1、Designation:B85098(Reapproved 2015)Standard Guide forPost-Coating Treatments of Steel for Reducing the Risk ofHydrogen Embrittlement1This standard is issued under the fixed designation B850;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,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.INTRODUCTIONWhen atomic hydrogen enters steel,it can cause a loss of ductility,load carrying ability,or cracking(usua
3、lly as submicroscopic cracks),as well as catastrophic brittle failures at applied stresses wellbelow the yield strength or even the normal design strength for the alloys.This phenomenon oftenoccurs in alloys that show no significant loss in ductility,when measured by conventional tensile tests,and i
4、s referred to frequently as hydrogen-induced delayed brittle failure,hydrogen stress cracking,orhydrogen embrittlement.The hydrogen can be introduced during cleaning,pickling,phosphating,electroplating,autocatalytic processes,porcelain enameling,and in the service environment as a resultof cathodic
5、protection reactions or corrosion reactions.Hydrogen can also be introduced duringfabrication,for example,during roll forming,machining,and drilling,due to the breakdown ofunsuitable lubricants,as well as during welding or brazing operations.1.Scope1.1 This guide covers procedures for reducing the s
6、uscep-tibility in some steels to hydrogen embrittlement or degrada-tion that may arise in the finishing processes.1.2 The heat treatment procedures established herein maybe effective for reducing susceptibility to hydrogen embrittle-ment.This heat-treatment procedure shall be used after platingopera
7、tions but prior to any secondary conversion coatingoperation.1.3 This guide has been coordinated with ISO/DIS 9588 andis technically equivalent.NOTE1The heat treatment does not guarantee complete freedom fromthe adverse effects of hydrogen degradation.1.4 The values stated in SI units are to be rega
8、rded asstandard.No other units of measurement are included in thisstandard.1.5 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 t
9、he applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A919 Terminology Relating to Heat Treatment of Metals(Withdrawn 1999)3B374 Terminology Relating to ElectroplatingB851 Specification for Automated Controlled Shot Peeningof Metallic Articles Prior to Ni
10、ckel,Autocatalytic Nickel,or Chromium Plating,or as Final Finish2.2 ISO Standards:ISO2080 ElectroplatingandRelatedProcessesVocabulary4ISO DIS 9588 Post-Coating Treatments of Iron or Steel forReducing the Risk of Hydrogen Embrittlement42.3 Federal Standard:QQ-C-320 Chromium Plating(Electrodeposited)5
11、3.Terminology3.1 DefinitionsMany of the terms used in this guide can befound in Terminology B374,A919,or ISO 2080.1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatingsand is the direct responsibility of SubcommitteeB08.02 on Pre Treatment.Current editi
12、on approved Jan.1,2015.Published January 2015.Originallyapproved in 1994.Last previous edition approved in 2009 as B85098(2009).DOI:10.1520/B0850-98R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandar
13、ds volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Availabl
14、e from Standardization Documents Order Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-5098Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Requirements4.1 Heat treatment may be performed on coated metals toreduce the
15、 risk of hydrogen embrittlement.The duration ofheat treatment in all cases shall commence from the time atwhich the whole of each part attains the specified temperature.4.2 Parts made from steel with actual tensile strengths1000 MPa(with corresponding hardness values of 300HV10kgf,303 HB,or 31 HRC)a
16、nd surface-hardened parts mayrequire heat treatment unless Class ER-0 is specified.Prepara-tion involving cathodic treatments in alkaline or acid solutionsshall be avoided.Additionally,the selection of electroplatingsolutions with high cathodic efficiencies is recommended forsteel components with tensile strengths above 1400 MPa(withcorresponding hardness values of 425 HV10kgf,401 HB,or 43HRC).4.3 Table 1 provides a list of embrittlement-relief heat-treatment classes from which the purchaser may
