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Smelting method for improving metallurgical quality of Ni-Cr electrothermal alloy

A technology of electrothermal alloy and smelting method, which is applied in the field of smelting and smelting to improve the metallurgical quality of Ni-Cr electrothermal alloy, and can solve the problems of undisclosed electroslag remelting smelting parameters and control points, etc.

Pending Publication Date: 2022-03-04
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Problems solved by technology

[0003] Chinese patent: Hua Dafeng, Wang Shuping, a new type of high-resistance electrothermal alloy material and its preparation method: China: CN102191409A[P], 2011.09.21 disclosed a new type of Ni-Cr high-resistance electrothermal alloy material and its preparation method, The disclosure shows that the preparation method of its electrothermal alloy billet mainly adopts the process of "medium frequency induction furnace smelting + electroslag remelting", which is different from the route "vacuum induction furnace smelting + electroslag remelting" used in the present invention, and its patent The specific smelting parameters and control points of electroslag remelting are not disclosed
[0004] Chinese patent: Guo Jian, Guo Xiaofang, Guo Nailin, A method for reducing non-metallic inclusions in Ni-Cr-Fe electric heating alloy: China, CN103952518B[P], 2016.05.04 discloses the preparation of a Ni-Cr-Fe electric heating alloy Method, the opening content shows that the preparation method of the electrothermal alloy blank only adopts the "vacuum induction furnace smelting" process, which is different from the route "vacuum induction furnace smelting + electroslag remelting" adopted by the present invention
Moreover, the vacuum induction melting process parameters and control points disclosed in the patent are quite different from those of the present invention.

Method used

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specific Embodiment

[0035] The invention mainly aims at the deficiency of the existing production technology, and provides a smelting method which is beneficial to improving the metallurgical quality of the Ni-Cr electrothermal alloy. The method can significantly reduce the content of harmful impurity elements in the Ni-Cr alloy material, improve the shape and distribution of inclusions, and further improve the machinability and service performance of the material.

[0036] A smelting method beneficial to improving the metallurgical quality of Ni-Cr electrothermal alloy, said method comprising vacuum induction smelting and protective atmosphere electroslag remelting double smelting process

[0037] The specific smelting method mainly includes the following steps:

[0038] 1. Ingredients: Dosing according to the following composition (mass percentage): C≤0.05%, Si 0.9-1.60%, Al≤0.50%, Cr 20.0-22.0%, Mn≤0.3%, Fe≤1.0%, P≤0.010 %, S≤0.010%, Ti≤0.01%, Zr 0.1-0.25%, Re≤0.2%, and the balance is Ni and ...

Embodiment 1

[0048] Further set forth and understand the present invention below by embodiment:

[0049] Prepare the Cr20Ni80 electrothermal alloy blank of embodiment according to the following method:

[0050] (1) Batching: Batching according to the following composition, C-0.035%, Si-1.30%, Al-0.6%, Cr-21%, Mn-0.15%, Fe-0.5%, P≤0.010%, S≤0.010% , Ti≤0.01%, Zr-0.2%, Re-0.15%, the balance is Ni and unavoidable impurities, and the total weight of ingredients is about 1.2 tons.

[0051](2) Vacuum smelting: charging: the raw materials used are cleaned and dried to remove oil and moisture. When charging, a layer of fine light materials is laid on the bottom of the furnace, and Al, Zr, Mn and rare earth are loaded into the grid. device. (2) Melting: After charging is completed, close the vacuum chamber and start vacuuming. When the vacuum is lower than 7.6Pa, power is supplied to heat and melt the charge. In order to ensure the removal of gas and non-metallic inclusions, the melting rate is c...

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Abstract

The invention discloses a smelting method for improving the metallurgical quality of a Ni-Cr electrothermal alloy, and belongs to the technical field of metallurgical production processes. According to the smelting method for improving the metallurgical quality of the Ni-Cr electrothermal alloy, the content of harmful impurity elements in a Ni-Cr alloy material can be effectively reduced, the form and distribution of inclusions are improved, and the machinability and the use performance of the material are improved. The smelting method at least comprises the two steps of vacuum induction smelting and electroslag remelting, the melting point of vacuum induction smelting is obtained through calculation according to the following formula: T melting point = 1453-61.7 [C]-13.2 [Si]-3.6 [Mn]-1.6 [Cr]-5 [Al]-0.75 [Fe]-5.3 [Zr]-5.9 [Re]-35 [P]-32.3 [S]-11.1 [Ti], and X in [X] in the formula is a corresponding chemical component; the voltage U and the current I of electroslag remelting are respectively calculated according to the following empirical formulas: U is equal to 0.8 D crystallizer + 25, D crystallizer is the diameter of the crystallizer in the formula and the unit is cm, I is equal to 7.5 d electrode * (55-0.5 d electrode), and d electrode is the diameter of an electrode bar in the formula and the unit is cm.

Description

technical field [0001] The invention relates to a smelting method, in particular to a smelting method for improving the metallurgical quality of Ni-Cr electrothermal alloy, and belongs to the technical field of metallurgical production technology. Background technique [0002] Electrothermal alloy is a functional alloy material that uses material resistance to generate Joule heat to convert electrical energy into heat energy. It is mainly used to make electric heating elements in the range of 500°C to 1400°C. According to the chemical composition, electric heating can be divided into three categories: Ni-Cr system, Ni-Cr-Fe system and Fe-Cr-Al system alloy. Among them, the Ni-Cr series electric heating alloy is usually an austenite single-phase structure, which has some advantages such as high high temperature strength, no high temperature brittleness, stable electrical resistance, low thermal expansion coefficient, etc., and has excellent cold and hot workability and weldin...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C19/05C22B9/18
CPCC22C1/023C22C19/05C22B9/18Y02P10/25
Inventor 陈文雄张军武雪婷尹仕伟
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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