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12Cr1MoVG boiler steel pipe is a low-alloy heat-resistant steel pipe specifically developed for medium- and high-pressure boiler systems. It is designed to perform reliably under high temperature, high pressure, and complex chemical environments, making it a widely used material in power plant boilers. This article will introduce properties of 12Cr1MoVG boiler steel pipes.
Mechanical Properties of 12Cr1MoVG Boiler Steel Pipes
- High Strength
12Cr1MoVG steel pipe offers a minimum yield strength of≥255 MPa and a tensile strength range of 470–640 MPa. This strength level enables the pipe to withstand high internal pressures from steam and hot water, effectively preventing deformation such as bulging or rupture during long-term operation.
- Good Toughness
The material exhibits excellent impact toughness, reducing the risk of brittle fracture under sudden loads, thermal shock, or water hammer. This property ensures pipeline integrity and supports continuous, safe boiler operation.
- High-Temperature Performance
High-Temperature Creep Resistance
12Cr1MoVG demonstrates stable creep behavior at operating temperatures up to 580°C. Its low creep deformation rate helps maintain dimensional stability during prolonged high-temperature service, which is critical for boiler components exposed to constant thermal stress.
Oxidation Resistance
At elevated temperatures, 12Cr1MoVG forms a dense and adherent oxide film on the surface. This protective layer slows further oxidation, preserves mechanical properties, and minimizes wall thinning caused by scale formation and peeling.
- Chemical and Corrosion Resistance
General Corrosion Resistance
Boiler media may contain trace acidic or alkaline substances. 12Cr1MoVG steel provides reliable resistance to general corrosion, reducing pitting and uniform corrosion and extending service life.
Hydrogen Corrosion Resistance
In high-temperature steam environments containing hydrogen, some steels suffer from hydrogen embrittlement. 12Cr1MoVG exhibits strong resistance to hydrogen-related damage, maintaining toughness and structural reliability.
- Processing and Fabrication Performance
Weldability
With appropriate welding procedures and compatible filler materials, 12Cr1MoVG boiler steel pipes achieve weld joints with strength and toughness close to the base metal. The heat-affected zone remains stable under high-temperature and high-pressure conditions.
Cold Workability
Although classified as an alloy steel, 12Cr1MoVG allows limited cold working, such as cold bending. This improves flexibility during on-site installation and enables adaptation to complex boiler piping layouts.
Typical Applications of 12Cr1MoVG Boiler Steel Pipe
Due to its balanced mechanical strength, thermal stability, and corrosion resistance, 12Cr1MoVG is commonly used in:
Boiler heating surface tubes
Headers and manifolds
Main steam pipes
Medium- and high-pressure power plant boilers
FAQ
Q1: What is 12Cr1MoVG boiler steel pipe used for?
A1: It is mainly used for heating surface tubes, headers, and steam pipelines in medium- and high-pressure boilers.
Q2: What temperature can 12Cr1MoVG withstand?
A2: It is suitable for long-term service at temperatures up to approximately 580°C.
Q3: Does 12Cr1MoVG have good creep resistance?
A3: Yes, it has low creep deformation rates under high-temperature conditions.
Q4: Is 12Cr1MoVG resistant to hydrogen corrosion?
A4: Yes, it shows strong resistance to hydrogen embrittlement in steam environments.
Q5: Can 12Cr1MoVG boiler pipes be welded easily?
A5: Yes, with proper welding procedures, it achieves stable weld quality and reliable joint performance.
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