ASTM A763-1993(2009) Standard Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels《铁素体不锈钢晶间腐蚀敏感性检测的标准作法》.pdf
《ASTM A763-1993(2009) Standard Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels《铁素体不锈钢晶间腐蚀敏感性检测的标准作法》.pdf》由会员分享,可在线阅读,更多相关《ASTM A763-1993(2009) Standard Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels《铁素体不锈钢晶间腐蚀敏感性检测的标准作法》.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A 763 93 (Reapproved 2009)Standard Practices forDetecting Susceptibility to Intergranular Attack in FerriticStainless Steels1This standard is issued under the fixed designation A 763; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 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 These practices cover the following four tests:1.1.1 Practice WOxalic acid etch test for det
3、ecting sus-ceptibility to intergranular attack in stabilized ferritic stainlesssteels by classification of the etching structures (see Sections 3through 10).1.1.2 Practice XFerric sulfate-sulfuric acid test for detect-ing susceptibility to intergranular attack in ferritic stainlesssteels (Sections 1
4、1 to 16).1.1.3 Practice YCopper-copper sulfate-50 % sulfuric acidtest for detecting susceptibility to intergranular attack in ferriticstainless steels (Sections 17 to 22).1.1.4 Practice ZCopper-copper sulfate-16 % sulfuric acidtest for detecting susceptibility to intergranular attack in ferriticstai
5、nless steels (Sections 23 to 29).1.2 The following factors govern the application of thesepractices (1-6)2:1.2.1 Practice W, oxalic acid test, is a rapid method ofidentifying, by simple, electrolytic etching, those specimens ofcertain ferritic alloys that are not susceptible to intergranularcorrosio
6、n associated with chromium carbide precipitation.Practice W is used as a screening test to avoid the necessity, foracceptable specimens, of more extensive testing required byPractices X, Y, and Z. See Table 1 for a listing of alloys forwhich Practice W is appropriate.1.2.2 Practices X, Y, and Z can
7、be used to detect thesusceptibility of certain ferritic alloys to intergranular attackassociated with the precipitation of chromium carbides ornitrides.1.2.3 Practices W, X, Y, and Z can also be used to evaluatethe effect of heat treatment or of fusion welding on suscepti-bility to intergranular cor
8、rosion.1.2.4 Table 2 lists the identification ferritic stainless steelsfor which data on the application of at least one of the standardpractices is available.1.2.5 Some stabilized ferritic stainless steels may show highrates when tested by Practice X because of metallurgicalfactors not associated w
9、ith chromium carbide or nitride pre-cipitation. This possibility must be considered in selecting thetest method. Combinations of alloys and test methods forwhich successful experience is available are shown in Table 1.Application of these standard tests to the other ferritic stainlesssteels will be
10、by specific agreement between producer and user.1.3 Depending on the test and alloy, evaluations may beaccomplished by weight loss determination, microscopicalexamination, or bend test (Sections 30 and 31). The choices arelisted in Table 1.1.4 This standard does not purport to address all of thesafe
11、ty problems, 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. For specific safetyprecautionary statements, see 3.2.5, Section 7, 13.1, a
12、nd 19.1.2. Referenced Documents2.1 ASTM Standards:3A 370 Test Methods and Definitions for Mechanical Testingof Steel Products3. Apparatus3.1 Apparatus for Practice W, Oxalic Acid Etch Test:3.1.1 Source of DCBattery, generator, or rectifier capableof supplying 15 V and 20 A.3.1.2 Ammeter, range 0 to
13、30 A.3.1.3 Variable Resistance, for control of specimen current.3.1.4 CathodeOne-litre stainless steel beaker or suitablepiece of stainless steel.3.1.5 Electric Clamp, to hold etched specimen.3.1.6 Metallurgical Microscope, for examination of etchedstructures at 250 to 5003.3.1.7 ElectrodesThe speci
14、men is made the anode and thebeaker or other piece of stainless steel the cathode.1These practices are under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and are the direct responsibility of SubcommitteeA01.14 on Methods of Corrosion Testing.Current edition appr
15、oved April 1, 2009. Published April 2009. Originallyapproved in 1979. Last previous edition approved in 2004 as A 763 93 (2004).2The boldface numbers in parentheses refer to the list of references appended tothese practices.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcont
16、act ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.8 ElectrolyteOxali
17、c acid (H2C2O42H2O) reagentgrade, 10 weight % solution.3.2 The apparatus common to Practices X, Y, and Z is listedbelow. Supplementary requirements are noted as required.3.2.1 The apparatus used is shown in Fig. 1.NOTE 1No substitution for this equipment may be used. The cold-finger type of condense
18、r with standard Erlenmeyer flasks may not be used.3.2.2 Allihn or Soxhlet Condenser, four-bulb (minimum)with a 45/50 ground-glass joint. Overall length shall be about330 mm (13 in.) with condensing section, 241 mm (912 in.).3.2.3 Erlenmeyer Flask, 1-L with a 45/50 ground-glassjoint. The ground-glass
19、 opening is somewhat over 38 mm (112in.) wide.3.2.4 Glass Cradles (Note 2) can be supplied by a glassblowing shop. The size of the cradles should be such that theycan pass through the ground-glass joint of the Erlenmeyerflask. They should have three or four holes in them to increasecirculation of th
20、e test solution around the specimen.NOTE 2Other equivalent means of specimen support such as glasshooks or stirrups may also be used.3.2.5 Boiling Chips, must be used to prevent bumping. Ithas been reported that violent boiling resulting in acid spillscan occur. It is important to ensure that the co
21、ncentration ofacid does not become more concentrated and that an adequatenumber of boiling chips (which are resistant to attack by thetest solution) are present.43.2.6 Silicone Grease, is recommended for the ground-glassjoint.4Amphoteric alundum granules, Hengar Granules, from the Hengar Company,Phi
22、ladelphia, PA have been found satisfactory for this purpose.TABLE 1 Methods for Evaluating Ferritic Stainless Steels for Susceptibility to Intergranular CorrosionAlloy Time of Test, hEvaluation CriteriaWeight Loss MicroscopicalExaminationBend TestPRACTICE WOXALIC ACID ETCH TEST439 0.025 NA AANA18Cr-
23、2Mo 0.025 NA AANAXM27 0.025 NA AANAXM33 0.025 NA AANA26-3-3 0.025 NA AANAPRACTICE XFERRIC SULFATE - SULFURIC ACID TEST430 24 AB,CANA446 72 ACXM27 120 ADACNA29Cr-4Mo 120 NAEACNA29Cr-4Mo-2Ni 120 NA ACNAPRACTICE YCOPPER-COPPER SULFATE - 50% SULFURIC ACID TEST446 96 ACANAXM27 120 ADACNAXM33 120 ADACNA26
24、33 120 ADACNA29-4C 120 ADACNA29Cr-4Mo 120 NA ACNA29Cr-4Mo-2Ni 120 NA ACNAPRACTICE ZCOPPER-COPPER SULFATE - 16% SULFURIC ACID TEST430 24 NA NA no fissures434 24 NA NA no fissures436 24 NA NA no fissures439 24 NA NA no fissures18Cr-2Mo 24 NA NA no fissuresAPolished surface examined at 250 to 5003 with
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