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Enamel steel with high-temperature baking hardenability and manufacturing method thereof

A technology of bake hardening and manufacturing method, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc. to achieve the effect of improving service life and suppressing pinhole defects

Active Publication Date: 2014-12-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield strength of the enamelled steel disclosed in this Chinese patent document after simulated enamel firing is lower than that before simulated enamel firing

Method used

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  • Enamel steel with high-temperature baking hardenability and manufacturing method thereof
  • Enamel steel with high-temperature baking hardenability and manufacturing method thereof
  • Enamel steel with high-temperature baking hardenability and manufacturing method thereof

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Experimental program
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Embodiment A1-A6 and comparative example B1

[0059] According to the following steps (1)-(5) manufacture the enamelling steel among the embodiment A1-A5 and comparative example B1, according to the following steps (1)-(9) manufacture the enameling steel among the embodiment A6:

[0060] 1) molten iron pretreatment;

[0061] 2) Converter smelting: decarburization, dephosphorization, removal of residual elements and harmful gases, etc. are realized through the top-bottom combined blowing converter;

[0062] 3) Refining: further remove harmful gases and residual elements, add titanium and other alloying elements, add aluminum and other deoxidation, and achieve precise control of chemical composition. The mass percentage distribution ratio of each chemical element of Control Examples A1-A6 and Comparative Example B1 is shown in Table 1;

[0063] 4) Continuous casting: molten steel is cast into continuous casting slabs with a thickness of 200 and 230 mm. After the continuous casting slabs are cooled, the surface quality is m...

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Abstract

The invention discloses enamel steel with high-temperature baking hardenability. The enamel steel comprises chemical elements in percentage by weight as follows: 0.008-0.020% of C, 0.05-0.50% of Mn, 0.021-0.035% of S, 0.005-0.050% of Alt or 0.003-0.045% of AlS, larger than 0 and less than 0.003% of N, larger than 0 and less than or equal to 0.010% of O and element Ti, wherein the weight percentage of element Ti meets the conditions N*Ti smaller than or equal to 3*10<-4>,S*Ti greater than or equal to 2*10<-3> and Ti greater than or equal to 3.43N+1.5S+0.02, and the balance is Fe and unavoidable impurity elements. The invention further discloses a manufacturing method of the enamel steel, which comprises the steps of pretreatment of hot metal, converter smelting, refining, continuous casting and hot rolling. The enamel steel with high-temperature baking hardenability has relatively good forming property, good welding property, excellent firing property and excellent enameling property.

Description

technical field [0001] The invention relates to an alloy steel material and a manufacturing method thereof, in particular to a steel for enamelling and a manufacturing method thereof. Background technique [0002] For volumetric water heaters, the liner is its key component, which determines the safety and service life of the water heater. The enamel liner with the steel plate as the base blank has many characteristics such as good corrosion resistance, high surface hardness, smoothness and easy cleaning, etc. Such an enamel liner greatly improves the service life and comprehensive performance of the water heater liner. When steel plates are used as the bottom billet to make the enamel liner of the water heater, the steel plates need to be blanked, shaped, welded, enamelled, and finally fired at a high temperature of about 830°C. However, in order to meet the requirements of producing high-quality enamel liners, steel plates must meet various performance requirements such a...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
CPCC22C38/14C21D8/021C21D8/0226C21D1/02C21D8/0242C21D8/0236C21D8/0273C21D8/041C21D8/0426C21D8/0436C21D8/0442C21D8/0473C21D8/0463C21D8/0263C21D9/46C21D9/48C21D2211/004C22C1/02C22C38/04C22C38/08C22C38/16C22C38/12C22C38/18C22C38/002
Inventor 孙全社
Owner BAOSHAN IRON & STEEL CO LTD