ASTM A866-18
(Specification)Standard Specification for Medium Carbon Anti-Friction Bearing Steel
Standard Specification for Medium Carbon Anti-Friction Bearing Steel
ABSTRACT
This specification covers the standard specification for medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. The bearings shall conform to the required chemical composition for carbon, phosphorus, manganese, sulfur, silicon, chromium, molybdenum, vanadium, copper, oxygen and aluminum. Requirement for dimensional tolerances of hot-rolled or hot-rolled and annealed bars, in straight lengths or coils, and cold-finished bars and larger in diameter furnished shall conform to the specified size, shape and tolerances. The grain size of the material shall conform to the required size, otherwise it shall be normalized and retested. Decarburization and surface imperfection shall not exceed the limit in the specified values. Material may be ordered as hot rolled or thermally treated. No hardness limits shall apply for as-hot-rolled materials.
SCOPE
1.1 This specification covers medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings.
1.2 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.
1.3 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.
1.4 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
- 30-Apr-2018
- Technical Committee
- A01 - Steel, Stainless Steel and Related Alloys
- Drafting Committee
- A01.28 - Bearing and Power Transmission Steels
Relations
- Effective Date
- 01-May-2018
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Nov-2015
- Effective Date
- 01-Mar-2014
- Effective Date
- 15-Nov-2012
- Effective Date
- 01-May-2012
- Effective Date
- 01-May-2012
- Effective Date
- 01-Oct-2011
- Effective Date
- 01-Oct-2011
- Effective Date
- 01-Jun-2011
- Effective Date
- 01-Apr-2011
- Effective Date
- 15-Mar-2011
- Effective Date
- 01-Nov-2010
- Effective Date
- 01-Nov-2010
- Effective Date
- 01-Nov-2008
Overview
ASTM A866-18: Standard Specification for Medium Carbon Anti-Friction Bearing Steel establishes requirements for steel materials intended for the production of anti-friction bearings. Issued by ASTM International, this standard covers medium carbon, bearing-quality steel supplied as hot-rolled, hot-rolled and annealed, or cold-finished bars and coils. It details the required chemical composition, size, shape, tolerances, and additional quality specifications essential for bearing steel performance. ASTM A866-18 is developed in accordance with internationally recognized standardization principles and supports reliable, consistent material quality in bearing manufacturing.
Key Topics
- Material Scope: Specifies steel compositions suitable for anti-friction bearing production, such as grades 1030, 1040, 4150, and others, including ISO equivalents.
- Chemical Composition: Defines required concentrations of carbon, phosphorus, manganese, sulfur, silicon, chromium, molybdenum, vanadium, copper, oxygen, and aluminum for different grades.
- Manufacturing Process: Allows for ordering as hot-rolled, thermally treated, straight lengths, or coils.
- Size, Shape, and Tolerances: Outlines dimensional tolerances for hot-rolled, annealed, and cold-finished bars and coils, aligning with specification A29/A29M.
- Surface Quality: Limits on surface imperfections and decarburization to ensure optimal performance in precision components.
- Testing and Inspection: Includes requirements for micro-inclusion assessment, grain size (typically ASTM 5-8), macroetch testing, and product analysis to verify conformity.
- Supplementary Requirements: Optional specifications available by agreement, including titanium analysis, alternate inclusion rating systems, or sulfur levels for improved machinability.
Applications
ASTM A866-18 medium carbon anti-friction bearing steel is essential for:
- Bearing Manufacturing: Ensures the steel used in ball, roller, and needle bearings meets precise mechanical and chemical criteria for fatigue resistance, hardness, and structural integrity.
- Automotive Components: Suitable for high-performance bearings in engines, transmissions, and wheel assemblies requiring reliable anti-friction properties.
- Industrial Machinery: Used in rotating equipment, heavy-duty gearboxes, and electric motors where smooth operation and durability are critical.
- Aerospace and Precision Devices: Applied in high-specification bearings for aerospace parts and equipment demanding superior cleanliness and surface quality.
By adhering to ASTM A866-18, manufacturers can guarantee material consistency, enhance bearing performance, and meet client or regulatory requirements for medium carbon bearing steels.
Related Standards
- ASTM A29/A29M: General requirements for hot-wrought carbon and alloy steel bars, including size and tolerance specifications referenced by ASTM A866-18.
