High-resistance nickel-chromium electrothermal alloy and production process thereof

A technology of electric heating alloy and production process, applied in the direction of heating element materials, etc., can solve the problem of low resistivity, achieve high resistivity, improve microstructure, and low price

Inactive Publication Date: 2021-02-19
CHANGSHU MEILI ALLOY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the widely used nickel-chromium alloy has the advantages of high melting point, small thermal expansion coefficient and good oxidation resistance, it still has the disadvantage of low electrical resistivity, which needs to be solved urgently.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A production process of a high-resistance nickel-chromium electrothermal alloy, comprising the steps of:

[0025] S1. Send the master alloy ingot into an intermediate frequency induction furnace for smelting for 20 minutes, and vacuumize to 1.8×10 -3 Pa, through high-purity argon to 1×10 4 Pa, the melting temperature is 1500°C;

[0026] Master alloy ingots include by weight percentage:

[0027] Ni: 75.0%, Cr: 22.5%, C: 0.05%, Si: 0.95%, Mn: 0.1%, Al: 0.1%, Fe: 0.3%, Ca: 0.18%, Y: 0.2%, La: 0.05%, Ce: 0.001%, P: 0.002%, S: 0.001%;

[0028] S2. Send the smelted material into the heat treatment furnace, cool down to 900°C at a rate of 20°C / h, and keep the vacuum of the system at 1.8×10 during the cooling process. -3 Pa, heat preservation 1h, hot-rolled wire rod, the deformation of each pass is 6%, the hot-rolling temperature is 1150°C, the starting rolling temperature is 1300°C, the final rolling temperature is 1000°C, and the temperature is lowered to 600°C at a rate ...

Embodiment 2

[0031] A production process of a high-resistance nickel-chromium electrothermal alloy, comprising the steps of:

[0032] S1. Send the master alloy ingot into an intermediate frequency induction furnace for smelting for 40 minutes, and vacuumize to 1×10 -3 Pa, through high-purity argon to 2×10 4 Pa, the melting temperature is 1400°C;

[0033] Master alloy ingots include by weight percentage:

[0034] Ni: 75.0%, Cr: 22.5%, C: 0.08%, Si: 0.8%, Mn: 0.18%, Al: 0.05%, Fe: .45%, Ca: 0.12%, Y: 0.3%, La: 0.01% , Ce: 0.002%, P: 0.001%, S: 0.002%;

[0035] S2. Send the smelted material into a heat treatment furnace, cool down to 1000°C at a rate of 10°C / h, and keep the vacuum of the system at 1×10 during the cooling process. -3 Pa, heat preservation 2h, hot-rolled wire rod, the deformation of each pass is 4%, the hot-rolling temperature is 1250°C, the starting rolling temperature is 1270°C, the final rolling temperature is 1050°C, and the temperature is lowered to 800°C at a rate of ...

Embodiment 3

[0038] A production process of a high-resistance nickel-chromium electrothermal alloy, comprising the steps of:

[0039] S1. Send the master alloy ingot into an intermediate frequency induction furnace for smelting for 25 minutes, and vacuumize to 1.6×10 -3 Pa, through high-purity argon to 1.3×10 4 Pa, the melting temperature is 1480°C;

[0040] Master alloy ingots include by weight percentage:

[0041] Ni: 75.0%, Cr: 22.5%, C: 0.06%, Si: 0.9%, Mn: 0.12%, Al: 0.08%, Fe: 0.35%, Ca: 0.16%, Y: 0.22%, La: 0.04%, Ce: 0.0012%, P: 0.0017%, S: 0.0013%;

[0042] S2. Send the smelted material into the heat treatment furnace, cool down to 920°C at a rate of 18°C / h, and keep the vacuum of the system at 1.6×10 during the cooling process. -3 Pa, heat preservation 1.3h, hot-rolled wire rod, the deformation of each pass is 5.5%, the hot-rolling temperature is 1180°C, the starting rolling temperature is 1290°C, the finishing rolling temperature is 1010°C, and the temperature is lowered at ...

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Abstract

The invention discloses a production process of a high-resistance nickel-chromium electrothermal alloy. The production process comprises the following steps: 1, a master alloy ingot is fed into a medium-frequency induction furnace, smelted for 20-40 minutes, and vacuumized to 1-1.8*10 <-3>Pa, high-purity argon is introduced to 1-2*10<4>Pa, and smelting is performed at the temperature of 1400-1500DEG C; 2, a smelted material is fed into a heat treatment furnace, cooled to 900-1000 DEG C at the speed of 10-20 DEG C / h, the vacuum degree of the system is kept at 1-1.8*10<-3>Pa in the cooling process, the temperature is kept for 1-2h, hot rolling is performed on a wire rod, the deformation of each pass is kept at 4-6%, the hot rolling temperature is at 1150-1250 DEG C, the wire rod is cooled to 600-800 DEG C at the speed of 5-10 DEG C / h, and the temperature is kept for 20-40min; and 3, a product is subjected to acid pickling after being annealed, dried after being washed with water and then sequentially subjected to drawing, annealing and drawing, and the high-resistance nickel-chromium electrothermal alloy is obtained.

Description

technical field [0001] The invention relates to the technical field of electrothermal alloys, in particular to a high-resistance nickel-chromium electrothermal alloy and a production process thereof. Background technique [0002] Electrothermal alloy is an alloy material used to manufacture electric heating elements. When current passes through the alloy element, the Joule effect occurs, converting electrical energy into heat energy. At present, electric heating elements used in industry require their materials not only to have high melting point, small thermal expansion coefficient, good oxidation resistance and high temperature strength, but also to have high resistivity. , The wide use of various industrial electric furnaces has sharply increased the demand for high-resistance electric heating alloys. [0003] Although the widely used nickel-chromium alloy has the advantages of high melting point, small thermal expansion coefficient and good oxidation resistance, it stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C19/05C22F1/10H05B3/12
CPCC22C1/023C22C1/03C22C19/058C22F1/10H05B3/12
Inventor 陈俊达
Owner CHANGSHU MEILI ALLOY MATERIAL CO LTD
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