ASTM A550-16(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A550 −16 (Reapproved 2021)
Standard Specification for
Ferrocolumbium (Ferroniobium)
This standard is issued under the fixed designation A550; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
1.1 This specification covers three grades of Ferrocolum-
bium (ferroniobium), designated Low-Alloy Steel Grade, Al-
3. General Conditions for Delivery
loy and Stainless Steel Grade, and High-Purity Grade.
3.1 Materialsfurnishedtothisspecificationshallconformto
1.2 The values stated in inch-pound units are to be regarded
the requirements of Specification A1025/A1025M, including
as standard. The values given in parentheses are mathematical
any supplementary requirements that are indicated in the
conversions to SI units that are provided for information only
purchase order. Failure to comply with the general require-
and are not considered standard.
ments of Specification A1025/A1025M constitutes nonconfor-
mance with this specification. In case of conflict between the
1.3 This international standard was developed in accor-
requirements of this specification and Specification A1025/
dance with internationally recognized principles on standard-
A1025M, this specification shall prevail.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Chemical Composition
mendations issued by the World Trade Organization Technical
4.1 The material shall conform to the requirements as to
Barriers to Trade (TBT) Committee.
chemical composition specified in Tables 1 and 2. The manu-
facturer shall furnish an analysis of each shipment showing the
2. Referenced Documents
percentage of each element specified in Table 1.
2.1 ASTM Standards:
4.2 For elements specified in Table 2 an analysis of each lot
A1025/A1025M Specification for Ferroalloys and Other Al-
is not required. Upon request of the purchaser, the manufac-
loying Materials, General Requirements
turer shall supply the results of an analysis for the elements
specified in Table 2 on a cumulative basis over a period
mutually agreed upon by the manufacturer and the purchaser.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
5. Sizing
A01.18 on Castings.
5.1 Ferrocolumbium(ferroniobium)isavailableinsizesand
Current edition approved March 1, 2021. Published March 2021. Originally
approved in 1965. Last previous edition approved in 2016 as A550 – 16. DOI:
to tolerances shown in Table 3.
10.1520/A0550-16R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Keywords
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 columbium (niobium); ferrocolumbium (ferroniobium);
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tantalum
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