13CrMo4-5, 1.7335 – Heat-resistant steel

Grade 13CrMo4-5 steel, also known as 1.7335, is a medium carbon-chromium alloy steel with molybdenum addition. This steel is characterized by an excellent combination of mechanical properties and resistance to high temperatures and pressure. These features make it ideal for a wide range of industrial applications.

Heat-resistant ASTM A182 F12 Class 2 steels have been a part of steel production for decades. This material with a medium carbon content is alloyed with silicon, manganese, chromium, and molybdenum. This ensures excellent mechanical properties, such as strength and toughness, while also providing corrosion resistance. These ASTM A182 F12 Class 1 steels are highly weldable without the risk of crack formation. This makes them suitable for the production of pressure vessels, boilers, heat exchangers, as well as for pipes and vessels in the chemical and petrochemical industries.

Rolled round bars with a bar diameter of 16 mm to 300 mm in stock. Round bars, forged up to diameter 400 mm in stock. Bar diameters larger than 400 mm on request. Drawn bars of smaller diameters on request.

Composition of steel 13CrMo9-10, 1.7335

Grade 13CrMo9-10 steel, also known as 1.7380, is an alloy steel with the following chemical composition:

• Carbon (C): 0.08–0.15%
• Silicon (Si): max. 0.50%
• Manganese (Mn): 0.40–0.70%
• Phosphorus (P): max. 0.025%
• Sulphur (S): max. 0.010%
• Chromium (Cr): 2.00–2.50%
• Molybdenum (Mo): 0.90–1.20%

Mechanical properties

13CrMo4-5, 1.7335 steel is known for its high strength and toughness. Thanks to its chromium and molybdenum content, this steel has excellent resistance to corrosion and oxidative wear. Its mechanical properties include:

• Tensile strength: 450–600 MPa
• Yield strength: min. 280 MPa
• Ductility: min. 20%
• Impact strength: 41 J at 20 °C
• High temperature applications: up to 600 °C
• Hardness (HB): 170–210

Thermal properties

13CrMo4-5 is designed to withstand high temperatures up to 550 °C without losing its mechanical properties. This steel is used in environments where cyclic temperature changes occur, thanks to its ability to maintain structural integrity. It can withstand thermal fatigue.

Resistance to corrosion

The presence of chromium in 13CrMo4-5 steel provides corrosion protection, while molybdenum increases resistance to pitting corrosion. This combination makes 13CrMo4-5 steel ideal for applications where long service life and minimal maintenance are emphasized.

Weldability

13CrMo4-5 steel has good weldability, allowing it to be easily integrated into complex structures without the risk of cracks or other deformations. However, specific preheating and cooling procedures must be followed when welding this steel to maintain its mechanical properties.

Application in industry

13CrMo4-5 steel is known for its excellent weldability, enabling seamless integration into complex structures without the risk of cracks or other deformations. When welding this steel, it is essential to follow specific preheating and cooling procedures to maintain its mechanical properties.

Energy and power industry

13CrMo4-5 steel is widely used in the energy industry, especially in the production of steam boilers, pressure vessels, and heat exchangers. These applications require high resistance to thermal and pressure cycles.

Chemical industry

Due to its resistance to corrosion and oxidative wear, steel 13CrMo4-5 is preferred in the chemical industry for equipment that comes into contact with aggressive chemicals. This includes reactors, distillation columns, and piping systems.

Petrochemistry

In the petrochemical sector, steel 13CrMo4-5 is used for the production of pipes, tanks, and other components that must withstand high temperatures and corrosive environments. This contributes to the safety and efficiency of manufacturing processes.

Standards and specifications

13CrMo4-5, 1.7335 steel is specified to several international standards, ensuring its quality and applicability in a variety of industries. One of the standards is the former Czechoslovak ČSN 15121, which describes the chemical composition and mechanical properties of this steel. This facilitates its selection and use in appropriate applications.

Grade 13CrMo4-5, 1.7335 steel offers an excellent combination of mechanical and thermal properties, corrosion resistance, and good weldability. Due to these properties, it is an ideal choice for a wide range of industrial applications. This includes the energy, chemical, and petrochemical industries. ČSN 15121 ensures that the steel meets all requirements for specific applications, which contributes to its popularity and wide use in industry.