1、Designation:A75910(Reapproved 2016)Standard Specification forCarbon Steel Crane Rails1This standard is issued under the fixed designation A759;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pare
2、ntheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers carbon steel crane rails ofspecial designs
3、 only,and nominal weights of 104 lb/yd(51.6kg/m)through 175 lb/yd(86.8 kg/m)for crane runway use.1.2 When standard tee rail sections are desired,they shall beordered in accordance with Specification A1.1.3 Supplementary Requirements S1 through S3 of anoptional nature are provided.They shall apply on
4、ly whenspecified by the purchaser in the order.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standard
5、s:2A1 Specification for Carbon Steel Tee RailsA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for Shipment3.Ordering Information3.1 Orders for crane rails under this specification shallinclude the following information as appropriate:3.1.1 Quantity(tons or pieces),3.1.2 ASTM d
6、esignation and year of issue,3.1.3 Complete identification of section with dimensionaldrawing if required(see Section 2),3.1.4 Length of rails or length of runway as required,(see6.3),3.1.5 Arrangement of drilled bolt holes with dimensionaldrawing if required,3.1.6 Supplementary requirements that sh
7、all apply(see S1through S3),and3.1.7 Certification and Test Report Requirements(see Sec-tion 10).4.Manufacture4.1 Melting PracticeThe steel shall be made by any of thefollowing processes:basic-oxygen or electric-furnace.4.1.1 The steel may be cast by a continuous process,or iningots.4.2 DiscardA suf
8、ficient discard shall be made to securefreedom from injurious segregation and piping.4.3 Control Cooling:4.3.1 Rails shall be control cooled in accordance with thefollowing procedure,except when produced from vacuum-degassed steel or control cooled blooms,in which case the railsmay be air cooled and
9、 4.3.2 4.3.6 are not applicable.4.3.2 All rails shall be cooled on hot beds or runways untilfull transformation is accomplished,and then charge immedi-ately into the containers.In no case should the rail be chargedbelow 725F(386C).4.3.3 The temperature of the rails before charging shall bedetermined
10、 with reliable equipment at the head of the rail atleast 12 in.(305 mm)from the end.4.3.4 The cover shall be placed on the container immedi-ately after completion of the charge and shall remain in placefor at least 10 h.After the removal or raising of the lid of thecontainer,no rails shall be remove
11、d until the temperature of thetop layer of rails has fallen to 300F(149C)or lower.4.3.5 The temperature between an outside rail and theadjacent rail in the bottom tier of the container at a point notless than 12 in.(305 mm),nor more than 36 in.(914 mm),fromthe rail end shall be recorded.This tempera
12、ture shall be thecontrol for judging rate of cooling.4.3.6 The container shall be so protected and insulated thatthe control temperature shall not drop below 300F(149C)in7 h from the time that the bottom tier is placed in the container.If this cooling requirement is not met,the rails shall beconside
13、red control cooled provided the temperature at alocation not less than 12 in.(305 mm)from the end of a rail atapproximately the center of the middle tier does not drop below300F(149C)in less than 15 h.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Re
14、lated Alloys and is the direct responsibility of SubcommitteeA01.01 on Steel Rails and Accessories.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1978.Last previous edition approved in 2010 as A759 10.DOI:10.1520/A0759-10R16.2For referenced ASTM standards,visit the ASTM
15、 website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4
16、.4 High Strength RailsWhen specified in accordancewith Supplementary Requirement S1,all or a portion of thequantity of rails ordered shall be high strength.4.5 ChamferingWhen specified in accordance withSupplementary Requirement S2,the ends of rails shall bechamfered.4.6 Ends Prepared for Electric Arc WeldingWhen rails areto be joined by electric arc welding,special end preparationmay be available from individual manufacturers as may bedeveloped in accordance with Supplementary Requirement S3.5.
