1、Designation: A550 06 (Reapproved 2015)A550 16Standard Specification forFerrocolumbium (Ferroniobium)1This standard is issued under the fixed designation A550; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers three grades of ferrocolumbium, Ferrocolumbium (ferroniobium), designated Low-Alloy SteelGrade, Alloy a
3、nd Stainless Steel Grade, and High-Purity Grade.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.2. Referenced Documents2.1 ASTM Sta
4、ndards:2A1025 Specification for Ferroalloys and Other Alloying Materials, General RequirementsE11 Specification for Woven Wire Test Sieve Cloth and Test Sieves3. General Conditions for Delivery3.1 Materials furnished to this specification shall conform to the requirements of Specification A1025, inc
5、luding anysupplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecification A1025 constitutes nonconformance with this specification. In case of conflict between the requirements of thisspecification and Specification A1025, this spe
6、cification shall prevail.4. Chemical Composition4.1 The material shall conform to the requirements as to chemical composition specified in Tables 1 and 2. The manufacturershall furnish an analysis of each shipment showing the percentage of each element specified in Table 1.4.2 For elements specified
7、 in Table 2 an analysis of each lot is not required. Upon request of the purchaser, the manufacturershall supply the results of an analysis for the elements specified in Table 2 on a cumulative basis over a period mutually agreedupon by the manufacturer and the purchaser.5. Sizing5.1 Ferrocolumbium
8、(ferroniobium) is available in sizes and to tolerances shown in Table 3.6. Keywords6.1 columbium; columbium (niobium); ferrocolumbium; ferrocolumbium (ferroniobium); tantalum1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the dir
9、ect responsibility of Subcommittee A01.18on Castings.Current edition approved Nov. 15, 2015May 1, 2016. Published November 2015May 2016. Originally approved in 1965. Last previous edition approved in 20102015 asA550 06 (2010).(2015). DOI: 10.1520/A0550-06R15.10.1520/A0550-16.2 For referencedASTM sta
10、ndards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an
11、ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as publish
12、ed by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 1 Chemical RequirementsElement Composition, %Low-Alloy SteelGr
13、adeAlloy and StainlessSteel GradeHigh-PurityGradeColumbium (Niobium)A, E 60.070.0 60.070.0 60.070.0Tantalum, max 5.0 2.0 0.50BCarbon, max 0.5 0.3 0.10Manganese, max 3.0 2.0 0.50Silicon, max 4.0 2.5 0.40Aluminum, max 3.0C 2.0C 2.0DTin, max 0.25 0.15 0.02Phosphorus, max 0.10 0.05 0.02Sulfur, max 0.10
14、0.05 0.02Athe The columbium (niobium) content of any shipment shall be reported to thenearest 0.1 %.B Or 0.25 % maximum as agreed between purchaser and seller.C Or 1.50 % maximum as agreed between purchaser and seller.D Or 1.0 maximum as agreed between purchaser and seller.E Columbium (Cb) and niobi
15、um (Nb) refer to the same Element 41.TABLE 2 Supplemental Chemical RequirementsNOTE 1These are maximum limits allowable unless otherwisestated.AElement Composition, %ALow-AlloySteel GradeAlloy and StainlessSteel GradeHigh-PurityGradeChromium 1.00 1.00 0.10Tungsten 1.00 0.5 0.05Titanium 1.00 1.0 0.10
16、Lead 0.25 0.01 0.01Cobalt 0.25 0.05 0.05A The composition of the ferrocolumbian ferrocolumbium (ferroniobium) shall bewithin these limits; however, an analysis of each lot is not required. Upon request,the manufacturer shall supply the results of an analysis for these elements onterms previously agr
17、eed upon by the manufacturer and purchaser.TABLE 3 Standard Sizes and TolerancesStandard Size ToleranceA FriabilityRating2 in. by down 10 % max retainedon 2-in. (50-mm)sieve410 % max passingNo. 8 (2.36-mm)sieve12 in. by down 10 % max retainedon -in. (12.5-mm)sieve4 in. by down 10 % max retainedon -i
18、n. (6.3-mm)sieve48 mesh by down 10 % max retainedon No. 8 (2.36-mm)sieve420 mesh by down 10 % max retainedon No. 20 (0.85-mm) sieve4A Specifications of sieve sizes used to define tolerances herein are as listed inSpecification E11.A550 162SUMMARY OF CHANGESCommittee A01A01 has identified the locatio
19、n of selected changes to this standard since the last issue, issue(A550 78A550 06 (2015) (2000), ) that may impact the use of this standard. (Approved May 1, 2016July 1,2006.).)(1) Deleted three existing references and Where columbium is referenced, niobium was added A1025in paragraphparentheses;2.1
20、.where ferrocolumbium is referenced, ferroniobium was added in parentheses.(2) Reference to A1025 included and deleted ordering information in Section 3.(3) Revised statement regarding Tables 1 and 2 in paragraphs 4.1 and 4.2.(2) Paragraph 5.1 revised to reference Footnote E was added to Table 31 an
21、d paragraph 5.2 deleted.stating that Columbium (Cb)and Niobium (Nb) refer to the same Element 41.(5) Deleted Sections 6 9.(6) Revised Tables 1 and 2.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users
22、 of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every f
23、ive years andif not revised, either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical
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25、A 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 163
