Bottom covering sheet and preparation method thereof

Abstract

The invention relates to a bottom covering sheet, which comprises a round bottom plate, wherein a through hole is arranged in the middle of the round bottom plate, a plurality of buffer holes are uniformly distributed between the through hole and the edge of the round bottom plate, the edge of the buffer hole projects toward one surface perpendicular to the bottom covering sheet to form a hole shoulder, and the bottom covering sheet comprises the following components by weight: 0.07-0.10 part of C, 9-12 parts of Mn, 4.0-5.2 parts of Si, 0.015-0.03 part of P, 0.015-0.025 part of S, 14-17 partsof Cr, 0.40-0.50 part of Ti, 0.5-1.0 part of Mo, 0.3-0.5 part of N, 0.2-0.4 part of Zr, and the balance of iron. According to the present invention, the bottom covering sheet has advantages of good corrosion resistance, good high-temperature resistance and good oxidation resistance, can be closely bonded to the bottom of the pan, cannot loosen and shed, has the ensured flatness, and cannot bend and deform.

Description

technical field [0001] The invention relates to the technical field of alloy materials, more specifically, it relates to a back-covering sheet and a preparation method thereof. Background technique [0002] Aluminum pot is a kind of pot that is widely used in family kitchens. It has the following characteristics: 1. Good plasticity, smooth surface, convenient production and processing; 2. Good heat transfer effect and high thermal efficiency; 3. Light specific gravity, the specific gravity of aluminum It is only 2.7. Therefore, under the premise of the same weight, the thickness of the aluminum pot is much thicker than that of the iron pot and the stainless steel pot, generally about 2 to 6 mm; The parts in contact will not generate local high temperature, less oil fume, environmental protection and energy saving; because of the above characteristics, it is very popular among consumers. [0003] With the development of society and the advancement of science and technology, ...

AI Technical Summary

Problems solved by technology

However, the existing aluminum pan cannot be used on the induction cooker because it does not have the function of magnetic conduction. It must be compounded with a magnetic conductor at the bottom to achieve the heating effect, that is, the bottom plate came into being.

The cladding film is the magnetizer compounded at the bottom of the pot body. The commonly used cladding film is made of stainless steel plate. This kind of steel plate is cold-pressed or hot-forged on the bottom surface of the aluminum pot. Since the expansion coefficient of aluminum and steel is almost twice the difference, When the bottom of the pan is heated above 300°C, the length or area of ​​the aluminum alloy pan body and the stainless steel plate vary greatly in the part far from the center, which is very easy to cause damage to the joint between the aluminum alloy pan body and the steel plate. Due to repeated thermal expansion and contraction during repeated use, the stainless steel plate will loosen or even fall off from the pot body, which seriously affects the use of aluminum pots

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