JPH0357185A - Electromagnetic induction heating pan - Google Patents

Abstract

PURPOSE:To improve corrosion resistance, and to obtain a clad material highly connected with stainless by clad-connection-process stainless to a double layered clad of aluminium alloy including Mn, Mg, and of an aluminium alloy of high purity Al. CONSTITUTION:To an aluminium alloy Al in which Mn and Mg components are added by 0.2 to 2.0%, an aluminium alloy B2 in which Al is added by 99% or more, is clad-processed. A ferritic stainless 3 heated by electromagnetic induction and the aluminium alloy double layered clad material are roll-clad- processed with each other at a high temperature and under high pressure, so as to form a flat surfaced clad material. After the flat surfaced clad material is made into a form of a pan by drawing, a first fluorine coat 4 is coated and is dried, and a second layer top fluorine coat 5 is then coated, and is burned and baked. Even when a pinhole exists in the fluorine coat, due to the inclusion of Mn and Mg, pitting corrosion of the aluminium alloy Al hardly occurs, and corrosion resistance can thus be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetic induction heating pot for cooking using electromagnetic induction heating, which is used in general households.

Conventional technology Pots that use electromagnetic induction heating for cooking have traditionally been made of stainless steel, iron, and nutless.
Because the inside of the pot was made of stainless steel, food could stick or burn, making cooking and cleaning difficult.

In order to solve the above problem, there was a pot which was clad with A1100 series aluminum on the inside and ferritic nutenless on the outside, and a fluorine coat with non-adhesive properties was applied to the inside of the pot.

Problems to be Solved by the Invention In the above-mentioned conventional electromagnetic induction heating pot, a fluorine coat is processed on the surface of the inner A1 100 series aluminum alloy, but the volatility of various welding materials and the fluorine The presence of pinholes is inevitable due to the melting properties of
During use of the pot, corrosion progresses faster through these pinholes than with conventional pots made from single aluminum alloy with a fluorine coating.
Moreover, it becomes pitting corrosion and corrosion progresses.

The Mn and Mg fractions were each reduced from 0.2% to 2.
Aluminum alloy A containing 0%, such as A3004,
Even when cladding is bonded to stainless steel, sufficient cladding strength cannot be obtained, and cracks occur when drawn into a pot shape.

When clad rolling three layers of casing, aluminum alloy A, aluminum alloy B, and stainless steel at the same time, there will be a difference in elongation between aluminum alloy and stainless steel when heating aluminum alloy, and insufficient strength and hardness due to heating. The processability of the clad roll is poor due to the following reasons, the yield is poor due to poor surface condition, etc., and the clad bonding force is buffed and cracks occur when drawing into a pot shape.

The present invention solves the above-mentioned problems by improving corrosion resistance by suppressing the progress of corrosion from pinholes, and by combining this highly corrosion-resistant aluminum alloy with a material that generates electromagnetic induction heating with high bonding strength, while also improving yield. As a cladding with low bonding variation in height, it can be drawn in pot shape 1.

Means for Solving the Problems In order to achieve the above objects, the present invention provides anoremi alloy A containing 0.2% to 2.0% of M1 and Mg on the inner side, and an AI content of 99% or more in the middle. aluminum alloy B
This is a two-layered hood made of aluminum alloy A and aluminum alloy B with stainless steel as the outer layer and stainless steel clad bonded to the outer layer.

Function: In the above structure, the fluorine coat inevitably has holes due to the volatility of various welding materials and the meltability of fluorine during firing or baking. 1. Also, the existence of a potential difference between aluminum alloy and stainless steel, which is a cladogram where materials with different potentials appear on the surface, cannot be avoided.

