A kind of manufacturing method of Invar alloy foil

A technology of Invar alloy and manufacturing method, which is applied in the field of Invar alloy foil manufacturing, can solve the problems of reducing production efficiency and yield rate, environmental pollution, product performance fluctuations, etc., to improve production efficiency and yield rate, and simplify preparation process, the effect of avoiding cracking problems

Active Publication Date: 2020-02-18
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The typical production process of Invar alloy mainly includes: vacuum induction melting, ingot casting, peeling, heating, forging, grinding, heating, hot rolling, solution treatment, pickling, grinding, coiling, cold rolling, continuous bright heat treatment , cold rolling, continuous bright heat treatment, cold finish rolling and packaging; production practice shows that peeling and grinding treatment seriously reduces production efficiency and yield, making the comprehensive yield from steel ingot to cold rolled strip only about 50%, Cause a lot of waste of resources and energy, and it is not conducive to the preparation of foil materials
In this regard, people have developed an electrodeposition method to prepare Invar alloy foil; however, the grain size of the Invar alloy foil obtained by the electrodeposition method is at the nanometer level, resulting in high hardness, poor toughness, and poor toughness of the electrodeposited Invar alloy foil. The thermal stability is poor, and the γ fiber texture ( / / ND preferred orientation) that is unfavorable to the magnetic properties will be formed in the product; on the other hand, this method needs to use electrolyte to prepare foil, which is easy to cause environmental pollution. When the performance is unstable, it will also cause product performance fluctuations; it can be seen that the two existing production processes of Invar alloy foil are not in line with the green development direction of the metal material industry. How to optimize the production process, improve the yield, reduce costs, and improve Product performance has become the goal pursued by metallurgists

Method used

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  • A kind of manufacturing method of Invar alloy foil
  • A kind of manufacturing method of Invar alloy foil
  • A kind of manufacturing method of Invar alloy foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Process such as figure 1 shown;

[0039] The molten steel is smelted in an intermediate frequency vacuum induction furnace, and the smelted molten steel is poured through the tundish into a cavity composed of two crystallization rollers and two side sealing plates by using a twin-roller thin strip continuous casting device to form a molten pool. The molten steel solidifies with the rotation of the crystallization roller and is exported at a speed of 20m / min to make an Invar alloy cast belt, the composition of which is Ni 35%, C0.005%, Si 0.1%, Mn 0.2%, S 0.01% by mass percentage , P 0.01%, the balance is Fe and unavoidable impurities; Invar cast strip thickness 3mm;

[0040] The cast strip of Invar alloy is water-cooled to room temperature by the cooling unit at a cooling rate of 10-100°C / s to obtain a cast strip at room temperature;

[0041] The room temperature cast strip is pickled to remove the surface oxide scale, and then a cold rolling is performed, and the red...

Embodiment 2

[0045] Method is with embodiment 1, and difference is:

[0046](1) The composition of Invar cast strip is Ni 37.5%, C 0.5%, Si 0.6%, Mn 0.8%, Ti 2.5%, Al 1.0%, S 0.01%, P 0.01%, Zr 0.1%, Rare earth element 0.2%; Invar alloy casting strip thickness 2.5mm; export speed 60m / min during continuous casting;

[0047] (2) The reduction rate of primary cold rolling is 75%; the intermediate annealing temperature is 800°C, and the time is 20 minutes; the reduction rate of secondary cold rolling is 96.8%.

[0048] (3) The final annealing temperature is 900°C, the time is 20min, the thickness of the Invar alloy foil is 0.02mm, and its texture is a strong cubic texture ({001} preferred orientation), such as Figure 4 shown;

[0049] Adjust the process steps and carry out the comparison test according to the above method. After pickling, it is directly cold-rolled to 0.02mm, that is, the cold-rolling reduction rate is 99.2%. The intermediate annealing is canceled, and the texture of the fi...

Embodiment 3

[0051] Method is with embodiment 1, and difference is:

[0052] (1) The composition of Invar cast strip is Ni 36%, C 0.3%, Si 0.3%, Mn 0.4%, Ti1.5%, Al 0.5%, S 0.02%, P 0.01%, Zr 0.06% in mass percentage ; Invar casting strip thickness 5mm; export speed 30m / min during continuous casting;

[0053] (2) The reduction rate of primary cold rolling is 80%; the intermediate annealing temperature is 700°C, and the time is 30 minutes; the reduction rate of secondary cold rolling is 90%.

[0054] (3) The final annealing temperature is 800°C, the time is 10min, the thickness of the Invar alloy foil is 0.1mm, and its texture is a strong cubic texture ({001} preferred orientation);

[0055] Adjust the composition of the molten steel and conduct a comparative test according to the above steps. The composition of the ingot contains Ni 32.0%, C0.1%, Si 0.3%, and Mn 0.9% by mass percentage; the texture of the final annealed plate obtained is diffuse.

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Abstract

The invention relates to a method for manufacturing an invar alloy foil material, and belongs to the technical field of materials. The method comprises the following steps that (1), molten steel is smelted, a double-roller thin-strip continuous casting device is used, and an invar alloy cast strip is prepared; (2), water cooling is carried out at a cooling rate of 10-100DEG C / s; (3), primary coldrolling is carried out after acid pickling, intermediate annealing is carried out on a primary cold-rolled sheet, and secondary cold rolling is carried out after acid pickling is carried out again; and (4), final annealing is carried out on a secondary cold-rolled sheet, the annealing temperature is 600-900 DEG C, and the annealing time is 5-60 min. According to the method, the segregation of harmful elements can be effectively inhibited, the oxidation of the invar alloy cast strip is reduced, the yield is remarkably improved, the cracking problem caused by poor thermoplasticity can be avoided, and the invar alloy foil material has the advantages of being low in hardness, good in toughness, good in thermal stability and strong in cubic texture.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for manufacturing an Invar alloy foil. Background technique [0002] Invar alloy is a Fe-Ni alloy containing about 36% (mass fraction) of Ni, which has an extremely low average linear expansion coefficient, and still has good strength, plasticity and toughness matching at low temperatures; therefore, it is mainly used for manufacturing Precision instruments, laser resonators and special transmission cables are the core materials of liquefied natural gas (LNG) carriers. Invar alloy foil has the characteristics of high magnetic saturation strength, low coercive force, and good corrosion resistance. It can be used as a magnetic shielding material and has been widely used in the electronics and information industries. [0003] The typical production process of Invar alloy mainly includes: vacuum induction melting, ingot casting, peeling, heating, forging, grin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/04C22C38/14C22C38/06B22D11/06C21D1/26C21D8/02B21B1/46
CPCB21B1/463B22D11/0622C21D1/26C21D8/0236C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14
Inventor 宋红宇刘海涛王国栋
Owner NORTHEASTERN UNIV LIAONING
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