Boiler tube for 700 DEG C steam parameter thermal power generating unit and preparation method thereof
A thermal power unit, steam parameter technology, applied in the direction of furnace, furnace type, heat treatment furnace, etc., can solve the problem of catastrophic impact on high-temperature durability of materials, and achieve the effect of improving the bonding strength
Active Publication Date: 2015-04-29
CENT IRON & STEEL RES INST
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[0005] The purpose of the present invention is to provide a 700°C steam parameter boiler tube for a thermal power unit and its preparation method, which overcomes the impact of the improved Inconel740H alloy at part of the grain boundary during the long-term aging process at 750°C on the high-temperature durability of the material The problem of catastrophic impact
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[0051] Application of Grain Boundary Engineering Principle in C-HRA-1 Alloy Tube Manufacturing
[0052] The concept of grain boundary engineering (Grain boundary engineering, GBE) was first proposed by T. Watanabe in 1984. This theory is mainly aimed at face-centered cubic metals or alloys through deformation heat treatment (cold deformation plus annealing) to improve the superposition of materials. The proportion of the grain boundary of the position lattice (Coincidence site lattice), thereby improving certain properties related to the material and the grain boundary, such as intergranular stress corrosion resistance, creep resistance, etc. The coincident position lattice grain boundary is also called Σ grain boundary, and the Σ value is the reciprocal of the overlap ratio of grain lattices on both sides of the grain boundary. For example, the overlap ratio of grain lattices on both sides of the Σ3 grain boundary is 1 / 3. The smaller the Σ value, the higher the coincidence ra...
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The invention discloses a boiler tube for a 700 DEG C steam parameter thermal power generating unit and a preparation method thereof and belongs to the technical field of heat resisting alloys. The boiler tube comprises the chemical components in percent by weight: 23.5-25.5 percent of chromium, 18.0-20.0 percent of cobalt, 1.2-1.5 percent of niobium, 1.4-1.8 percent of aluminum, 0.8-1.4 percent of titanium, less than or equal to 1.0 percent of manganese, 0.01-0.03 percent of carbon, less than or equal to 0.002 percent of boron, 0.03-0.08 percent of zirconium, the balance of nickel and a small amount of impurity elements and hydrogen and oxygen elements as low as possible. Steel ingots or electrode rods can be smelted by employing the VIM+VAR or VIM+ESR process flow. The boiler tube has the advantages that the 750 DEG C long lasting endurance strength and impact toughness of the alloy are far higher than the Incone 1740H alloy, and the alloy is a heat-resistant alloy which has the best comprehensive performance up to now and is suitable for manufacturing the boiler tube for the 700 DEG C steam parameter thermal power generating unit.
Description
technical field [0001] The invention belongs to the technical field of heat-resistant alloys, and in particular provides a boiler tube for a 700°C steam parameter thermal power unit and a preparation method thereof, which can be used as a nickel-based heat-resistant alloy (C-HRA) for a 700°C steam parameter ultra-supercritical thermal power unit -1) and its boiler tube preparation. Involving its optimal chemical composition range, optimal thermal processing process and deformation-heat treatment process, it is suitable for the manufacture of advanced ultra-supercritical thermal power unit boiler tubes and related pipes. Background technique [0002] With the ever-increasing energy demand and increasingly serious environmental protection issues, improving power generation efficiency has become an important issue that cannot be ignored. my country's natural resources and national conditions determine that thermal power generation with coal-fired generating units as the absolu...
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IPC IPC(8): C22C19/05C22C30/00C21D8/10C21D9/08
Inventor 刘正东崇严包汉生徐松乾王立民杨钢翁宇庆干勇
Owner CENT IRON & STEEL RES INST