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1
Corrosion Resistant Steel forCorrosion Resistant Steel forPitting Corrosion on COTsPitting Corrosion on COTs
of Crude Oil Carrierof Crude Oil Carrier
The NSGP®-1Nippon Steel’s Green Protect-1
Nov. 2008
2
0
1
2
3
4
5
6
7
8
0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
pH
Corro
sion
Rate
mm
/yea
r
← Conventional Steel
NaCl 10wt.%30℃
Air OpenStagnant
n=3
↓ Target0
1
2
3
4
5
6
7
8
0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
pH
Corro
sion
Rate
mm
/yea
r
← Conventional Steel
NaCl 10wt.%30℃
Air OpenStagnant
n=3
↓ Target
Outline of the NSGP®-1A typical example of chemical analysis, AH32 ( mass%)
Chemical composition of NSGP®-1 meets the IACS rule
C Si Mn P S Al Ti Ceq
NSGP®-1 0.124 0.331Conventional 0.140 0.20 1.09 0.018 0.006 0.031 0.014 0.322
IACS Standard ≦0.18 ≦0.5 0.9~1.6 ≦0.035 ≦0.035 ≧0.02 ≦0.02 ≦0.36
meets IACS Standard (including all alloy elements)
NSGP®-1 provides superior corrosion resistance (NaCl 10wt.% pH around 0.8)
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
3
NSGPNSGP®-1 -1 has been applied to actual vessel(All COT bottom have been built with NSGP-1)
NSGPNSGP®-1 -1 has been applied to actual vessel(All COT bottom have been built with NSGP-1)
Ship TAKAMINE (Built by Mitsubishi Heavy Industry) Construction completed with no problem #3 and #4 COTs : without painting
1st Dock inspection : at 2.3 year after launching
1P
1C
1S
1P
1C
1S
2P
2C
2S
2P
2C
2S
3P
3C
3S
3P
3C
3S
4P
4C
4S
4P
4C
4S
5P
5C
5S
5P
5C
5S
FWD
NSGP®-1 without Painting
4
Very low frequencyOnly shallow pits
NSGP®-1 Inspection result after 2.3 years service
No need to repair
7 7 7 20 4 270
200
400
600
800
1000
1200
1400
3P 3C 3S 4P 4C 4S
Pit C
ount
le
ss th
an 4
mm
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
2.3 years
0
2
4
6
8
10
12
3P 3C 3S 4P 4C 4S
No Need to Repair
0
2
4
6
8
10
12
3P 3C 3S 4P 4C 4S
Max
pit
dept
h m
m
No Need to Repair
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
2.3 years
0
2
4
6
8
10
12
3P 3C 3S 4P 4C 4S
No Need to Repair
0
2
4
6
8
10
12
3P 3C 3S 4P 4C 4S
Max
pit
dept
h m
m
No Need to Repair
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
2.3 years
5
1P
1C
1S
1P
1C
1S
2P
2C
2S
2P
2C
2S
3P
3C
3S
3P
3C
3S
4P
4C
4S
4P
4C
4S
5P
5C
5S
5P
5C
5S
FWD
NSGP®-1 without Painting
2nd InspectionAfter 4.2 years service
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
Inspected Area3P & 4P
6
NSGPNSGP®®-1-1 No pit over 4mm depth even after 4.2 years
No pit over 4mm depth
NSGP® -1NSGP® -1
00
200
400
600
800
1000
1200
1400
3P 4P
Pit C
ount
Ove
r 4m
mde
pth
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
4.2 years
0
7
Pit depth after 2.3 and 4.2 years service
Maximum pit depth did not change with time
COT #4P
COT #3PMax. 2.6mm : 2.3 years
↓Max. 2.5mm : 4.2 years
Max. 3.1mm : 2.3 years↓
Max. 3.1mm : 4.2 years
8
Depth at 2.3 and 4.2 years= absolutely proportional
↓ No change in pit depth
Pit growth stoppedafter COT cleaning and drying
Pitting Corrosion Growth Termination
NSGP® -1NSGP® -1
Bottom Plate Thickness ↑
0123456789
10111213141516171819
0 1 2 3 4 5 6 7 8 9 10 1112 1314 1516 171819
Pit Depth after 2.3 years service / mm
Pit D
epth
afte
r 4.2
yea
rs s
ervic
e / m
m
COT Cleaning and drying have beencarried out at after 2.3 years service
Repair Free
3P
4P
Pits to be repairedby welding
Pits to be repairedby Painting
Apparently Pitting Growthhas been TERMINATED
NSGP® -1NSGP® -1NSGP® -1NSGP® -1NSGP® -1NSGP® -1NSGP® -1NSGP® -1
Bottom Plate Thickness ↑
0123456789
10111213141516171819
0 1 2 3 4 5 6 7 8 9 10 1112 1314 1516 171819
Pit Depth after 2.3 years service / mm
Pit D
epth
afte
r 4.2
yea
rs s
ervic
e / m
m
COT Cleaning and drying have beencarried out at after 2.3 years service
Repair Free
3P
4P
Pits to be repairedby welding
Pits to be repairedby Painting
Apparently Pitting Growthhas been TERMINATED
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
9
NSGP®-1 Potential for Repair-free
NSGP®-1 + COT Cleaning → Repair-free
0
2
4
6
8
10
12
0 5 10 15 20 25 30 35
Ship Age / years
0
2
4
6
8
10
12
0 5 10 15 20 25 30 35
Ship Age / years