Furthermore, the pot is exposed to an alternating magnetic field due to electromagnetic induction, and the existence of forced potentials such as the injection of eddy current electrons cannot be avoided. In such an environment that is unfavorable to corrosion, electric potential concentrates in the pinholes! It is conceivable that pitting corrosion may occur. Generally speaking, A1100 yarn is said to have excellent corrosion resistance. However, when looking only at pitting corrosion resistance, M
An aluminum alloy containing n, Mg is better. It is because a solid solution of MX1 exists and A. This is because it is thought that forming base metals on the surface prevents pitting corrosion.

and Mnp and Mga respectively. ．． 2% to 2.0
Aluminum alloy A1 containing %, for example, A3004Ia7
In order to solve this problem, aluminum alloy A,! :A
Aluminum alloy B with a 4 content of 99% or more, for example A110
0 and 2 layers under the crack. Since it is made of the same material as aluminum, it is easy to obtain stable cladding strength and a high stepping strength. It is thought that the high yield is also related to the fact that there are many similar elements, which makes it easier to combine, and that the elongation, strength, and hardness are similar. Aluminum alloy B with an Al content of 99% or more in a two-layer cladding of anoremi alloy A and aluminum alloy B {1
111 is made of stainless steel and subjected to clad roll processing. Stainless steel and aluminum alloy B are clad bonded with stainless steel with high bonding strength because aluminum alloy B has a high AJ7 purity of 99% and has very little amount of Mn, Mg, etc. precipitated on the surface. 1. At this time, aluminum alloy A and aluminum alloy B
The cladding is a two-layer cladding made of aluminum and stainless steel, and even if the elongation, strength, and hardness when pressurized at high temperatures are different, the cladding can be processed while each material is in contact with the cladding roll. The bonding is stable and has little variation, and it can be processed with high bonding strength, resulting in a cladding material with a high yield, which can be stably processed without breaking even when drawn into a pot shape.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

Aluminum alloy A1 containing 0.2% to 2.0% of Mn and Mg, respectively, and aluminum alloy B2 containing v-f of 99% or more of AI are cladded. Next, the ferritic stainless steel 3 heated by electromagnetic induction and the aluminum alloy two-layer cladding material are subjected to low ρ cladding processing under high temperature and pressure to form a plate-shaped clad material.

Among them, instead of stainless steel 3, a material made by sandwiching iron heated by electromagnetic induction with stainless steel may be used.

After shaping the flat cladding material into a pot shape by drawing b processing, the outer stainless steel 3 is subjected to a puffing process to remove scratches from the cladding roll, browning, and squeezing to give it a glossy finish, and after thorough cleaning. After the surface of the aluminum alloy A1 is roughened and activated by plano polishing, a first layer of fluorine 4 is coated and dried, and a second layer is again coated with a top fluorine 5 and baked.

Effects of the Invention As described above, according to the present invention, the presence of pinholes in the fluorine coating, the cladding material in which materials with different potentials of aluminum alloy and stainless steel are exposed on the surface, and the presence of forced potential due to electromagnetic induction. Even with the combined effect of Mn and Mg, pitting corrosion of aluminum alloy A is difficult to occur due to the inclusion of Mn and Mg, thereby improving corrosion resistance.

In addition, aluminum alloy A and aluminum alloy B containing 99% Al
A two-layer clad roll is processed to form a clad material with a strong bond between similar materials, and then the aluminum alloy B side of this two-layer clad material and Sden Rene are clad roll processed to improve elongation and strength when pressurized at high temperatures. Even if the materials are different, each material can be processed in contact with the clad roll, so the clad bond is stable and has little variation, and can be processed with high bonding strength, resulting in a high yield and the ability to draw into a pot shape. This has the effect of allowing stable machining without cracking.

[Brief explanation of drawings]

The figure is a sectional view of a main part of an electromagnetic induction heating pot showing an embodiment of the present invention. 1... Aluminum alloy A, 2... Anoremi alloy Bs 3... Stainless steel, 4...
...Fluorine, 6... Tosop fluorine.

Claims (1)

[Claims] Mn and Mg inside from 0.2% to 2.0% each
Aluminum alloy A containing, aluminum alloy B with an Al content of 99% or more in the middle, and ferritic stainless steel or stainless steel, iron, and stainless steel on the outside, and two of the aluminum alloy A and the aluminum alloy B. An electromagnetic induction heating pot in which the outer material is clad bonded to a layer clad.