ASTM B839-2004(2009) Standard Test Method for Residual Embrittlement in Metallic Coated Externally Threaded Articles Fasteners and Rod&8212 Inclined Wedge Method《金属镀覆的外螺纹制品 紧固件和棒的残.pdf
《ASTM B839-2004(2009) Standard Test Method for Residual Embrittlement in Metallic Coated Externally Threaded Articles Fasteners and Rod&8212 Inclined Wedge Method《金属镀覆的外螺纹制品 紧固件和棒的残.pdf》由会员分享,可在线阅读,更多相关《ASTM B839-2004(2009) Standard Test Method for Residual Embrittlement in Metallic Coated Externally Threaded Articles Fasteners and Rod&8212 Inclined Wedge Method《金属镀覆的外螺纹制品 紧固件和棒的残.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B839 04 (Reapproved 2009)Standard Test Method forResidual Embrittlement in Metallic Coated, ExternallyThreaded Articles, Fasteners, and RodInclined WedgeMethod1This standard is issued under the fixed designation B839; the number immediately following the designation indicates the year o
2、foriginal 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.INTRODUCTIONWhen atomic hydrogen enters steels and certain other alloy
3、s, it can cause loss of ductility or loadcarrying ability or cracking (usually as submicroscopic cracks), or catastrophic brittle failures atapplied stresses well below the yield strength or even the normal design strength for the alloys. Thisphenomenon often occurs in alloys that show no significan
4、t loss in ductility, when measured byconventional tensile tests, and is frequently referred to as hydrogen-induced delayed brittle failure,hydrogen stress cracking, or hydrogen embrittlement. The hydrogen can be introduced duringcleaning, pickling, phosphating, electroplating, autocatalytic processe
5、s, and in the service environmentas a result of cathodic protection reactions or corrosion reactions. Hydrogen can also be introducedduring fabrication, for example, during roll forming, machining, and drilling due to lubricantbreakdown as well as during welding or brazing operations.1. Scope1.1 Thi
6、s test method covers the determination of, on astatistical basis, the probability of the existence of hydrogenembrittlement or degradation in:1.1.1 A batch of barrel electroplated, autocatalytic plated,phosphated, or chemically processed threaded articles or fas-teners and1.1.2 A batch of rack plate
7、d threaded articles, fasteners, orrod.1.2 Industrial practice for threaded articles, fasteners, androd has evolved three graduated levels of test exposure toensure reduced risk of hydrogen embrittlement (see Section 3).These levels have evolved from commercial applicationshaving varying levels of cr
8、iticality. In essence, they representthe confidence level that is required. They also represent thetime that finished goods are held before they can be shippedand used. This time equates to additional cost to the manufac-turer that may of necessity be added to the cost of the finishedgoods.1.3 This
9、test method is applicable to threaded articles,fasteners, and rod made from steel with $1000 MPa (withcorresponding hardness values of 300 HV10 kgf, 303 HB, or 31HRc) or surface hardened threaded articles, fasteners, or rod.1.4 This test method shall be carried out after hydrogenembrittlement relief
10、 heat treatment in accordance with therequirements of Guide B850. It may also be used for assessingdifferences in processing solutions, conditions, and techniques.This test method has two main functions: first, when used witha statistical sampling plan it can be used for lot acceptance orrejection,
11、and second, it can be used as a control test todetermine the effectiveness of the various processing stepsincluding pre- and post-baking treatments to reduce the mobilehydrogen in the articles, fasteners, or rod. While this testmethod is capable of indicating those items that are embrittledto the ex
12、tent defined in Section 3, it does not guaranteecomplete freedom from embrittlement.1.5 This test method does not relieve the processor fromimposing and monitoring suitable process control.1.6 This test method has been coordinated with ISO/DIS10587 and is technically equivalent. (WarningGreat caresh
13、ould be taken when applying this test method. The heads ofembrittled articles, fasteners, or rod may suddenly break offand become flying projectiles capable of causing blindness orother serious injury. This hazard can occur as long as 200 hafter the test has started. Hence, shields or other apparatu
14、sshould be provided to avoid such injury.)NOTE 1Test Method F1940 can be used as a process control andverification to prevent hydrogen embrittlement in fasteners covered by thistest method.1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the d
15、irect responsibility of Subcommittee B08.10 onTest Methods.Current edition approved Sept. 1, 2009. Published December 2009. Originallyapproved in 1994. Last previous edition approved in 2004 as B839 04. DOI:10.1520/B0839-04R09.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West C
16、onshohocken, PA 19428-2959, United States.NOTE 2The use of inhibitors in acid pickling baths does not neces-sarily guarantee avoidance of hydrogen embrittlement.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the us
17、er of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB697 Guide for Selection of Sampling P
18、lans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsF436 Specification for Hardened Steel WashersB850 Guide for Post-Coating Treatments of Steel for Re-ducing the Risk of Hydrogen EmbrittlementF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Pl
19、ated or CoatedFasteners2.2 ISO Standards:ISO/DIS 10587 Residual Embrittlement in Metallic Coated,Externally Threaded Articles, Fasteners and RodInclined Wedge Method3ISO 4519 Electrodeposited Metallic Coatings and RelatedFinishesSampling Procedures for Inspection by At-tributes42.3 Military Standard
20、:MIL-STD-1312 Fastener Test Methods43. Terminology3.1 DefinitionsFor the purposes of this test method thefollowing definitions apply:3.1.1 batcha distinct portion of items processed collec-tively as a single group through the same identical treatmentsteps at the same time on the same rack or in the
21、same barrel.3.1.2 embrittledwhere parts fail immediately or up to 48h in test.3.1.2.1 DiscussionThe degree to which parts within asingle plated batch or a given lot can be embrittled can varyover a wide range. The degree of embrittlement is a function ofthe concentration of atomic hydrogen in the in
22、dividual parts inthe batch or lot, measured in parts per million, and in particularthat portion of the hydrogen that is mobile or free to migrate toareas of high stress concentration.3.1.3 Grade 48 proofwhere there are no failures after 48h of test.3.1.4 Grade 96 proofwhere there are no failures aft
23、er 96h of test.3.1.5 Grade 200 proofwhere there are no failures after200 h of test.3.1.6 lota group of items processed through the same orsimilar steps at the same time or over a contiguous time periodand from the same heat of material. The lot may be brokendown into a number of batches for processi
24、ng purposes andthen reassembled into the same lot.4. Summary of Test Method4.1 The threaded articles, fasteners, or rod are subjected tostress by tensioning with a mating nut after insertion through aclearance hole in a hardened rectangular wedge of steel; seeFig. 1. Additional hardened rectangular
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