Offshore Structures

Offshore structures

KOBELCO has plenty supply record to all types of offshore structures.

* Familiarc stands for FAMILIARC™, Trustarc stands for TRUSTARC™, and Premiarc stands for PREMIARC™.

Types of Offshore Structures / Operating Water Depth

offshore structure

Type of offshore structure-1

Type of offshore structure-2

Type of offshore structure-3

Type of offshore structure-4

Jack-up Rig and Welding Materials

Typical Welding Process

Welding Process of Jack-up Type RigESS

Welding Consumables for 780 MPa Class Steel

Process Product Specification Absorbed
energy /
vEtemp. ≧47J
Remark
SMAW TrustarcLB-88LT AWS A5.5 E11016-G
JIS Z3211 E7816-N5M4 L
-60 °C Polarity: AC
TrustarcLB-80L AWS A5.5 E11018-G H4 -40 °C Polarity: DCEP
SAW TrustarcPF-H80AK /
TrustarcUS-80LT
AWS A5.23 F12A10-EG-G
JIS Z3183 S804-H4
-40 °C Polarity: AC
TrustarcPF-H80AS/
TrustarcUS-80LT
AWS A5.23 F11A10-EG-G -40 °C Polarity: DCEP
GMAW TrustarcDW-A80L AWS A5.29 E111T1-GM-H4
EN ISO 18276 -A- T69 4 Z P M 2 H5
-40 °C Shield gas: Ar-CO2
All position
TrustarcMX-A80L AWS A5.29 E111T1-GM-H4
EN ISO 1876 -A- T69 6 Mn2.5ni M M3 H5
-60 °C Shield gas: Ar-CO2
Flat / Horizontal
TrustarcMG-S88A AWS A5.28 ER120S-G
JIS Z3312 G78A 6 U M N7M4T
-40 °C Shielding Gas: Ar-CO2
GTAW TrustarcTG-S80AM AWS A5.28 ER110S-G
JIS Z3316 W78 A 6 N6C1M4
-60 °C Polarity: DCEP

FCAW: Flux-Cored Wire TRUSTARC™ DW-A80L

HT780MPa
  • Rutile based flux-cored wire for Ar-CO2 shielding gas, good usability in all positional welding.
  • Good notch toughness down to -40°C in as-welded condition.
  • Excellent crack resistance due to low diffusible hydrogen.
  • Applicable for 780 MPa class grade steel of offshore structure

AWS A5.29 E111T1-GM-H4
EN ISO 18276-A-T69 4 Z P M 2 H5
Shipping approvals: ABS, LR, DNV, GL and NK

Typical Test Result of Depositied Metal

Chemical composition Diffusible Hydrogen Content
(ml/100g)
C Si Mn P S Ni Mo
0.07 0.31 1.86 0.007 0.006 2.49 0.16 2.4

Typical Mechanical Test Results of Weld Joint

Macrostructures

Macro

  • Welding parameter
    • Position: vertical up
    • Welding parameter: 200A-24V
    • Base metal: K-TEN780, 50 mmt
    • Shielding gas: 80% Ar-20%CO2

Impact test result

Charpy Impact Test Result

Tensile Test Result

  0.2% Y.S.
(MPa)
T.S.
(MPa)
Elongation
(%)
1st 738 817 24
2st 736 811 23

TRUSTARC™ DW-55LSR / TRUSTARC™ DW-A55LSR - Unsurpassed Notch Toughness in AW/SR Condition

Features

Typical Test Result of Depositied Metal

Product Chemical Composition Diffusible Hydrogen Content
(ml/100g)
C Si Mn P S Ni
TrustarcDW-55LSR 0.06 0.26 1.15 0.008 0.007 1.39 3.9
TrustarcDW-A55LSR 0.05 0.33 1.32 0.009 0.008 0.90 3.9

Typical Mechanical Test Results

Tensile test results of TRUSTARC™ DW-A55LSR in the as-welded and SR conditions

Tensile test results of of TRUSTARC™ DW-A55LSR in the as-welded and SR conditions

Charpy impact test results of TRUSTARC™ DW-55LSR in the as-welded and SR conditions

Charpy impact test results of TRUSTARC™ DW-55LSR in the as-welded and SR conditions

FCAW for 610MPa Class Steel with Unsurpassed Notch Toughness with AW and SR Condition TRUSTARC™ DW-A62LSR

AWS A5.29 E91T1-GM

Applicatiom and Features

TRUSTARC

  • Application: Pressure vessel, spherical tank and etc.
  • Less deterioration of notch toughness with stress relief
  • Excellent notch toughness at -60℃ with as-welded condition / -40℃ with SR
  • Excellent Usability in all positoon welding

Typical Chemical Composition and Mechanical Properties of Deposited Metal

Chemical composition of deposited metal(%) Diffusible hydrogen
(ml/100 g)
C Si Mn P S Ni Others
0.05 0.14 1.29 0.007 0.008 2.59 Mo, Ti, B 3.9

Typical Chemical Composition and Mechanical Properties of Deposited Metal

Typical Chemical Composition and Mechanical Properties of Deposited Metal

Macrostructures (Example)

Macrostructures

Welding Consumables for Duplex Stainless

What is Duplex Stainless ?

