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Preparation method of anti-carburizing electrothermal alloy

An electrothermal alloy and anti-carburization technology, applied in the direction of heating element materials, etc., can solve the problems of electrothermal alloys with weak anti-carburization ability, unsuitable for use in carburizing furnaces, poor weldability, etc., and achieve good melting effect and anti-carburization Strong ability and good solderability

Active Publication Date: 2015-05-20
江苏禾一电热材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with Cr20Ni80, the novel high-resistance electrothermal alloy material prepared by the present invention has better oxidation resistance, and is an electrothermal alloy material with small thermal expansion coefficient, good high-temperature strength, long service life and high resistivity, but this method The prepared electrothermal alloy has weak carburization resistance, is not suitable for use in carburizing furnaces, and has poor weldability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Alloy smelting: Industrial pure iron, metal chromium and metal aluminum are selected as furnace materials, put into an intermediate frequency vacuum induction furnace for melting, and metal yttrium with a purity of 99% is added to the furnace under the protection of argon three minutes before tapping. In the crucible, the tapping temperature is controlled at 1550°C, and the chemical composition of the alloy is C: 0.005, Mn: 0.25, S: 0.002, P: 0.024, Si: 0.57, Cr: 22.30, Al: 5.83, Y: 0.50, The rest is Fe;

[0016] (2) Making wire rod: put the steel ingot smelted in step (1) in a resistance furnace at 800°C and slowly cool to room temperature with the furnace, and forge it into a billet after peeling, and then put the forged billet into Tie into a wire rod with a diameter of 7mm on a small hot rolling mill;

[0017] (3) Heat treatment: Heat the wire rod prepared in step (2) to 850-900°C in a box-type resistance furnace, keep it warm for 40-60 minutes, and then put it...

Embodiment 2

[0020] Example 2: The rest are the same as in Example 1, except that in the step (1), the tapping temperature is controlled to be 1610°C; in the step (3), the heating temperature of the box-type resistance furnace is controlled to be 760°C, and the holding time is controlled In the step (4), control the alkali boiling temperature to 450°C, control the alkali boiling time to 40 minutes, control the pickling temperature to 55°C, and control the pickling time to 30 minutes.

Embodiment 3

[0021] Example 3: The rest are the same as in Example 1, except that in the step (1), the tapping temperature is controlled to be 1640°C; in the step (3), the heating temperature of the box-type resistance furnace is controlled to be 774°C, and the holding time is controlled In the step (4), control the alkali boiling temperature to 450°C, control the alkali boiling time to 44 minutes, control the pickling temperature to 61°C, and control the pickling time to 40 minutes.

[0022] After the above process steps, the electrothermal alloy wire sample is taken out to be tested:

[0023] serial number Antioxidant 1000℃ carburizing 500h average resistance change rate / % Weldability Anti-carburization life at furnace temperature 1000°C / h Pass rate / % Example 1 excellent -2.10 excellent 32 98 Example 2 excellent -2.21 excellent 31 99 Example 3 excellent -1.86 excellent 32 96

[0024] It can be seen from the above data tha...

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Abstract

The invention discloses a preparation method of an anti-carburizing electrothermal alloy, and relates to the iron chromium aluminum alloy processing and manufacturing field; the preparation method includes five technological processes of alloy smelting, steel wire rod preparation, heat treatment, alkali boiling and pickling, and drawing; in the preparation method, a medium-frequency vacuum induction furnace is selected as a melting device, moreover, through strict control of a tapping temperature, a furnace material undergoes a full reaction in the furnace, a smelting effect is good, and a prepared electrothermal alloy steel ingot has good quality; in a forging process, through control of a die forging temperature, the surface quality and the core part quality of a fogged steel wire rod are both relatively good, the steel wire rod after rolling is subjected to alkali boiling and pickling processes, an oxidation film on the surface of an electrothermal alloy wire is basically cleaned, impurity residues are few, and the anti-carburizing electrothermal alloy wire produced by the preparation method has strong anti-carburizing ability, can be widely used in heating elements in a carburizing furnace, and is long in service life, good in weldability, intact in welding surface and worthy of promotion.

Description

technical field [0001] The invention relates to the field of processing and manufacturing of iron-chromium-aluminum alloys, in particular to a preparation method of an anti-carburization electrothermal alloy. Background technique [0002] Anti-carburizing electric heating elements can be used as heating elements of various protective atmosphere heating furnaces. At present, most of these electric heating elements are used in controllable atmosphere heat treatment heating furnaces at home and abroad. This kind of furnace can be used for carburizing and carbonitriding of other parts. In terms of co-infiltration, bright quenching and bright annealing, etc., since the 1960s in the United States, Japan, Britain and other countries, the controllable atmosphere heat treatment has developed very rapidly. Almost all automobile and tractor parts have adopted this process. The application number is CN 201110101552.8 discloses a novel high-resistance electrothermal alloy material and a ...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C33/04H05B3/12
Inventor 王良玉张坚刘浩方
Owner 江苏禾一电热材料有限公司
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