Some Commonly Used Marine Materials.docx
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Some Commonly Used Marine Materials.docx
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SomeCommonlyUsedMarineMaterials
APPENDIX
fromDexter,S.C.(1985),HandbookofOceanographicMaterials,KriegerPublishing,Malabar,FL.
AluminumAlloys
Material
Composition
Density,ρ(lb/in3)
Aluminumalloy5052
97.25%Al,2.5%Mg,0.25%
Cr
0.097
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
10x106
31(H34)
38(H34)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.92to-1.1
Creviceandsometimespittingattack.
Applicationsdemandinggoodcorrosionresistanceandfatigue
strength.Theseincludefuellines,tanks,andsheets.
SpecialNotes:
Severegalvanicattackcanoccurwhenplacedincontactwithsteel,stainlesssteel,copperalloys,nickelalloys,andtitanium.Corrosionprotectionisdesiredforsubmergedapplications.
Material
Composition
Density,ρ(lb/in3)
Aluminumalloy6061
97.95%Al,1.0%Mg,0.6%Si,
0.25%Cu,0.20%Cr
0.098
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
10x106
40(T6)
45(T6)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.72to-1.07
Creviceandpittingattack.MayalsoundergointergranularattackandSCC.
Applicationsdemandingadequatecorrosionresistanceandgoodmechanicalproperties.Themostversatilealuminumalloyformarineuse.
SpecialNotes:
Severegalvanicattackcanoccurwhenplacedincontactwithsteel,stainlesssteel,copperalloys,nickelalloys,andtitanium.Cathodicprotectionandcoatingisdesiredforsubmergedapplications.
Material
Composition
Density,ρ(lb/in3)
Aluminumalloy7075
90%Al,5.6%Zn,2.5%Mg,
1.6%Cu,0.3%Cr
0.101
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
10.4x106
73(T6)
83(T6)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.72to-0.83
Severecreviceandpittingattack.AlsosusceptibletoSCCandexfoliation.
Applicationsrequiringhighstrengthandlowweight.
SpecialNotes:
Severegalvanicattackcanoccurwhenplacedincontactwithsteel,stainlesssteel,copperalloys,nickelalloys,andtitanium.Mustbeanodized,coated,andcathodically
protectedforsubmergedapplications.
CopperandCopperalloys
Material
Composition
Density,ρ(lb/in3)
Copper
99.9%Cu
0.322
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
17x106
50(Fullyhardened)
55(Fullyhardened)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.12to-0.30
Uniformattackandsometimeslocalizedattackasaresultofmetalionconcentrationcells.Velocityeffectscanalsobe
quitemarked.
Electricalandarchitecturalapplications.Resistsbiofoulingatcorrosionrates>1mpy.
SpecialNotes:
None
Material
Composition
Density,ρ(lb/in3)
Beryllium-Copper,CDA172
97.9%Cu,1.9%Be,0.2%Co
0.298
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
18x106
150-190
(HTand75%ColdWorked)
195-205
(HTand75%ColdWorked)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.10to-0.25
Uniformcorrosionandslightcreviceattack.
Applicationsrequiringgoodcorrosionresistanceandhighstrength.Theseincludesprings,bearings,andbushings.
SpecialNotes:
Asinmostcopperalloys,metalionconcentrationcellsmayform.
Material
Composition
Density,ρ(lb/in3)
RedBrass,CDA230
85%Cu,15%Zn
0.316
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
17x106
49
(50%WorkHardened)
57-72
(50%WorkHardened)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.20to-0.40
Uniformcorrosionandslightdezincification.
Applicationsrequiringgoodcorrosionresistance.
SpecialNotes:
Asinmostcopperalloys,metalionconcentrationcellsmayform.
Material
Composition
Density,ρ(lb/in3)
InhibitedAdmiraltyBrass
71%Cu,28%Zn,1%Sn,
0.6%As,Sb,orPb
0.308
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
16x106
72
(FullyHardened)
88-97
(FullyHardened)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.16to-0.25
Uniformcorrosionandcreviceattack.Erosioncorrosionatvelocities>6fps.
Heatexchangerandcondensertubesandplates.
SpecialNotes:
Asinmostcopperalloys,metalionconcentrationcellsmayform.
Material
Composition
Density,ρ(lb/in3)
NavalBrass
60%Cu,39%Zn,1%Sn
0.304
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
15x106
66
(Hard-Drawn)
88
(Hard-Drawn)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.20to-0.27
Uniformcorrosionanddezincification(notcompletelyeliminatedwithCP).
Condenserplates,propshafts,fasteners.
SpecialNotes:
Dezincificationofthisalloymaybesevere,and,therefore,shouldbeusedwithcautioninsubmergedapplications.
Material
Composition
Density,ρ(lb/in3)
AluminumBronzeD,CDA614
91%Cu,7%Al,2%Fe
0.281
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
18x106
40-55
(Hardened)
75-85
(Hardened)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.09to-0.26
Uniformcorrosionandsomedezincificationandcrevicecorrosion
Corrosionresistanttubing,tanks,fasteners,andsheathing.
