ASTMA789

Designation:A 789/A 789M-01aAn American Natona StandardNTERNATIONALStandard Specification forSeamless and Welded Ferritic/Austenitic Stainless SteelTubing for General ServiceThis standard is issued under the fixed designation A 789/A 789M;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 (e)indicates an editorial change since the last revision or reapproval.1.ScopeTABLE 1 Tensile and Hardness Requirements1.1 This specification2 covers grades of nominal wall thick-TensileYieldElongation Hardness,maxness,stainless steel tubing for services requiring generalStrength,Strength,in 2 in.orUNS Designationmin,ksimin,ksi50 mm.Rock-Brinellcorrosion resistance,with particular emphasis on resistance to[MPa][MPa]min,%well Cstress corrosion cracking.These steels are susceptible toS318039062065450]2529030.5embrittlement if used for prolonged periods at elevated tem-53220559555)7048月2529030.5peratures.S315009230644403029030.5S32550110760]80550]1529731.5921200Nom 1-For tubing smaller than in.[12.7 mm]in outside diameter1009065450]the elongation values given for strip specimens in Table 1 shall apply.S31260410090]65450]30.5S3200190【620]654502529030Mechanical property requirements do not apply to tubing smaller thanS32304in.[3.2 mm]in outside diameter or with walls thinner than 0.015 in.[0.4OD 1 in.[25 mm]andmm].Under100906545025OD over 1 in.25 mm]87B0058400]29030.51.2 The values stated in either inch-pound units or SI unitsS39274116【8008055015310are to be regarded separately as standard.Within the text,theS32750116800180550)]31032S32760SI units are shown in brackets.The values stated in each109750]8055025300system are not exact equivalents;therefore,each system mustS329009016201704852712be used independently of the other.Combining values from theS32950P100e9070480]229030.5S3927712082590俗20]290two systems may result in nonconformance with the specifi.S32520112[7708055025310cation.The inch-pound units shall apply unless the Mdesig-S32906nation of this specification is specified in the order.Wall below 0.40 in116[800945025310(10mm)2.Referenced Documentswa0.40in.(10mm)1097508055025310eand above2.1 ASTM Standards:A Prior to A 789/A 789M-87,the values for S31260 were:92 ksi tensileA 450/A 450M Specification for General Requirements forCarbon,Ferritic Alloy,and Austenitic Alloy Steel Tubes3abe00 r UNSS32950.A 480/A 480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,SAE J1086 Practice for Numbering Metals and AlloysSheet,and Strip(UNS)A 941 Terminology Relating to Steel,Stainless Steel,Re-lated Alloys,and Feroalloys33.TerminologyE 527 Practice for Numbering Metals and Alloys(UNS)33.1 Definitions-For definitions of terms used in this speci-2.2 SAE Standard:5fication,refer to Terminology A 941.4.Ordering InformationThis specification is under the jurisdic