ASTM B122 Specification

Scope

This specification establishes the requirements for copper-nickel-tin alloy, copper-nickel-zinc alloy (nickel silver), and copper-nickel alloy plate, sheet, strip, and rolled bar.

Chemical Composition

Copper Alloy UNS No.Composition, %
Copper, incl SilverNickel, incl CobaltLead, maxIron, maxManganese, maxZincTinChromiumOther Named Elements
C70600remainder9.0-11.040.0581.0-1.81.01.08 max……B
C7062086.5 min9.0-11.00.021.0-1.81.00.50 max …C
C71000remainder19.0-23.00.0581.0 max1.01.08 max …B
C71500remainder29.0-33.040.0580.40-1.01.01.08 max……B
C7152065.0 min28.0-33.00.020.40-1.01.00.50 max……C
C72200remainder15.0-18.00.0580.50-1.01.01.08…0.30-0.70B
C72500remainder8.5-10.50.050.60.20.5 max1.8-2.8…D
C7350070.5-73.516.5-19.50.100.25 max0.50remainder………
C7400069.0-73.59.0-11.00.100.25 max0.50remainder………
C7450063.5-66.59.0-11.00.100.25 max0.50remainder………
C7520063.5-66.516.5-19.50.050.25 max0.50remainder………
C7620057.0-61.011.0-13.50.100.25 max0.50remainder………
C7700053.5-56.516.5-19.50.050.25 max0.50remainder………

Note :

A : Copper plus elements with specific limits, 99.5 % min.
B : When the product is for subsequent welding applications and 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.
C : Phosphorus at 0.2 % max, sulfur at 0.02 % max, and carbon at 0.05 % max.
D : Silicon and titanium each at 0.03 % max.

Mechanical Properties of Rod and Bar

Temper DesignationTensile Strength, ksiA [MPaB]Approximate Rockwell HardnessC,D
StandardFormerMinMaxG ScaleB ScaleSuperficial 30-T
Copper Alloy UNS No. C70600t and C70620
M20′as hot-rolled40 [275)62 (425)–––
H01quarter hard51 [350)67 (460)–51-7852-70
H02half hard58 [400)72 (495)–66-8161-72
H04hard71 [490)83 (570)–76-8667-74
H06extra hard73 [505)85 (585)–80-8871-77
H08spring78 [540)88 (605)–83-9172-78
Copper Alloy UNS No. C71000
M20′as hot-rolled38 [260)56 (385)–––
H01quarter hard47 [325)63 (435)–45-7246-65
H02half hard56 [385)70 (485)–64-7859-6g
H04hard67 [460)79 (545)–76-8467-73
H06extra hard72 [495)84 (580)–79-8769-75
H08spring76 [525)87 (600)–82-8871-75
Copper Alloy UNS No. C71500 and C71520
M20′as hot-rolled45 [310)65 (450)–––
H01quarter hard58 [400)72 (495)–67-8161-71
H02half hard66 [455)80 (550)–76-8567-74
H04hard75 [515)88 (605)–83-8972-76
H06extra hard80 [550)92 (635)–85-9173-77
H08spring84 [580)94 (650)–87-9174-77
Copper Alloy UNS No. C72200
M20′as hot-rolled42 [290)62 (425)–––
H01quarter hard55 [380)67 (460)–63-7858-70
H02half hard58 [400)72 (495)–66-8561-73
H04hard71 [490)85 (585)–76-8867-78
H06extra hard73 [505)90 (620)–79-9069-78
H08spring78 [540)91 (625)–81-9171-79
Copper Alloy UNS No. C72500
M20′as hot-rolled50 [345)70 (485)–––
H01quarter hard55 [380)75 (515)–Up to 85Up to 72
H02half hard65 [450)80 (550)–70-9062-75
H04hard75 [515)90 (620)–75-9066–75
H06extra hard80 [550)95 (655)–80-9570-80
H08spring85 [585)100 (690)–85-9572-80
H10extra spring90 [620)105 (725)–87-9576-80
H14super spring100 [690)125 [860)–92 and over78 and over
Copper Alloy UNS No. C73500
M20′as hot-rolled48 [330)63 (435)–––
H01quarter hard56 [385)69 (475)20-4766-8060-70
H02half hard63 [435)75 (515)38-5375-8467-73
H04hard73 [505)84 (580)51-6183-8872-75
H06extra hard79 [545)90 (620)57-6586-9074-76
Copper Alloy UNS No. C74000
M20as hot-rolled48 [330)63 (435)–––
H01quarter hard55 [380)70 (485)–60-80–
H02half hard63 [435)77 (530)–70-85–
H04hard73 [505)87 (600)–79-91–
H06extra hard79 [545)91 (625)–83-93–
Copper Alloy UNS No. C74500
M20as hot-rolled48 [330)65 (450)–––
H01hard56 [385)73 (505)–51-8050-70
H02half hard67 [460)82 (565)–72-8765-75
H04hard80 [550)94 (650)–85-9273-78
H06extra hard89 [615)102 (700)–90-947fr79
HOBspring95 [655)108 (740)–92-9677-80
Copper Alloy UNS No. C75200 
M20as hot-rolled52 [355)65 (450)–––
H01quarter hard58 [400)72 (495)–50-7549-67
H02half hard66 [455]80 [550]…68-8262-72
H04hard78 [540]91 [625] 80-9070-76
H06extra hard86 [595]98 [675]…87-9474-79
H08spring90 [620]101 [700] 89-9675-80
Copper Alloy UNS No.C76200
M20as hot-rolled55 (380)75 (515)–––
H01quarter hard65 (450)81 (560)–61-8557-74
H02half hard75 (515)91 (625)–78-9169-77
H04hard90 (620)105 (720)–90-957fr79
H06extra hard99 (685)114 (790)–94-9B79-81
H08spring107 (740)122 (840)–97-10080 and over
Copper Alloy UNS No.C77000
M20as hot-rolled60 (415)80 (550)–––
H01quarter hard69 (475)87 (600)23-6270-8863-75
H02half hard78 (540)95 (655)51-6981-9271-78
H04hard92 (635)109 (750)67-7690-9676-80
H06extra hard102 (700)117 (810)73-8095-9979-82
H08spring108 (740)123 (850)77-8397-10080 and over

Note :

A : ksi = 1000 psi.
B : See Appendix X1.
C : Rockwell hardness values apply as follows: The B and G scale hardness values apply to metal 0.020 in. (0.508 mm) and over in thickness, and the 30-T scale hardness values apply to metal 0.012 in. (0.305 mm) and over in thickness.
D : Standard designation defined in Practice B 601.