ASTM A2-2002 Standard Specification for Carbon Steel Girder Rails of Plain Grooved and Guard Types《平型、带槽和防护型碳素钢平底轨道的标准规范》.pdf
《ASTM A2-2002 Standard Specification for Carbon Steel Girder Rails of Plain Grooved and Guard Types《平型、带槽和防护型碳素钢平底轨道的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A2-2002 Standard Specification for Carbon Steel Girder Rails of Plain Grooved and Guard Types《平型、带槽和防护型碳素钢平底轨道的标准规范》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 2 02Standard Specification forCarbon Steel Girder Rails of Plain, Grooved, and Guard Types1This standard is issued under the fixed designation A 2; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last rev
2、ision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) 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. Scope*1.1 This specification covers carbon steel gird
3、er rails2ofthree classes based on type or type and weight, and chemistrydefined as follows and in Table 1:1.1.1 Unless otherwise specified by the purchaser, girder-guard rails shall be Class A.1.1.2 Plain and grooved-girder rails under 135 lb/yd (67.1kg/m) in weight shall be specified by the purchas
4、er as eitherClass A or Class B.1.1.3 Plain and grooved-girder rails of 135 lb/yd in weightand heavier shall be Class C, unless otherwise specified.1.2 The values states in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Referenced Docume
5、nts2.1 ASTM Standards:A 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic Shipments3E 10 Test Method for Brinell hardness of Metallic Materi-als43. Classification of Rails3.1 No. 1 RailsRails that are free of injurious imperfec-tions and flaws of all kinds.3.2
6、No. 2 RailsRails that contain surface imperfections insuch number or of such character that shall not, in the judgmentof the inspector, render them unfit for recognized uses.4. Ordering Information4.1 Orders for girder rails under this specification shallinclude the following information as appropri
7、ate:4.1.1 ASTM designation and date of issue,4.1.2 Quantity (tons or pieces as appropriate),4.1.3 Complete identification of section with dimensionaldrawing if required,4.1.4 Arrangement of bolt holes, bond holes, and tie rodholes with dimensional drawings, if required,4.1.5 Class (in accordance wit
8、h 1.1 and Table 1), and4.1.6 Certification and Test Report (see 12.1).5. Manufacture5.1 Melting PracticeThe steel shall be made by any of thefollowing processes: open-hearth, basic-oxygen, or electric-furnace.5.1.1 The steel may be cast by a continuous process, or iningots.5.2 DiscardSufficient disc
9、ard shall be made to securefreedom from injurious segregation and piping.6. Chemical Composition6.1 Heat or Cast AnalysisAn analysis for each heat orcast of steel shall be made by the manufacturer to determine thepercentage of the elements specified in Table 1. The analysisshall be made from a test
10、sample representing the heat or castand shall conform to the requirements in Table 1.6.2 Upon request by the purchaser, similar samples shall beprovided to verify the heat or cast analysis as determined in6.1.6.3 Product AnalysisWhen ladle tests are not available,finished material representing the h
11、eat may be product tested.The product analysis allowance beyond the limits of thespecified ladle analysis shall be within the limits for productanalyses specified in Table 2.7. Hardness Properties7.1 Test Specimens:7.1.1 Three representative sections of rail from each heatshall be selected as test s
12、pecimens.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the direct responsibility of SubcommitteeA01.01 on Steel Rails and Accessories.Current edition approved November 10, 2002. Published December 2002.Originally approved in 1
13、912. Last previous edition approved in 1990 as A 31 90(1997).2Design details for carbon steel girder rails are indicated in the girder railcatalogs of individual manufacturers.3Annual Book of ASTM Standards, Vol 01.05.4Annual Book of ASTM Standards, Vol 03.01.TABLE 1 Chemical Requirements, %Class A
14、Class B Class CCarbon 0.600.75 0.700.85 0.750.90Manganese 0.600.90 0.600.90 0.600.90Phosphorus, max 0.04 0.04 0.04Silicon 0.100.40 0.100.40 0.100.401*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
15、PA 19428-2959, United States.7.1.2 Excess scale and decarburization shall be removedfrom the test area of the head or web of the selected specimens.7.2 Procedure:7.2.1 1 The test shall be conducted in accordance with TestMethod E 10.7.3 Requirements:7.3.1 Class A rail shall have a Brinell hardness o
16、f 248 to293, and Classes B and C shall have hardnesses of 269 to 321.7.4 RetestsIf the average depth of the impressions ob-tained on the head of the three specimens from any heat failsto conform to the requirements specified in 7.3, the manufac-turer may at his option retest the specimens, or each r
17、ail fromthat heat. Rails represented by retests which conform to therequirements of 7.3 shall be accepted.8. Permissible Variations of Dimension, Weight, andOther Physical Attributes8.1 Section:8.1.1 The section of the rail shall conform to the designspecified by the purchaser.8.1.2 A variation of16
18、4 in. (0.4 mm) less or132 in. (0.8 mm)greater than the specified height will be permitted.8.1.3 A variation of18 in. (3.2 mm) from the specifiedoverall width of the head and tram will be permitted, but anyvariation that would affect the gage line more than132 in. (0.8mm) will not be permitted.8.1.4
19、The overall width of the base shall not vary under thatspecified more than18 in. (3.2 mm) for widths less than 612 in.(165 mm),316 in. (4.8 mm) for a width of 612 in., and14 in.(6.35 mm) for a width of 7 in. (178 mm).8.1.5 No variation will be permitted in dimensions affectingthe fit of the joint ba
20、rs, except that the fishing templateapproved by the purchaser may stand out laterally not morethan332 in. (2.4 mm).8.1.6 The base of the rail shall be at right angles to the web,and the convexity shall not exceed132 in. (0.8 mm).8.1.7 When necessary, because of the type of track construc-tion, and n
21、otice to that effect has been given to the manufac-turer, the position of the gage line with respect to the outer edgeof the base shall not vary more than364 in. (1.2 mm).8.2 WeightThe weight of the rails per yard as calculated,shall be maintained as nearly as possible after conforming tothe require
22、ments specified in 8.1.8.3 Length:8.3.1 Unless otherwise specified, the standard length of railshall be 39 ft (11.9 m) where measured at a temperature of60F (15C).8.3.2 All standard 39-ft lengths may be specified; or8.3.3 Standard 39-ft lengths with up to 11 % of the entireorder in lengths shorter t
23、han standard, varying by 1 ft (0.3 m)from 38 to 24 ft (11.6 to 7.3 m) may be specified; or8.3.4 Length variations other than those described in 8.3.3may be established by agreement between the purchaser andmanufacturer.8.3.5 A variation of716 in. (11 mm) from the specifiedlength of individual rails
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