- ASTM A751: Procedures for chemical analysis, supporting verification of heat and product composition.
- ASTM E45: Test methods for inclusion content in steel, essential for micro-cleanliness ratings.
- ASTM E112: Methods for determining average grain size in steel products.
- ASTM E381: Macroetch testing for steel bars, billets, and related products.
- ASTM E1019: Combustion and fusion techniques for determination of carbon, sulfur, nitrogen, and oxygen content.
- ISO 683-17: International standard for ball and roller bearing steels, providing alternative or supporting chemical composition guidelines.
Practical Value
Complying with ASTM A866-18 provides manufacturers with a robust framework for sourcing and evaluating medium carbon steel for anti-friction bearings. The standard's detailed specifications promote:
- Enhanced bearing reliability and longevity
- Greater manufacturing consistency
- Compatibility with global supply chains and international markets
- Streamlined procurement and quality assurance processes
When specifying or purchasing bearing steel, referencing ASTM A866-18 assures customers and stakeholders of adherence to recognized quality and performance benchmarks for anti-friction applications.
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Frequently Asked Questions
ASTM A866-18 is a technical specification published by ASTM International. Its full title is "Standard Specification for Medium Carbon Anti-Friction Bearing Steel". This standard covers: ABSTRACT This specification covers the standard specification for medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. The bearings shall conform to the required chemical composition for carbon, phosphorus, manganese, sulfur, silicon, chromium, molybdenum, vanadium, copper, oxygen and aluminum. Requirement for dimensional tolerances of hot-rolled or hot-rolled and annealed bars, in straight lengths or coils, and cold-finished bars and larger in diameter furnished shall conform to the specified size, shape and tolerances. The grain size of the material shall conform to the required size, otherwise it shall be normalized and retested. Decarburization and surface imperfection shall not exceed the limit in the specified values. Material may be ordered as hot rolled or thermally treated. No hardness limits shall apply for as-hot-rolled materials. SCOPE 1.1 This specification covers medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. 1.2 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order. 1.3 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. 1.4 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.
ABSTRACT This specification covers the standard specification for medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. The bearings shall conform to the required chemical composition for carbon, phosphorus, manganese, sulfur, silicon, chromium, molybdenum, vanadium, copper, oxygen and aluminum. Requirement for dimensional tolerances of hot-rolled or hot-rolled and annealed bars, in straight lengths or coils, and cold-finished bars and larger in diameter furnished shall conform to the specified size, shape and tolerances. The grain size of the material shall conform to the required size, otherwise it shall be normalized and retested. Decarburization and surface imperfection shall not exceed the limit in the specified values. Material may be ordered as hot rolled or thermally treated. No hardness limits shall apply for as-hot-rolled materials. SCOPE 1.1 This specification covers medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. 1.2 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order. 1.3 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. 1.4 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.
ASTM A866-18 is classified under the following ICS (International Classification for Standards) categories: 77.140.10 - Heat-treatable steels. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM A866-18 has the following relationships with other standards: It is inter standard links to ASTM A866-14, ASTM E45-18a(2023), ASTM A29/A29M-15, ASTM A751-14, ASTM E112-12, ASTM A29/A29M-12, ASTM A29/A29M-12e1, ASTM E45-11a, ASTM A29/A29M-11a, ASTM E45-11, ASTM A29/A29M-11, ASTM E1019-11, ASTM E112-10, ASTM E45-10, ASTM E1019-08. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM A866-18 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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: A866 −18
Standard Specification for
Medium Carbon Anti-Friction Bearing Steel
This standard is issued under the fixed designation A866; 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* 2.2 ISO Standard:
ISO 683 Part 17: Ball and Roller Bearing Steels
1.1 This specification covers medium carbon bearing qual-
ity steel to be used in the manufacture of anti-friction bearings.
3. Ordering Information
1.2 Supplementary requirements of an optional nature are
3.1 Orders for material under this specification should
provided and when desired shall be so stated in the order.
include the following information:
1.3 The values stated in inch-pound units are to be regarded 3.1.1 Quantity (weight or pieces),
as standard. The values given in parentheses are mathematical
3.1.2 Grade identification,
conversions to SI units that are provided for information only 3.1.3 ASTM designation and year of issue,
and are not considered standard.
