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Large size ni-cr electrothermal alloy billet and hot working method

An electrothermal alloy, large-scale technology, applied in the field of electrothermal alloy blanks and large-scale Ni-Cr electrothermal alloy blanks, can solve the problems of undisclosed alloy blank size, undisclosed thermal processing parameters and control points, etc., to improve the yield and Final product trial performance, reducing subsequent use costs, and meeting the effects of preparation requirements

Active Publication Date: 2022-07-19
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
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  • 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 size ni-cr electrothermal alloy billet and hot working method

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specific Embodiment

[0026] The main purpose of the present invention is to provide a hot working method for large-scale Ni-Cr electrothermal alloy blanks aiming at the deficiencies of the existing production technology. The method can prepare high-quality and large-scale Ni-Cr electrothermal alloy blanks, meet the preparation requirements of electrothermal devices for high-power industrial electric furnaces, and improve the yield of blanks in the production process.

[0027] In the present invention, "large size" refers to blanks with a single weight exceeding 800kg unless otherwise specified.

[0028] The object of the present invention is mainly achieved through the following technical solutions:

[0029] A hot working method for a large-sized Ni-Cr electrothermal alloy blank, the method mainly comprises the following steps:

[0030] 1. Billet preparation: use vacuum induction melting + electroslag remelting to prepare Ni-Cr electrothermal alloy electroslag round ingots with a unit weight of m...

Embodiment 1

[0036] The scheme of the present invention can be further elaborated and understood by the following examples:

[0037] The large-scale Cr20Ni80 hot working of the embodiment is carried out according to the following method:

[0038] 1. Billet preparation: use vacuum induction melting + electroslag remelting 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 inevitable impurities. The diameter of the ingot after electroslag is 350±10mm.

[0039] 2. Fast forging: (1) Heating: The Ni-Cr electrothermal alloy is heated in stages. The heating rate is about 150°C / h during the heating process. The first stage is heated to 830±10°C and kept for about 2.5h; Then continue to heat up to 1135±10℃, and keep for 4-6h; (2) Forging: the f...

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Abstract

The invention discloses a large-sized Ni-Cr electrothermal alloy blank and a hot working method, belonging to the technical field of metallurgical production technology. Provided are a large-sized Ni-Cr electrothermal alloy blank and a hot working method with relatively high finished product quality and significant reduction in subsequent use costs. The large-sized Ni-Cr electrothermal alloy blank is a superalloy blank containing the following components in parts by weight, and the components in parts by weight are 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%, the balance is Ni and inevitable impurities , Among them, the tensile strength of the finished superalloy material is ≥760MPa, and the elongation rate is ≥55%. The thermal processing method first adopts vacuum induction melting + electroslag remelting to prepare Ni-Cr electrothermal alloy electroslag round ingots with a unit weight exceeding 1.2 tons according to the above-mentioned components in parts by weight, and then sequentially processes the electroslag round ingots. Forging and precision forging, and finally hot rolling to obtain material with a single weight of more than 800kg.

Description

technical field [0001] The invention relates to an electrothermal alloy blank, in particular to a large-sized Ni-Cr electrothermal alloy blank, which belongs to the technical field of metallurgical production technology. The present invention also relates to a hot working method for the large-sized Ni-Cr electrothermal alloy blank. Background technique [0002] Electrothermal alloy is a functional alloy material that utilizes Joule heat generated by material resistance to convert electrical energy into thermal energy. According to chemical composition, it can be divided into three categories: Ni-Cr series, Ni-Cr-Fe series and Fe-Cr-Al series alloys . Among them, Ni-Cr series electrothermal alloy is a commonly used electrothermal alloy with medium temperature and high stability, and its service temperature is mainly 800-1200℃. It has many advantages such as high high temperature strength, no high temperature brittleness, and stable resistance performance. It is often used t...

Claims

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Application Information

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Patent Type & Authority Patents(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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