ThePipingMart Blog Grades Weldox 900 – Composition, Properties, and Uses

Weldox 900 – Composition, Properties, and Uses

Weldox 900

Weldox 900 is a high-strength steel that has been gaining popularity in various industries for its excellent mechanical and physical properties. Its unique composition makes it a robust and reliable material of choice for any welding project requiring superior strength, durability, and resistance to abrasion. This blog post aims to give you a comprehensive understanding of everything you need about Weldox 900.

What is Weldox 900?

Weldox 900 is an ultra-high-strength steel grade developed by SSAB. It has a minimum yield strength of 900 MPa and excellent weldability due to its low carbon equivalent values. It can be used in many demanding applications, including those subjected to dynamic loading, higher temperatures and corrosive environments.

Weldox 900 Composition

Weldox 900 is a low-alloy high-strength steel with a unique composition measuring 1300 MPa in strength. It is composed of various proportions of iron, carbon, manganese, silicon, chromium, nickel, and molybdenum to achieve its high strength and superior mechanical properties. The quality and purity of steel used in its construction make it ideal for heavy-duty applications requiring high mechanical strength.

C *)
(MAX %)
SI *)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
(MAX %)
0.20 0.50 1.60 0.020 0.010 0.80 0.30 2.0 0.70 0.005

Weldox 900 Mechanical Properties

Weldox 900 has exceptional mechanical properties compared to other steels, making it a popular choice in the construction industry, offshore, and mining applications. It has a yield strength of up to 900 MPa, a tensile strength of up to 1100 MPa, and can remain ductile even under low temperatures. Its high impact strength, low weight, and high resistance to fatigue and wear make it an ideal candidate for heavy-duty applications that require superior mechanical properties.

(MIN %)
4.0 – 53.0 900 940 – 1100 12
53.1 – 120.0 830 880 – 1100 12

Weldox 900 Physical Properties

Weldox 900 has impressive physical properties, primarily strength and durability. With a density of 7.85 g/cm3, it is a low-density metal that can handle heavy loads without compromising performance. It also has excellent thermal conductivity and can withstand high temperatures, making it a suitable choice for welding projects that require superior physical properties.

Weldox 900 Carbon Equivalent CET(CEV)

THICKNESS (mm) 4.0 – 80.0 80.1 – 120.0
Max CET(CEV) 0.39 (0.58) 0.41 (0.63)

Weldox 900 Uses

Weldox 900 steel is widely used in various industries that require high strength, durability, and resistance to abrasion. It is commonly used in construction and mining equipment, transport and lifting equipment, trusses, bridges, and offshore structures. Its unique properties make it a popular choice for projects that demand high mechanical and physical properties, particularly when conventional steel is no match for the required strength.

Weldox 900 Corrosion Resistance

Weldox 900’s composition makes it an excellent choice in harsh environments where corrosion resistance is a significant concern. It has chromium and nickel elements that make it resistant to rust and corrosion caused by moisture in the air, such as in marine and coastal environments. It also has excellent resistance to acidic environments and high temperatures.

Weldox 900 Heat Treatment

Weldox 900 can undergo heat treatment, mainly hardening and tempering, to improve its mechanical properties, particularly its strength, toughness, and ductility. The heat treatment process involves heating the steel to high temperatures and cooling it quickly to produce a hard and durable material that can withstand heavy loads.

Weldox 900 Machining

Machining Weldox 900 can be challenging because of its high strength and hardness. However, it can be successfully machined with the right tools and experience. It requires low cutting speeds, high feed rates, and continuous coolant to prevent overheating and improve the lifespan of the tools.

Weldox 900 Welding

Weldox 900 is an ultra-high-strength steel that can be used in welding applications. It provides superior weldability, excellent corrosion resistance, and higher heat resistance up to 550°C. For high-performance requirements and extreme load-bearing applications, Weldox 900 is the perfect choice due to its exceptional features.


In conclusion, Weldox 900 is a steel product with excellent mechanical and physical properties, making it a popular choice in various industries. Its composition gives it resistance to wear and tear, high strength, and durability, making it ideal for heavy-duty applications. Weldox 900’s chemical composition, combined with the heat treatment and machining process, offers excellent corrosion and wear resistance, strength, toughness, and ductility, making it an attractive material. If you believe this steel product is needed for your next project, contact manufacturers and engineers knowledgeable about using this material. They will provide more information on optimising its use to achieve the desired results.

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