2HGr42 and 2HGr50 are API 2H offshore structural steel plates, differing primarily in strength; 2HGr42 has a lower minimum yield strength (around 42 ksi or 290 MPa), while 2HGr50 offers higher strength with a minimum yield of 50 ksi (345 MPa), both providing good toughness for offshore use but Grade 50 is for more critical, higher-stress applications like tubular joints.
Chemical Composition
Grade | C % | Mn % | P % | S% | Si% | Nb | Ti | Al | N | V |
2HGr42 | 0.18 | 0.90-1.35 | 0.030 | 0.010 | 0.05-0.40 | ≤ 0.04 | ≤0.02 | 0.02-0.06 | 0.012 | d |
Grade | C % | Mn % | P % | S% | Si% | Nb | Ti | Al | N | V |
2HGr50 | 0.18 | 0.15-1.60 | 0.030 | 0.010 | 0.05-0.40 | 0.01-0.04 | ≤0.02 | 0.02-0.06 | 0.012 | d |
Mechanical Property
Grade | Yield Strength,kis (Mpa) | Tensile Strength,kis | Elongation |
2HGr42 | t≤2.5in 42(289) t≥2.5in 42(289) | 62-82(427-565) | 2in.(50mm) 22 |
Grade | Yield Strength,kis (Mpa) | Tensile Strength,kis | Elongation |
2HGr50 | t≤2.5in 50(345) t≥2.5in 47(324) | 70-90(483-620) | 2in.(50mm) 21 |
2HGr42 (Grade 42)
Strength: Lower strength, with minimum yield strength around 290-420 MPa (42-62 ksi) depending on thickness.
Application: Used in offshore structures where good toughness is needed, but perhaps less critical stress than Grade 50.
Ductility: Higher ductility (elongation) compared to Grade 50.
2HGr50 (Grade 50)
Strength: Higher strength, with minimum yield strength around 345 MPa (50 ksi) for most thicknesses.
Application: Specifically designed for critical parts of offshore structures, like tubular joints, experiencing tension in the through-thickness direction (Z-direction).
Toughness: Excellent impact toughness and resistance to lamellar tearing, vital for fatigue loading.
