25Cr2Mo1VA Alloy Structure Steel
Introduction
25Cr2Mo1VA alloy structure steel is high-temperature and creep resistant steel with an improved high-temperature strength, which is suitable for fabrication of parts and components for power plants, such as boiler and turbine structures, piping, heat exchangers and recuperators, used in environments with a temperature range up to 550°C (22°F). This kind of steel is usually used by the power generation sector, chemical industry, and metallurgical industry as well.
Chemical Composition
The main element of 25Cr2Mo1VA alloy structure steel is 25Cr2Mo1VA (%). Other elements in the chemical composition are C (Carbon 0.18-0.25%), Mn (Manganese 0.30-0.51%), Si (Silicon 0.17-0.37%), P (Phosphorus 0.025% max), S (Sulphur 0.015% max), Cr (Chromium 1.50-2.50%) and V (Vanadium 0.18-0.25%).
Physical & Mechanical Properties
The physical properties of 25Cr2Mo1VA alloy structure steel are Density 8.05 g/cm3 observed and Thermal Expansion coeffecient 11.2 x 10-6 cm/cm ⋅C (25C-500C). Mechanical properties of 25Cr2Mo1VA alloy structure steel are Tensile strength 1150 MPa to 1450 MPa, Yield strength 760MPa to 1150 MPa, and Elongation min %12.
Heat Treatment of 25Cr2Mo1VA Alloy Structure Steel
25Cr2Mo1VA alloy structure steel is usually not hardened by heat treatment as it is used in the quenched and tempered state due to the excellent workability after heat treatment. But if needed, the steel can be tempered at the temperature range of 510°C to 780°C. If surface hardening is needed, it can be surface hardened at 880°C to 940°C through quenching and tempering process.
Welding of 25Cr2Mo1VA Alloy Structure Steel
The 25Cr2Mo1VA alloy structure steel can be welded conveniently by shielded metal-arc welding, gas metal-arc welding and submerged arc welding. The weld metal should be preheated to 150 to 200 °C, and the post-weld heat treatment is not necessary.
Applications of 25Cr2Mo1VA Alloy Structure Steel
25Cr2Mo1VA alloy structure steel is mainly used for parts and components for power plants, such as boiler and turbine structures, piping, heat exchangers and recuperators which works in high temperature environment as well as in metallurgical industry, chemical industry and power generation sector.
Conclusion
25Cr2Mo1VA alloy structure steel is a high-temperature, creep-resistant steel with impressive high-temperature strength, which is suitable for power plant parts like boiler and turbine structures, piping and heat exchangers. The steel has chemical composition with elements such as C, Mn, Si, P, S, Cr and V. The physical and mechanical properties of 25Cr2Mo1VA alloy structure steel are Density 8.05 g/cm3 and Thermal Expansion coeffecient 11.2 x 10-6 cm/cm⋅C (25C-500C), and Tensile strength 1150 MPa to 1450 MPa, Yield strength 760MPa to 1150 MPa and Elongation min %12. The steel can be welded using shielded metal-arc welding, gas metal-arc welding and submerged arc welding and can be tempered at 510°C to 780°C if necessary. The 25Cr2Mo1VA alloy structure steel is mainly used for components in power plants and chemical industry, metallurgical industry and power generation sector.
