness, and shall have a diameter equal to one-third the nominal thickness of the section. 3.2.3.6 Tubing 3.2.3.6.1 Nominal Wall Thickness 0.250 Inch (6.
34、35 mm) and Over Specimens, nominally 5 inches (127 mm) long, shall be rough machined to four equal circumferential steps, T, 3/4T, 1/2T, and 1/4T, allowing 0.100 inch (2.54 mm) on the diameter for stock removal. Allowance of 0.010 inch (0.25 mm) on the radii for finish machining shall be made. T = n
35、ominal wall thickness minus the machining allowance. 3.2.3.6.2 Nominal Wall Thickness Under 0.250 Inch (6.35 mm) Specimens, nominally 5 inches long (127 mm), after heat treatment as in 3.2.5, shall have 10% of the wall thickness or 0.015 inch (0.38 mm), whichever is less, removed from the outer diam
36、eter and be tested as a straight cylinder. 3.2.4 Machining 3.2.4.1 Product Other Than Flat Bars, Slabs, and Plates Over 8 Inches (203 mm) Thick and Tubing The converted sample shall be machined to conform to the allowance of Table 3 for surface removal, allowing 0.010 inch (0.25 mm) per side for fin
37、ish machining after heat treatment. SAE INTERNATIONAL AMS2300L Page 4 of 11_ TABLE 3 - STOCK REMOVAL Nominal Diameter or Distance Between Parallel Sides Inches (Millimeters) Minimum Stock Removal Inch (Millimeters) per Side 0.250 to 0.500 (6.35 to 12.70), incl 0.030 (0.76) Over 0.500 to 0.750 (12.70
38、 to 19.01), incl 0.045 (1.14) Over 0.750 to 1.000 (19.01 to 25.40), incl 0.060 (1.52) Over 1.000 to 1.500 (25.40 to 38.10), incl 0.075 (1.91) Over 1.500 to 2.000 (38.10 to 50.80), incl 0.090 (2.29) Over 2.000 to 2.500 (50.80 to 63.50), incl 0.125 (3.18) Over 2.500 to 3.500 (63.50 to 88.90), incl 0.1
39、56 (3.96) Over 3.500 to 4.500 (88.90 to 114.30), incl 0.187 (4.75) Over 4.500 to 6.000 (114.30 to 152.40), incl 0.250 (6.35) 3.2.5 Heat Treatment Rough machined specimens shall, if necessary, be heat treated by suitably austenitizing, quenching, and tempering or by solution and precipitation heat tr
40、eating to produce hardness of 248 to 352 HB or appropriate lower hardness for steel of low hardenability. Hardness testing shall be in accordance with ASTM E 10. Specimens shall be austenitized in a neutral or slightly reducing atmosphere. Following heat treatment, surface scale may be removed by gr
41、it blasting or other acceptable method. 3.2.6 Finish Machining The heat treated specimens shall be finished machined to surface roughness not greater than 32 microinches AA, determined in accordance with ANSI B46.1. The ends of the specimen shall be finished to provide good electrical contact. 3.3 I
42、nspection Magnetic particle testing shall be performed in accordance with ASTM E 1444 by the circular, wet, continuous method (See 8.3) using 800 to 1200 amperes per inch (32 to 48 amperes/mm) of diameter or another magnetic particle procedure acceptable to purchaser. If a stepdown bar is used, the
43、smallest step shall be magnetized and inspected first; the larger steps shall be magnetized and inspected individually in succession of increasing size until all steps have been evaluated. If a longitudinal slice from slab or plate, as in 3.2.3.5 is used, only the longitudinal surfaces perpendicular
44、 to the two faces of the slab or plate shall be inspected. 3.3.1 Cleanliness standards presented herein govern nonmetallic inclusions only (See 8.3). Steel that, during inspection, reveals indications representing actual ruptures, such as cracks, seams, laminations, and laps, will be subject to reje
45、ction except where these defects result from sample preparation. If such indications are the consequence of sample preparation, a replacement retest sample may be obtained from material adjacent to the original test location. 3.3.2 The results of the magnetic particle testing shall be appropriately
46、recorded. All recorded results shall be identified, filed, and made available to purchaser upon request. SAE INTERNATIONAL AMS2300L Page 5 of 11_ 3.4 Evaluation of Steel Cleanliness After inspection, each indication 1/64 inch (0.4 mm) and over shall be recorded on an inspection chart. All recorded r
47、esults shall be identified, filed, and, upon request, made available to purchaser. Records shall be available for at least three years after shipment of the product. The frequency rating (F) (number) and the severity rating (S) (length) of the indications shall be calculated as follows: 3.4.1 Freque
48、ncy (F) 3.4.1.1 The number of indications per test specimen is totaled. 3.4.1.2 The frequency rating per specimen is determined by dividing the total number of indications for each specimen by the test surface area of the specimen in square inches (by dividing 6.45 times the total number of indications for ea
