1、Designation:A55016Standard 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 revision.A number in parentheses indic
2、ates 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 Ferrocolum-bium(ferroniobium),designated Low-Alloy Steel Grade,Al-loy and Stainless Steel Grade,and High-Purity Grade.1.2 T
3、he values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A1025 Specification for Ferroalloys and Other All
4、oyingMaterials,General RequirementsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.General Conditions for Delivery3.1 Materials furnished to this specification shall conform tothe requirements of Specification A1025,including any supple-mentary requirements that are indicated in th
5、e purchase order.Failure to comply with the general requirements of Specifica-tion A1025 constitutes nonconformance with this specification.In case of conflict between the requirements of this specifica-tion and Specification A1025,this specification shall prevail.4.Chemical Composition4.1 The mater
6、ial shall conform to the requirements as tochemical composition specified in Tables 1 and 2.The manu-facturer shall furnish an analysis of each shipment 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 reques
7、t 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 periodmutually agreed upon by the manufacturer and the purchaser.5.Sizing5.1 Ferrocolumbium(ferroniobium)is available in sizes andto tolerances shown in Tabl
8、e 3.6.Keywords6.1 columbium(niobium);ferrocolumbium(ferroniobium);tantalum1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved May 1,2016.Published M
9、ay 2016.Originallyapproved in 1965.Last previous edition approved in 2015 as A550 06(2015).DOI:10.1520/A0550-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the stand
10、ards Document Summary page onthe ASTM website.*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 States1 TABLE 1 Chemical RequirementsElementComposition,%Low-Alloy SteelGradeAlloy and
11、StainlessSteel GradeHigh-PurityGradeColumbium(Niobium)A,E60.070.060.070.060.070.0Tantalum,max5.02.00.50BCarbon,max0.50.30.10Manganese,max3.02.00.50Silicon,max4.02.50.40Aluminum,max3.0C2.0C2.0DTin,max0.250.150.02Phosphorus,max0.100.050.02Sulfur,max0.100.050.02AThe columbium(niobium)content of any shi
12、pment shall be reported to thenearest 0.1%.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.EColumbium(Cb)and niobium(Nb)refer to the same Element 41.TABLE 2 Supplemental Chemical Re
13、quirementsNOTE1These are maximum limits allowable unless otherwisestated.AElementComposition,%ALow-AlloySteel GradeAlloy and StainlessSteel GradeHigh-PurityGradeChromium1.001.000.10Tungsten1.000.50.05Titanium1.001.00.10Lead0.250.010.01Cobalt0.250.050.05AThe composition of the ferrocolumbium(ferronio
14、bium)shall be within theselimits;however,an analysis of each lot is not required.Upon request,themanufacturer shall supply the results of an analysis for these elements on termspreviously agreed upon by the manufacturer and purchaser.TABLE 3 Standard Sizes and TolerancesStandard SizeToleranceAFriabi
15、lityRating2 in.by down10%max retainedon 2-in.(50-mm)sieve410%max passingNo.8(2.36-mm)sieve12in.by down10%max retainedon-in.(12.5-mm)sieve4 in.by down10%max retainedon-in.(6.3-mm)sieve48 mesh by down10%max retainedon No.8(2.36-mm)sieve420 mesh by down10%max retainedon No.20(0.85-mm)sieve4ASpecificati
16、ons of sieve sizes used to define tolerances herein are as listed inSpecification E11.A550 162 SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A550 06(2015)that may impact the use of this standard.(Approved May 1,2016.)(1)Where columbium is referenced,niobium was added inparentheses;where ferrocolumbium is referenced,ferronio-bium was added in parentheses.(2)Footnote E was added to Table 1 stating that Columbium(Cb)and Niobium
