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A production process of tube billet alloy cn617 for ultra-supercritical thermal power units

A thermal power unit, ultra-supercritical technology, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of unfavorable hot processing of finished ingots, influence, and the range of parameters cannot be specific to actual production, etc.

Active Publication Date: 2016-09-14
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty in the development of CN617 alloy lies in the process design of industrial production (selecting a suitable smelting method), to ensure the composition and the hot workability of the finished ingot; the relevant literature introduces the composition range and performance parameters of the 617 alloy, and the range of parameters is too wide to be specific. In actual production; there are many smelting methods for 617 alloy proposed in relevant foreign literature, including vacuum induction smelting, or vacuum induction smelting plus electroslag remelting. Both will have adverse effects on the thermal processing of finished ingots

Method used

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  • A production process of tube billet alloy cn617 for ultra-supercritical thermal power units
  • A production process of tube billet alloy cn617 for ultra-supercritical thermal power units
  • A production process of tube billet alloy cn617 for ultra-supercritical thermal power units

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Experimental program
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Effect test

Embodiment 1

[0033] The technological measure that embodiment 1, embodiment 2 and embodiment 3 carry out jointly:

[0034] ① Alloy CN617 chemical composition distribution and control;

[0035] ② Calculate the amount of various returned steel and alloy materials required for smelting according to the alloy composition control requirements. Metal nickel, metal cobalt, metal chromium, metal molybdenum, metal aluminum, metal titanium, graphite electrodes and other materials are selected. Among them, the metal nickel and metal cobalt should be pre-treated to remove the surface film; the return material should be melted in advance, and the chemical composition is accurate. The raw materials of the furnace are kept clean and free of oil;

[0036] ③ Vacuumize to ensure that the vacuum degree is ≤10Pa; load the materials into the furnace in batches, and feed the electrochemical materials after loading the first batch of materials;

[0037] ④The charging sequence should follow the pure metal first...

Embodiment 2

[0057] Production of CN617B alloy, furnace number: 14240 170142, crucible capacity: 6 tons, ingot weight: 5448kg.

[0058] ①The composition of CN617 alloy is formulated and controlled according to Table 3;

[0059] ③Vacuumize, from low vacuum to high vacuum (10Pa to 2Pa). During this process, due to the melting and degassing of raw materials, the vacuum fluctuates continuously. Sampling and analysis of gas is used to monitor the gas change in molten steel;

[0060] [④ Loading sequence: Ni plate, metal Cr, Co plate, metal Mo, etc.;

[0061] ⑥After 7 hours of full melting, the full melting temperature is 1510°C;

[0062] ⑧The tapping temperature is 1490℃ for pouring;

[0063] The chemical composition and harvest of each stage are shown in Table 6.

[0064] Table 6%

[0065]

[0066] Finished gas: H: 1.3×10 -6 , O: 10×10 -6 , N: 20×10 -6 .

Embodiment 3

[0068] Production of Ni-Cr19-Co12-Mo9 alloy forging materials, furnace number 12242 210342, crucible capacity: 1 ton, ingot weight 976kg.

[0069] like figure 1 as shown,

[0070] ①Ni-Cr19-Co12-Mo9 alloy composition is formulated and controlled according to Table 2;

[0071] ③Evacuation vacuum degree reaches 8Pa and continuously deflates and degasses to complete melting with the melting of raw materials;

[0072] ④ Loading sequence: Ni plate, master alloy, metal Cr, Mo, Co;

[0073] ⑥Add Ta at the same time as the seasoning after full melting, stir for 20 minutes, and the result of full melting gas is O: 7×10 -6 , N:85×10 -6 , stirring and degassing during the refining process, the gas result O: 10×10 -6 , N:20×10 -6 The chemical composition analysis results of the finished product are shown in Table 7;

[0074] ⑨The pouring process controls the pouring speed, the pouring time is 2min, the pouring temperature is 1480°C, and one electrode is poured,

[0075] Table 7%

...

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Abstract

The invention discloses a production technology of a tube blank alloy CN617 for an ultra-supercritical thermal power unit. The production technology realizes industrial trial-manufacture and satisfies hot-working use requirements. Vacuum induction furnace smelting comprises the following steps of material blending, material preparation, vacuum-pumping, charging, power supplement, charging, total melting, stirring, standing, component adjustment and pouring. The production technology utilizes a unique chemical composition ratio, trace elements and reasonable technological parameters. The production technology has the advantages that 1, an industrial production design is realized, in other words, an appropriate smelting method is selected so that good hot-working performances of chemical components and a finished product ingot are guaranteed, and the tube blank alloy CN617 has good performances and a wide purpose, and 2, at present, the CN617 alloy is in a laboratory test stage and cannot be used in industrial production, and the production technology provided by the invention can be successfully used in small-scale industrial production and has batch production feasibility.

Description

technical field [0001] The invention belongs to the field of nickel-based high-temperature alloy materials, and relates to a production process of tube blank alloy CN617 for ultra-supercritical thermal power units. Background technique [0002] At present, coal-fired power generation accounts for nearly 80% of my country's main energy generation capacity, and the installed capacity structure of power generation must be gradually adjusted to new energy and clean energy. The power supply efficiency of the 700°C ultra-supercritical coal-fired power generation technology will increase to 50%, the coal consumption per kilowatt-hour can be reduced by nearly 70 grams, and the carbon dioxide emission will be reduced by 14%, which is the development path of clean coal-fired power generation technology. In 2010, my country established the National 700°C Ultra-supercritical Coal-fired Power Generation Technology Innovation Alliance and launched the "PCR700" program. Many key component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C19/05C22B9/04
CPCY02P10/25
Inventor 张鹏张玉春王志刚李爱民杨玉军杨晓利李宁田水仙王洋洋刘猛王树财王艾竹朱洪涛刘正东包汉生陈璐珂于杰闫森
Owner FUSHUN SPECIAL STEEL SHARES