ASTM B372-22

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: B372 − 17 B372 − 22
Standard Specification for
Seamless Copper and Copper-Alloy Rectangular Waveguide
Tube
This standard is issued under the fixed designation B372; 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*
1.1 This specification establishes the requirements for seamless copper and copper-alloy rectangular tube intended for use as
transmission lines in electronic equipment. Five types of material are specified having the following nominal compositions:
Copper or
Copper Alloy Previously Nominal Composition, %
UNS No. Used Designation Copper Zinc Phosphorus
A B
C10100 Copper, Type OFE 99.99 . .
A B
C10200 Copper, Type OF 99.95 . .
A B
C10300 Copper, Type OFXLP 99.95 . 0.003
A B
C12000 Copper, Type DLP 99.90 . 0.008
C22000 Commercial 90 10 .
bronze, 90 %
A
Types OF, OFE, OFXLP, and DLP are described in Classification B224.
B
Minimum copper percentage.
1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units whichthat are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test method(s) described in this specification.
1.3.1 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.
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.04 on Pipe and
Tube.
Current edition approved Oct. 1, 2017May 1, 2022. Published October 2017May 2022. Originally approved in 1961. Last previous edition approved in 20122017 as
B372 – 12a.B372 – 17. DOI: 10.1520/B0372-17.10.1520/B0372-22.
The UNS system for copper and copper alloys 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.
*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
B372 − 22
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein:
2.2 ASTM Standards:
B170 Specification for Oxygen-Free Electrolytic Copper—Refinery Shapes
B193 Test Method for Resistivity of Electrical Conductor Materials
B224 Classification of Coppers
B428 Test Method for Angle of Twist in Rectangular and Square Copper and Copper Alloy Tube
B577 Test Methods for Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper
B846 Terminology for Copper and Copper Alloys
E18 Test Methods for Rockwell Hardness of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E53 Test Method for Determination of Copper in Unalloyed Copper by Gravimetry (Withdrawn 2022)
E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods) (Withdrawn 2010)
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E478 Test Methods for Chemical Analysis of Copper Alloys
2.3 Other Document:
ANSI B46.1 Surface Roughness, Waviness, and Lay
3. Terminology
3.1 For definitions of terms related to copper and copper alloys, refer to Terminology B846.
4. Ordering Information
4.1 Include the following specified choices when placing orders for products under this specification, as applicable:
4.1.1 ASTM designation and year of issue,issue;
4.1.2 Copper or copper alloy UNS No. designation,designation;
4.1.3 Outer and inner rectangular dimensions, dimensional tolerances (Section 10),);
4.1.4 Length (10.6),); and
4.1.5 Total length or number of pieces of each size,size.
4.2 The following options are available but may not be included unless specified and, when required, shall be specified at the time
of placing of the order when required:the order:
4.2.1 Rockwell (Section (8.1),
4.2.2 Electrical resistivity test (Section 7),
4.2.3 Embrittlement test (Section (9.2),
4.2.4 Special finish (Section (11.2),
4.2.5 Heat Identification (Section (13.1.1.412.2.6),
4.2.6 Certification (Section 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.
The last approved version of this historical standard is referenced on www.astm.org.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.
B372 − 22
4.2.7 Mill Test Report (Section 19), and
4.2.8 Special packing (Section 20).
5. Materials and Manufacture
5.1 Materials:
5.1.1 The material of manufacture shall be of such purity and soundness as to be suitable for processing into the products
prescribed herein.
5.1.2 When specified in the contract or purchase order that heat identification or traceability is required, the purchaser shall specify
the details desired.
NOTE 1—Due to the discontinuous nature of the processing of castings into wrought products, it is not always practical to identify a specific casting
analysis with a specific quantity of finished material.
5.2 Manufacture:
5.2.1 The product shall be manufactured by such hot working, cold-working and annealing process as to produce a uniform
wrought structure in the finished product.
5.2.2 The product shall be hot or cold worked to the finished size, and subsequently annealed when required, to meet the temper
properties.
6. Chemical Composition
6.1 The material shall conform to the chemical composition requirements in Table 1 for the copper or copper alloy UNS No.
designation specified in the ordering information.
6.2 These composition limits do not preclude the presence of other elements. By agreement between the manufacturer and
purchaser, limits may be established and analysis required for unnamed elements.
6.3 For alloys in which zinc is listed as “remainder,” either copper or zinc may be taken as the difference between the sum of
results of all other elements determined and 100 %. When all elements for C22000 in Table 1 are determined, the sum of the results
shall be 99.8 % minimum.
TABLE 1 Chemical Requirements
Composition, %
Copper Alloy
Copper UNS Nos.
Element
UNS No.
