ASTM A495-06(2020)

Standard Specification for Calcium-Silicon Alloys

ABSTRACT
This specification covers a standard grade of calcium-silicon, a standard grade of calcium-manganese-silicon, a standard grade of calcium-silicon-barium and a standard grade of ferro-calcium-silicon. The material shall conform to the requirements as to chemical composition specified.
SCOPE
1.1 This specification covers a standard grade of calcium-silicon, a standard grade of calcium-manganese-silicon, a standard grade of calcium-silicon-barium, and a standard grade of ferro-calcium-silicon.  
1.2 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: 29-Feb-2020
• ICS: 77.120.99 - Other non-ferrous metals and their alloys
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Replaces: ASTM A495-06(2015) - Standard Specification for Calcium-Silicon Alloys
• 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 A1025/A1025M-10 - Standard Specification for Ferroalloys, General Requirements
• Effective Date: 01-Oct-2010
• Referred By: ASTM A1025/A1025M-10(2020) - Standard Specification for Ferroalloys and Other Alloying Materials, General Requirements
• Effective Date: 01-Mar-2020

Overview

ASTM A495-06(2020) is the international standard specification developed by ASTM for various calcium-silicon alloys, which are essential ferroalloy materials used primarily in the steel industry. This standard covers the requirements for the chemical composition and sizing of standard grades such as calcium-silicon, calcium-manganese-silicon, calcium-silicon-barium, and ferro-calcium-silicon, ensuring consistency and quality for manufacturers and end-users worldwide.

This specification aligns with internationally recognized principles for standardization, as set out by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Compliance with ASTM A495 guarantees that ferroalloys meet strict chemical and physical requirements, supporting efficient steel production and other industrial applications.

Key Topics

• Standard Grades Covered
  • Calcium-silicon (CaSi)
  • Calcium-manganese-silicon (CaSiMn)
  • Calcium-silicon-barium (CaSiBa)
  • Ferro-calcium-silicon (FeCaSi)
• Chemical Composition Requirements
  • Specifies minimum and maximum percentages for key elements such as calcium, silicon, manganese, barium, and iron for each grade.
  • Contains supplemental chemical limits for elements like carbon, sulfur, phosphorus, titanium, and aluminum to ensure alloy purity.
• Physical Appearance and Size
  • Defines standard sizes and friability ratings for these alloys.
  • Allows for various product sizes ranging from large lumps to fine mesh, addressing different usage needs in steelmaking and foundry operations.
• Quality Assurance
  • Outlines requirements for chemical composition certification with each shipment.
  • Sampling procedures may be mutually agreed upon by manufacturer and purchaser.

Applications

Calcium-silicon alloys are widely used in the steel industry and related metallurgical fields. Key areas of application include:

• Steel Deoxidation and Desulfurization:
  • Calcium-silicon and related alloys are added to molten steel to remove oxygen and sulfur impurities, improving steel quality and performance.
• Alloying Additions:
  • Enhances mechanical properties and workability of steel and cast iron by modifying chemical composition.
• Foundry Operations:
  • Used in the production of ductile and cast irons, contributing to improved machinability and strength.
• Specialty Applications:
  • Calcium-silicon alloys play a role in the manufacture of certain non-ferrous alloys and advanced materials.

The various grades and sizes specified by ASTM A495 allow end-users to select the optimal alloy for specific metallurgical processes, resulting in improved production efficiency and product quality.

Related Standards

To ensure holistic compliance and integration across supply chains, ASTM A495 references several other key standards, including:

• ASTM A1025/A1025M - Specification for Ferroalloys and Other Alloying Materials, General Requirements
• International Standards developed in line with WTO TBT Committee guidelines for global trade

These standards collectively help underpin quality control, product traceability, and interoperability in the global steel and ferroalloys industry.

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Keywords: ASTM A495, calcium-silicon alloys specification, ferroalloy standards, calcium-manganese-silicon, calcium-silicon-barium, ferro-calcium-silicon, steel deoxidation, alloy chemical composition, ASTM International, metallurgical industry standards.

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: A495 −06 (Reapproved 2020)
Standard Specification for
Calcium-Silicon Alloys
This standard is issued under the fixed designation A495; 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 any supplementary requirements that are indicated in the
purchase order. Failure to comply with the general require-
1.1 This specification covers a standard grade of calcium-
ments of Specification A1025/A1025M constitutes nonconfor-
silicon, a standard grade of calcium-manganese-silicon, a
mance with this specification. In case of conflict between the
standard grade of calcium-silicon-barium, and a standard grade
requirements of this specification and Specification A1025/
of ferro-calcium-silicon.
A1025M, this specification shall prevail.
1.2 This international standard was developed in accor-
4. Chemical Requirements
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.1 The material shall conform to the requirements as to
Development of International Standards, Guides and Recom-
chemical composition specified in Tables 1 and 2. The manu-
mendations issued by the World Trade Organization Technical
facturer shall furnish an analysis of each shipment showing the
Barriers to Trade (TBT) Committee.
percentage of each element specified in Table 1.
4.2 FortheelementsspecifiedinTable2,ananalysisofeach
2. Referenced Documents
lot is not required. Upon request of the purchaser, the manu-
2.1 ASTM Standards:
facturer shall supply the results of an analysis for the elements
A1025/A1025M Specification for Ferroalloys and Other Al-
in Table 2 on a cumulative basis over a period mutually agreed
loying Materials, General Requirements
upon by the manufacturer and the purchaser.
3. General Conditions for Delivery
5. Size
3.1 Material furnished to this specification shall conform to
5.1 Calcium-silicon alloys are available in sizes as listed in
the requirements of Specification A1025/A1025M, including
Table 3.
5.2 The sizes listed in Table 3 are typical as shipped from
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
the manufacturer’s plant. These alloys are friable and some
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
attrition can be expected in transit, storage, and handling. The
A01.18 on Castings.
friability rating for these alloys is Code No. 6, the most friable
Current edition approved March 1, 2020. Published March 2020. Originally
approved in 1963. Last previous edition approved in 2015 as A495 – 06 (2015). rating on the scale.
DOI: 10.1520/A0495-06R20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Sampling
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 Methods of sampling may be agreed upon by the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. manufacturer and the purchaser.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A495 − 06 (2020)
TABLE 1 Chemical Requirements
Composition, %
Element
CaSi CaSiMn CaSiBa FeCaSi
Calcium 28.0 to 32.0 16.0 to 20.0 14
...