ASTM A254 A254M-2012 Standard Specification for Copper-Brazed Steel Tubing《铜焊钢管标准规格》.pdf
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1、Designation: A254 97 (Reapproved 2007) A254/A254M 12Standard Specification forCopper-Brazed Steel Tubing1This standard is issued under the fixed designation A254;A254/A254M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year
2、of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers double-w
3、all, copper-brazed steel tubing suitable for general engineering uses, particularly in theautomotive, refrigeration, and stove industries for fuel lines, brake lines, oil lines, heating and cooling units, and the like. Thetubing is available in either of two types, single strip or double strip as sh
4、own in Fig. 1.1.2 UnitsThis specification is expressed in both inch-pounds units and in SI units; however, unless the purchase order orcontract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in eitherinch-pound units or SI units a
5、re to be regarded separately as the standard. standard. Within the text, the SI units are shown inbrackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently ofthe other. Combining values from the two systems may result in non-conforman
6、ce with the standard. In this specification hard orrationalized conversions apply to diameters, lengths, and tensile properties. Soft conversion applies to other SI measurements.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA751
7、Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsE30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron (Withdrawn 1995)3E59 Practice for Sampling Steel and Iron for Determination of Chemical Composition (Withdrawn 1996)32.2 Soci
8、ety of Automotive Engineers Standard:4J 533 Flares for Tubing3. Ordering Information3.1 Orders for material under this specification should include the following, as required to describe the desired materialadequately:3.1.1 Quantity (feet, metres), metres or number of pieces),3.1.2 Name of material
9、(copper-brazed steel tubing),3.1.3 Type, single strip or double strip, where necessary (see Fig. 1) (normally the type is not specified),3.1.4 Size (outside diameter and wall thickness; normally inside diameter should not be specified),3.1.5 Length (specific or random),3.1.6 Inside surface cleanline
10、ss where required (see Section 8),3.1.7 External coating, where required (see Section 7 and Supplementary Requirement S2), and3.1.8 Special or supplementary requirements or exceptions to specification.4. Manufacture4.1 The steel may be made by any commercially accepted steelmaking process.4.2 If a s
11、pecific type of melting is required by the purchaser, it shall be as stated on the purchase order.1 This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.09on Carbon Steel Tubular Products.
12、Current edition approved Nov. 1, 2007Nov. 1, 2012. Published January 2008December 2012. Originally approved in 1944. Last previous edition approved in 20022007as A254 97(2002).(2007). DOI: 10.1520/A0254-97R07.10.1520/A0254_A0254M-12.2 For referenced ASTM standards, visit the ASTM website, www.astm.o
13、rg, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from American Society of Me
14、chanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org. SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.This document is not an ASTM standard and is intended only to provide the user of an A
15、STM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as publishe
16、d by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.3 The primary melting may incorporate separate degassing or refining and may be followed by secondary melting, such aselectroslag re
17、melting or vacuum-arc remelting. If secondary melting is employed, the heat shall be defined as all of the ingotsremelted from a single primary heat.4.4 Steel may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identificationof the resultant trans
18、ition material is required. The producer shall remove the transition material by an established procedure thatpositively separates the grades.4.5 The tubing shall be made by rolling steel strip into the form of tubing and subsequently copper brazing in a reducingatmosphere.4.6 Tubing shall be constr
19、ucted as shown in Fig. 1.4.7 Tubing shall be suitably tested after brazing by the manufacturer to ensure freedom from leaks and detrimental flaws.5. Chemical Composition5.1 The steel shall conform to the requirements as to chemical composition prescribed in Table 1.5.2 Heat AnalysisAn analysis of ea
20、ch heat of steel shall be made by the steel manufacturer to determine the percentages ofthe elements specified. If secondary melting processes are employed, the heat analysis shall be obtained from one remelted ingotor the product of one remelted ingot of each primary melt. The chemical composition
21、thus determined, or that determined froma product analysis made by the tubular product manufacturer shall conform to the requirements specified.5.3 Product AnalysisTubing of this quality is commonlymay be produced in rimmed or capped steel which is characterizedby a lack of uniformity in its chemica
22、l composition. For this reason, rejection for product analysis is not appropriate unlessmisapplication is clearly indicated.5.4 Methods of AnalysisMethods described in Test Methods E30 shall be used for referee purposes. Due allowance shall bemade for the presence of copper brazing metal.5.5 Samples
23、 for Product AnalysisExcept for spectro-graphic analysis, samples shall be taken in accordance with Practice E59.6. Mechanical Requirements6.1 Tension TestTensile properties of tubing as manufactured (prior to cold working) shall conform to the requirementsspecified in Table 2.6.1.1 The specimens an
24、d tension tests required shall be made in accordance with Test Methods and Definitions A370.6.1.2 Specimens shall be tested at room temperature.6.1.3 Test specimens shall be taken from the ends of finished tubes prior to upsetting, swaging, expanding, or other formingoperations, or being cut to leng
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