ASTM B129-17 - 1.4.2017
 
Significance and Use

15.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.

Property

Rounded Unit for Observed or Calculated Value

 

 

Chemical Composition

Nearest unit in the last right-hand significant digit used in expressing  the limiting value

Grain size:

 

 Under 0.060 mm

Nearest multiple of 0.005 mm

 0.060 mm and over

Nearest 0.01 mm

 
1. Scope

1.1 This specification establishes the requirements for annealed cartridge brass cups produced of Copper Alloy UNS No. C26000 for processing into cartridge cases of the following types:

1.1.1 Type I, for small arms cartridge case cups, and

1.1.2 Type II, for artillery cartridge case cups.

1.2 Units—The values stated in inch-pound units are to be regarded as standard, except for grain size, which is given in SI units. The values given in parentheses are mathematical conversions to SI units, which 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.

 
2. Referenced Documents

B601-18a

Standard Classification for Temper Designations for Copper and Copper Alloys´Wrought and Cast (Includes all amendments and changes 10/24/2018).

B846-19a

Standard Terminology for Copper and Copper Alloys (Includes all amendments and changes 8/8/2019).

E3-11(2017)

Standard Guide for Preparation of Metallographic Specimens

E29-22

Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

E255-23

Standard Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition

E112-13(2021)

Standard Test Methods for Determining Average Grain Size

E478-08(2017)

Standard Test Methods for Chemical Analysis of Copper Alloys