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/AMS5558H AEROSPACE MATERIAL SPECIFICATION AMS5558 REV. H Issued 1958-01 Reaffirme
5、d 2008-05 Revised 2016-05Superseding AMS5558G Steel, Corrosion and Heat-Resistant, Welded Tubing 18Cr - 10.5Ni - 0.70Cb (Nb) (347) Thin Wall Solution Heat Treated (Composition similar to UNS S34700) RATIONALE AMS5558H revises Fabrication (3.3) and Reports (4.4), and is a Five Year Review and update
6、of this specification. 1. SCOPE 1.1 Form This specification covers a corrosion and heat-resistant steel in the form of welded tubing. 1.2 Application This tubing has been used typically for high-pressure air ducting requiring both corrosion and heat resistance, especially when such ducting is welded
7、 during fabrication, and when the wall thickness is approximately 2% or less of the OD, but usage is not limited to such applications. 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 h
8、erein. 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 document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available fro
9、m SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly Alloyed Steels, and Iron
10、Alloys AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought Products and Forging Stock SAE INTERNATIONAL AMS5558H Page 2 of 8 AMS2634 Ultrasonic Inspection, Thin Wall Metal Tubing AMS2807 Identification, Carbon and Low-Alloy Steels, Corrosion and He
11、at-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS4194 Sheet and Strip Surface Finish Nomenclature 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Consh
12、ohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A262 Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels ASTM A370 Mechanical Testing of Steel Products ASTM A480/A480M Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip ASTM E353 Chemical
13、Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys ASTM E1742/E1742M Radiographic Examination 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
14、E353, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element Min Max Carbon - 0.08 Manganese - 2.00 Silicon 0.30 1.00 Phosphorus - 0.040 Sulfur - 0.030 Chromium 17.00 19.00 Nickel 9.00 12.00 Columbium (Niobium) 10xC 1.10 Molybdenum - 0.75 Co
15、pper - 0.75 SAE INTERNATIONAL AMS5558H Page 3 of 8 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2248. 3.2 Condition Solution heat treated, and, unless solution heat treatment is performed in an atmosphere yielding a bright finish, pickled as required or pa
16、ssivated. Tubing shall have been cold worked sufficiently to meet the dimensional requirements of 3.5.4 and 3.6.3. 3.3 Fabrication Tubing shall be machine fusion welded, shall contain no more than one longitudinal weld, and shall contain no circumferential welds. Tube ends shall be cut square and de
17、burred. Tubing, except for the weld reinforcement, shall have a surface appearance in accordance with ASTM A480/A480M and AS4194 comparable to a No. 2B sheet finish. 3.4 Properties Tubing shall conform to the following requirements; tensile and bend testing shall be performed in accordance with ASTM
18、 A370: 3.4.1 Tensile Properties Shall be as shown in Table 2. Table 2A - Tensile properties, inch/pound units Tensile Strength ksi Minimum Yield Strength at 0.2% Offset ksi Minimum Elongation in 2 Inches, % Strip Specimen (4.3.1) Minimum Elongation in 2 Inches, % Full SectIon 75 to 105 35.0 35 40 Ta
19、ble 2B - Tensile properties, SI units Tensile Strength MPa Minimum Yield Strength at 0.2% Offset MPa Minimum Elongation in 50.8 mm, % Strip Specimen (4.3.1) Minimum Elongation in 50.8 mm, % Full SectIon 517 to 724 241 35 40 3.4.2 Bending A specimen as in 4.3.2 shall withstand, without showing cracks
20、 or other imperfections when examined using 8 to 12X magnification, bending at room temperature flat on itself with axis of bend perpendicular to axis of weld and with inside of tube on either inside or outside of bend. 3.4.3 Weld Crack Susceptibility A specimen as in 4.3.3 shall withstand, without
21、evidence of cracks occurring on, or adjacent to, the weld bead when examined using 8 to 12X magnification, being pulled parallel to the direction of the weld bead until rupture occurs. 3.4.4 Susceptibility to Intergranular Attack Specimens of tubing taken to include the weld, after sensitization tre