3.1.4 Dimensions, and
3.1.5 Supplementary requirements, if included.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Materials and Manufacture
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- 4.1 Process:
4.1.1 The steel shall be made by a process that is capable of
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. providing a high quality product meeting the requirements of
this specification.
2. Referenced Documents
5. Chemical Composition and Analysis
2.1 ASTM Standards:
5.1 Typical examples of chemical composition are shown in
A29/A29M SpecificationforGeneralRequirementsforSteel
Table 1. Other compositions may be specified.
Bars, Carbon and Alloy, Hot-Wrought
A751 Test Methods, Practices, and Terminology for Chemi-
5.2 An analysis of each heat of steel shall be made by the
cal Analysis of Steel Products
steel manufacturer in accordance withTest Methods, Practices,
E45 Test Methods for Determining the Inclusion Content of
and Terminology A751. The chemical composition thus deter-
Steel
mined shall conform to the requirements specified in Table 1
E112 Test Methods for Determining Average Grain Size
for the ordered grade or to other requirements agreed upon
E381 Method of Macroetch Testing Steel Bars, Billets,
between the manufacturer and the purchaser.
Blooms, and Forgings
5.3 Product analysis may be made by the purchaser in
E1019 Test Methods for Determination of Carbon, Sulfur,
accordance with Test Methods, Practices, and Terminology
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
A751. Permissible variations in product analysis shall be in
Alloys by Various Combustion and Fusion Techniques
accordance with Specification A29/A29M.
E1077 Test Methods for Estimating the Depth of Decarbur-
ization of Steel Specimens
6. Sizes, Shapes, and Dimensional Tolerances
6.1 The physical size and shape of the material shall be
agreed upon between the manufacturer and the purchaser.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
6.2 Dimensional tolerances for hot-rolled or hot-rolled and
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.28 on Bearing and Power Transmission Steels.
annealed bars, in straight lengths or coils, and cold-finished
Current edition approved May 1, 2018. Published May 2018. Originally
bars0.500in.(12.7mm)andlargerindiameterfurnishedunder
approved in 1987. Last previous edition approved in 2014 as A866 – 14. DOI:
10.1520/A0866-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
the ASTM website. Geneva, Switzerland, http://www.iso.org.
*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 19428-2959. United States
A866 − 18
A,B
TABLE 1 Chemical Composition
C D
ISO Name C Mn P (max) S (max) Si Cr Mo V Cu (max) O (max) Al (max)
. . . 1030 0.28 to 0.34 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1040 0.37 to 0.44 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1050 0.48 to 0.55 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1541 0.36 to 0.44 1.35 to 1.65 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1552 0.47 to 0.55 1.20 to 1.50 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 4130 0.28 to 0.33 0.40 to 0.60 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4140 0.38 to 0.43 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4150 0.48 to 0.53 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 5140 0.38 to 0.43 0.70 to 0.95 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 5150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 6150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.80 to 1.10 . . . 0.15 min 0.30 0.0020 0.050
ISO C56E2 0.52 to 0.60 0.60 to 0.90 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 56Mn4 0.52 to 0.60 0.90 to 1.20 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 70Mn4 0.65 to 0.75 0.80 to 1.10 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 43CrMo4 0.40 to 0.46 0.60 to 0.90 0.025 0.015 0.40 max 0.90 to 1.20 0.15 to 0.30 . . . 0.30 0.0020 0.050
A
Elements not quoted shall not be intentionally added to the steel without the agreement of the purchaser.
B
Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specifically approved by the purchaser.
C
Steels listed as ISO meet the requirements of ISO 683, Part 17, Third Edition, Table 3.
D
Oxygen content applies to product analysis and shall be determined in accordance with Test Methods E1019.
thisspecificationshallconformtotherequirementsspecifiedin may be selected. Other methods of sampling shall be as agreed
the latest edition of Specification A29/A29M. upon by manufacturer and purchaser.
7.2.3 For strand cast products, a minimum of six samples
6.3 Dimensional tolerances for cold-finished coils for ball
representing the first, middle, and last portion of the heat cast
and roller material shall be as shown in Table 2.
shall be examined. At least one sample shall be taken from
6.4 Coil tolerances also apply to cold-finished straight
each strand.
lengths under 0.500 in. in diameter.
