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 2007 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J525 REV. DEC2007 SURFACE VEHICLE STANDARD Issued 1958-04 Revised 2007-12 Superseding J525 MAY1999 Welded and Cold Drawn Low-Carbon Steel Tubing Annealed for Bending and Flaring RATIONALE This five year review of thi
5、s standard resulted in changes identified by the bar on the left side of the page and are described as follows: a. Added SAE and other international standards to the “Related Publications“ section because these documents are related to SAE J525 tubing. b. In Section 8, Performance Requirements, remo
6、ved un-needed SAE J1677 paragraph numbering to eliminate unnecessary confusion. c. In Section 8, Performance Requirements, added elongation test. 1. SCOPE This SAE Standard covers normalized electric-resistance welded, cold-drawn, single-wall, low-carbon steel pressure tubing intended for use as pre
7、ssure lines and in other applications requiring tubing of a quality suitable for bending, flaring, forming, and brazing. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest versi
8、on of SAE publications shall apply. 2.1.1 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. SAE J409 Product AnalysisPermissible Variations from Specified Chemica
9、l Analysis of a Heat or Cast of Steel SAE J1677 Tests and Procedures for Steel and Copper Nickel Tubing 2.2 Related Publications The following publications are provided for information purposes only and are not a required part of this document. Copyright SAE International Provided by IHS under licen
10、se with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J525 Revised DEC2007 - 2 - 2.2.1 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
11、USA), www.sae.org. SAE J514 Hydraulic Tube Fittings SAE J533 Flares for Tubing SAE J1065 Nominal Reference Working Pressures for Steel Hydraulic Tubing SAE J1453 FittingO-Ring Face Seal SAE J2551 Recommended Practices for Fluid Conductor Metallic Tubing Applications SAE J2592 Carbon Steel Tubing for
12、 General UseUnderstanding Nondestructive Testing for Carbon Steel Tubing SAE J2658 Metallic Tube Conductor Assemblies for Fluid Power and General UseTest Methods for Hydraulic Fluid Power Metallic Tube Assemblies 2.2.2 ISO Publications Available from ANSI, 25 West 43rd Street, New York, NY 10036-800
13、2, Tel: 212-642-4900, www.ansi.org. ISO 3305 Plain end welded precision steel tubesTechnical conditions for delivery ISO 5598 Fluid power systems and componentsVocabulary ISO 8434-2 Metallic tube connections for fluid power and general usePart: 2 37 flare fittings ISO 8434-3 Metallic tube connection
14、s for fluid power and general usePart: 3 ORFS fittings ISO 10583 Hydraulic fluid powerTest methods for tube connections ISO 10763 Hydraulic fluid powerPlain-end, seamless and welded steel tubesDimensions and nominal working pressures 2.2.3 ASTM Publications Available from ASTM, 100 Barr Harbor Drive
