For any construction project, choosing the right materials is essential. Weldox 700 is a type of high-strength structural steel that has gained popularity in recent years because of its unique properties. In this blog post, we will discuss Weldox 700’s composition, mechanical and physical properties, uses of corrosion resistance, heat treatment, and machining. Whether you are a builder or a DIY enthusiast, this post will help you understand why Weldox 700 is an excellent material for many applications.
What is Weldox 700?
Weldox 700 is an ultra-high-strength steel developed by SSAB, a Swedish steel maker. It offers increased strength, toughness and fatigue properties compared to conventional high-strength steels such as Domex and Strenx. With a minimum yield strength of 700 MPa, Weldox can be used for lightweight structures that require high load-bearing capacity with excellent weldability and formability.
Weldox 700 Composition
Weldox 700 is a high-strength structural steel made from iron, carbon, and other alloying elements. It is characterized by its outstanding toughness, high tensile strength, and good weldability, making it ideal for use in a wide range of applications. Its composition includes Carbon (C), Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S), Chromium (Cr), Molybdenum (Mo), Nickel (Ni), and Boron (B).
C | Si | Mn | P | S | Cu | Ni | Cr | Mo | B |
0.20 max % | 0.60 max % | 1.60 max % | 0.020 max % | 0.010 max % | 0.30 max % | 2.0 max % | 0.70 max % | 0.70 max % | 0.005 max % |
Weldox 700 Mechanical Properties
Regarding mechanical properties, Weldox 700 has a minimum yield strength of 700 MPa or 101,524 psi, a minimum tensile strength of 780 MPa or 113,102 psi, and an elongation at fracture of 14%. Weldox 700 also has excellent toughness at low temperatures and is highly resistant to fatigue wear, making it an ideal material for challenging environments.
Thickness mm | Yield strength Rp 0.2, min MPa | Tensile strength RmMPa | Elongation A5 min % | Typical hardness HBW |
4 – 53 | 700 | 780 – 930 | 14 | 260 – 310 |
(53) – 100 | 650 | 780 – 930 | 14 | 260 – 310 |
(100) – 160 | 650 | 710 – 900 | 14 | 240 – 290 |
Weldox 700 Physical Properties
Regarding physical properties, Weldox 700 has a density of 7.85 g/cm³, a thermal conductivity of 44.5 W/mK, and a specific heat of 0.45 kJ/kg. These properties make it easy to machine and fabricate.
Weldox 700 Equivalent
Thickness mm | – 5 | (5 )- (10) | 10- (20) | 20 – (40) | 40 – (80) | 80 – (100) | 100 – 160 |
Weldox 700: CET (CEV) | 0.34 (0.48) | 0.31 (0.48) | 0.31 (0.48) | 0.36 (0.52) | 0.39 (0.58) | 0.39 (0.58) | 0.41 (0.67) |