No need for maintenance during a whole ship life with NS-GP1
Observed Results
No n
eed
to
Repa
ir
Pit Growth Terminatesat Dock inspection
[Found by SR242]
Observed Max. Corrosion Depthwith NS-GP1
Less than 4mm
0
2
4
6
8
10
12
0 5 10 15 20 25 30 35
Ship Age / years
Pit
Dept
h / m
m
Repair Free during whole ship life with NSGP®-1
Repa
ir-fre
e
COT Cleaning
NSGP® -1NSGP® -1NSGP® -1NSGP® -1
1st 2ndCOT Cleaning
10
Summary of the NSGPSummary of the NSGP®®-1-1Summary of the NSGPSummary of the NSGP®®-1-1
11 )) Confirmed excellent corrosion resistanceConfirmed excellent corrosion resistance in actual VLCC in actual VLCC
2) Potential for 2) Potential for repair free for whole ship liferepair free for whole ship life 33 )) Excellent mechanical properties and weldabilityExcellent mechanical properties and weldability
44 )) No dependence on condition of applicationNo dependence on condition of application
11 )) Confirmed excellent corrosion resistanceConfirmed excellent corrosion resistance in actual VLCC in actual VLCC
2) Potential for 2) Potential for repair free for whole ship liferepair free for whole ship life 33 )) Excellent mechanical properties and weldabilityExcellent mechanical properties and weldability
44 )) No dependence on condition of applicationNo dependence on condition of application
11
Practical Advantages of the NSGPPractical Advantages of the NSGP®®-1-1 for Ship Owners for Ship Owners
Practical Advantages of the NSGPPractical Advantages of the NSGP®®-1-1 for Ship Owners for Ship Owners
By using NSGPBy using NSGP®®-1 for COT of crude oil carriers, -1 for COT of crude oil carriers, • Great improvement in the safety and reliabilityGreat improvement in the safety and reliability of marine vessel of marine vessel
s and ins and in the protection of the global environment the protection of the global environment• Corrosion protective Corrosion protective coating is not necessarycoating is not necessary, as do coating ag, as do coating ag
ents and volatile organic compounds.ents and volatile organic compounds.• Repair freeRepair free
↓↓
NYK decided to use the NSGPNYK decided to use the NSGP®®-1-1on all new VLCCs from now onon all new VLCCs from now on
By using NSGPBy using NSGP®®-1 for COT of crude oil carriers, -1 for COT of crude oil carriers, • Great improvement in the safety and reliabilityGreat improvement in the safety and reliability of marine vessel of marine vessel
s and ins and in the protection of the global environment the protection of the global environment• Corrosion protective Corrosion protective coating is not necessarycoating is not necessary, as do coating ag, as do coating ag
ents and volatile organic compounds.ents and volatile organic compounds.• Repair freeRepair free
↓↓
NYK decided to use the NSGPNYK decided to use the NSGP®®-1-1on all new VLCCs from now onon all new VLCCs from now on
12
Draft SOLAS amendment on protection of COT of tankers accepted usage of alternative means (W.G. of DE51 ‘08.2)
What is going on at IMO?What is going on at IMO?What is going on at IMO?What is going on at IMO?
3 All cargo oil tanks of crude oil tankers shall be: .1 coated during the construction of the ship in accordance with the Performance standard for protective coatings for cargo oil tanks of crude oil tankers, adopted by the Maritime Safety Committee by resolution ….or
.2 protected by alternative means of corrosion protection, the effectiveness of which shall be no less than the objectives ....
4 The Administration may exempt a crude oil tanker from the requirements of paragraph 3 of this regulation to allow the use of novel prototype alternatives to the coating system specified in paragraph 3.1, ….
NSGPNSGP®®-1 could be an alternative mean-1 could be an alternative mean
13
NYK LINE
Hidehiko Sato : [email protected]
Nippon Steel Corporation
Tatsuro Nakai : [email protected]
NSGPNSGP®®-1-1Nippon Steel’s Green ProtectNippon Steel’s Green Protect®® -1 -1
NSGPNSGP®®-1-1Nippon Steel’s Green ProtectNippon Steel’s Green Protect®® -1 -1
Note:
NSGP: is a registered trade mark or trade mark of Nippon Steel Corporation in Japan and other countries.