ASTM_G_146_-_01_2013.pdf

Designation:G14601(Reapproved 2013)Standard Practice forEvaluation of Disbonding of Bimetallic Stainless Alloy/SteelPlate for Use in High-Pressure,High-Temperature RefineryHydrogen Service1This standard is issued under the fixed designation G146;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for the evaluation ofdisbonding of bimetallic stainless alloy/steel plate for use inrefinery high-pressure/high-temperature(HP/HT)gaseous hy-drogen service.It includes procedures to(1)produce suitablelaboratory test specimens,(2)obtain hydrogen charging con-ditions in the laboratory that are similar to those found inrefinery HP/HT hydrogen gas service for evaluation of bime-tallic specimens exposed to these environments,and(3)perform analysis of the test data.The purpose of this practiceis to allow for comparison of data among test laboratories onthe resistance of bimetallic stainless alloy/steels to hydrogen-induced disbonding(HID).1.2 This practice applies primarily to bimetallic productsfabricated by weld overlay of stainless alloy onto a steelsubstrate.Most of the information developed using this prac-tice has been obtained for such materials.The proceduresdescribed herein,may also be appropriate for evaluation of hotroll bonded,explosive bonded,or other suitable processes forapplying stainless alloys on steel substrates.However,due tothe broad range of possible materials,test conditions,andvariations in test procedures,it is up to the user of this practiceto determine the suitability and applicability of these proce-dures for evaluation of such materials.1.3 This practice is intended to be applicable for evaluationof materials for service conditions involving severe hydrogencharging which may produce HID as shown in Fig.1 forstainless steel weld overlay on steel equipment(see Refs 1 and2 in Appendix X1).However,it should be noted that thispractice may not be appropriate for forms of bimetallicconstruction or service conditions which have not been ob-served to cause HID in service.1.4 Additional information regarding the evaluation of bi-metallic stainless alloy/steel plate for HID,test methodologies,and the effects of test conditions,materials,and weldingvariables,and inspection techniques is given in Appendix X1.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See Section 6 foradditional safety information.2.Referenced Documents2.1 ASTM Standards:2G111 Guide for Corrosion Tests in High Temperature orHigh Pressure Environment,or BothE3 Guide for Preparation of Metallographic Specimens2.2 ASME Standard:Boiler and Pressure Vessel Code Section V,Article 5,Tech-nique Two33.Terminology3.1 Definitions:3.1.1 HIDa delamination of a stainless alloy surface layerfrom its steel substrate produced by exposure of the material toa hydrogen environment.3.1.1.1 DiscussionThis phenomenon can occur in inter-nally stainless alloy lined steel equipment by the accumulationof molecular hydrogen in the region of the metallurgical bondat the interface between the steel and stainless alloy surfacelayer produced by exposure to service conditions involvingHP/HT hydrogen in the refinery hydroprocessing.1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved May 1,2013.Published July 2013.Originally approvedin 1996.Last previous edition in 2007 as G14601(2007).DOI:10.1520/G0146-01R13.2For 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 American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Practice4.1 Stainless alloy/steel specimens are exposed to a gaseoushydrogen containing environment at HP/HT conditions forsufficient time to produce hydrogen charging in the material.Following exposure,the specimens are cooled to ambienttemperature at a controlled rate.The specimens are then held atroom temperature for a designated period to allow for thedevelopment of HID between the stainless