- With microstructure consisting virtually 50% austenite phase and 50% ferritic phase, duplex stainless possesses

Duplex Stainless Steel
  • excellent ductility, notch toughness, and resistance to stress corrosion cracking
  • -is classified into standard, lean, and super duplex.

Duplex Stainless Steel

Duplex Stainless Steel

Chemical Distribution

Chemical Distribution

Class of Duplex Stainless Steel and Applicable Welding Material

Class Feature Welding
Material /
Grade
Welding Process Trade Designation
FCAW PremiarcDW-2307 PremiarcDW-2209/
PremiarcDW-329AP
PremiarcDW-2594
SMAW PremiarcNC-2209 PremiarcNC-2594
GTAW PremiarcTG-S2209 PremiarcTG-S2594
Lean Duplex Less Ni, Mo content than standard duplex. substitute for SUS304 (L) and SUS316 (L) UNS-S32101
UNS-S32304
UNS S82122
Standard Duplex Most common duplex, applicable for wide range of industries UNS S31803 ×
UNS S32205 ×
SUS329J3L ×
SUS329J4L × ×
Super Duplex With PRE=Cr+3.3Mo+16N≧40, most excellent corrosion resistance UNS S32750 × ×
UNS S32760 × ×

◎: Applicable, with similar composition 〇: Applicable ×: Not-applicable

Our Product Line-up

Class Trade Designation Process AWS Typical Chemical Composition(mass.%) PRE* Typical Mechanical Properties
C Si Mn Ni Cr Mo N 0.2%
PS
TS EI vE
(MPa) (MPa) (%) (0°ree;C, J)
Lean Duplex PremiarcDW-2307 FCAW A5.22/A5.22M E2307T1-1/4 0.026 0.45 1.26 7.9 24.6 0.03 0.15 27.1 571 750 29 58
Standard Duplex PremiarcTG-S2209 GTAW A5.9/A5.9M ER2209 0.008 0.39 1.67 8.7 22.7 3.10 0.16 35.5 598 773 39 270
PremiarcNC-2209 SMAW A5.4/A5.4M E2209-16 0.028 0.54 1.14 8.8 23.1 3.34 0.15 36.5 667 845 30 97
PremiarcDW-2209 FCAW A5.22/A5.22M E2209T1-1/4 0.028 0.61 0.74 9.1 22.7 3.30 0.13 35.6 639 820 28 73
PremiarcDW-329AP FCAW A5.22/A5.22M E2209T1-1/4 0.024 0.63 0.80 9.2 23.0 3.49 0.13 36.6 643 832 28 55
Premiarc US-2209/
PremiarcPF-S1D
SAW A5.9/A5.9M ER2209 (Wire) 0.021 0.31 1.56 8.9 23.0 3.28 0.15 35.9 618 798 29 69
Super Duplex PremiarcTG-S2594 GTAW A5.9/A5.9M ER2594 0.019 0.44 0.57 9.3 25.0 3.82 0.28 42.0 721 870 31 286
PremiarcNC-2594 SMAW A5.4/A5.4M E2594-16 0.035 0.55 0.66 9.8 26.6 3.86 0.25 43.3 750 935 28 55
PremiarcDW-2594 FCAW A5.22/A5.22M E2594T1-1/4 0.026 0.50 1.18 9.6 25.7 3.79 0.24 42.0 712 905 27 55

* PRE = Cr + 3.3Mo +16N, mass%

Excellent Corrosion Resistance / Strength

Microstructure of Weld Metal

Microstructure of Weld Metal

PRE and Pitting Corrosion Property

PRE and Pitting Corrosion Resistance

Tensile Property

Tensile Property

Excellent Porosity-Resistance, Sound Weld-joint

High porosity-resistant and sound weld joint

PREMIARC DW-2209

Wire: PREMIARC™DW-2209
Base metal: S31803 (20t)
Welding position: Horizontal (2G)

PREMIARC DW-2594

Wire: PREMIARC™DW-2594
Base metal: S32760 (20t)
Welding position: Vertical-up (3G)

PREMIARC DW-2307

Wire: PREMIARC™DW-2307
Base metal: S32304 (20t)
Welding position: Flat (1G)

Welding Materials for Offshore Structures

Note: Use polarity as indicated. Products with "SR" can be used in PWHT condition and As-welded condition, otherwise in As-welded only.

