Seamless steel pipe for high-pressure boiler

Abstract

The invention discloses a seamless steel pipe for a high-pressure boiler. The seamless steel pipe comprises a steel pipe main body, a first endurance strength protection layer, a second endurance strength protection layer, a first oxidation corrosion resisting layer, a second oxidation corrosion resisting layer, a first tissue stable layer and a second tissue stable layer, wherein the first tissue stable layer, the first endurance strength protection layer, the first oxidation corrosion resisting layer and the second oxidation corrosion resisting layer are arranged on the inner wall of the steel pipe main body in sequence; the second tissue stable layer and the second endurance strength protection layer are arranged on the outer wall of the steel pipe main body in sequence. Through adopting the method, the seamless steel pipe is high in endurance strength, high in oxidation corrosion resistant property and good in tissue stability, and can be used under high-temperature and high-pressure conditions in long-term.

Description

technical field [0001] The invention relates to the field of steel pipes, in particular to a seamless steel pipe for high-pressure boilers. Background technique [0002] Generally, the operating temperature of boiler tubes is below 450°C, and domestic tubes are mainly made of No. 10 and No. 20 carbon-structured steel hot-rolled or cold-drawn tubes. High-pressure boiler tubes are often under high-temperature and high-pressure conditions when used, and the tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. stability. [0003] General boiler tubes are mainly used to manufacture water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam tubes, etc. of high-pressure and ultra-high pressure boilers. [00...

AI Technical Summary

Problems solved by technology

[0004] However, the current seamless steel pipes for high-pressure boilers do not have high durable strength, high oxidation resistance, and good structural stability, and cannot meet the standards for long-term use under high temperature and high pressure conditions.