CN-122012993-A - High-temperature corrosion-resistant high-temperature alloy and preparation method thereof

Abstract

The embodiment of the invention provides a high-temperature corrosion-resistant high-temperature alloy and a preparation method thereof, relating to the technical field of metal structural materials, and comprising the following steps: the nickel-based wrought superalloy comprises, by weight, 0.04-0.08% of C, 28.5-29.5% of Cr, 10.0-12.0% of W, 3.0-5.0% of Mo, 1.0-1.5% of Al, 0.5-0.8% of Ti, less than or equal to 1% of Fe, 0.8% of Si and the balance of Ni. The deformation high temperature is solid solution strengthening type nickel-based oxidation resistant high temperature alloy, and the alloy density is 8.88g/cm 3 . The high-temperature alloy designed by the invention is mainly used for sintering key parts of a coke reactor, ensures high temperature resistance, oxidation resistance, CO resistance and tar corrosion resistance at the use temperature, and has very good plasticity and excellent welding performance.

Inventors

• LIU PENG
• LIU HENG
• YANG ZHEN
• CAO YANG
• YIN HONGFEI
• LI PEI
• Fan Kaifa
• XIE BEIBEI
• XU PENGJIANG
• YUAN YONG
• YAN JINGBO
• ZHANG HUAN
• Huang Guanshuo
• Ding Kailun
• ZHANG PENG

Assignees

• 西安热工研究院有限公司
• 中国华能集团有限公司

Dates

Publication Date

20260512

Application Date

20260302

Claims (7)

1. 1. The high-temperature corrosion-resistant superalloy is characterized by comprising, by weight, 0.04-0.08% of C, 28.5-29.5% of Cr, 10.0-12.0% of W, 3.0-5.0% of Mo, 1.0-1.5% of Al, 0.5-0.8% of Ti, less than or equal to 1% of Fe, 0.8% of Si and the balance of Ni.
2. 2. The high-temperature corrosion-resistant superalloy according to claim 1, wherein the wrought superalloy contains 29-29.5 wt% Cr.
3. 3. The high temperature corrosion resistant superalloy according to claim 1 wherein the sum of w+mo weight percent of the wrought superalloy is 15-17%.
4. 4. The high-temperature corrosion-resistant superalloy according to any of claims 1 to 3, wherein the wrought superalloy comprises 1.3-2 wt% al+ti.
5. 5. A method for preparing a high temperature corrosion resistant superalloy, characterized in that the superalloy is as defined in any of claims 1 to 4, comprising the steps of: step 1, annealing treatment, namely preserving the heat of the cast ingot after hot rolling and cogging at 1200-1250 ℃ for 5-30min, and then cooling the cast ingot to room temperature by water; step 2, deforming, namely performing cold deformation with the total deformation amount of 60-80% on the annealed plate, adopting multi-pass pressing, wherein the pressing rate of each pass is 20-25%, and lubricating the plate through emulsion; And 3, carrying out solution treatment, namely preserving the heat of the cold-rolled sheet for 2-4 hours at 1140-1160 ℃, air-cooling to room temperature, and drying by acid washing.
6. 6. The method for preparing a high-temperature corrosion-resistant superalloy according to claim 5, wherein the texture of the high-temperature corrosion-resistant superalloy prepared is single-phase austenite and a small amount of MC and M23C6 type carbide, and the average grain size is not more than 100. Mu.m.
7. 7. The method for producing a high-temperature corrosion-resistant superalloy according to claim 5, wherein the oxidation rate of the produced high-temperature corrosion-resistant superalloy at 900 ℃ is 0.0573 g/(m 2 .h), and the oxidation rate at 1000 ℃ is 0.113 g/(m 2 .h).

