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 theref
2、rom, 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 InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/J525_201609SURFACE VEHICLESTANDARDJ525 SEP2016Issued 1958-04Revised 2016-09Superseding J525 M
5、AY1999Welded and Cold Drawn Low-Carbon Steel Tubing Annealed for Bending and FlaringRATIONALEThis five year review of the SAE J525 standard incorporates revisions requested by producers, fabricators and users of this material type. The updates include the following:1. Added recommendation for the us
6、e of metric size materials.2. Edited list of applicable publications.3. Edited list of related publications.4. Revised straightness note to comply with latest verbiage.5. Revised tube end condition note to comply with latest verbiage.6. Revised surface finish note to comply with latest verbiage.7. U
7、pdated corrosion protection note to comply with latest verbiage.8. Update packaging note to comply with latest verbiage.9. Revised Sulfur and Phos. requirements in table 3 to harmonize with J403 document.10. Revised section 6 “check analysis” to “product analysis.”11. Revised wording of test certifi
8、cate requirement in section 9.1. SCOPEThis SAE Standard covers normalized electric-resistance welded, cold-drawn, single-wall, low-carbon steel pressure tubing intended for use as pressure lines and in other applications requiring tubing of a quality suitable for bending, flaring, forming, and brazi
9、ng.SAE INTERNATIONAL J525 SEP2016 Page 2 of 8In an effort to standardize within a global marketplace and ensuring that companies can remain competitive in an international market it is the intent to convert to metric tube sizes which will:x Lead to one global systemx Guide users to preferred systemx
10、 Reduce complexityx Eliminate inventory duplications2. REFERENCES2.1 Applicable DocumentsThe following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest version of SAE publications shall apply.2.1.1 SAE PublicationsAvailable from SA
11、E 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.SAE J403 Chemical Compositions of SAE Carbon SteelsSAE J409 Product Analysis - Permissible Variations from Specified Chemical Analysis of a Heat
12、 or Cast of SteelSAE J1677 Tests and Procedures for Steel and Copper Nickel Tubing2.2 Related PublicationsThe following publications are provided for information purposes only and are not a required part of this SAE Technical Report.2.2.1 SAE PublicationsAvailable from SAE International, 400 Commonw
13、ealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.SAE J514 Hydraulic Tube FittingsSAE J533 Flares for TubingSAE J1065 Nominal Reference Working Pressures for Steel Hydraulic TubingSAE J1453-1 Specification for O-Ring Face
14、Seal Connectors: Part 1 Tube Connection Details and Common Requirements for Performance and TestsSAE J1453-2 Specification for O-Ring Face Seal Connectors: Part 2 Requirements, Dimensions, and Tests For Steel Unions, Bulkheads, Swivels, Braze Sleeves, Braze-on Tube Ends, Caps, and Connectors with IS
15、O 6149-2Metric Stud Ends and ISO 6162 4-Bolt Flange HeadsSAE J1453-3 Specification for O-Ring Face Seal Connectors: Part 3 Requirements, Dimensions, and Tests for Steel Unions, Bulkheads, Swivels, Braze Sleeves, Caps, and Connectors with SAE J1926-2 Inch Stud EndsSAE INTERNATIONAL J525 SEP2016 Page
16、3 of 8SAE J2551-1 Recommended Practices for Fluid Conductor Carbon, Alloy and High Strength Low Alloy Steel Tubing Applications-Part 1: Design and FabricationSAE J2551-2 Recommended Practices for Fluid Conductor Carbon, Alloy and High Strength Low Alloy Steel Tubing Applications-Part 2: General Spec
17、ifications and Performance RequirementsSAE J2551-3 Recommended Practice for Fluid Conductor Carbon, Alloy and High Strength Low Alloy Steel Tubing Applications-Part 3: ProcurementSAE J2592 Carbon Steel Tubing for General Use - Understanding Nondestructive Testing for Carbon Steel Tubing2.2.2 ISO and
