ASTM A550-16(2021)

Standard Specification for Ferrocolumbium (Ferroniobium)

ABSTRACT
This specification covers three grades of ferrocolumbium, designated low-alloy steel grade, alloy and stainless steel grade, and high-purity grade. The material shall conform to the requirements as to chemical composition. Also, the ferrocolumbium shall be available in the sizes and tolerances specified.
SCOPE
1.1 This specification covers three grades of Ferrocolumbium (ferroniobium), designated Low-Alloy Steel Grade, Alloy and 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 mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 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.

General Information

• Status: Published
• Publication Date: 28-Feb-2021
• ICS: 77.100 - Ferroalloys
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Refers: ASTM A1025/A1025M-10(2020) - Standard Specification for Ferroalloys and Other Alloying Materials, General Requirements
• Effective Date: 01-Mar-2020
• Refers: ASTM A1025/A1025M-10(2015) - Standard Specification for Ferroalloys and Other Alloying Materials, General Requirements
• Effective Date: 01-Nov-2015
• Refers: ASTM E11-13 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
• Effective Date: 01-Oct-2013
• Refers: ASTM A1025/A1025M-10 - Standard Specification for Ferroalloys, General Requirements
• Effective Date: 01-Oct-2010
• Refers: ASTM E11-09e1 - Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves
• Effective Date: 01-May-2009
• Refers: ASTM E11-04 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
• Effective Date: 01-May-2004
• Refers: ASTM E11-95 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
• Effective Date: 10-May-2001
• Refers: ASTM E11-01 - Standard Specification for Wire Cloth and Sieves for Testing Purposes
• Effective Date: 10-May-2001

Overview

ASTM A550-16(2021): Standard Specification for Ferrocolumbium (Ferroniobium) defines the requirements for three grades of ferrocolumbium, also known as ferroniobium, which is a key ferroalloy used to introduce niobium (columbium) into steel. Developed by ASTM International, this standard supports quality and consistency in material supplied for steelmaking, ensuring the alloy meets specific chemical composition and sizing tolerances. Adherence to this specification is vital for steel producers and suppliers seeking compliance with recognized international best practices and the World Trade Organization Technical Barriers to Trade (TBT) principles.

Key Topics

• Grades of Ferrocolumbium

  • Low-Alloy Steel Grade
  • Alloy and Stainless Steel Grade
  • High-Purity Grade

• Chemical Composition
  Each grade must meet defined chemical limits for key elements, particularly niobium, tantalum, carbon, manganese, silicon, aluminum, tin, phosphorus, and sulfur. Supplemental elements, including chromium, tungsten, titanium, lead, and cobalt, are also controlled within maximum permissible values.

• Sizing and Tolerances
  Material is supplied in standard size ranges (e.g., 2-inch by down, 20 mesh by down) with specific retention limits on designated test sieves, ensuring suitability for various steelmaking processes.

• Testing and Certification
  Suppliers must provide chemical analysis for each shipment, and, upon request, can deliver additional analytical data for supplementary elements on a cumulative basis as agreed with purchasers.

• International Compliance
  This standard was developed according to globally recognized standardization principles established by the WTO TBT Committee.

Applications

Ferrocolumbium (Ferroniobium) is crucial for the steel industry, especially in the production of:

• Low-alloy and high-strength steels where niobium significantly improves mechanical properties, weldability, and resistance to corrosion.
• Stainless steel manufacturing, where controlled chemical composition ensures product integrity for demanding environments.
• High-purity applications, such as in the aerospace, automotive, or energy sectors, where trace elements must be tightly regulated for advanced performance.

By specifying grades and chemical compositions, ASTM A550-16(2021) ensures that ferrocolumbium products are compatible with diverse steel grades and processing requirements, supporting reliable sourcing and product performance worldwide.

Related Standards

• ASTM A1025/A1025M – General Requirements for Ferroalloys and Other Alloying Materials: Provides baseline requirements referenced by ASTM A550.
• ASTM E11 – Specification for Woven Wire Test Sieve Cloth and Test Sieves: Defines the sieves used for sizing tolerances in ferrocolumbium shipments.

Other common related standards include:

• Steel and steel alloys composition standards
• Guidelines for alloying element addition in steel production

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Keywords: ferrocolumbium, ferroniobium, ASTM A550, niobium alloy, steel alloying, chemical composition, sizing tolerance, ferroalloys, stainless steel, high-purity grade, ASTM International, alloy standards.

By conforming to ASTM A550-16(2021), suppliers and manufacturers ensure consistent product quality, international compatibility, and reliable performance in steelmaking processes.

Standards Content (Sample)

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 [e-mail]. 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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