SpecialNotes:
Asinmostcopperalloys,metalionconcentrationcellsmayform.
Material
Composition
Density,ρ(lb/in3)
HighSiliconBronzeA,CDA655
94.8%Cu,3.3%Si,1.5%Mn,
<1.5%FeandZn
0.308
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
15x106
45-57
(Half-Hard)
78-98
(Half-Hard)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.17to-0.23
Uniformcorrosionandcrevicecorrosion.
Marinehardware,fasteners,shafting,andheatexchangertubing.
SpecialNotes:
Asinmostcopperalloys,metalionconcentrationcellsmayform.
Material
Composition
Density,ρ(lb/in3)
90-10Copper-Nickel
88.7%Cu,10%Ni,1.3%Fe
0.323
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
18x106
57
(LightDrawn)
60
(LightDrawn)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.15to-0.30
Uniformcorrosionandsomesurfaceattack.
Excellentresistancetomarinefoulingifallowedtofreelycorrode.Usedforseawatertubingandboathulls.
SpecialNotes:
Susceptibletosulfideattack.Velocityeffectsatvelocities>10fps.
Material
Composition
Density,ρ(lb/in3)
70-30Copper-Nickel
68.9%Cu,30%Ni,0.5%Fe,
0.6%Mn
0.323
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
22x106
79
(ColdDrawn)
85
(ColdDrawn)
PotentialinSeawater,ref.Ag-AgCl(V)
CorrosionTypesSuffered
Uses
-0.17to-0.23
Uniformcorrosionandsomesurfaceattack.
Goodstrength.Usedinheat
exchangerswithhighwatervelocities.
SpecialNotes:
Susceptibletosulfideattack.Velocityeffectsatvelocities>15fps.
Material
Composition
Density,ρ(lb/in3)
CastSiliconBrassandBronze
82-91%Cu,5-14%Zn,4%Si
0.302
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
15x106-18x106
22-35
(AsCast)
55-70
(AsCast)
PotentialinSeawater,ref.S.C.E.(V)
CorrosionTypesSuffered
Uses
~-0.27
Uniformcorrosion.
Bearings,impellers,gears,props,pumps,fittings.
SpecialNotes:
None
Material
Composition
Density,ρ(lb/in3)
CastAluminumBronze
81-88%Cu,9-13%Al,
1-5%Fe,others
0.272-0.281
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
14x106-20x106
40-80
(HeatTreated)
80-124
(HeatTreated)
PotentialinSeawater,ref.S.C.E.(V)
CorrosionTypesSuffered
Uses
-0.3to-0.4
Uniformcorrosionanddealloying.
Pumphousings,bearings,impellers,gears,props,fittings.
SpecialNotes:
None
NickelAlloys
Material
Composition
Density,ρ(lb/in3)
Monel400
66.25%Ni,31.5%Cu,1.35%
Fe,0.9%Mn
0.319
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
26x106
90-130
(FullyHardened)
100-140
(FullyHardened)
PotentialinSeawater,ref.S.C.E.(V)
CorrosionTypesSuffered
Uses
-0.04to-0.14
Uniformcorrosion,pitting,andcreviceattack.
Valves,pumps,propshafts,fixtures,fasteners.
SpecialNotes:
Resistserosioncorrosiontohighvelocities.Maycauseseveregalvanicattackoflessnoblemetalswhencoupled.
Material
Composition
Density,ρ(lb/in3)
Inconel625
65.3%Ni,18.6%Cr,9%Mo,4%
Cb,3%Fe,0.05%C
0.305
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
29.8x106
201
(70%ColdWorked)
219
(70%ColdWorked)
PotentialinSeawater,ref.S.C.E.(V)
CorrosionTypesSuffered
Uses
-0.04to+0.10
Highlyresistanttomostformsofattack.
Wirerope,propellerblades,fittings,springs,fasteners.
Partswherelittletonocorrosioncanbeaccepted.
SpecialNotes:
Resistserosioncorrosiontohighvelocities.
Material
Composition
Density,ρ(lb/in3)
Incoloy825
41.8%Ni,21.5%Cr,30%Fe,3%
Mo,1.8%Cu,1%Ti,0.03%C
0.294
ElasticModulus,E(psi)
YieldStrength,σy(ksi)
TensileStrength,σu(ksi)
28x106
35-45
(ColdDrawn)
85-101
(ColdDrawn)
PotentialinSeawater,ref.S.C.E.(V)
CorrosionTypesSuffered
Uses
-0.03to+0.05
Crevicecorrosionandpitting.
Componentsindesalinationplantsandheatexchangers.
SpecialNotes:
ResistanttochlorideSCC.
IronandSteels
Material
Composition
Density,ρ(lb/in3)
DuctileCastIron
3.3-4.0%C,2-3%Si,0.2-
0.6%Mn,<2.5%Ni,>0.15%
totalPandMg,rem
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