FCAW: Flux-Cored Wire (Ar + 20% CO2)

TS (MPa) min. 490 520 550 610 670 770
YS (MPa) min. 350 400 420 500 550 690
IV (J) min. 35 40 42 50 55 69
Service
temperature
( °C)
-20 Trustarc DW-A50
TrustarcMG-S50(SR)
MG-T1NS Trustarc DW-A65L
TrustarcMG-T1NS
TrustarcMG-S70 TrustarcMG-S80
-30 FamiliarcDW-A55ESR (SR)
-40
-50 Trustarc MX-A55Ni1
Trustarc MX-A55T
TrustarcMG-S50LT(SR)
Trustarc MX-A55Ni1
Trustarc MX-A55T
TrustarcMG-S50LT
TrustarcMG-S62L TrustarcMG-S88A TrustarcMG-S88A
-60 Trustarc DW-A55LSR
Trustarc MX-A55Ni1
TrustarcMX-A55T

FCAW: Flux-Cored Wire (100% CO2)

TS (MPa) min. 490 520 550 610
YS (MPa) min. 350 400 420 500
IV (J) min. 35 40 42 50
Service
temperature
( °C)
-20 FamiliarcDW-50 TrustarcDW-55L
-40
-50 TrustarcDW-50LSR(SR)
-60 TrustarcDW-55L

MG: Solid wire

MX: Metal-cored wire

SMAW: Stick Electrode (DC)

TS (MPa) min. 490 520 550 610 670 770
YS (MPa) min. 350 400 420 500 550 690
IV (J) min. 35 40 42 50 55 69
Service
temperature
( °C)
-20 Familiarc LB-52(SR)
FamiliarcLB-52-18
FamiliarcLB-57 Trustarc LB-62UL
Trustarc LB-62(SR)
TrustarcLB-62U(SR)
TrustarcLB-106
-40 Familiarc LB-52U
FamiliarcLB-7018-1

TrustarcLB-55NS(SR)

Trustarc LB-67L(SR)
TrustarcLB-67LJ
TrustarcLB-70L
-60

SMAW: Stick Electrode (AC)

TS (MPa) min. 490 520 550 610 670 770
YS (MPa) min. 350 400 420 500 550 690
IV (J) min. 35 40 42 50 55 69
Service
temperature
( °C)
-20 Familiarc LB-52(SR)
FamiliarcLB-52-18
FamiliarcLB-57(SR) Trustarc LB-62UL
Trustarc LB-62(SR)
TrustarcLB-62U(SR)
TrustarcLB-106 Trustarc LB-80UL
TrustarcLB-116
-40 FamiliarcLB-52U(SR) TrustarcLB-52NSU(SR)
TrustarcLB-62L(SR)
TrustarcLB-Y75 TrustarcLB-88LT
-60 TrustarcLB-52NSU(SR)

*TRUSTARC™ LB-52U, LB52NSU and TRUSTARC™ LB-62U: for Uranami welding

SAW: Submerged Arc Welding (DCEP)

TS (MPa) min. 490 520 610 670 770
YS (MPa) min. 350 400 500 550 690
IV (J) min. 35 40 50 55 69
Service
temperature
( °C)
-20 Trustarc PF-H55AS /
TrustarcUS-36J(SR)
Trustarc PF-H55AS /
Trustarc US-36J
Trustarc PF-H58AS /
TrustarcUS-36J
Trustarc PF-H80AK /
TrustarcUS-56B
Trustarc PF-H80AS /
TrustarcUS-255
Trustarc PF-H80AS /
TrustarcUS-80LT
-40
-60 Trustarc PF-H62AS /
TrustarcUS-2N

SAW: Submerged Arc Welding (AC)

TS (MPa) min. 490 520 550 610 670 770
YS (MPa) min. 350 400 420 500 550 690
IV (J) min. 35 40 42 50 55 69
Service
temperature
( °C)
-20 Familiarc MF-38 /
FamiliarcUS-36(SR)
Familiarc MF-38 /
TrustarcUS-49A(SR)
Familiarc MF-38 /
TrustarcUS-40
Trustarc PF-H80AK /
TrustarcUS-255
Trustarc PF-H80AK /
TrustarcUS-80LT
-40 Trustarc PF-H55LT /
TrustarcUS-36(SR)
Trustarc PF-H55S /
TrustarcUS-49A(SR)
Trustarc PF-H55S /
Trustarc US-40
Trustarc PF-H80AK /
TrustarcUS-56B
-60 Trustarc PF-H55LT /
Trustarc US-36
Trustarc PF-H55LT /
TrustarcUS-36J(SR)
Trustarc PF-H55LT /
TrustarcUS-36J
Trustarc PF-H80AK /
Trustarc US-56B
Trustarc PF-H55S /
TrustarcUS-2N(SR)

MF-38: Fused type flux

TRUSTARC™ PF-H: Bonded type flux

GTAW: TIG

TS (MPa) min. 490 520 550 610 670 770
YS (MPa) min. 350 400 420 500 550 690
IV (J) min. 35 40 42 50 55 69
Service
temperature
( °C)
-20 FamiliarcTG-S50(SR)
FamiliarcTG-S51T(SR)
TrustarcTG-S62(SR) TrustarcTG-S80AM(SR)
-30 TrustarcTG-S60A(SR)
-40 Trustarc TG-S1MT
TrustarcTG-S1N
-60

Industries

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