ASTM B171 Specification

This specification establishes the requirements for copper-alloy plate, sheet, and circles cut from plate and sheet for pressure vessels, condensers, and heat exchangers.The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

Chemical Composition

Copper Alloy UNS No.A Composition, % max (Unless Shown as a Range)
Copper, incl Silver Tin Nickel, incl Cobalt Manganese, max Lead Iron Zinc Aluminum Chromium Other Named Elements
C36500 58.0-61.0 0.25 ... ... 0.25-0.7 0.15 remainder ... ... ...
C44300 70.0-73.0 0.8-1.2 ... ... 0.07 0.06 remainder ... ... 0.02-0.06 As
C44400 70.0-73.0 0.8-1.2 ... ... 0.07 0.06 remainder ... ... 0.02-0.10 Sb
C44500 70.0-73.0 0.8-1.2 ... ... 0.07 0.06 remainder ... ... 0.02-0.10 p
C46400 59.0-62.0 0.5-1.0 ... ... 0.20 0.10 remainder ... ...
C46500 59.0-62.0 0.5-1.0 ... ... 0.20 0.10 remainder ... ... 0.02-0.06 As
C61300B remainder 0.20-0.50 0.15 0.20 0.01 2.0-3.0 0.10C 6.0-7.5 ... 0.10 Si
0.015 P
C61400 remainder ... ... 1.0 0.01 1.5-3.5 0.20 6.0-8.0 ... 0.015 p
C63000 remainder 0.20 4.0-5.5 1.5 2.0-4.0 0.30 9.0-11.0 ... 0.25 Si
C63200 remainder ... 4.0-4.8D 1.2-2.0 0.02 3.5-4.3D ... 8.7-9.5 ... 0.10 Si
C70600 remainder ... 9.0-11.0 1.0 0.05C 1.0-1.8 1.0C ... ... ...
C70620 86.5 min ... 9.0-11.0 1.0 0.02 1.0-1.8 0.50 ... ... 0.05 C
0.02 P
0.02 S
C71500 remainder ... 29.0-33.0 1.0 0.05C 0.40-1.0 1.0C ... ... ...
C71520 65.0 min ... 29.0-33.0 1.0 0.02 0.40-1.0 0.50 ... ... 0.05 C
0.02 P
0.02 S
C72200 remainder ... 15.0-18.0 1.0 0.05C 0.50-1.0 1.0C ... 0.03-0.70 0.03 Si
0.03 TiC
Note:

A. Designation established in accordance with Practice E 527.
B. When the product is for subsequent welding applications, and is so specified by the purchaser, chromium shall be 0.05 % max, cadmium 0.05 % max, zirconium 0.05 % max and zinc 0.05 % max.
C. When the product is for subsequent welding applications, and is so specified by the purchaser, zinc shall be 0.50 % max, lead 0.02 % max, phosphorus 0.02 % max, sulfur 0.02 % max, and carbon 0.05 % max.
D. Iron content shall not exceed the nickel content.

Mechanical Properties - M20 and O25 Tempers

Copper Alloy UNS No. Thickness, in. [mm] Tensile Strength, min, ksiA [MPa] Yield Strength,B min, ksiA [MPa] Yield StrengthC 0.2 % Offset, min, ksiA [MPa] Elongation in 2 in. [50.0 mm], min, %
  2 [50.0] and under
 50 [345]
 20 [140]
 20 [140]
 35 [35]
C36500 over 2 to 3.5 [50.0 to 100.0], incl
 45 [310]
 15 [105]
 15 [105]
 35 [35]
  over 3.5 to 5 [100.0 to 140.0], incl
 40 [275]
 12 [85]
 12 [85]
 35 [35]
C44300,C44400,and C44500 4 [100.0] and under 45 [310] 15 [105] 15 [105] 35 [35]
C46400,C46500 3 [80.0] and under
 50 [345]
 20 [140]
 20 [140]
 35 [35]
  over 3 to 5 [80.0 to 140.0],incl 50 [345] 18 [125] 18 [125] 35 [35]
C61300 2 [50.0] and under 75 [520] 37 [255] 36 [250] 30 [30]
over 2 to 3 [50.0 to 80.0],incl
70 [485]
 30 [205]
 28 [195]
 35 [35]
  over 3 to 5 [80.0140.0], incl 65 [450] 28 [195] 26 [180] 35 [35]
C61400

 2 [50.0] and under
 70 [485]
 30 [205]
 28 [195]
 35 [35]
  over 2 to 5 [50.0 to 140.0],incl
 65 [450]
 28 [195]
 26 [180]
 35 [35]
C63000 and C63200 2 [50.0] and under
 90 [620]
 36 [250]
 34 [235]
 10 [10]
  over 2 to 3.5 [50.0 to 100.0], incl
 85 [585]
 33 [230]
 31 [215]
 10 [10]
  over 3.5 to 5.0 [100.0 to 140.0], incl
 80 [550]
 30 [205]
 28 [195]
 10 [10]
C70600 and C70620 2.5 [60.0] and under
 40 [275]
 15 [105]
 15 [105]
 30 [30]
  over 2.5 to 5 [60.0 to 140.0], incl
 40 [275]
 15 [105]
 15 [105]
 30 [30]
C71500 and C71520 2.5 [60.0] and under
 50 [345]
 20 [140]
 20 [140]
 30 [30]
  over 2.5 to 5 [60.0 to 140.0], incl 45 [310] 18 [125] 18 [125] 30 [30]
C72200 2.5 [60.0] and under 42 [290] 16 [110] 16 [110] 35 [35]
Note:

A. ksi = 1000 psi.
B. Yield strength is determined as the stress producing an elongation of 0.5 % or under load, that is 0.01 in. [0.254 mm] in a gage length of 2 in. [50.0 mm].
C. Mill test report, if required (Section 18).