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Enamel steel, as well as preparation method and application thereof

A technology of enamel steel and mass percentage, which is applied in the field of hot-rolled enamel steel, can solve the problems of affecting the service life of the inner tank of the water heater, poor adhesion between the steel plate and the glaze, and low strength level of the enamel steel, so as to achieve good anti-scaling performance and high Strength Roughness, high adhesion strength grade effect

Active Publication Date: 2020-11-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength level of the enamelled steel produced by the existing production technology is low, and the surface is treated by conventional pickling process. After pickling, the roughness is low, and the adhesion between the steel plate and the glaze is poor, which directly affects the service life of the inner tank of the water heater.

Method used

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  • Enamel steel, as well as preparation method and application thereof
  • Enamel steel, as well as preparation method and application thereof
  • Enamel steel, as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0038] In another aspect, the present invention provides a method for preparing the enamelled steel, comprising: (1) continuously casting molten iron with qualified components into a slab; (2) heating the slab, and cooling it after hot rolling (3) Enamel steel is obtained after coiling, smoothing, shot blasting and pickling.

[0039] Wherein, the molten iron, by mass percentage, includes: C: 0.01%-0.14%, Si≤0.10%, Mn: 0.20%-1.6%, P≤0.040%, S≤0.040%, Ti: 0.01%-0.12 %, Al: 0.01%-0.07%, N≤0.010%, Mn / S≥30, the rest is Fe and unavoidable impurities; preferably, by mass percentage, including: C: 0.01%-0.12%, Si: 0.01%-0.10%, Mn: 0.30%-1.6%, P≤0.035%, S≤0.035%, Ti: 0.01%-0.10%, Al: 0.01%-0.06%, N≤0.008%, Mn / S≥30 , the rest are Fe and unavoidable impurities; more preferably, by mass percentage, including: C: 0.02%-0.10%, Si: 0.01%-0.08%, Mn: 0.35%-1.5%, P≤0.030%, S≤0.030%, Ti: 0.02%-0.10%, Al: 0.02%-0.06%, N≤0.007%, Mn / S≥30, and the rest are Fe and unavoidable impurities.

[0040] ...

Embodiment 1

[0055] The thick 2mm of the enamelled steel plate of the present embodiment, wide 1180mm, the mass percentage distribution of its chemical composition is as follows:

[0056] C: 0.07%, Si: 0.06%, Mn: 1.15%, P: 0.010%, S: 0.012%, Ti: 0.06%, Al: 0.05%, N: 0.006%, Mn / S: 96%, the rest is Fe with unavoidable impurities.

[0057] The preparation method of present embodiment enamelled steel is as follows:

[0058] 1. Continuous casting into slab after converter smelting and out-of-furnace refining (LF+RH), the size of the slab is 230mm×1200mm.

[0059] 2. Heat the slab to 1280°C, and roll it through multiple passes in the rough rolling mill, with a cumulative deformation rate of over 70%; for finishing rolling, use a multi-stand hot rolling unit to roll the slab to the target thickness of 2mm, with a cumulative deformation rate of over 70%. More than 70%, the final rolling temperature is 890°C, the laminar flow cooling method is used to cool and then coiled, and the coiling tempera...

Embodiment 2-7 and comparative example 1-3

[0064] Next, using the same rolling process and shot blasting process as in Example 1, the continuous casting slabs of the same size and specification were prepared into enamelled steel of the same size and specification. Among them, the composition of the enamelled steel in each embodiment and comparative example is shown in Table 1, the main preparation process parameters of the enamelled steel in each embodiment and comparative example are shown in Table 2, and the performance test results of the prepared enamelled steel are shown in Table 3.

[0065] Table 1 Example 2-7 and the enamelled steel composition summary of comparative examples 1-3

[0066] C Si mn P S Ti Al N Mn / S Example 2 0.12 0.01 0.95 0.009 0.021 0.01 0.026 0.002 45 Example 3 0.08 0.05 0.47 0.034 0.008 0.03 0.070 0.005 59 Example 4 0.10 0.08 0.76 0.040 0.009 0.10 0.043 0.007 84 Example 5 0.05 0.07 1.48 0.015 0.040 0.07 0.015 0.008 3...

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Abstract

The invention belongs to the technical field of hot-rolled enamel steel, and particularly relates to enamel steel, as well as a preparation method and application thereof. The enamel steel is preparedfrom the components in percentage by mass: 0.01 percent to 0.14 percent of C, less than or equal to 0.10 percent of Si, 0.20 percent to 1.6 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.040 percent of S, 0.01 percent to 0.12 percent of Ti, 0.01 percent to 0.07 percent of Al, less than or equal to 0.010 percent of N, and the balance Fe and inevitable impurities,wherein Mn / S is larger than or equal to 30. The enamel steel provided by the invention has no scale explosion defect after being enameled, and has a good anti-scale explosion performance; the enamel steel has a high density strength grade (A1 grade); and the enamel steel can withstand 200,000 times of circulating pressure tests and pressure withstand tests with the pressure being 1.6 MPa, and after the test, no abnormal deformation, leakage or porcelain layer falling off occurs in a tank body, so that the operating requirements of a tank of a water heater are met.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled enamelled steel, specifically relates to an enameled steel and its preparation method and application, in particular to high-strength and high-roughness hot-rolled enameled steel for water heater inner tanks and its manufacturing method. Background technique [0002] With the technological progress and innovative development of the water heater industry, its inner tank has gone through three generations from the initial galvanized steel inner tank, to stainless steel inner tank, and then to enamel inner tank. In recent years, in the production of water heaters, more and more enamel inner tanks are used. Because of its superior performance in anti-corrosion, it is replacing other inner tanks and becoming the main force of water heater inner tanks. The enamel liner is enamel-plated on the surface of the steel plate, which can withstand a wide range of temperature changes. Its main properties incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/06C22C38/04C22C38/02B21B1/22
CPCC22C38/14C22C38/06C22C38/04C22C38/02B21B1/22B21B2001/225
Inventor 何晋辛建卿王艳赵建伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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