DNVGL Grade VL AO 690+QT: High-Strength Steel Standards Explained

Extra High Strength Steel

Properties

General

Property	Value	Comment
Carbon equivalent (CET)	0.4 [-]
Carbon equivalent (CEV)	0.64 [-]	for t ≤ 50 mm plate thickness
	0.66 [-]	for 50 < t ≤100 mm plate thickness
	0.68 [-]	t ≤ 65 mm tabulars
	0.7 [-]	for 100 < t ≤ 250 mm plate thickness
Density	7.8 - 7.9 g/cm³	typical for low carbon steel

Mechanical

Property	Temperature	Value	Comment
Charpy impact energy, V-notch	0 °C	62 J	min.
Charpy impact energy, V-notch, transverse	0 °C	46 J	min.
Elastic modulus		200 - 215 GPa	typical for low carbon steel
Elongation		14 %	min., Transverse
		16 %	min.
Poisson's ratio		0.29 [-]	typical for low carbon steel
Shear modulus		82 GPa	typical for low carbon steel
Tensile strength		770 - 940 MPa

Thermal

Property	Value	Comment
Coefficient of thermal expansion	1.32e-05 - 1.38e-05 1/K	typical for low carbon steel
Max service temperature	500 °C	typical for carbon steel
Melting point	1480 - 1526 °C	typical for low carbon steel
Specific heat capacity	465 J/(kg·K)	typical for low carbon steel
Thermal conductivity	25 - 93 W/(m·K)	typical for low carbon steel

Electrical

Property	Value	Comment
Electrical resistivity	1.43e-07 - 1.74e-07 Ω·m	typical for carbon steel

Chemical properties

Property	Value	Comment
Aluminium	0.018 %	min.
Carbon	0.18 %
Chromium	1.5 %
Copper	0.5 %
Manganese	1.7 %
Molybdenum	0.7 %
Nickel	2 %	higher Ni content may be qualified and accepted subject to qualification during manufacturer qualification testing
Niobium	0.06 %
Nitrogen	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	0.025 %	can be 0.005% higher than the specified value
Silicon	0.8 %
Sulfur	0.015 %	can be 0.005% higher than the specified value
Titanium	0.05 %
Vanadium	0.12 %

Technological properties

Property
Supplier Disclaimer	The given information is a rough description and some properties can depend on various factors such as product thickness. Please contact the supplier or refer to the related norm or standard for further information.

Property

Supplier Disclaimer

The given information is a rough description and some properties can depend on various factors such as product thickness. Please contact the supplier or refer to the related norm or standard for further information.

UGI® 4462 Cold‑Drawn Duplex Stainless Steel Wire – Superior Corrosion & Mechanical Performance DNVGL VL DO 690+QT Steel Grade – High Strength & Quality Assurance

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