ThePipingMart Blog Grades Weldox 700 – Composition, Properties, and Uses

Weldox 700 – Composition, Properties, and Uses

Weldox 700

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)

Weldox 700 Thickness

Weldox 700 is a series of high-strength structural steel plates with nominal yield strength of up to 700 MPa. The thickness range generally starts from 6 mm and goes up to 30 mm.

Weldox 700 Uses

Weldox 700 is used to construct many different types of structures, including cranes, bridges, excavators, and trailers. It is also used in the mining and forestry industries, where high strength and durability are essential. It is also popular for pressure vessels and boilers because of its excellent impact resistance.

Weldox 700 Corrosion Resistance

Weldox 700 offers high corrosion resistance due to its composition, which includes chromium and molybdenum. It is highly resistant to rust and erosion, making it an ideal material for outdoor applications. Moreover, Weldox 700 can withstand harsh weather conditions, making it highly durable and long-lasting.

Weldox 700 Heat Treatment

Weldox 700 can be heat treated to increase its strength further. Heat treatment involves heating the material above its critical temperature and cooling it rapidly to improve its toughness and hardness. This treatment helps to improve its load-carrying capacity and durability, making it suitable for heavy-duty applications.

Weldox 700 Machining

When it comes to machining, Weldox 700 is easier to machine than other high-strength structural steels. However, it requires special tools and equipment to be machined correctly.

Weldox 700 Welding

Weldox 700 can be welded using various welding techniques, including MIG, TIG, and stick welding. Welding may increase the material’s hardness, but this can be reduced by heat treatment and post-welding processing.


In conclusion, Weldox 700 is an excellent material for use in a range of high-stress applications due to its high strength, toughness, and durability. Its excellent corrosion resistance makes it ideal for harsh environments, and its easy machining allows for easy fabrication. Whether you’re a professional contractor or a DIY enthusiast, Weldox 700 is a material you should consider for your next project. Its versatility and reliability make it an investment worth considering for your project’s needs.

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