A B
C10100 C10200 C10300 C12000
C22000
C C
Copper 99.99 min 99.95 . 99.90 min 89.0–91.0
min
C
Copper, . . 99.95 . .
min
+ phosphorus
Phosphorus 0.0003 . 0.001– 0.004– .
max 0.005 0.012
Zinc 0.0001 . . . remainder
max
Lead, max 0.0005 . . . 0.05
Iron, max 0.0010 . . . 0.05
A
The following additional impurity maximum limits shall apply: As 0.0005%, Sb
0.0004%, Te 0.0002%, O 0.0005%, Bi 0.0001%, Cd 0.0001%, Mn 0.00005%, Ni
0.0010%, Se 0.0003%, Ag 0.0025%, S 0.0015% and Sn 0.0002%.
B
Oxygen in C10200 shall be 0.0010 % max.
C
Silver counting as copper.
B372 − 22
7. Physical Property Requirements
7.1 Electrical Resistivity Requirement:
7.1.1 When specified in the contract or purchase order, the product furnished shall conform to the electrical mass resistivity
requirements prescribed in Table 2, when tested in accordance with Test Method B193.
NOTE 1—The International Annealed Copper Standard electrical conductivity equivalents are as follows:
Electrical Resistivity, Conductivity,
Ω·g/m %
0.15176 101.00
0.15328 100.00
0.15585 98.35
0.15614 98.16
0.15737 97.40
0.15940 96.16
0.17031 90
0.17418 88
8. Mechanical Property Requirements
8.1 Rockwell Hardness Requirements:
8.1.1 When specified in the contract or purchase order, the product shall conform to the Rockwell hardness requirement prescribed
in Table 3, when tested in accordance with Test Methods E18.
9. Performance Requirements
9.1 Microscopical Examination:
9.1.1 Samples of Copper UNS Nos. C10100, C10200, C10300, and C12000 shall be free of cuprous oxide as determined by
Procedure A of Test Methods B577. In case of a dispute, a referee method in accordance with Procedure C of Test Methods B577
shall be used.
TABLE 2 Electrical Resistivity Requirements for Copper UNS
Nos. C10100, C10200, C10300, and C12000
Alloys Electrical Resistivity max. Ω·g/m
C10100 0.15585
C10200 0.15737
C10300 0.15940
C12000 0.17418
B372 − 22
TABLE 3 Hardness Requirements
Rockwell Hardness,
Copper or Copper Alloy UNS No.
A
30T Scale
C10100 30 min
C10200 30 min
C10300 30 min
C12000 30 min
C22000 43 to 66
A
The tube shall be split along the center line of its narrow side, and Rockwell
hardness readings then taken on its inner surface.
9.2 Hydrogen Embrittlement Test:
9.2.1 Samples of Copper UNS Nos. C10100, C10200, C10300, and C12000 shall be capable of passing the embrittlement test of
Procedure B of Test Methods B577. The actual performance of this test is not mandatory under the terms of this specification unless
definitely specified in the ordering information. In case of a dispute, a referee method in accordance with Procedure C shall be
employed.
10. Dimensions and Permissible Variations
10.1 General:
10.1.1 The standard method of specifying, ordering, and measuring rectangular waveguide tube shall be major by minor outer
dimension and major by minor inner dimension.
10.1.2 All cross-sectional measurements shall be made at the corners at a point at least ⁄2 in. (12.7 mm) from the ends.
10.1.3 For the purpose of determining conformance with the dimensional requirements prescribed in this specification, any
measured value outside the specified limiting values for any dimension may be cause for rejection.
