1、Designation:A51218Standard Specification forCold-Drawn Buttweld Carbon Steel Mechanical Tubing1This standard is issued under the fixed designation A512;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numbe
2、r in parentheses 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.Scope*1.1 This specification covers cold-drawn buttweld carbonsteel
3、tubes for use as mechanical tubing.1.2 This specification covers round,square,rectangular,andspecial shape mechanical tubing.1.3 Round tube size ranges covered are outside diameters upto 312in.(88.9 mm)and wall thickness from 0.035 to 0.500 in.(0.89 to 12.70 mm).1.4 Optional supplementary requiremen
4、ts are provided and,when desired,shall be so stated in the order.1.5 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.1.6 This product is a
5、vailable in various grades(Section 6Tables 1 and 2 and conditions(Section 5).1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and
6、Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsA104
7、0 Guide for Specifying Harmonized Standard GradeCompositions for Wrought Carbon,Low-Alloy,and AlloySteels2.2 Military Standards:3MIL-STD-129 Marking for Shipment and Storage2.3 Federal Standard:Fed.Std.No.123 Marking for Shipments(Civil Agencies)33.Ordering Information3.1 Orders for material under t
8、his specification shouldinclude the following,as required,to describe the requiredmaterial adequately:3.1.1 Quantity(feet,weight(Note 1),or number of lengths),NOTE1The term“weight”is temporarily used in this specificationbecause of established trade usage.The word is used to mean both“force”and“mass
9、,”and care must be taken to determine which is meant in eachcase(SI unit for force=newton and for mass=kilogram).3.1.2 Name of material(buttweld carbon steel mechanicaltubing),3.1.3 Form(round,square,rectangular,special shape),3.1.4 Condition,description and code letters(Section 5),3.1.5 Grade,if re
10、quired(Section 6),3.1.6 Dimensions(round,Section 9 or square andrectangular,Section 10),3.1.7 Length(round length,9.2;square and rectangularlength,10.5),3.1.8 Burr removal(Section 11),3.1.9 Report of chemical analysis and products analysis,ifrequired,3.1.10 Individual supplementary requirements if r
11、equired(S1 through S5),3.1.11 Special requirements,3.1.12 End use,3.1.13 Specification designation,3.1.14 Special marking(Section 15),and3.1.15 Special packaging(Section 16).4.Materials and Manufacture4.1 The steel shall be made by any process.1This specification is under the jurisdiction of ASTM Co
12、mmittee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 1964.Last previous edition approved in 2017 as A512 17.DOI:10.1520/A0512
13、-18.2For referenced ASTM standards,visit the ASTM 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.3Available from Standardization Documents Order Desk,Bldg.4 Se
14、ction D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with inte
15、rnationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.2 If a specific type of melting is required by
16、the purchaser,it shall be as stated on the purchase order.4.3 The primary melting may incorporate separate degas-sing or refining,and may be followed by secondary melting,such as electroslag or vacuum-arc remelting.If secondarymelting is employed,the heat shall be defined as all of theingots remelted from a single primary heat.4.4 Steel may be cast in ingots or may be strand cast.Whensteel of different grades is sequentially strand cast,identifica-tion of the resultant transition material is req
