Application Technology
Energy
Providing technology for customers to use steel means delivering higher value and more opportunities.
Our ultimate goal is to find a way for us and our customers to grow together through our differentiated technology to use energy steel.
Case Study
Application Technology generally adapted for parts is described below. Please contact us through ‘Contact Us > Q&A' for more details.
High heat input Welded Storage Tank
- High heat input Welded Storage Tank
- Jacket Substructure for Offshore Wind Power
- Offshore Substructures Supported by Suction Pile
- Improvement in Structural Performance
for Linepipes and OCTG - LNG/LPG Outer Storage Tank Using 2,400MPa
Post-tensioning Cable System - LNG Storage Inner Tank Using Wide and Long
9% Nickel Steel Plate
High heat input Welded Storage Tank
Steel
A841, A516, A537 for storage tank
Application Technology
- POSCO produces a variety of steel plates that comply with API Standard 650 for welded storage tank. Most of the listed material complies with ASTM specifications.
- POSCO has newly developed steels guaranteed for tensile strength and impact toughness under large heat input welding, and after PWHT (620 ± 10 °C. 1 hr/inch. 2 cycles)
- POSCO provides total solutions with the combination of characterized steel plate for welded storage tank and 1-pass welding technology(EGW), which can highly improve productivity and quality in constructing steel storage tanks.
| As-was | To-be |
|---|---|
| A537-Cl.1 (N) | High heat input A841-B-Cl.1 (TMCP) |
| A537-Cl.2 (QT) | High heat input A841-B-Cl.2 (TMCP) |
| A537-70 (AR/N) | High heat input A537-70 (AR/TMCP) |
| A516-70 (AR/N) | High heat input A516-70 (AR/TMCP) |
- POSCO’s (S)A841-B-Cl.1, (S)A841-B-Cl.2 and (S)A573-70 show excellent impact toughness in HAZ under large heat input conditions over 150 kJ/cm
Benefits
- Material Cost Savings
- Quicker for Delivery Time
- Reduction of Welding Time
- Easy Management of PJT
Jacket Substructure for Offshore Wind
Power
Steel
Structural steels (for offshore wind) : S355ML, S355G10+M
Application Technology
- Development of Post-Piling Jacket Consisting of Warren Truss Braces
- Structural Optimization Deck and Cylinder for Transition Piece
- Development of Accelerated Construction Method for Post-Piling Jacket
Benefits
- Decrease of Jacket Steel Weight : 12.4%↓
- Decrease of No. of Weld Joints : 38.7%↓
- Increase of Fatigue Life : 17%↑
- Decrease of Offshore Installation Period for 1 Post-Piling Jacket Substructure : 60days 45days (25%)↓
- Project Application : Test Bed Installaltion of 1 Jacket Substructure at the South West Offshore Wind Farm in Korea (‘17.08)
Offshore Substructures Supported by
Suction Pile
Steel
Structural steel for offshore structures(S355ML, S355G10+M, API-2W-60)
Application Technology
Structural optimization of offshore wind turbine substructures Detail design of suction piles
- Structural design : Buckling of suction piles, connections to main legs
- Geotechnical design : Bearing capacity, driveability
Self-floating transportation on the ocean
- Installation analysis
| Phase | Conventional Tripod | Floating Suction Pile Tripod |
|---|---|---|
| Transport & Sink |
 |
 |
| Pile Driving |
 |
 |
Benefits
Fast installation compared to the conventional driven pile supported substructures : Offshore installation time can be reduced by 60~70%. No noise or vibration during pile driving : Satisfies the tightened offshore environmental regulations. Semi-gravity by counter weight on suction pile : Increases tensile resistance against cyclic loads.
Improvement in Structural Performance
for Linepipes and OCTG
Steel
API X65/X70/X80 for oil and gas pipelines
API J55/K55/L80/N80/P110 for OCTG
Application Technology
Requirements for predicting mechanical properties of linepipes and OCTG, post pipe forming process
- Yield stress prediction of linepipes and OCTG by using UOE/JCO/ERW manufacturing process simulation Requirements for developing high performance linepipes and OCTG possessing high collapse and bending capacity
- Optimization of coil & plate properties and suggestion of optimized UOE/JCO/ERW manufacturing process for improving structural performance
Benefits
Provides customers with the information regarding the change of mechanical properties from the manufacturing
process and heat treatment.
Development support for high performance linepipes and OCTG possessing high collapse and bending capacity.
LNG/LPG Outer Storage Tank Using
2,400MPa Post-tensioning Cable System
Steel
2,400MPa Steel strand for prestressed concrete(PosCABLE98)
- Registered on Korean standard(KS D7002, ‘11.3)
- 28% increase in strength compared to 1860MPa strand
- Verified through application on bridges and LPG tank
Application Technology
2,400MPa PT cable system(strand+anchorage) and anchorage zone design
- 2,400MPa,Φ15.2mm, 7-wire PC strand for prestressed concrete(Conventional grade = 1,860MPa)
Design optimization using 2,400MPa PT cable system
Performance qualification of full scale cable system
- Static, cryogenic, and load-transfer tests for PT cable system
Benefits
Many prestressed concrete bridges are designed and built.
Reduction of prestressing tendons / ducts / anchorages up to 25%
Construction(PT) cost / period : 10~15%↓
Various methods of application to similar structures such as silo and nuclear power plants are also available.
LNG Storage Inner Tank Using Wide and
Long 9% Nickel Steel Plate
Steel
- A553-TY1 (Quenched and Tempered)
- Min. CVN value at -196 : 34J (ASTM), 70J (POSCO)
- Max. width and length of shell plate(≥10t) : W5m*L15m
Application Technology
- Cutting, bevelling, bending, and transportation of wide and long plates
- Economic benefit analysis based on panel redesign for shell
- WPS(Welding Procedure Specification) and PQR(Procedure Qualification Record)
Benefits
- Fabrication period reduction : 20 days per 1 course
- Fabrication cost reduction : 20~30% (w/o 9%Ni plate)
* Use of wide plate in shell could increase weight up to 1%