10.2 Dimensional Tolerances:
10.2.1 Standard dimensions and tolerances of waveguide tube shall be as specified in Table 4.
TABLE 4 Dimensional Tolerances
Outer Dimensions, in. (mm) Inner Dimensions, in. (mm)
Nominal Wall
Tolerance,
Major Minor Major Minor Tolerance, plus and
Thickness, in. (mm)
plus and
Dimensions Dimensions Dimensions Dimensions minus
minus
0.420 (10.7) 0.250 (6.35) 0.003 (0.076) 0.340 (8.64) 0.170 (4.32) 0.002 (0.051) 0.040 (1.02)
0.500 (12.7) 0.250 (6.35) 0.003 (0.076) 0.420 (10.7) 0.170 (4.32) 0.002 (0.051) 0.040 (1.02)
0.590 (15.0) 0.335 (8.51) 0.003 (0.076) 0.510 (13.0) 0.255 (6.48) 0.002 (0.051) 0.040 (1.02)
0.702 (17.8) 0.391 (9.93) 0.003 (0.076) 0.622 (15.8) 0.311 (7.90) 0.002 (0.051) 0.040 (1.02)
0.850 (21.6) 0.475 (12.1) 0.003 (0.076) 0.750 (19.0) 0.375 (9.52) 0.003 (0.076) 0.050 (1.27)
1.000 (25.4) 0.500 (12.7) 0.004 (0.10) 0.900 (22.9) 0.400 (10.2) 0.004 (0.010) 0.050 (1.27)
1.250 (31.8) 0.625 (15.9) 0.004 (0.10) 1.122 (28.5) 0.497 (12.6) 0.004 (0.10) 0.064 (1.63)
1.500 (38.1) 0.750 (19.0) 0.004 (0.10) 1.372 (34.8) 0.622 (15.8) 0.004 (0.10) 0.064 (1.63)
1.718 (43.6) 0.923 (23.4) 0.005 (0.13) 1.590 (40.4) 0.795 (20.2) 0.005 (0.13) 0.064 (1.63)
2.000 (50.8) 1.000 (25.4) 0.005 (0.13) 1.872 (47.5) 0.872 (22.1) 0.005 (0.13) 0.064 (1.63)
2.418 (61.4) 1.273 (32.3) 0.006 (0.15) 2.290 (58.2) 1.145 (29.1) 0.006 (0.15) 0.064 (1.63)
3.000 (76.2) 1.500 (38.1) 0.006 (0.15) 2.840 (72.1) 1.340 (34.0) 0.006 (0.15) 0.080 (2.03)
3.560 (90.4) 1.860 (47.2) 0.006 (0.15) 3.400 (86.4) 1.700 (43.2) 0.006 (0.15) 0.080 (2.03)
4.460 (113) 2.310 (58.7) 0.008 (0.20) 4.300 (109) 2.150 (54.6) 0.008 (0.20) 0.080 (2.03)
5.260 (134) 2.710 (68.8) 0.008 (0.20) 5.100 (130) 2.550 (64.8) 0.008 (0.20) 0.080 (2.03)
6.660 (169) 3.410 (86.6) 0.008 (0.20) 6.500 (165) 3.250 (82.6) 0.008 (0.20) 0.080 (2.03)
B372 − 22
10.2.2 Other dimensions and tolerances shall be subject to agreement between the manufacturer or supplier and the purchaser.
10.3 Corner Radii—Outer corner radii shall be 0.015 in. (0.381 mm) min and 0.032 in. (0.813 mm) max. Maximum inner corner
radii shall be as specified in Table 5.
10.4 Eccentricity—The maximum allowable eccentricity, defined as one-half the difference between the maximum and minimum
opposite wall thicknesses as measured at any cross section perpendicular to the longitudinal axis, shall be in accordance with Table
6.
10.5 Rectangularity—The adjoining faces of the tube shall be as square in relation to each other as the best mill practice will
permit.
10.6 Length—Unless otherwise specified, waveguide tube shall be furnished in 12-ft (3.66-m)12 ft (3.66 m) standard (stock)
straight lengths with ends. The shortest permissible length of the ends shall not be less than 60 % of the nominal length (specific
and stock), and the maximum permissible weight of ends shall not exceed 25 % of the lot weight. Waveguide tube, ordered to
specific or stock lengths, with or without ends, shall conform to the tolerances prescribed in Table 7.
10.7 Squareness of Cut—The departure from the squareness of the end of any tube shall not exceed 0.010 in. (0.25 mm) for tube
up to ⁄8-in. (15.9-mm) in. (15.9 mm) dimension, inclusive, across the measured section, and 0.016 in./in. (0.41 mm/mm) of
distance between parallel surfaces for tube over ⁄8-in. in. dimension across the measured section.
10.8 Straightness—The maximum curvature (depth of arc) measured along any 2-ft (0.610-m)2 ft (0.610 m) portion of the total
length shall not exceed 0.010 in. (0.25 mm) edgewise and 0.020 in. (0.51 mm) flatwise on the concave external surfaces. The tube
shall be so positioned during measurement that gravity will not tend to increase the amount of bow. The edgewise and flatwise
bow shall be determined by using a suitable straightedge.
10.9 Twist—The maximum twist about the longitudinal axis of the finished tube shall not exceed 1°/ft of length on the face of any
surface, inside or outside. Determination of twist shall be in accordance with Test Method B428.
10.10 Surface Roughness—The average interior surface roughness of the finished tube, in accordance with ANSI B46.1, shall not
6 6
exceed 32 μin. A.A. for tube up to 4 in. (102 mm) major ID and 64 μin. A.A. for tube whose major ID is 4 in. or over.
11. Workmanship, Finish, and Appearance
11.1 The product shall be free of defects, but blemishes of a nature that do not interfere with the intended application are
acceptable. The finished tube shall be uniform in composition and wall thickness, straight and smooth from end to end, and shall
be free of internal or external mechanical imperfections in accordance with good commercial practice. In addition, the interior
surface of the tube shall be free of burrs, plug marks, chatter marks, dirt, grease, scale, and splinters. Scratches not more than
0.001-in. (0.025-mm)0.001 in. (0.025 mm) deep, as measured metallographically, will be permitted in the longitudinal direction of
the interior surfaces for tubes 0.622 in. (15.8 mm) by 0.311 in. (7.90 mm) and larger. For tubes smaller than 0.6220.622 in. by 0.311
...