18、 EN PublicationsCopies of these documents are available online at http:/webstore.ansi.org/ISO 3305 Plain end welded precision steel tubes - Technical conditions for deliveryISO 5598 Fluid power systems and components - VocabularyISO 8434-2 Metallic tube connections for fluid power and general use -
19、Part: 2 37 flare fittingsISO 8434-3 Metallic tube connections for fluid power and general use - Part: 3 ORFS fittingsISO 10583 Hydraulic fluid power - Test methods for tube connectionsISO 10763 Hydraulic fluid power - Plain-end, seamless and welded steel tubes - Dimensions and nominal working pressu
20、resISO 19879 Metallic tube connections for fluid power and general use - Test methods for hydraulic fluid power connectionsEN 10305-2 Steel Tubes for Precision Applications-Technical Delivery Conditions, Part 2; Welded Cold Drawn Tubes rev 10 dated 2/28/2010EN 10305-6 Steel Tubes for Precision Appli
21、cations-Technical Delivery Conditions, Part 6; Welded Cold Drawn Tubes for hydraulic and Pneumatic Systems; rev 5 dated 8/31/072.2.3 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.orgASTM A 513 E
22、lectric-Resistance-Welded Carbon and Alloy Steel TubingASTM A 450/A 450M Standard Specifications for General Requirements for Carbon, Ferritic Alloy and Austenitic Alloy Steel TubingASTM E213-09 Standard Practice for Ultrasonic Testing of Metal Pipe and Steel TubeASTM E309-11 Standard Practice for E
23、ddy Current Examination of Steel Tubular Products using Magnetic SaturationASTM E570-09 Standard Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular ProductsSAE INTERNATIONAL J525 SEP2016 Page 4 of 83. MANUFACTUREThe tubing shall be made from flat-rolled steel shaped into a tubular
24、form, the edges of which are joined and fused together by electric-resistance welding. After forming and welding, the tubing shall be normalized and subjected to a cold-drawing operation that shall result in a wall thickness reduction of 8% minimum. Subsequent to cold working, the tubing shall be no
25、rmalized via an atmospherically controlled method to produce a finished product that will meet all requirements of this document.4. DIMENSIONS AND TOLERANCESThe tolerances applicable to the tubing outside diameter and inside diameter are shown in Table 1. The tolerances applicable to tubing wall thi
26、ckness 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
27、eranceNominal TubingOD(1)(2)mmTubeToleranceODr mmTubeToleranceIDr mmUp to 9.50 0.05 0.05Over 9.50 to 15.88 inclusive 0.06 0.06Over 15.88 to 50.80 inclusive 0.08 0.08Over 50.80 to 63.50 inclusive 0.10 0.10Over 63.50 to 76.20 inclusive 0.13 0.13Over 76.20 to 100.00 inclusive 0.15 0.151. OD measurement
28、s shall be taken at least 50 mm from the end of the bulk 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.SAE INTERNATIONAL J525 SEP2016 Page 5 of 8Table 2
29、- Tubing wall thickness tolerancesNominalWallThickness(1)Nominal TubingOutside DiameterThrough 22 mm mmNominal TubingOutside DiameterOver 22 mmThrough 48 mm mmNominal TubingOutside DiameterOver 48 mmThrough 100 mm mm0.89 0.05/0.05 0.05/0.05 0.05/0.051.00 0.05/0.05 0.05/0.08 0.05/0.081.25 0.05/0.05 0
30、.05/0.08 0/05/0.081.50 0.05/0.05 0.05/0/08 0.05/0.081.65 0.05/0.05 0.05/0/08 0.05/0.082.00 0.05/0.05 0.05/0.08 0.08/0.082.11 0.05/0.05 0.05/0.08 0.08/0.082.41 0.05/0.05 0.05/0.08 0.08/0.082.50 0.05/0.08 0.05/0.10 0.08/0.082.77 0.05/0.08 0.05/0.10 0.08/0.083.00 0.08/0.08 0.05/0.10 0.08/0.083.05 0.08/
31、0.08 0.05/0.10 0.08/0.083.40 0.05/0.10 0.08/0.083.75 0.05/0.10 0.08/0.084.00 0.08/0.10 0.08/0.104.19 0.08/0.10 0.08/0.104.57 0.10/0.10 0.08/0.135.00 0.10/0.13 0.10/0.135.16 0.10/0.13 0.10/0.135.59 0.10/0.15 0.10/0.156.00 0.13/0.15 0.13/0.156.05 0.13/0.15 0.13/0.156.58 0.13/0.15 0.13/0.151. For inter
32、mediate wall thickness, the tolerance for the next heavier wall thickness shall apply.5. MANUFACTURING STANDARDS5.1 StraightnessTubing shall be straightened to a tolerance of 1 mm over a 1000 mm length 5.2 Tubing End ConditionThe tubing shall be produced using normal mill cut-off practices, e.g. pun
