High-strength steel for water heater inner container and production method thereof

Abstract

The invention relates to a high-strength steel for water heater containers, which solves the current drawbacks of complex welding process, non-once-forming steel plate, many alloy elements, low strength, poor pressure resistance and easy deformation to make enamel drop off. The steel is mainly composed of 0.01% to 0.15% by weight of C, no more than 0.04% by weight of Si, 0.50% to 0.90% by weight of Mn, no more than 0.070% by weight of P, 0.015% by weight of S, 0.005% to 0.060% by weight of Ti, 0.005% to 0.070% by weigh of Als, and the balance Fe and unavoidable impurity. The production method comprises the following steps: desulphurization of hot metal, and converter bottom-top composite blowing; argon blowing; all-protected casting to form a plate blank; and hot rolling by controlling rolling and controlling cooling. According to the invention, the microalloy elements are less, the production cost is low, the welding is convenient, the cold formability is good, the pressure resistance is superior, the yield stress reaches up to 360MPa, the plate is capable of bearing 320MPa or more strength, being once-formed, and directly being enameled to various heater containers.

Description

technical field [0001] The invention relates to the field of manufacturing microalloyed steel, in particular to a high-strength water heater inner tank steel with excellent pressure resistance, welding performance, cold formability, and yield strength greater than or equal to 360 MPa, and a hot-rolled plate of the steel Manufacturing method. The steel plate can be formed at one time and has a good enamelling effect, and can produce various water heater inner tanks with a compressive strength above 320MPa. Background technique [0002] With the improvement of people's daily standards, more and more electrical appliances are invented to improve people's living conditions, and water heaters undoubtedly play an important role in people's modern life. The quality of the inner tank of the water heater directly determines the service life and safety of the water heater. Useful stainless steel material is made at present, as Chinese patent application number is 96110523.2 " manufa...

AI Technical Summary

Problems solved by technology

Useful stainless steel material is made at present, as Chinese patent application number is 96110523.2 " manufacturing method of water heater liner " patent of invention, and it discloses to make water heater liner with stainless steel material, and its deficiency: the one, welding process is complicated; The 2nd, steel plate cannot One-time molding requires the use of reinforcing ribs to improve the pressure resistance; the third is that there are many alloying elements and the manufacturing cost is high

Ordinary cold-rolled plates are also used to manufacture water heater inner tanks. The disadvantages are: ordinary cold-rolled plates have low strength, poor pressure resistance, and are easy to deform and cause enamel to fall off, which cannot meet the needs of high-end water heater products.

In addition, there is an invention patent with the Chinese patent number ZL99119983.9, that is, the approved instruction manual of "Steel-Plastic Composite Water Heater Liner and Its Production Method" records the method of using a steel liner with a plastic lining for the inner shell of the water heater, but does not mention And what kind of steel material to use

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