ASTM B427-21

Standard Specification for Gear Bronze Alloy Castings

ABSTRACT
This specification establishes requirements for gear bronze alloy castings with Copper Alloy No. C90800, C91700, C90700, C91600, and C92900. The castings may be furnished as one of three types: static chill, centrifugal chill, or sand cast. The alloys shall be subject to tensile strength, yield strength, elongation, and Brinell hardness tests. The Brinell readings shall be taken on the grip end of the tension test bar as described in the specification.
SCOPE
1.1 This specification2 establishes requirements for alloys whose copper alloy numbers and compositions are shown in Table 1. The castings may be furnished as one of three types: static chill, centrifugal chill, or sand cast.  
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 standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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: 31-Mar-2021
• ICS: 77.150.30 - Copper products
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.05 - Castings and Ingots for Remelting

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:B427 −21
Standard Specification for
1
Gear Bronze Alloy Castings
This standard is issued under the fixed designation B427; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* B950 Guide for Editorial Procedures and Form of Product
2 Specifications for Copper and Copper Alloys
1.1 This specification establishes requirements for alloys
E8/E8M Test Methods for Tension Testing of Metallic Ma-
whose copper alloy numbers and compositions are shown in
terials
Table 1. The castings may be furnished as one of three types:
E10 Test Method for Brinell Hardness of Metallic Materials
static chill, centrifugal chill, or sand cast.
E255 Practice for Sampling Copper and Copper Alloys for
1.2 The values stated in inch-pound units are to be regarded
the Determination of Chemical Composition
as standard. The values given in parentheses are mathematical
E527 Practice for Numbering Metals and Alloys in the
conversions to SI units that are provided for information only
Unified Numbering System (UNS)
and are not considered standard.
3. General Requirements
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 The following sections of Specification B824 constitute
responsibility of the user of this standard to establish appro-
a part of this specification.
priate safety, health, and environmental practices and deter-
3.1.1 Terminology (Section 4)
mine the applicability of regulatory limitations prior to use.
3.1.2 Materials and Manufacture
1.4 This international standard was developed in accor-
3.1.3 Sampling
dance with internationally recognized principles on standard-
3.1.4 Number of Tests and Retests
ization established in the Decision on Principles for the
3.1.5 Specimen Preparation
Development of International Standards, Guides and Recom-
3.1.6 Certification
mendations issued by the World Trade Organization Technical
3.1.7 Test Reports
Barriers to Trade (TBT) Committee.
3.2 In addition, when a section with a title identical to that
referenced in 3.1, above, appears in this specification, it
2. Referenced Documents
contains additional requirements which supplement those ap-
3
2.1 ASTM Standards:
pearing in Terminology B846.
B208 Practice for Preparing Tension Test Specimens for
Copper Alloy Sand, Permanent Mold, Centrifugal, and
4. Terminology
Continuous Castings
4.1 For definitions of terms related to copper and copper
B824 Specification for General Requirements for Copper
alloys, refer to Terminology B846.
Alloy Castings
B846 Terminology for Copper and Copper Alloys
5. Ordering Information
5.1 Include the following information in orders for product:
1
This specification is under the jurisdiction ofASTM Committee B05 on Copper
5.1.1 ASTM designation and year of issue (for example,
and Copper Alloys and is the direct responsibility of Subcommittee B05.05 on
B427 – 09);
Castings and Ingots for Remelting.
5.1.2 Copper Alloy UNS No. (for example, C90800);
Current edition approved April 1, 2021. Published April 2021. Originally
approved in 1965. Last previous edition approved in 2015 as B427 – 09 (2015).
5.1.3 Dimensions: inside diameter, outside diameter,
DOI: 10.1520/B0427-21.
thickness, and width;
2
The UNS system for copper and copper alloys (see Practice E527) is a simple
5.1.4 Form: cross-section, such as tube, round, hexagon,
expansion of the former standard designation system accomplished by the addition
octagon, square, or rectangle;
of a prefix “C” and a suffix “00.” The suffix can be used to accommodate
composition variations of the base alloy.
5.1.5 Tolerances, agreed upon with producer and consumer
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(Section 8);
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.1.6 Length (including length tolerance if other than mill
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. lengths);
*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
1

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B427−21
TABLE 1 Chemical Requirements
Composition, max % (Unless Shown as a Range or Minimum) Copper Alloy UNS No.
Element
A A A A A
C90700 C
...

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: B427 − 09 (Reapproved 2015) B427 − 21
Standard Specification for
1
Gear Bronze Alloy Castings
This standard is issued under the fixed designation B427; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 This specification establishes requirements for alloys whose copper alloy numbers and nominal compositions are shown in
Table 1. The castings may be furnished as one of three types: static chill, centrifugal chill, or sand cast.
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 standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
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
3
2.1 ASTM Standards:
B208 Practice for Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and Continuous
Castings
B824 Specification for General Requirements for Copper Alloy Castings
B846 Terminology for Copper and Copper Alloys
B950 Guide for Editorial Procedures and Form of Product Specifications for Copper and Copper Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
E10 Test Method for Brinell Hardness of Metallic Materials
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. General Requirements
3.1 The following sections of Specification B824 constitute a part of this specification.
1
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.05 on Castings
and Ingots for Remelting.
Current edition approved May 1, 2015April 1, 2021. Published June 2015April 2021. Originally approved in 1965. Last previous edition approved in 20092015 as
B427 – 09.B427 – 09 (2015). DOI: 10.1520/B0427-09R15.10.1520/B0427-21.
2
The UNS system for copper and copper alloys (see Practice E527) is a simple expansion of the former standard designation system accomplished by the addition of a
prefix “C” and a suffix “00.” The suffix can be used to accommodate composition variations of the base alloy.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
*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
1

---------------------- Page: 1 ----------------------
B427 − 21
TABLE 21 Chemical Requirements
Composition, max % (Unless Shown as a Range or Minimum) Copper Alloy UNS No.
Element
A A A A A A
C90700 C90800 C91700C91600 C90700 C91600C91700 C92900
B B B B B
Copper 85.0–89.0 84.0–87.0 88.0–90.0 86.0–89.0 82.0–86.0
B B B B B
Copper 88.0–90.0 85.0–89.0 86.0–89.0 84.0–87.0 82.0–86.0
Tin 11.0–13.0 11.3–12.5 10.0–12.0 9.7–10.8 9.0–11.0
Tin 10.0–12.0 11.0–13.0 9.7–10.8 11.3–12.5 9.0–11.0
Lead 0.25 0.25 0.50 0.25 2.0–3.2
Lead 0.50 0.25 0.25 0.25 2.0–3.2
Zinc 0.25 0.25 0.50 0.25 0.25
Zinc 0.50 0.25 0.25 0.25 0.25
Iron 0.15 0.20 0.15 0.20 0.20
Iron 0.15 0.15 0.20 0.20 0.20
Antimony 0.20 0.20 0.20 0.20 0.25
Nickel (incl. cobalt) 0.50 1.2–2.0 0.50 1.2–2.0 2.8–4.0
C C C C C
Nickel (incl. cobalt) 0.50 0.50 1.2–2.0 1.2–2.0 2.8–4.0
Sulfur 0.05 0.05 0.05 0.05 0.05
Phosphorus 0.30 0.30 0.30 0.30 0.50
Aluminum 0.005 0.005 0.005 0.005 0.005
Silicon 0.005 0.005 0.005 0.005 0.005
A
Ingot fo
...