3 3
7.3 Inclusion Rating—The specimens shall be ⁄8 by ⁄4 in.
(9.5 by 19.1 mm) and shall be taken from an area halfway
7. Quality Tests
between the center and outside of the billet. The polished face
7.1 The supplier shall be held responsible for the quality of
shall be longitudinal to the direction of rolling. The scale used
the material furnished and shall make the necessary tests to
for rating the specimens shall be the Jernkontoret chart
ensure this quality. The supplier shall be required to report on
described in Test Methods E45, Plate I-A. Fields with sizes or
the results of the micro-inclusion rating tests detailed below.
numbers of all types of inclusions intermediate between
Quality tests shown in 7.2 through 7.3 are based upon
configurations shown on the chart shall be classified as the
procedures established in Test Methods E45.
lesser of the rating number. The worst field of each inclusion
7.2 Sampling—Samples taken in accordance with the fol-
type from each specimen shall be recorded as the rating for the
lowing paragraphs shall be obtained from 4 by 4 in. (102 by
specimen. Two thirds of all specimens and at least one from
102 mm) rolled billets or forged sections. Tests may be made
each ingot tested, or from the first, middle, and last portion of
on smaller or larger sections by agreement with the purchaser.
the strands tested, as well as the average of all specimens, shall
Aminimum 3 to 1 reduction of rolled billets or forged sections
not exceed the rating specified in Table 3.
is required for strand cast products.
8. Grain Size
7.2.1 For top poured products, a minimum of six samples
representing the top and bottom of the first, midd
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A866 − 14 A866 − 18
Standard Specification for
Medium Carbon Anti-Friction Bearing Steel
This standard is issued under the fixed designation A866; 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*
1.1 This specification covers medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings.
1.2 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.
1.3 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.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E45 Test Methods for Determining the Inclusion Content of Steel
E112 Test Methods for Determining Average Grain Size
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
E1019 Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by
Various Combustion and Fusion Techniques
E1077 Test Methods for Estimating the Depth of Decarburization of Steel Specimens
2.2 ISO Standard:
ISO 683 Part 17: Ball and Roller Bearing Steels
3. Ordering Information
3.1 Orders for material under this specification should include the following information:
3.1.1 Quantity (weight or pieces),
3.1.2 Grade identification,
3.1.3 ASTM designation and year of issue,
3.1.4 Dimensions, and
3.1.5 Supplementary requirements, if included.
4. Materials and Manufacture
4.1 Process:
4.1.1 The steel shall be made by a process that is capable of providing a high quality product meeting the requirements of this
specification.
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.28
on Bearing and Power Transmission Steels.
Current edition approved Oct. 1, 2014May 1, 2018. Published November 2014May 2018. Originally approved in 1987. Last previous edition approved in 20092014 as
A866 – 09.A866 – 14. DOI: 10.1520/A0866-14.10.1520/A0866-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from International Organization for Standardization (ISO), 1, ch. de la Voie-Creuse, CP 56, CH-1211 Geneva 20,ISO Central Secretariat, BIBC II, Chemin de
Blandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland, http://www.iso.org.
*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 19428-2959. United States
A866 − 18
5. Chemical Composition and Analysis
5.1 Typical examples of chemical composition are shown in Table 1. Other compositions may be specified.
5.2 An analysis of each heat of steel shall be made by the steel manufacturer in accordance with Test Methods, Practices, and
Terminology A751. The chemical composition thus determined shall conform to the requirements specified in Table 1 for the
ordered grade or to other requirements agreed upon between the manufacturer and the purchaser.
5.3 Product analysis may be made by the purchaser in accordance with Test Methods, Practices, and Terminology A751.
Permissible variations in product analysis shall be in accordance with Specification A29/A29M.
6. Sizes, Shapes, and Dimensional Tolerances
6.1 The physical size and shape of the material shall be agreed upon between the manufacturer and the purchaser.
6.2 Dimensional tolerances for hot-rolled or hot-rolled and annealed bars, in straight lengths or coils, and cold-finished bars
0.500 in. (12.7 mm) and larger in diameter furnished under this specification shall conform to the requirements specified in the
latest edition of Specification A29/A29M.
6.3 Dimensional tolerances for cold-finished coils for ball and roller material shall be as shown in Table 2.
6.4 Coil tolerances also apply to cold-finished straight lengths under 0.500 in. in diameter.
7. Quality Tests
7.1 The supplier shall be held responsible for the quality of the material furnished and shall make the necessary tests to ensure
this quality. The supplier shall be required to report on the results of the micro-inclusion rating tests detailed below. Quality tests
shown in 7.2 through 7.3 are based upon procedures established in Test Methods E45.