33、ch-cut ends, double cut ends or rotary-cut ends. Tube end distortion must be minimized; end condition shall not affect normal re-cut processes performed by the end user. Extraordinary end cut processing requirements shall be defined by agreement between the producer and purchaser.SAE INTERNATIONAL J
34、525 SEP2016 Page 6 of 85.3 Surface ConditionThe outside and inside surface condition of the tube are critical in order to prevent possible leak paths on flared fittings,mechanical form fittings, or other applications where the surface of the tube becomes the sealing surface. The surface of the tube
35、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 TreatmentThe tubing is to be heated to a temperature above the upper transformation point using an atmospherically controll
36、ed method, and then cooled in a protective atmosphere below critical transformation temperature and allowed to air cool to room temperature.6. MATERIALTubing shall be made from low-carbon flat-rolled steel conforming to the chemical composition in Table 3. The steel shall be made by the basic oxygen
37、, 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 pr
38、oduct analysis is required, the tolerances shall be as specified in SAE J409, Table 3.Table 3 - Chemical requirementsElementCast or Heat Analysis,Weight %Carbon 0.06 min/0.18 maxManganese 0.30 through 0.60Phosphorus 0.030 maxSulfur 0.035 max7. MECHANICAL PROPERTIESThe finished tubing shall have mech
39、anical properties as tabulated in Table 4:Table 4 - Mechanical propertiesProperties ValuesYield Strength, min 170 MPaUltimate Strength, min 310 MPaElongation 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 thickness of
40、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.SAE INTERNATIONAL J525 SEP2016 Page 7 of 88. PERFORM
41、ANCE REQUIREMENTSThe finished 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 Test8.2 Flaring Test8.3 Reverse Flattening Test8.4 Expansion Test8.5 Hardness Test8.6 Tensile Test8.7 Elongation
42、 Test8.8 Pressure Proof TestNOTE: Pressure Proof Test performed when agreed upon between the purchaser and the producer (where allowable unit stress of material(s) = 140 MPa (80% of min yield strength).8.9 Nondestructive Electronic TestNOTE: Nondestructive Electronic Test is to be conducted after al
43、l cold-working tube manufacturing operations are performed on the tubing.9. TEST CERTIFICATESA certificate of compliance to the performance requirements shall be furnished to the purchaser by the producer, if requested in the purchase agreement. The tube producer shall be able to certify that each h
44、eat lot and unique production run of tubingcomplies with the performance requirement.10. CLEANLINESSThe inside and outside surfaces of the finished tubing shall be commercially bright, clean, and free from grease, oxide scale,carbon deposits, and any other contamination that cannot be readily remove
45、d by cleaning agents normally used in manufacturing plants.11. CORROSION PROTECTIONThe inside and outside of the finished tubing shall be protected against corrosion during shipment and normal storage. If a corrosion preventive compound is applied, it shall be such that after normal storage periods,
46、 it can readily be removed by cleaning agents normally used in manufacturing.A specific corrosion resistant coating may be specified by the purchaser.12. PACKAGINGThe tubing shall be packaged in such a way to allow it to be transported and stored, with normal care, without being damaged. Any special
47、 packaging requirements shall be by agreement between the producer and purchaser.SAE INTERNATIONAL J525 SEP2016 Page 8 of 813. NOTES13.1 Revision IndicatorA change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes
48、, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.PREPARED BY THE SAE FLUID CONDUCTORS AND CONNECTORS TECHNICAL STEERING COMMITTEE C5METALLIC TUBING COMMITTEE
