240MPa-level hot-rolled pickled steel plate for single-sided enameling and production method of 240MPa-level hot-rolled pickled steel plate

Abstract

The invention provides a 240MPa-level high-strength deep-drawn hot-rolled pickled steel plate for single-sided enameling. The 240MPa-level high-strength deep-drawn hot-rolled pickled steel plate comprises the following chemical components in percentage by mass: 0.35-0.65% of Mn, 0.015-0.045% of Als, 0.030-0.060% of Ti, 0.008-0.016% of S, less than or equal to 0.018% of C, less than or equal to 0.05% of Si, less than or equal to 0.020% of P and less than or equal to 0.006% of N. According to the component design and process control for the type of the steel provided by the invention, the steel provided by the embodiment has the yield strength of larger than equal to 240MP and the elongation percentage of over 35% and has no yield. An enameled product prepared from the enamel produced by using a controlled rolling and controlled cooling technology through a wet-process or electrostatic single-sided enameling process is free of fish-scaling, good in sealing performance and capable of realizing 20 thousands of 1-9 bar cold water circulating water pressure fatigue tests.

Description

technical field [0001] The invention belongs to the field of hot-rolled pickled steel plates for enamel, in particular to a hot-rolled pickled steel plate for 240MPa single-sided enamel and a production method thereof Background technique [0002] With the improvement of people's living standards, people have higher and higher requirements for the quality of some household appliances. Take the inner tank of the water heater as an example. The development process of inner tank and special enamelled steel inner tank. The birth of enamel liner in the field of electric water heater is a long process. From the galvanized steel liner to the stainless steel liner, and then to the enamel liner, at present, the enamel liner has become the mainstream product in the domestic and foreign markets. Solar water heaters started later than electric water heaters, and have also gone through the same process. Now they are transitioning from the popularization period of stainless steel inner ...

AI Technical Summary

Problems solved by technology

The disadvantages of this invention are: (1) Higher C content will form more pearlite, which is not good for deep drawing performance. In addition, a large number of air bubbles will be generated during the sintering process, resulting in pinhole defects after sintering ; (2) Due to the high P content, it is easy to segregate on the grain boundary, which is not good for the formability, and the high P content is not good for the welding performance

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