NETIS registration ： KK-150056-A

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A104en_01_201710f

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CORSPACETM

Plate

CORSPACE™

Corrosion Resistance Steel for Repainting Cycle Extension

Necessity and expected effect

COrrosion Resistance Steel for rePAinting Cycle Extension

TMTMFeatures

２1

CORSPACE enables you to extend the coating cycle when compared with conventional steel, thereby reducing the life cycle cost.

Adding a fine amount of tin significantly reduces the corrosion mass.It produces an effect in coastal areas where salt damage is severe.

Durability of coating pinhole part, coating defect part and round edge part

Insufficient cleaning during maintenance and repair (narrow part, etc.)

Repainting coat Reinforcing surface preparation

Effect expected using CORSPACE

• Corrosion from coating pinhole part and deteriorated part• Corrosion from sharp edge part of element

Issues

Advantages in maintenance (example)CORSPACE can extend the coating cycle to about

double that compared with conventional steel under

the same coating/installation environment. Therefore,

while conventional steel needs coat repainting three

times every 100 years, CORSPACE can reduce it to

once and approximately halve the cost for repainting

maintenance cost.

Furthermore, reducing the number of times of coat

repainting will contribute to VOC discharge control,

and thus the environmental load can be reduced.

Conventional steel

First coatingFirst coating

Steel standard extra

※C

ost

(1,0

00 y

en/t

on)

Aging (year)

※Steel standard extra + Initial coating + Repainting coat

【Conditions for calculation】①Multiple main girders ＝ 16m2/ton②Coating relevant condition: “Heavy-duty coating”(edited by the Japanese Society of Steel Construction)

30 60 90 1200

Second coating

Third coating

▲52％

▲34％

▲54％▲13％

CORSPACE

800

700

600

500

400

300

200

100

0

The life-cycle cost can be decreased by reducing the coat repainting to once every 100 years.

Corrosion resistance steel for repainting cycle extension developed

Advantages in order reception, design and manufacturing

Point-adding factors in evaluation during proposal and after completion.

• CORSPACE has a function to inhibit corrosion of steel at the parts where the coating film is deteriorated or the film is thin.

• It delivers a much wider effect in a place where salt damage is severe, so its application to an environment to which a weather-resistant steel bridge cannot be applied is effective.

• The effect of application in an antifreezing agent spraying area can also be expected.

Nickel system highlyweather resistant steel

(non-coated)

1-20 km from coast line

≦0.05 mdd

Coast line

Sea

JIS weatherproof steel(non-coated)

Image of applying CORSPACE to a bridge

CORSPACE(coated)

Conforming to all JIS standards required for bridges.(corresponding to the tensile strength of class 400-570 N/mm2)

A fine amount of Tin (Sn) is added within the range of chemical components permitted by the above JIS standards.

■ JIS G3101 Rolled steels for general structure (SS)■ JIS G3106 Rolled steels for welded structure (SM)■ JIS G3140 High yield strength steel plates for bridges (SBHS)

Conforming to three standards (steel plate)SS400 -CORSPACE

SM400 -CORSPACE

SM490 -CORSPACE

SM490Y -CORSPACE

SM520 -CORSPACE

SM570 -CORSPACE

SBHS400 -CORSPACE

SBHS500 -CORSPACE

6-200

6-200

6-200

6-100

6-100

6-100

6-100

6-100

In compliance with JIS G3101 SS400

In compliance with JIS G3106 SM400

In compliance with JIS G3106 SM490

In compliance with JIS G3106 SM490Y

In compliance with JIS G3106 SM520

In compliance with JIS G3106 SM570

In compliance with JIS G3140 SBHS400

In compliance with JIS G3140 SBHS500

Symbol of type Applied plate thickness (mm) Chemical component / Mechanical property

• We can serve you with the NETIS registration technology (KK-150056-A registered in February 2016), technical proposals and construction performance rating.

• CORSPACE is described as a “tin added steel” in the “material used” of the “Bridge Structure Design/Construction Procedure” (issued in June 2016) by the Metropolitan Expressway Company Limited.

