Method for adding rare earth to T91 and P91 steel for improving high temperature corrosion resistance

A T91, high temperature resistance technology, applied in the field of adding rare earth to improve high temperature corrosion resistance, can solve the problems of practical application limitations, difficult implementation of the inner wall of the pipeline, etc. Effect
CN102321839AInactive Publication Date: 2012-01-18NANCHANG HANGKONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANCHANG HANGKONG UNIVERSITY
Publication Date
2012-01-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for adding rare earth to T91 and P91 steel for improving the high temperature corrosion resistance. The method comprises steps that: during a T91 and P91 steel smelting procedure, rare earth and / or corresponding oxides of rear earth are added to the steel, such that rear earth is dispersed in T91 steel. With the steps, T91 and P91 steel containing rear earth is prepared. The technical effects of the invention are that: 1, the T91 and P91 steel with the additive provided by the invention has excellent high-temperature vapor oxidation resisting capacity, and the oxidation speed of the type of material can be substantially reduced. When oxidized for 150 hours with a constant temperature under an environment of vapor with a temperature of 650 DEG C, an oxidation mass gain of a blank sample reaches 8.53mg / cm<2>, but an oxidation mass gain of a rear-earth-modified sample is only 0.12mg / cm<2>. No surface crack or oxide film exfoliation is found on the rear-earth-modified sample. 2, with the rear-earth-modified T91 and P91 steel provided by the invention, under an environment of high-temperature vapor, an oxide layer containing a large amount of chrome and a small amount of rear earth is formed on the surface of the sample.
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Description

technical field

[0001] The invention relates to a method for improving high-temperature corrosion resistance, in particular to a method for adding rare earth to T91 and P91 steels to improve high-temperature corrosion resistance. Background technique

[0002] With the continuous growth of electricity demand, supercritical and ultra-supercritical units with high steam parameters and high efficiency are the inevitable trend of thermal power development. Due to the increase in boiler equipment capacity and steam parameters in thermal power plants, more and more boiler tube burst accidents have occurred. Statistics show that the leakage damage of the heating surface tubes (water wall tubes, superheater tubes, reheater tubes, economizer tubes, also known as "four tubes") in power plant boiler accidents accounts for about 2 / 3 of boiler accidents. It is the main factor affecting the safe and economical operation of the generating set. Among them, the superheater and reheater, wh...

Claims

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