22、atment, shall pass the intergranular corrosion test performed in accordance with ASTM A262, Practice E. SAE INTERNATIONAL AMS5558H Page 4 of 8 3.4.5 Weld Strength Shall be as follows, determined in accordance with 3.4.5.1 or 3.4.5.2. 3.4.5.1 Hydrostatic Pressure Test A specimen as in 4.3.4 shall wit
23、hstand, without rupture, an internal hydrostatic pressure which will produce a hoop tensile stress of 75.0 ksi (517 MPa) in the tubing wall for not less than 60 seconds. Hydrostatic pressure (P) shall be calculated using Equation 1 and shall be applied gradually in 30 to 60 seconds at a temperature
24、not lower than 60 F (16 C). (Eq. 1)where, P = Test pressure in ksi (MPa) S = 75.0 ksi (517 MPa) tensile stress D = Nominal OD in inches (mm) (nominal OD plus tolerance) d = Nominal ID in inches (mm) (nominal OD minus twice the minimum wall thickness). 3.4.5.2 Tensile Strength Shall be not lower than
25、 75 ksi (517 MPa), determined on specimens as in 4.3.5. 3.5 Quality 3.5.1 Tubing, as received by purchaser, shall be uniform in contour, quality, and condition and shall have a finish conforming to the best practice for high quality aircraft tubing. It shall be sound and free from grease, oil, and o
26、ther foreign matter. It shall be free from burrs, cracks, tears, grooves, seams, laminations, dents, crimps, and other imperfections detrimental to usage of the tubing. 3.5.2 The weld in each length of tubing, prior to cold working, shall be subjected to radiographic inspection in accordance with AS
27、TM E1742/E1742M. Imperfections in or adjacent to the weld, porosity, pinholes, entrapped slag, cracks, mismatches, lack of fusion, undercutting, or other imperfections which cause sharp notches or a reduction of thickness greater than 10% of parent metal wall thickness are not acceptable. 3.5.2.1 Me
28、tal thinning in, or adjacent to, the weld shall be permissible if not greater than 10% of parent metal wall thickness, provided also that it presents only gradual transitions. 3.5.2.2 Individual lengths of tubing which contain no weld imperfections other than metal thinning in excess of 10% of paren
29、t metal wall thickness may be reinspected radiographically after cold working. If cold working has reduced the metal thinning to less than 10%, the thinning indicated by the first radiograph will not be cause for rejection. 3.5.2.3 Each length of tubing in a shipment shall be accompanied by its radi
30、ographs. 3.5.3 As an alternate to use of radiographic inspection, tubing shall be subjected to ultrasonic inspection in accordance with AMS2634, Class Level A1, except that the length of the notch in the reflector specified in Table 1A is to be 0.250 inches. 3.5.4 Mechanical imperfections, such as l
31、ight handling marks and light tool marks, are acceptable provided they have not dented the wall of the tube and are gradual in contour to a maximum depth of 10% of parent metal wall thickness. 3.5.5 The weld reinforcement shall not extend in height beyond the contour of the adjacent metal more than
32、0.0025 inch (0.064 mm) on either outside or inside of the tubing, and the sum of both outside and inside weld reinforcement heights shall not exceed 0.004 inch (0.10 mm). SAE INTERNATIONAL AMS5558H Page 5 of 8 3.6 Tolerances Unless otherwise specified, the following tolerances shall apply: 3.6.1 Dia
33、meter Shall be as shown in Table 3. Table 3A - Diameter tolerances, inch/pound units Nominal OD Inches Tolerance, Inch Minus Only 1.000 to 2.500, incl. 0.005 Over 2.500 to 3.500, incl. 0.007 Over 3.500 to 4.500, incl. 0.009 Over 4.500 to 7.000, incl. 0.012 Table 3B - Diameter tolerances, SI units No
34、minal OD Millimeters Tolerance, Millimeter Minus Only 25.40 to 63.50, incl. 0.13 Over 63.50 to 88.90, incl. 0.18 Over 88.90 to 114.30, incl. 0.23 Over 114.30 to 177.80, incl. 0.30 3.6.1.1 Outside diameter shall be measured using a periphery or Pi tape. 3.6.2 Wall Thickness Shall be as shown in Table
