Hot-rolled steel plate for vacuum train pipe
By using hot-rolled steel plates with specific alloy composition and microstructure control, the shortcomings of vacuum train pipeline materials in terms of workability, degassing rate and safety have been solved, achieving high strength, low temperature toughness and excellent vibration damping ratio, ensuring the structural stability and safety of vacuum train pipelines.
Patent Information
- Application Number
- CN202480067988.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-12-13
- Filing Date
- 2024-12-10
- Publication Date
- 2026-05-26
AI Technical Summary
Existing vacuum train piping materials have shortcomings in terms of processability, degassing rate, and safety, especially under ultra-high speed operating conditions, making it difficult to guarantee the safety of passengers and surrounding facilities.
Hot-rolled steel sheets with a specific alloy composition include C: less than 0.06%, Si: 0.5-1.5%, Mn: 1.2-2.2%, Cu: 0.5-1.5%, Ni: more than 0.25%, Ti+Nb+V: less than 0.02%, the balance being Fe and unavoidable impurities. The microstructure contains more than 90% polygonal ferrite and less than 10% pearlite. The microstructure of Cu precipitates and welded parts is controlled to achieve excellent yield strength, weldability, vibration damping ratio and low-temperature toughness, while avoiding hot cracking.
It achieves high strength, low-temperature toughness, and excellent vibration damping ratio, ensuring the structural stability and safety of the vacuum train pipeline. At the same time, it is free from thermal cracks during the manufacturing process and is easy to process into pipeline shape.