15、, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 513 Electric-Resistance-Welded Carbon and Alloy Steel Tubing ASTM A 450/A 450M Standard Specifications for General Requirements for Carbon, Ferritic Alloy and Austenitic Alloy Steel Tubing Copyright SAE International Provide
16、d by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J525 Revised DEC2007 - 3 - 3. MANUFACTURE The tubing shall be made from flat-rolled steel shaped into a tubular form, the edges of which are joined and fused together by electric-res
17、istance welding. After forming and welding, the tubing shall be normalized and subjected to a cold-drawing operation that shall result in a 15% minimum reduction in cross-sectional area, of which 8% shall consist in a reduction in wall thickness. Subsequent to cold working, the tubing shall be norma
18、lized via an atmospherically controlled method to produce a finished product that will meet all requirements of this document. 4. DIMENSIONS AND TOLERANCES The tolerances applicable to the tubing outside diameter and inside diameter are shown in Table 1. The tolerances applicable to tubing wall thic
19、kness are shown in Table 2. Dimensional tolerances can only apply to two of the three tubing dimensions (OD, ID, or wall). Unless otherwise agreed upon between the purchaser and tube producer, dimensional tolerances shall apply to the tube OD and wall dimension. TABLE 1 - TUBING OUTSIDE DIAMETER TOL
20、ERANCE Nominal Tubing OD(1)(2)mm Tube Tolerance OD mm Tube Tolerance ID mm Up to 9.50 0.05 0.05 Over 9.50 to 15.88 inclusive 0.06 0.06 Over 15.88 to 50.80 inclusive 0.08 0.08 Over 50.80 to 63.50 inclusive 0.10 0.10 Over 63.50 to 76.20 inclusive 0.13 0.13 Over 76.20 to 100.00 inclusive 0.15 0.15 1. O
21、D measurements shall be taken at least 50 mm from the end of the tubing. 2. Refer to SAE J514 for nominal tubing OD to be used in conjunction with standard hydraulic tube fittings and SAE J533 for recommended maximum nominal wall thickness for double flaring. Copyright SAE International Provided by
22、IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J525 Revised DEC2007 - 4 - TABLE 2 - TUBING WALL THICKNESS TOLERANCES Nominal Wall Thickness(1)Nominal Tubing Outside DiameterThrough 22 mm mm Nominal Tubing Outside Diameter Over 22 mm T
23、hrough 48 mm mm Nominal Tubing Outside Diameter Over 48 mm Through 100 mm mm 0.89 0.05/0.05 0.05/0.05 0.05/0.05 1.00 0.05/0.05 0.05/0.08 0.05/0.08 1.25 0.05/0.05 0.05/0.08 0/05/0.08 1.50 0.05/0.05 0.05/0/08 0.05/0.08 1.65 0.05/0.05 0.05/0/08 0.05/0.08 2.00 0.05/0.05 0.05/0.08 0.08/0.08 2.11 0.05/0.0
24、5 0.05/0.08 0.08/0.08 2.41 0.05/0.05 0.05/0.08 0.08/0.08 2.50 0.05/0.08 0.05/0.10 0.08/0.08 2.77 0.05/0.08 0.05/0.10 0.08/0.08 3.00 0.08/0.08 0.05/0.10 0.08/0.08 3.05 0.08/0.08 0.05/0.10 0.08/0.08 3.40 0.05/0.10 0.08/0.08 3.75 0.05/0.10 0.08/0.08 4.00 0.08/0.10 0.08/0.10 4.19 0.08/0.10 0.08/0.10 4.5
25、7 0.10/0.10 0.08/0.13 5.00 0.10/0.13 0.10/0.13 5.16 0.10/0.13 0.10/0.13 5.59 0.10/0.15 0.10/0.15 6.00 0.13/0.15 0.13/0.15 6.05 0.13/0.15 0.13/0.15 6.58 0.13/0.15 0.13/0.15 1. For intermediate wall thickness, the tolerance for the next heavier wall thickness shall apply. 5. MANUFACTURING STANDARDS 5.
