ASTM-A618

Designation:A618/A618M-04 (Reapproved 2015)NTERNATIONALStandard Specification forHot-Formed Welded and Seamless High-Strength Low-AlloyStructural TubingThis standard is issued under the fixed designation A618/A618M:the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript 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.Scopefor Steel Products for Shipment1.1 This specification covers grades of hot-formed weldedA751 Test Methods,Practices,and Temminology for Chemi-and seamless high-strength low-alloy square,rectangular,cal Analysis of Steel Productsround,or special shape structural tubing for welded,riveted,orG101 Guide for Estimating the Atmospheric Corrosion Re-bolted construction of bridges and buildings and for generalsistance of Low-Alloy Steelsstructural purposes.When the steel is used in weldedconstruction,the welding procedure shall be suitable for the3.Ordering Informationsteel and the intended service.3.1 Orders for material under this specification should1.2 Grade II has atmospheric corrosion resistance equiva-include the following as required to describe the materiallent to that of carbon steel with copper (0.20 minimum Cu)adequately:Grades la and Ib have atmospheric corrosion resistance sub-3.1.1 Quantity (feet,metres,or number of lengths),stantially better than that of Grade II(Note 1).When properly3.1.2 Grade (Table 1 and Table 2).exposed to the atmosphere,Grades la and Ib can be used bare3.1.3 Material (round,square,or rectangular tubing),(unpainted)for many applications.When enhanced corrosion3.1.4 Method of manufacture (seamless,buttwelded,orresistance is desired,Grade III,copper limits may be specified.hot-stretch-reduced electric-resistance welded).3.1.5 Size (outside diameter and nominal wall thickness forNorE 1-For methods of estimating the atmospheric corrosion resis-round tubing and the outside dimensions and calculated nomi-tance of low alloy steels see Guide G101 or actual data.nal wall thickness for square and rectangular tubing),1.3 The values stated in either SI units or inch-pound units3.1.6 Length (specific or random,see 8.2),are to be regarded separately as standard.Within the text,the3.1.7 End condition (see 9.2).SI units are shown in brackets.The values stated in each3.1.8 Burr removal (see 9.2),system may not be exact equivalents;therefore,each system3.1.9 Certification (see 12.1),shall be used independently of the other.Combining values3.1.10 Specification designation (A618 or A618M,includ-from the two systems may result in non-conformance with theing yeardate),standard.3.1.11 End use,and3.1.12 Special requirements.2.Referenced Documents2.1 ASTM Standards:24.ProcessA370 Test Methods and Definitions for Mechanical Testing4.1 The steel shall b