Description

High-temperature corrosion-resistant high-temperature alloy and preparation method thereof Technical Field The embodiment of the invention relates to the technical field of metal materials, in particular to a high-temperature corrosion-resistant high-temperature alloy and a preparation method thereof. Background Coke is the most important base material in blast furnace smelting. In recent years, with the development and progress of blast furnace smelting technology, particularly the large-scale blast furnace volume, high wind temperature technology and rapid development of blast oxygen-enriched coal injection technology, coke is used as a material column framework in the blast furnace to ensure that the ventilation and liquid permeation in the furnace are more outstanding. The quality of coke, particularly coke reactivity and strength after reaction have great influence on the modern blast furnace smelting process, become key factors for limiting the stable, balanced, high-quality and efficient production of molten iron of a blast furnace, the importance of the blast furnace is known and parameter indexes of the blast furnace are depended on to reach unprecedented heights in the iron-making and coking industries, and the NSC method is used for daily detection of coke reactivity and melting loss resistance, and a high-temperature alloy welded pipe is adopted for the detection of sintering key parts of the reactor, so that the high-temperature alloy welded pipe has high temperature resistance, oxidation resistance, CO resistance and tar corrosion resistance, and has very good plasticity and excellent welding performance. The coke reactivity and post-reaction strength measuring device is mainly used for measuring the reactivity and post-reaction strength of the coke required by blast furnace ironmaking. The accuracy of the test data is critical to the stable operation of the blast furnace. The selected high-temperature alloy has the characteristics that 1, the Cr content is high enough and is usually about 20 percent, an oxide film mainly comprising Cr 2O3 is formed in an oxidation environment of a part, the alloy has good oxidation resistance and heat corrosion resistance, 2, refractory metal elements are added for solid solution strengthening, a certain amount of Mo, W or Co is added for solid solution strengthening, the solid solution strengthening elements generate lattice distortion, deformation length, short-range stress field, short-range order or atomic segregation area, the strength of the alloy from room temperature to high temperature is improved in a mode of improving the binding force among atoms and the like, 3, the C content is controlled, the reasonable C content is added for strengthening the grain boundary, the lasting strength of the alloy is improved, 4, the selected high-temperature alloy mainly comprises Ni base, secondly Co base and the Ni base high-temperature alloy has stable austenitic structure and good oxidation resistance and corrosion resistance. The high-temperature alloy steel of the coke reactor (meeting GB/T4000-2008) materials in use at present is GH23 or GH44. The GH44 alloy is a solid solution strengthening nickel-based oxidation resistant alloy, contains higher Cr (23.5-26.5%) and W (13.0-16.0%), has high plasticity and medium heat resistance below 900 ℃, has excellent oxidation resistance and good stamping and welding process performances, and is suitable for manufacturing plate stamping and welding structural parts, mounting edges, guide pipes, guide vane parts, heat shields, guide vanes and the like of a main combustion chamber and an afterburner of an aeroengine working below 900 ℃ for a long time. Therefore, the selection of high-temperature alloy steel for the reactor is reasonable. However, with the deep research of the reactivity of the coke and the strength after the reaction, the thermal performance of the coke under the condition of alkali metal corrosion is researched, and the high-temperature resistant alloy steel reactor in GB/T4000-2008 has poor alkali metal corrosion resistance. Disclosure of Invention The embodiment of the invention aims at solving at least one of the technical problems existing in the prior art and provides a high-temperature corrosion-resistant high-temperature alloy and a preparation method thereof. In a first aspect, the embodiment of the invention provides a high-temperature corrosion-resistant superalloy, which comprises, by weight, 0.04-0.08% of C, 28.5-29.5% of Cr, 10.0-12.0% of W, 3.0-5.0% of Mo, 1.0-1.5% of Al, 0.5-0.8% of Ti, less than or equal to 1% of Fe, 0.8% of Si and the balance of Ni. Further, the weight percentage content of Cr in the wrought superalloy is 29-29.5%. Further, the sum of the weight percentage of W+Mo of the deformation superalloy is 15-17%. Further, the weight percentage content of Al+Ti of the wrought superalloy is 1.3-2%. In a second aspect, an embodiment of the present invention provides a method for pre