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Large-specification Ni-Cr electrothermal alloy blank and hot working method

An electrothermal alloy, large-scale technology, applied in the field of electrothermal alloy billets and large-scale Ni-Cr electrothermal alloy billets, can solve the problems of undisclosed alloy billet size, undisclosed hot processing parameters and control points, etc. The final product trial performance, reducing subsequent use costs, and meeting the effect of preparation requirements

Active Publication Date: 2022-02-18
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its patent does not disclose the specific applicable alloy billet size, nor does it disclose specific thermal processing parameters and control points

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  • Large-specification Ni-Cr electrothermal alloy blank and hot working method

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specific Embodiment

[0027] The main purpose of the present invention is to provide a thermal processing method for a large-scale Ni-Cr electrothermal alloy blank in view of the deficiencies of the existing production technology. The method can prepare high-quality large-scale Ni-Cr electric heating alloy blanks, meet the preparation requirements of electric heating devices for high-power industrial electric furnaces, and improve the yield of blanks in the production process.

[0028] "Large size" in the present invention refers to blanks with a unit weight of more than 800kg if not clearly stated.

[0029] The purpose of the present invention is mainly achieved through the following technical solutions:

[0030] A thermal processing method for a large-scale Ni-Cr electrothermal alloy blank, the method mainly includes the following steps:

[0031] 1. Billet preparation: Vacuum induction melting + electroslag remelting is used to prepare Ni-Cr electrothermal alloy electroslag round ingots with a u...

Embodiment 1

[0037] Scheme of the present invention can be further set forth and understood by the following examples:

[0038] Carry out the large scale Cr20Ni80 hot working of embodiment according to the following method:

[0039] 1. Billet preparation: Vacuum induction melting + electroslag remelting is used to prepare Ni-Cr electrothermal alloy electroslag round ingots with a unit weight of more than 1.2 tons. The material composition is controlled as (mass percentage): C≤0.05%, Si 0.9-1.60%, Al≤0.50%, Cr20.0-22.0%, Mn≤0.3%, Fe≤1.0%, P≤0.010%, S≤ 0.010%, Ti≤0.01%, Zr 0.1-0.25%, Re≤0.2%, the balance is Ni and unavoidable impurities. The ingot diameter after electroslag is 350±10mm.

[0040] 2. Fast forging: (1) Heating: During the heating process of Ni-Cr electric heating alloy, it is set to be carried out in stages. The heating rate during the heating process is about 150°C / h. The first stage is heated to 830±10°C, and the heat preservation is about 2.5h; Then continue to heat up to...

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Abstract

The invention discloses a large-specification Ni-Cr electrothermal alloy blank and a hot working method, and belongs to the technical field of metallurgical production processes. According to the large-specification Ni-Cr electrothermal alloy blank and the hot working method, the finished product quality is relatively high, and the subsequent use cost is remarkably reduced. The large-specification Ni-Cr electrothermal alloy blank is a superalloy blank comprising the following components in parts by weight: less than or equal to 0.05% of C, 0.9-1.60% of Si, less than or equal to 0.50% of Al, 20.0-22.0% of Cr, less than or equal to 0.3% of Mn, less than or equal to 1.0% of Fe, less than or equal to 0.010% of P, less than or equal to 0.010% of S, less than or equal to 0.01% of Ti, 0.1-0.25% of Zr, less than or equal to 0.2% of Re and the balance being Ni and inevitable impurities, wherein tensile strength of a finished high-temperature alloy material is larger than or equal to 760 MPa, and ductility is larger than or equal to 55%. The hot working method comprises the following steps: firstly, preparing a Ni-Cr electrothermal alloy electroslag round ingot with the piece weight exceeding 1.2 tons by adopting vacuum induction melting and electroslag remelting according to the components in parts by weight; then carrying out quick forging and precision forging on the electroslag round ingot in sequence; and finally, carrying out hot rolling to obtain a material with the piece weight exceeding 800 kg.

Description

technical field [0001] The invention relates to an electrothermal alloy blank, in particular to a large-scale Ni-Cr electrothermal alloy blank, which belongs to the technical field of metallurgical production technology. The invention also relates to a thermal processing method for the large-scale Ni-Cr electrothermal alloy blank. Background technique [0002] Electrothermal alloy is a functional alloy material that uses the material resistance to generate Joule heat to convert electrical energy into heat energy. According to the chemical composition, it 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 a commonly used electric heating alloy with medium temperature and high stability, and its service temperature is mainly at 800-1200°C. It has many advantages such as high-temperature strength, no high-temperature brittleness, and stable resistance performance. It is often ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05B21J5/00C22B9/18C22C1/02
CPCC22C19/055C22C1/023C22B9/18B21J5/002Y02P10/25
Inventor 陈文雄张军尹凤先张兴勇
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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