35、 4. Table 4A - Wall thickness tolerances, inch/pound units Nominal Wall Thickness Inches Tolerance, Inch Plus and Minus 0.010 to 0.016, incl. 0.002 Over 0.016 to 0.026, incl. 0.003 Over 0.026 to 0.040, incl. 0.004 Over 0.040 to 0.058, incl. 0.005 Over 0.058 to 0.072, incl. 0.006 Table 4B - Wall thic
36、kness tolerances, SI units Nominal Wall Thickness Millimeters Tolerance,Millimeter Plus and Minus 0.25 to 0.41, incl. 0.05 Over 0.41 to 0.66, incl. 0.08 Over 0.66 to 1.02, incl. 0.10 Over 1.02 to 1.47, incl. 0.13 Over 1.47 to 1.83, incl. 0.15 SAE INTERNATIONAL AMS5558H Page 6 of 8 3.6.3 Ovality For
37、tubing having nominal wall thickness of 0.040 inch (1.02 mm) and under, ovality shall not exceed 6% of the nominal OD. For tubing having nominal wall thickness over 0.040 inch (1.02 mm), the tolerances shown in Table 5 shall apply. Table 5 - Maximum ovality Nominal OD Inches Nominal OD Millimeters T
38、olerance % of OD 1.000 to 1.250, incl. 25.40 to 31.75, incl. 5.0 Over 1.250 to 1.500, incl. Over 31.75 to 38.10, incl. 4.0 Over 1.500 to 1.750, incl. Over 38.10 to 44.45, incl. 3.5 Over 1.750 to 2.000, incl. Over 44.45 to 50.80, incl. 3.0 Over 2.000 to 2.500, incl. Over 50.80 to 63.50, incl. 2.5 Ove
39、r 2.500 to 7.000, incl. Over 63.50 to 177.80, incl. 2.0 3.6.3.1 Ovality is obtained by dividing the difference between the maximum and minimum OD of any one station along the tube by the nominal OD and multiplying by 100. 3.6.4 Length Cut-to-length tubing shall not vary from the length ordered by mo
40、re than +1/8 inch (+3.2 mm), -0. 3.6.5 Straightness When measured using a 3 foot (914 mm) straight-edge touching the tube at two points, the perpendicular distance from the straight-edge to the tube at any point between the two points of contact, shall not exceed 0.030 x L/3 inch, where “L” is the d
41、istance in feet between points of contact or shall not exceed 0.83 x L mm, where “L” is the distance in meters between points of contact. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of tubing shall supply all samples for producers tests and shall be responsible for
42、 the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the tubing conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.4.1), bend
43、ing (3.4.2), weld crack susceptibility (3.4.3), weld strength (3.4.5), radiographic (3.5.2) or ultrasonic (3.5.3) inspection, and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Susceptibility to intergranular attack (3.4.4) is a p
44、eriodic test and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. SAE INTERNATIONAL AMS5558H Page 7 of 8 4.3 Sampling and Testing Shall be in accordance with AMS2371 and the following: 4.3.1 Strip specimens for tensile testing (3.4.1)
45、shall be taken parallel to the tubing axis, shall have a 2 inch (50.8 mm) gage length, and shall not include the weld reinforcement. 4.3.2 Specimens for bending (3.4.2) shall be at least 2 inches (50.8 mm) long when measured parallel to the weld direction. Additionally, the sample shall contain the
46、full width of the weld plus 0.10 inches (2.5 mm) minimum on either side of the weld toe. 4.3.3 Specimens for weld crack susceptibility (3.4.3) shall be cut from a tube in such a manner as to include at least 6 inches (152 mm) of weld bead and 1/4 inch (6.4 mm) of tube wall on each side of the weld.
47、The edges shall be smooth and free from burrs. 4.3.4 Specimens for weld strength hydrostatic pressure test (3.4.5.1) shall be full cross-section of the tubing, the unsupported length of which shall be not less than 2 feet (610 mm) or six times the nominal OD, whichever is greater. 4.3.5 Specimens fo
48、r weld strength tensile test (3.4.5.2) shall be taken perpendicular to the direction of the weld and shall include the weld near the center of the gage length. 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
49、 melted (e.g., final melt in the case of metal processed by multiple melting operations) and the following results of tests and relevant information: 4.4.1 For each heat: Composition. 4.4.2 For each lot: Tensile properties Bending property Weld crack susceptibility Weld strength Radiographic (or ultrasonic) inspection. 4.4.3 A statement that the product conforms to the other technical requirements. 4.4.4 Purchase order number
