1、Designation: A 550 06Standard Specification forFerrocolumbium1This standard is issued under the fixed designation A 550; 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 t
2、he year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers three grades of ferrocolum-bium, designated Low-Alloy Steel Grade, Alloy and StainlessSteel Grade, and High-Purity Grade.1.2 The values stat
3、ed in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2A 1025 Specification for Ferroalloys and Other AlloyingMaterials, General RequirementsE11 Specification for Wire Cloth and Sieves for TestingPurposes3. General Conditions for Delivery3.1 Materials fur
4、nished to this specification shall conform tothe requirements of Specification A 1025, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A 1025 constitutes nonconformance with thisspecification. In case of
5、 conflict between the requirements ofthis specification and Specification A 1025, this specificationshall prevail.4. Chemical Composition4.1 The material shall conform to the requirements as tochemical composition specified in Tables 1 and 2. The manu-facturer shall furnish an analysis of each shipm
6、ent showing thepercentage of each element specified in Table 1.4.2 For elements specified in Table 2 an analysis of each lotis not required. Upon request of the purchaser, the manufac-turer shall supply the results of an analysis for the elementsspecified in Table 2 on a cumulative basis over a peri
7、odmutually agreed upon by the manufacturer and the purchaser.5. Sizing5.1 Ferrocolumbium is available in sizes and to tolerancesshown in Table 3.6. Keywords6.1 columbium; ferrocolumbium; tantalum1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related
8、 Alloys and is the direct responsibility of SubcommitteeA 01.18 on Castings.Current edition approved July 1, 2006. Published July 2006. Originally approvedin 1965. Last previous edition approved in 2000 as A 550 78 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontac
9、t ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Chemical RequirementsElement Composition, %Low-Alloy SteelGradeAlloy and StainlessSteel GradeHigh-PurityGradeColumbiumA60.070.0 60.
10、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 3.0C2.0C2.0DTin, max 0.25 0.15 0.02Phosphorus, max 0.10 0.05 0.02Sulfur, max 0.10 0.05 0.02Athe columbium content of any shipment shall be reported to the nearest 0.1 %.
11、BOr 0.25 % maximum as agreed between purchaser and seller.COr 1.50 % maximum as agreed between purchaser and seller.DOr 1.0 maximum as agreed between purchaser and seller.TABLE 2 Supplemental Chemical RequirementsNOTEThese are maximum limits allowable unless otherwise stated.AElement Composition, %A
12、Low-AlloySteel GradeAlloy and StainlessSteel GradeHigh-PurityGradeChromium 1.00 1.00 0.10Tungsten 1.00 0.5 0.05Titanium 1.00 1.0 0.10Lead 0.25 0.01 0.01Cobalt 0.25 0.05 0.05AThe composition of the ferrocolumbian shall be within these limits; however, ananalysis of each lot is not required. Upon requ
13、est, the manufacturer shall supplythe results of an analysis for these elements on terms previously agreed upon bythe manufacturer and purchaser.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
14、19428-2959, United States.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue, A 550 78(2000), that may impact the use of this standard. (Approved July 1, 2006.)(1) Deleted three existing references and added A 1025 inparagraph 2.1.(2
15、) Reference to A 1025 included and deleted ordering infor-mation in Section 3.(3) Revised statement regarding Tables 1 and 2 in paragraphs4.1 and 4.2.(4) Paragraph 5.1 revised to reference Table 3 and paragraph5.2 deleted.(5) Deleted Sections 6 9.(6) Revised Tables 1 and 2.ASTM International takes n
16、o position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users 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 respon
17、sibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five 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
18、to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the ad
19、dress shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 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)
20、, 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 3 Standard Sizes and TolerancesStandard Size ToleranceAFriabilityRating2 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 -in. (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) sieve4ASpecifications of sieve sizes used to define tolerances herein are as listed inSpecification E11.A550062