• CORSPACE conforms to all the JIS standards of steel plates used for bridges, and the plate manufacturable range is equivalent to that of conventional steel.

• Various types of workability such as cutting, bending, and welding are equivalent to that for conventional steel.

• We are lining up exclusive weld materials and bolts.

The Ministry of Land, Infrastructure, Transport and TourismNew Technology Information System (NETIS)

KK-150056-ANETIS

Bridges are usually assumed to be in service for 100 years, and appropriate maintenance is

required during the period. The major control item of the maintenance items is the progress of

corrosion from the deteriorated part of the coating film, and periodical recoating is necessary.

Recoating accounts for a large portion of the maintenance cost, and the reduction of the

number of recoatings is desired from the viewpoint of reducing the environmental load.

In a severe salt damage environment, the maintenance cost and environmental load can be reduced by extending the recoating cycle.

Airborneamount of salt ＞ 0.05 mdd　

Airborneamount of salt

Mechanism

Corrosion-resistant properties (acceleration test)

Corrosion of conventional steel progresses due to anode/cathode reaction. In the coating defect part of thin film under water, chloride ions condense and pH decreases, so the progress of corrosion is accelerated. Meanwhile, with CORSPACE, Sn also liquates out at the same time as the anode reaction of Fe (dissolution reaction), and the eluted Sn ions inhibit the elution of Fe ions, thereby preventing the progress of corrosion.

Chloride （Cl–） Chloride （Cl–）

Snion

SnionSn

ion

pH decreasesCoating film

Coating defect partWater

CORSPACECORSPACE

Water

Coating film

Fe2＋ Fe2＋

Fe2＋

Evaluation by acceleration test (SAE J2334 test)

〈Coating specifications〉

〈Test conditions〉 ● SAE J2334

50°C, relative humidity 100%, for 6 hours

Moistening

60°C, relative humidity 50%, for 17.75 hours

Drying

For 15 minutesWater solution： 0.5% NaCl, 0.1% CaCl2, 0.075% NaHCO3, pH 8

Salt adherence

In not only regular coating but also heavy-duty coating subjected to zinc system surface preparation, CORSPACE inhibits corrosion at the coating defect part, and it can be expected to extend the repainting coat cycle.

Corrosion evaluation of coating specifications subjected to zinc system surface preparation (SEA J2334 test)

Dep

th o

f cor

rosi

on (m

m)

1.2

1

0.8

0.6

0.4

0.2

00 20 40 60 80 100 120 140

Number of cycles

0 20 40 60 80 100 120 140

Number of cycles

Pee

l-of

f are

a (m

m2 )

500

400

300

200

100

0

Peel-off area and corrosion depth of coating defect part with anticorrosion base

Peel-off area Depth of corrosion

Appearance of coating defect part after testing

Conventionalsteel

40 cycles 80 cycles 120 cycles

CORSPACE

6000

5000

4000

3000

2000

1000

0

Pee

l-of

f are

a (m

m2 )

0 20 40 60 80 100 120 140

Number of cycles

Fe

Fe-0.2SnFirst layer

–

160 μm

Inorganic zinc

General-purpose epoxy resin coating

Coating material Film thickness

〈Coating specifications〉

Corrosion-resistant properties(acceleration test)

First layer

Second layer

Third layer

Fourth layer

Fifth layer

15 μm

60 μm

60 μm

30 μm

25 μm

190 μm

Inorganic zinc

Back coat of epoxy resin coating material

Back coat of epoxy resin coating material

Middle coat of fluorine resin coating material

Middle coat of fluorine resin coating material

Total

Coating material Film thickness

Conventional steel

CORSPACE

Conventional steel

CORSPACE

Elution of Fe2+ ion

43

Corrosion-resistant properties(actual environment exposure test)

Corrosion-resistant properties(actual environment exposure test)

Exposed for 3 years

Evaluation after outdoor exposure test (Higashi-Kobe Bridge)

〈Place〉

〈Environment〉

〈Coating specifications〉

● Adjacent to the pier of the Higashi-Kobe Bridge of Hanshin Highway Route 5 Bayshore Line● Amount of airborne salt: 0.04 to 0.07 mdd (Public Works Research Institute method)

