Hot galvanized plate for U-shaped shell of roller washing machine and preparation method thereof

Abstract

The invention provides a hot galvanized plate for a U-shaped shell of a roller washing machine. A steel plate base body comprises the following chemical components of, by mass, less than or equal to 0.0080% of C, less than or equal to 0.40% of Si, less than or equal to 1.2% of Mn, less than or equal to 0.12% of P, less than 0.015% of S, less than or equal to 0.060% of Alt, 0.05-0.08% of Ti, less than 0.0020% of B, less than 0.0060% of N and the balance of iron and inevitable impurities. The hot galvanized plate has the characteristics of being high in yield strength, high in tensile strength,high in press molding, free of aging, impact-resistant and the like, wherein the yield strength is 260-340 MPa, the tensile strength is 420-500 MPa, the elongation after fracture A80 is greater than or equal to 30%, and then the hot galvanized plate can be used for the U-shaped shell of the roller washing machine and steel for a refrigerator panel. The invention further provides a preparation method of the hot galvanized plate. The preparation method comprises the following steps that 1) iron water is obtained, and continuous casting is carried out to obtain a slab; 2) heating, rough rolling,finish rolling and rolling of hot rolled rolls are carried out; 3) pickling-rolling rolling is carried out; and 4) a hot galvanizing process is carried out. According to the component requirements andprocess control, the galvanized plate meeting the use of the U-shaped shell is obtained, and TiC+FeTiP mixture precipitation phases are dispersedly distributed in a microscopic tissue matrix, so thatit shows that solid solution strengthening of the P is vitrificated.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized sheets for washing machines, and relates to a hot-dip galvanized sheet for U-shaped shells of drum washing machines and a preparation method thereof. Background technique [0002] The U-shaped shell of the drum washing machine has very strict requirements on steel, and its high deformation and high speed characteristics require the steel plate to have certain strength, formability and aging resistance. At present, the shell of the washing machine is generally made of hot-dip galvanized sheet after color coating. The color coating process is equivalent to artificial aging. The shell of the washing machine has a large arc at the column. If the aging resistance is poor, tensile strain marks are likely to appear on the column of the washing machine. Therefore, the steel plate is required to have high anti-aging performance. The drum of the washing machine needs to bear force and rotate at ...

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Problems solved by technology

Due to its low cost, LACK is the most widely used. Its biggest disadvantage is that it is prone to aging. Generally, when the aging exceeds 0.5%, edge formation will occur. Moreover, with the extension of time, edge formation will occur if it is not processed for a long time. , that is, tensile strain marks appear during processing, which affects the quality and cannot be used

The production cost of interstitial-free steel is in the middle. The advantage is that it can guarantee no timeliness. The disadvantage is that the strength is insufficient, and it will deform at high speed. The yield strength of interstitial-free steel is generally lower than 180MPa

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