API 2W Grade 50 material is a steel plate produced by thermo-mechanically controlled processing for offshore structures
This specification covers four grades (API 2W Grade 42, 50 & 50T, 60) of steel plates that are to be produced by thermo-mechanically controlled processing (TMCP) for use in welded construction of offshore structures.
Chemical composition of API 2W Grade 50 steel (%)
Element |
API 2W Grade 50 & 50T |
|
Carbon (Max.) |
0.16 |
|
Manganese |
|
to 1½in. incl. |
1.15-1.60 |
|
over 1½in. incl. |
1.15-1.60 |
|
Phosphorus (Max.) |
0.03 |
|
Sulfur (Max.) |
0.01 |
|
Silicon |
0.05-0.50 |
|
Nickel (Max.) |
0.75 |
|
Chromium (Max.) |
0.25 |
|
Molybdenum (Max.) |
0.08 |
|
Copper (Max.) |
0.35 |
|
Titanium |
|
N ≤ 0.005 |
0.003-0.02 |
|
N ≥ 0.005 |
0.007-0.02 |
|
Columbium, max. |
0.03 |
|
Nitrogen, max.b |
0.012 |
|
Aluminum |
|
Acid soluble or |
0.015-0.055 |
|
total |
0.02-0.06 |
API 2W Grade 50 steel mechanical properties
Property |
API 2W Grade 50 |
|
Yield Strength, ksi(MPa) |
|
t ≤ 1 in. (25mm) |
50-75ksi |
|
(345-517)MPa |
|
t ≥ 1 in. (25mm) |
50-70ksi |
|
(345-483)MPa |
|
Tensile Strength, min., ksi(MPa) |
65ksi |
|
448MPa |
|
Elongation in 2 in. (50 mm) min., % |
23 |
|
Elongation in 8 in. (200 mm) min., % |
18 |
API 2W Grade 50 is produced by the thermomechanical control process (TMCP) which yields a fine-grained steel with high strength combined with high toughness and excellent formability. The low carbon content and CEQ lead to excellent weldability. Toughness in the heat-affected zone (HAZ) and high resistance against cold cracking produce better welded structures. This can also be ABS certified.
