ThePipingMart Blog Grades Weldox 690 – Composition, Properties, and Uses

Weldox 690 – Composition, Properties, and Uses

Weldox 690

In the world of high-performance steel, Weldox 690 is a name that commands attention. This advanced material is engineered for exceptional strength, toughness, and durability, making it an ideal choice for heavy-duty applications in mining, construction, and other challenging fields. In this comprehensive guide, we’ll explore the composition, mechanical and physical properties, corrosion resistance, heat treatment, and machining capabilities of Weldox 690. Whether you’re a designer, engineer, or fabricator, this guide will help you understand what sets this material apart and how to make the most of its unique properties.

What is Weldox 690?

Weldox 690 is a high-strength structural steel developed by SSAB, one of the world’s leading suppliers of speciality steel. It’s low carbon equivalent and fine grain structure provides an excellent balance between strength and ductility. This makes it an ideal material for applications that require more excellent resistance in extreme conditions, such as heavy-duty construction projects or bridge building.

Weldox 690 Composition

Weldox 690 is a high-strength, low-alloy steel with a complex chemical composition designed to optimize its mechanical properties. The main elements in Weldox 690 are carbon, manganese, silicon, chromium, molybdenum, and nickel. Together, these elements create steel that can withstand extreme loads, resist fatigue and wear, and provide excellent hardness and toughness.

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 690 Mechanical Properties

Weldox 690 is a versatile steel with exceptional mechanical properties, including high strength, hardness, and toughness. It has a minimum yield strength of 690 MPa and a tensile strength range of 770–940 MPa, which makes it one of the most robust and durable steels available. Weldox 690 is also notable for its excellent impact resistance, low-temperature toughness, and resistance to dynamic loading.

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 690 Physical Properties

In addition to its impressive mechanical properties, Weldox 690 also possesses specific physical properties that give it a competitive edge in various ways. For example, it has rigidity, which means it can withstand heavy loads without deformation. It also has a low thermal expansion coefficient, which makes it a good choice for applications where dimensional stability is important. Additionally, Weldox 690 has good thermal conductiviical conductivity, making it a valuable material in applications that requirequiringipation or electrical conduction.

Weldox 690 Equivalent

Thickness mm – 5 (5 )- (10) 10- (20) 20 – (40) 40 – (80) 80 – (100) 100 – 160
Weldox 690: 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 690 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 690Uses

Thanks to is a popular choice for a wide range of heavy-industry applications. Thanks to its exceptional strength, toughness, and durability, it is widely used in mining equipment, construction machinery, and oil and gas drilling platforms. Weldox 690 is prized for its ability to withstand high-impact loading stresses, making choices for components such as conveyor belts, hammers, and wear plates. Weldox 690 is also a popular choice for crane construction, where its high strength-to-weight ratio and fatigue resistance make it an excellent material for load-bearing components.

Weldox 690 Corrosion Resistance

One of the critical benefits of Weldox 690 is its excellent resistance to corrosion resistances-ures. It can withstand harsh and challenging environments without succumbing to rust or other forms of corrosion. This makes it an ideal choice for applications where core with critical decline resistance offshore platforms, mining equipment, and construction machinery. Weldox 690 has exceptional resistance to stress corrosion cracking, a problem in many materials exposed to corrosive environments.

Weldox 690 Heat Treatment

Achieving this requires specific heat treatment procedures. After we complete the desired strength and toughnesslding or hot forming, it may be necessary to perform post-weld heat treatment to restore the optimal properties of the steel. This typically involves heating the material to a temperature between 580–680℃ and subjecting it to slow cooling in a furnace or air. Proper heat treatment is critical to ensure the fabric maintains high strength and toughness while avoiding embrittlement or deformation.

Weldox 690 Machining

While Weldox 690 is known for its exceptional strength and durability, it is also highly machinable when used with the proper tools and techniques. It is best to use more complex cutting tools with a low rake angle and high cutting speed to achieve a clean and precise cut. Special care should be taken to avoid excessive heat build-up during machining, which can cause deformation or change the material’s microstructure. To prevent damage to cutting tools, it is also essential to ensure the material is uniformly hardened and free from surface defects before starting the machining process.

Weldox 690 Welding

Weldox 690 is a high strength-strength steel designed for use in welding construction. This material has superior weldability compared to other standard steels and offers excellent fatigue properties, with yield strengths up to 690 MPa. AdditionalItsability makes it an ideal choice for fabricating large or complex components.


Weldox 690 is a remarkable material that offers exceptional strength, toughness, and durability, making it a popular choice for heavy-duty applications in mining, construction, and other challenging industries. Its unique chemical composition, combined and mechanical and physical properties, make it n ideal choice for components that must withstand dynamic loads, high wear, and harsh environments. By understanding the properties, uses, and machining techniques of Weldox 690, designers, engineers, and fabricators can unlock its full ptheirntial and create innovative and reliable solutions for complex industrial challenges.

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