S460G1+QT is a high-strength offshore structural steel plate certified under EN 10225 for fixed offshore structures, oil and gas platforms, and wind turbine foundations. The "+QT" suffix indicates the quenched and tempered delivery condition, which provides an excellent combination of high strength and toughness through heat treatment. It has a minimum yield strength of 460 MPa (for thickness ≤16mm) and tensile strength ranging from 520 to 670 MPa, with a minimum elongation of 17%. Maximum plate thickness is 100 mm. The chemical composition includes carbon ≤0.14% and sulfur ≤0.010%. This grade is designed for demanding structural components requiring high strength-to-weight ratio and good weldability.
S460G2+QT is also a quenched and tempered offshore structural steel certified under EN 10225, sharing the same minimum yield strength of 460 MPa and tensile strength range of 520-670 MPa as G1. However, S460G2+QT offers stricter chemical composition controls, featuring a lower sulfur limit of ≤0.007% (compared to ≤0.010% for G1). The higher "G" number (G2 vs. G1) signifies more stringent requirements for purity and toughness. Like G1, it is impact tested at -40°C with a minimum energy requirement of 60 Joules. Maximum plate thickness is also 100 mm. This grade is widely used for critical applications such as offshore drilling platforms, jack-up rig legs, and marine engineering projects requiring maximum strength-to-weight ratio and superior low-temperature performance.
Both S460G1+QT and S460G2+QT are EN 10225-certified quenched and tempered offshore structural steels with identical mechanical properties (minimum yield 460 MPa, tensile 520-670 MPa) and impact requirements (-40°C, 60J). Their primary difference lies in chemical purity: S460G1+QT is suitable for general offshore applications, while S460G2+QT features stricter limits on sulfur (≤0.007%), offering enhanced low-temperature toughness and weldability for more demanding offshore structures. Both grades maintain excellent weldability and are available up to 100mm thickness.
Mechnical property for S460G1+QT steel plate:
| Thickness (mm) | ||||||
| S460G1+QT steel plate | ≤ 16 | > 16 ≤ 25 | > 25 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 |
| Yield strength (≥Mpa) | 460 | 440 | 420 | 415 | 405 | 400 |
| Tensile strength (Mpa) | 540-700 | 530-690 | 520-680 | 515-675 | 505-665 | 500-660 |
Mechnical property for S460G2+QT steel plate:
| Thickness (mm) | ||||||
| S460G2+QT steel plate | ≤ 16 | > 16 ≤ 25 | > 25 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 |
| Yield strength (≥Mpa) | 460 | 440 | 420 | 415 | 405 | 400 |
| Tensile strength (Mpa) | 540-700 | 530-690 | 520-680 | 515-675 | 505-665 | 500-660 |
Chemical composition for S460G1+QT steel plate
| Main chemical elements composition of S460G1+QT steel plate | ||||||||
| C | Si | Mn | P | S | Cr | Mo | Nb+V | Nb+V+Ti |
| 0.14 | 0.15-0.55 | 1.65 | 0.020 | 0.010 | 0.25 | 0.25 | 0.09 | 0.11 |
| Ni | Alt | Cu | N | Nb | Ti | V | Cr+Mo+Ni+Cu | |
| 0.70 | 0.015-0.055 | 0.30 | 0.010 | 0.040 | 0.025 | 0.080 | 0.90 | |
Chemical composition for S460G2+QT steel plate
| Main chemical elements composition of S460G2+QT steel plate | ||||||||
| C | Si | Mn | P | S | Cr | Mo | Nb+V | Nb+V+Ti |
| 0.14 | 0.15-0.55 | 1.65 | 0.020 | 0.010 | 0.25 | 0.25 | 0.09 | 0.11 |
| Ni | Alt | Cu | N | Nb | Ti | V | Cr+Mo+Ni+Cu | |
| 0.70 | 0.015-0.055 | 0.30 | 0.010 | 0.040 | 0.025 | 0.080 | 0.90 | |