4000

3000

2000

1000

0

4000

3000

2000

1000

00 1 2 3 4

Conventional steel

Years0 10 20 30 40 50 60 70 80 90

Number of cycles

CORSPACE

Pee

l-of

f are

a (m

m2 )

Pee

l-of

f are

a (m

m2 )

Conventional steel

CORSPACE

Exposure test at the Higashi-Kobe Bridge Peel-off area Depth of corrosionSAE J2334 test with the same specifications as in the exposure test at the Higashi-Kobe Bridge

Cross-cut

100×60×3mmt

Horizontal

Conventional steel CORSPACEConventional steel

Horiz

onta

l und

er s

urfa

ce

CORSPACE

Coating film peel-off status around scratched part of horizontal exposure material

Higashi-Kobe Bridge

Higashi-Kobe Bridge

Exposed for 1 year

Coating specificationsⅠ Coating specificationsⅡ Coating specificationsⅢ75 μm

250 μm

15 μm

190 μm

—

175 μm

Conventional steel

CORSPACE

Coating specifications

Inorganic zinc-rich paint

Whole film thickness

Evaluation after outdoor exposure test (Hasaki-city, Ibaraki)

First layerSecond layerThird layer

75 μm120 μm30 μm25 μm

250 μm

15 μm120 μm30 μm25 μm

190 μm

– 120 μm30 μm25 μm

175 μm

Inorganic zincEpoxy resin coating

Fluorine resin coating materialFluorine resin coating material

Total

Coating material CoatingspecificationsⅠ

CoatingspecificationsⅡ

CoatingspecificationsⅢ

Film thickness

CORSPACEConventional steel

Pee

l-of

f are

a (%

)

50

40

30

20

10

0

CORSPACEConventional steel

Dep

th o

f cor

rosi

on (μ

m)

800

700

600

500

400

300

200

100

0

【coating specificationsⅢ】 【coating specificationsⅢ】

First layerSecond layer

–30 μm25 μm55 μm

Inorganic zincFluorine resin coating materialFluorine resin coating material

Total

〈Place〉〈Environment〉

〈Coating specifications〉

● Hasaki-city, Ibaraki● Amount of airborne salt 0.4 mdd (Public Works Research Institute method)

Coating material Film thickness

65

Recoating time extension effect Weld materialWeld materialWeld materialWeld material

BoltBoltBoltBolt

Higashi-Harima Nanboku Road (Mizuashi Shintsuji No. 5 Viaduct)

UnloaderHanshin Expressway Sampo JCT

Exclusive weld material for CORSPACE

Examples of applications of CORSPACE

SS400 -CORSPACESM400 -CORSPACESM490 -CORSPACESM490Y -CORSPACESBHS400 -CORSPACE

L-55・PX

SM570 -CORSPACESBHS500 -CORSPACE

SM520 -CORSPACE

L-60・PX

YM-26・PX

YM-60C・PX

YM-55C・PX

SF-1・PX

SF-60・PX

SM-1F・PX

SM-60F・PX

YF-15 × Y-D・PX

YF-15B × Y-DM・PX

YF-15B × Y-DM3・PX

YF-800 × Y-D・PX

NF-820 × Y-DM・PX

NF-820 × Y-D・PX

Steel typeCoated electrode

Solid wireWire with flux

All positionAll position Fillet Butt FilletSubmerged arc weld material

Example of performance of deposit metal of exclusive weld material for CORSPACE

L-55・PXL-60・PXYM-26・PXYM-55C・PXYM-60C・PXSF-1・PXSM-1F・PXSF-60・PXSM-60F・PXYF-15 × Y-D・PXYF-800 × Y-D・PXYF-15B × Y-DM3・PXNF-820 × Y-D・PXYF-15B × Y-DM・PXNF-820 × Y-DM・PX

BrandChemical component (%) Tensile performance Impact performance

C Si Mn P S Ni Mo SnProof stress

(MPa)Tensile strength

(MPa)Temperature

(°C)vE(J)

