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Steel Plates for Offshore Structures via Thermo-Mechanical Control Processing
 

API 2W 60

Overview

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.

Chemical Requirements

ElementGrade 42Grade 50 & 50TGrade 60
Carbon (Max.) 0.16 0.16 0.16
Manganese  
    to 1½in. incl. 0.90-1.35 1.15-1.60 1.15-1.60
    over 1½in. incl. 0.90-1.60 1.15-1.60 1.15-1.60
Phosphorus (Max.) 0.03 0.03 0.03
Sulfur (Max.) .010 .010 .010
Silicon 0.05-0.50 0.05-0.50 0.05-0.50
Nickel (Max.) 0.75 0.75 1.0
Chromium (Max.) 0.25 0.25 0.25
Molybdenum (Max.) 0.08 0.08 0.15
Copper (Max.) 0.35 0.35 0.35
Titanium  
    N ≤ 0.005 0.003-0.02 0.003-0.02 0.003-0.02
    N ≥ 0.005 0.007-0.02 0.007-0.02 0.007-0.02
Columbium, max. 0.03 0.03 0.03
Nitrogen, max.b 0.012 0.012 0.012
Aluminum  
    Acid soluble or 0.015-0.055 0.015-0.055 0.015-0.055
    total 0.02-0.06 0.02-0.06 0.02-0.06

bNitrogen shall not be intentionally added.

Tensile Requirements

PropertyGrade 42Grade 50Grade 50TGrade 60
Yield Strength, ksi(MPa)  
    t ≤ 1 in. (25mm) 42-67
(290-462)
50-75
(345-517)
50-80
(345-552)
60-90
(414-621)
    t ≥ 1 in. (25mm) 42-62
(290-427)
50-70
(345-483)
50-75
(345-517)
60-85
(414-586)
Tensile Strength, min., ksi(MPa) 62
(427)
65
(448)
70
(483)
75
(517)
Elongation in 2 in. (50 mm) min., % 24 23 23 22
Elongation in 8 in. (200 mm) min., % 20 18 18 16