This grade 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.
*Elements represented in percentage
Element | API 2W Grade 50 & 50T |
API 2W Grade 60 |
---|---|---|
Carbon (Max.) | 0.16 | 0.16 |
Manganese | ||
to 1½ in. incl. | 1.15-1.60 | 1.15-1.60 |
over 1 ½ in. incl. | 1.15-1.60 | 1.15-1.60 |
Phosphorus (Max.) | 0.03 | 0.03 |
Sulfur (Max.) | .010 | .010 |
Silicon | 0.05-0.50 | 0.05-0.50 |
Nickel (Max.) | 0.75 | 1.0 |
Chromium (Max.) | 0.25 | 0.25 |
Molybdenum (Max.) | 0.08 | 0.15 |
Copper (Max.) | 0.35 | 0.35 |
Titanium | ||
N 0.005 | 0.003-0.02 | 0.003-0.02 |
N 0.005 | 0.007-0.02 | 0.007-0.02 |
Columbium, max. | 0.03 | 0.03 |
Nitrogen, max. | 0.012 | 0.012 |
Aluminum | ||
Acid soluble or | 0.015-0.055 | 0.015-0.055 |
total | 0.02-0.06 | 0.02-0.06 |
Property | API 2W Grade 50 |
API 2W Grade 50T |
API 2W Grade 60 |
---|---|---|---|
Yield Strength, ksi(MPa) | |||
t 1 in. (25mm) | 50-75 (345-517) |
50-80 (345-552) |
60-90 (414-621) |
t1 in. (25mm) | 50-70 (345-483) |
50-75 (345-517) |
60-85 (414-586) |
Tensile Strength, min., ksi(MPa) | 65 (448) |
70 (483) |
75 (517) |
Elongation in 2 in. (50 mm) min., % | 23 | 23 | 22 |
Elongation in 8 in. (200 mm) min., % | 18 | 18 | 16 |