Copper Alloys Stress Corrosion Cracking

Application Data Sheets – Copper Alloys

Stress Corrosion Cracking

Table 24.4 Stress Corrosion Cracking of Copper Alloys in the Atmosphere

Two Industrial Sites (New Haven, Brooklyn) and One Marine Site (Daytona Beach) [17]

CDA
Temper
Time to Failure
Crack Morphologya
New Haven
Brooklyn
Daytona Beach
New Haven
Brooklyn
Daytona Beach
Ident
% Cold Rolled
110 37% NFd 8.5 yrs NF 8.5 yrs NF 8.8 yrs
194 37% NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
195 90% NF 3.2 yrs NF 3.1 yrs NF 3.1 yrs
230 40% NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
260 50% NF 35-47 days 0-23 days NF 2.7 yrs I I
353 50% 51-136 days 70-104 days NF 2.7 yrs T + (I) T + (I)
405 50% NF 2.7 yrs NTe NT
411 50% NF 2.7 yrs NT NT
422 37% NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
425 50% NF 2.7 yrs NT NT
443 10% NF 2.7 yrs NF 2.7 yrs NF 2.7 yrs
40% 51-95 days 41-70 days NF 2.7 yrs T T
40% 51-67 days 33-49 days NF 2.7 yrs T T
510 37% NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
521 37% NF 5.7 yrs NF 5.7 yrs NF 5.7 yrs
619 40%, 9% ? phasec NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
40%, 95% ? phase NF 8.5 yrs NF 8.5 yrs NF 8.8 yrs
638 50% NF 5.7 yrs NF 5.7 yrs NF 5.7 yrs
672 annealed 0-30 days 0-134 days NF 3.1 yrs I I
50% 0-30 days 0-22 days 18-40 days I I I
687 10% 517-540 days 2.3 – NF 2.7 yrs NF 2.7 yrs T T
40% 221-495 days 311-362 days NF 2.7 yrs T T
40% + orderedb 216-286 days 143-297 days NF 2.7 yrs T T
688 10% NF 2.7 yrs NF 2.7 yrs NF 2.7 yrs
40% 4.7-NF 6.4 yrs 2.7-NF 6.4 yrs NF 6.4 yrs T T
40% + orderedb NF 2.7 yrs NF 2.7 yrs NF 2.7 yrs
706 50% NFb 2.2 yrs NF 2.3 yrs NF 2.2 yrs
725 40% NF 2.2 yrs NF 2.3 yrs NF 2.2 yrs
752 annealed NF 3.2 yrs NF 3.1 yrs NF 3.1 yrs
25% NF 3.2 yrs NF 3.1 yrs NF 3.1 yrs
50% NF 3.2 yrs NF 3.1 yrs NF 3.1 yrs
762 annealed 171-NF 3.2 yrs 672-NF 3.1 yrs NF 3.1 yrs T T
25% 142-173 days 236-282 days NF 3.1 yrs T T
50% 142-270 days 236-282 days NF 3.1 yrs T T
766 38% 127-966 days 197-216 days 754-NF 8.8 yrs T T T
770 annealed 731-1003 days 337-515 days NF 3.1 yrs T T
38% 137-490 days 196-518 days 596-1234 days T T T
50% 153-337 days 489-540 days 692-970 days T T T
782 50% 23-48 days 26-216 days 236-300 days T + (I) T + (I) T

aI = intergranular, T = transgranular, and parentheses indicates minor mode.
bHeated 400°F, 1/2 hour.
cNormal Structure for this alloy.
dNF = No failures in time specified.
eNT = Not tested

Approximate Composition of Alloys

CDA Cu Zn P Sn Pb Others
110
Electrolytic Tough Pitch Copper
99.90%
0.04% O
194
High Strength Modified Copper
97.5% 0.13 0.03%
2.4% Fe
195
Strescon
97.0% 0.10% 0.6%
1.5% Fe, 0.80% Co
230
Red Brass 85%
85% 15.0%
260
Cartridge Brass 70%
70.0% 30.0%
353
High Leaded Brass
62.0% 36.2% 1.8%
405
High Conductivity Bronze
95% 4% 1%
411
Lubaloy
91% 8.5% 0.5%
422
Lubronze
87.5% 11.4% 1.1%
425 88.5% 9.5% 2.0%
443
Arsenical Admiralty Brass
71.0% 28.0% 1.0%
0.05% As
510
Phosphor Bronze 5%
95% 0.1% 5.0%
521
Phosphor Bronze 8%
92.0% 0.1% 8.0%
619 86.5%
4.0% Fe, 9.5% Al
638
Coronze
95.0%
2.8% Al, 0.40% Co, 1.8% Si
672
687
Arsenical Aluminium Brass
77.5% 20.5%
2.0% Al, 0.1% As
688
Alcoloy
73.5% 22.7%
3.4% Al, 0.40% Co
706
90-10 Copper Nickel
88.7%
1.3% Fe, 10.0% Ni
725
Tin Bearing Copper Nickel
88.2% 2.3%
9.5% Ni
752
Nickel Silver, 65-18
65.0% 17.0%
18.0% Ni
762 59.0% 29.0%
12.0% Ni
766
770
Nickel Silver, 55-18
55.0% 27.0%
18.0% Ni
782 65.0% 25.0% 2.0%
8.0% Ni, 2% Pb

Note: many of these alloys are proprietary or obsolete. They may not be available.

Source of stress corrosion cracking data: J.M.Popplewell & T.V.Gearing Corrosion 32 p279, 1975

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.
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