0.070.070.080.060.050.060.050.050.050.070.040.080.050.080.06

0.610.560.390.460.480.440.540.550.570.450.680.310.630.310.59

1.101.070.971.021.061.191.461.571.801.541.551.761.881.701.81

0.0120.0100.0050.0040.0040.0130.0180.0110.0140.0160.0090.0130.0070.0130.005

0.0030.0060.0110.0100.0100.0060.0140.0060.0100.0060.0110.0060.0110.0050.011

0.70

0.53

0.24

0.220.23

0.21

0.370.40

AddAddAddAddAddAddAddAddAddAddAddAddAddAddAdd

503612483521554539510595567511415553478595564

607700571606629612597665642601534648588699662

-30-2000-500-5-50000

-20-5

1451261331401271366478819349

108816770

*Contact information: NIPPON STEEL & SUMIKIN Bolten CORPORATION4-16 Midorigi 1-chome, Suminoe-ku, Osaka-shi, Osaka Prefecture, 559-0022 JAPANTEL: 06 (6682) 3261 FAX: 06 (6682) 3270

■ Recoating time judgment

Corrosion generation limit standard diagram

(Steel Highway Bridge Anticorrosion Handbook in March 2014)

3

1

1 2 3

2

Degree of peel-off

Degr

ee o

f cor

rosi

on

①

②

②

③

25

20

15

10

5

00 50 100 150 200 250 300 350 400

Conventional steelCORSPACE

Conventional steel(deterioration curve)CORSPACE(deterioration curve)

Number of cycles

Gompertz function

Pee

l-of

f are

a (%

)

Time for the peel-off area to become 15%(recoating time judgment ③)

For CORSPACE, approximately twice that of conventional steelFor CORSPACE, approximately twice that of conventional steel

4

4

〈Test conditions〉● Coating that simulates the C5 system● Foundation exposed by incising the coating film in an X-shaped state● Cyclic corrosion test (SAE J2334)● Evaluation of coating film peel-off area

Coating film peel-off area of CORSPACE and conventional steel

〈Coating specifications〉

First layer

Second layer

Third layer

Fourth layer

Fifth layer

15 μm

60 μm

60 μm

30 μm

25 μm

190 μm

Inorganic zinc

Back coat of epoxy resin coating material

Back coat of epoxy resin coating material

Middle coat of fluorine resin coating material

Middle coat of fluorine resin coating material

Total

Coating material Film thickness

■ Evaluation of peel-off

Evaluation

1234

0345

01315

Peel-off area (%)JIS K 5600-8-5:1999Designation of degree of flaking

JIS K 5600-8-3Designation of degree of rusting

(corrosion area %)

■ Evaluation of corrosion

Evaluation

4

1

8.0≦X

X＜0.05

Ri4 or more(8.0% or more)

Ri1（0.05％）

2 0.05≦X＜0.5 Ri2（0.5％）

3 0.5≦X＜8.0 Ri3, Ri4（1.0％, 8.0%）

Generation status

Generation area (%) Appearance status

0.05％

0.5％

8.0％

0.05％

0.5％

8.0％

① Recoating is unnecessary for the for the time being② Recoating after a couple of years is planned③ Early recoating is examined

*Contact information: Nippon Steel & Sumikin Welding Co., Ltd.Shingu Bldg., 4-2 Toyo 2-chome, Koto-ku, Tokyo, 135-0016 JAPANTEL: 03 (6388) 9000 FAX: 03 (6388) 9160http://www.welding.nssmc.com/en/

No corrosion is found, and coating film is in a sound state.

Slight corrosion is found, but the coating film is maintaining the corrosion resistant function.

Corrosion is visible, and the corrosion resistant function is impaired at part of the coating film.

Corrosion has progressed, and the coating film has lost the corrosion resistant function.

We are offering various types of weld material that correspond to the grades of CORSPACE at Nippon Steel & Sumikin Welding Co., Ltd.*

As the high-strength bolts for CORSPACE, NIPPON STEEL & SUMIKIN Bolten CORPORATION* is offering high-strength hexagonal bolts (F10TMR) and high-strength TC bolts (S10TMR).

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MEMO MEMO

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