26、1 Straightness Tubing shall be straightened to a tolerance of 0.8 mm in 1000 mm. Straightness tolerances shall be measured by placing a 1000 mm straight edge against the tube while lying on its neutral axis. The point of maximum deflection of the tube from the straight edge should not be more than a
27、llowed by the specification when measured with a feeler gauge. 5.2 Tubing End Condition The tubing will be produced using normal mill cut-off practices. This will include, but is not limited to double-cut ends, saw-cut, and rotary-cut ends. Care will be taken to minimize the distortion of the tube e
28、nds. Distortion of the tube ends must not affect the normal re-cutting processes that will be performed by the end user. Ends that require further processing will be by agreement between the producer and tube purchaser. Copyright SAE International Provided by IHS under license with SAENot for Resale
29、No reproduction or networking permitted without license from IHS-,-,-SAE J525 Revised DEC2007 - 5 - 5.3 Surface Finish The outside and inside surface finish of the tube are critical in order to prevent possible leak paths on flared fittings, mechanical form fittings, or other applications where the
30、surface of the tube becomes the sealing surface. The surface of the tube shall be free of excessive roll marks, score marks, chatter marks, or other surface imperfections that would be considered detrimental to the function of the tubing. 5.4 Thermal Treatment The tubing is to be heated to a tempera
31、ture above the upper transformation point via an atmospherically controlled method, and then cooled in a protective atmosphere. 6. MATERIAL Tubing shall be made from low-carbon flat-rolled steel conforming to the chemical composition in Table 3. The steel shall be made by the open-hearth, basic oxyg
32、en, or electric furnace process. A ladle analysis of each heat shall be made to determine the percentages of the elements specified. The chemical composition thus determined shall be reported to the purchaser or his representative, if requested, and shall conform to the requirements specified. If a
33、check analysis is required, the tolerances shall be as specified in SAE J409, Table 3. TABLE 3 - CHEMICAL REQUIREMENTS Element Cast or Heat Analysis, Weight % Carbon 0.06 min/0.18 max Manganese 0.30 through 0.60 Phosphorus 0.04 max Sulfur 0.05 max 7. MECHANICAL PROPERTIES The finished tubing shall h
34、ave mechanical properties as tabulated in Table 4: TABLE 4 - MECHANICAL PROPERTIES Properties Values Yield Strength, min 170 MPa Ultimate Strength, min 310 MPa Elongation in 50 mm, min 35%(1)Hardness (Rockwell B), max 65(2)1. For tubing having nominal outside diameter of 9.5 mm or less, and/or wall
35、thickness of 0.9 mm or less, a minimum elongation of 25% is permissible. 2. The hardness test shall not be required on tubing with a nominal wall thickness of less than 1.65 mm. Such tubing shall meet all other mechanical properties and performance requirements. 8. PERFORMANCE REQUIREMENTS The finis
36、hed tubing shall satisfactorily meet the following performance tests. All tests are to be conducted in accordance with the procedures in SAE J1677. 8.1 Flattening Test 8.2 Flaring Test Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permi
37、tted without license from IHS-,-,-SAE J525 Revised DEC2007 - 6 - 8.3 Reverse Flattening Test 8.4 Expansion Test 8.5 Hardness Test 8.6 Tensile Test 8.7 Elongation Test 8.8 Pressure Proof Test Performed when agreed upon between the purchaser and the producer (where allowable unit stress of material(s)
38、 = 140 MPa (80% of minimum yield strength). 8.9 Nondestructive Electronic Test This test is to be conducted after all cold-working tube manufacturing operations are performed on the tubing. 9. TEST CERTIFICATES A certificate of compliance to the performance requirements shall be furnished to the pur
39、chaser by the producer, if requested in the purchase agreement. The tube producer must be able to certify that each heat lot used to produce the tubing complies with the performance requirement. 10. CLEANLINESS The inside and outside surfaces of the finished tubing shall be commercially bright, clea
40、n, and free from grease, oxide scale, carbon deposits, and any other contamination that cannot be readily removed by cleaning agents normally used in manufacturing plants. 11. CORROSION PROTECTION The inside and outside of the finished tubing shall be protected against corrosion during shipment and
41、normal storage. If a corrosion preventive compound is applied, it shall be such that after normal storage periods, it can readily be removed by cleaning agents normally used in manufacturing. 12. PACKAGING The tubing is to be packaged in such a way to allow it to be transported and stored, with norm
42、al care, without being damaged. Any special packaging will be by agreement between the producer and purchaser. 13. NOTES 13.1 Marginal Indicia The (R) is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. If the symbol is n
43、ext to the report title, it indicates a complete revision of the report. PREPARED BY THE SAE FLUID CONDUCTORS AND CONNECTORS TECHNICAL COMMITTEE SC5 METALLIC TUBING Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