7.2 Sampling—Samples taken in accordance with the following paragraphs shall be obtained from 4 by 4 in. (102 by 102 mm)
rolled billets or forged sections. Tests may be made on smaller or larger sections by agreement with the purchaser. A minimum
3 to 1 reduction of rolled billets or forged sections is required for strand cast products.
A,B
TABLE 1 Chemical Composition
C D
Number Name C Mn P (max) S (max) Si Cr Mo V Cu (max) O (max) Al (max)
. . . 1030 0.28 to 0.34 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1040 0.37 to 0.44 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1050 0.48 to 0.55 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1541 0.36 to 0.44 1.35 to 1.65 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1552 0.47 to 0.55 1.20 to 1.50 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 4130 0.28 to 0.33 0.40 to 0.60 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4140 0.38 to 0.43 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4150 0.48 to 0.53 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 5140 0.38 to 0.43 0.70 to 0.95 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 5150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 6150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.80 to 1.10 . . . 0.15 min 0.30 0.0020 0.050
B40 C56E2 0.52 to 0.60 0.60 to 0.90 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
B41 56Mn4 0.52 to 0.60 0.90 to 1.20 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
B43 43CrMo4 0.40 to 0.46 0.60 to 0.90 0.025 0.015 0.40 max 0.90 to 1.20 0.15 to 0.30 . . . 0.30 0.0020 0.050
A,B
TABLE 1 Chemical Composition
C D
ISO Name C Mn P (max) S (max) Si Cr Mo V Cu (max) O (max) Al (max)
. . . 1030 0.28 to 0.34 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1040 0.37 to 0.44 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1050 0.48 to 0.55 0.60 to 0.90 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1541 0.36 to 0.44 1.35 to 1.65 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 1552 0.47 to 0.55 1.20 to 1.50 0.025 0.025 0.15 to 0.35 . . . . . . . . . 0.30 0.0020 0.050
. . . 4130 0.28 to 0.33 0.40 to 0.60 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4140 0.38 to 0.43 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 4150 0.48 to 0.53 0.75 to 1.00 0.025 0.025 0.15 to 0.35 0.80 to 1.10 0.15 to 0.25 . . . 0.30 0.0020 0.050
. . . 5140 0.38 to 0.43 0.70 to 0.95 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 5150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.70 to 0.90 . . . . . . 0.30 0.0020 0.050
. . . 6150 0.48 to 0.53 0.70 to 0.90 0.025 0.025 0.15 to 0.35 0.80 to 1.10 . . . 0.15 min 0.30 0.0020 0.050
ISO C56E2 0.52 to 0.60 0.60 to 0.90 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 56Mn4 0.52 to 0.60 0.90 to 1.20 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 70Mn4 0.65 to 0.75 0.80 to 1.10 0.025 0.015 0.40 max . . . . . . . . . 0.30 0.0020 0.050
ISO 43CrMo4 0.40 to 0.46 0.60 to 0.90 0.025 0.015 0.40 max 0.90 to 1.20 0.15 to 0.30 . . . 0.30 0.0020 0.050
A
Elements not quoted shall not be intentionally added to the steel without the agreement of the purchaser.
B
Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specifically approved by the purchaser.
C
Steels B40, B41, and B43 listed as ISO meet the requirements of ISO 683, Part 17, SecondThird Edition, Table 3.
D
Oxygen content applies to product analysis and shall be determined in accordance with Test Methods E1019.
A866 − 18
TABLE 2 Dimensional Tolerances for Cold-Finished Coils
Size, in. (mm) Total Tolerance, in. (mm)
Through 0.096 (2.44) 0.002 (0.05)
Over 0.096 (2.44) to 0.270 (6.86), incl 0.003 (0.08)
Over 0.270 (6.86) to 0.750 (19.1), incl 0.004 (0.10)
7.2.1 For top poured products, a minimum of six samples representing the top and bottom of the first, middle, and last usable
ingots shall be examined.
7.2.2 For bottom poured products, a minimum of six samples shall be examined and they shall represent the top and bottom
of three ingots. One ingot shall be taken at ran
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