DNVGL Grade VL DO 690+QT
DNVGL Grade VL DO 690+QT introduction
Extra High Strength Steel
DNVGL Grade VL DO 690+QT general
| Property | Value | Comment |
|---|---|---|
| Carbon equivalent (CET) | Carbon equivalent (CET) of 0.4 [-] | - |
| Carbon equivalent (CEV) | Carbon equivalent (CEV) of 0.64 [-] | for t ≤ 50 mm plate thickness |
| - | Carbon equivalent (CEV) of 0.66 [-] | for 50 < t ≤100 mm plate thickness |
| - | Carbon equivalent (CEV) of 0.68 [-] | t ≤ 65 mm tabulars |
| - | Carbon equivalent (CEV) of 0.7 [-] | for 100 < t ≤ 250 mm plate thickness |
| Density | Density of 7.8 - 7.9 g/cm³ | typical for low carbon steel |
DNVGL Grade VL DO 690+QT thermal
| Property | Value | Comment |
|---|---|---|
| Coefficient of thermal expansion | Coefficient of thermal expansion of 1.32e-05 - 1.38e-05 1/K | typical for low carbon steel |
| Max service temperature | Max service temperature of 500 °C | typical for carbon steel |
| Melting point | Melting point of 1480 - 1526 °C | typical for low carbon steel |
| Specific heat capacity | Specific heat capacity of 465 J/(kg·K) | typical for low carbon steel |
| Thermal conductivity | Thermal conductivity of 25 - 93 W/(m·K) | typical for low carbon steel |
DNVGL Grade VL DO 690+QT chemical
| Property | Value | Comment |
|---|---|---|
| Aluminium | Aluminium of 0.018 % | min. |
| Carbon | Carbon of 0.18 % | - |
| Chromium | Chromium of 1.5 % | - |
| Copper | Copper of 0.5 % | - |
| Manganese | Manganese of 1.7 % | - |
| Molybdenum | Molybdenum of 0.7 % | - |
| Nickel | Nickel of 2 % | higher Ni content may be qualified and accepted subject to qualification during manufacturer qualification testing |
| Niobium | Niobium of 0.06 % | - |
| Nitrogen | Nitrogen of 0.015 % | the total aluminium to nitrogen ratio shall be a minimum of 2:1. When other nitrogen binding elements are used, the minimum Al value and Al/N ratio do not apply |
| Phosphorus | Phosphorus of 0.025 % | can be 0.005% higher than the specified value |
| Silicon | Silicon of 0.8 % | - |
| Sulfur | Sulfur of 0.015 % | can be 0.005% higher than the specified value |
| Titanium | Titanium of 0.05 % | - |
| Vanadium | Vanadium of 0.12 % | - |
DNVGL Grade VL DO 690+QT electrical
| Property | Value | Comment |
|---|---|---|
| Electrical resistivity | Electrical resistivity of 1.43e-07 - 1.74e-07 Ω·m | typical for carbon steel |
DNVGL Grade VL DO 690+QT mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Charpy impact energy, V-notch | -20 °C | Charpy impact energy, V-notch of 62 J | min. |
| Charpy impact energy, V-notch, transverse | -20 °C | Charpy impact energy, V-notch, transverse of 46 J | min. |
| Elastic modulus | - | Elastic modulus of 200 - 215 GPa | typical for low carbon steel |
| Elongation | - | Elongation of 14 % | min., Transverse |
| - | - | Elongation of 16 % | min. |
| Poisson's ratio | - | Poisson's ratio of 0.29 [-] | typical for low carbon steel |
| Shear modulus | - | Shear modulus of 82 GPa | typical for low carbon steel |
| Tensile strength | - | Tensile strength of 770 - 940 MPa | - |
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