Hot rolling high strength steel plate for two-sided porcelain enamel and manufacturing method thereof

A high-strength steel plate and manufacturing method technology, applied in the direction of length control, etc., can solve the problems of high cost, coarse particles, unfavorable steel plate formability and surface quality, etc., and achieve good plasticity, high strength, and good anti-scaling effect.

Inactive Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since titanium is a precious metal, the more titanium is added, the higher the cost, and the higher the titanium addition, the higher the precipitation temperature of titanium nitride, and the larger the precipitated particles. It is not conducive to improving the formability and surface quality of the steel plate

Method used

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  • Hot rolling high strength steel plate for two-sided porcelain enamel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Smelt molten steel according to the following chemical composition: C: 0.12wt%, Si: 0.80wt%, Mn: 1.2wt%, P: 0.015wt%, S: 0.035wt%, Al: 0.039wt%, N: 0.0150wt%, Ti : 0.050wt%, V: 0.020wt%, the balance is Fe and unavoidable impurities.

[0035] The molten steel blown in the converter according to the above ratio is vacuum degassed and then continuously cast. The obtained continuous casting slab is heated at 1150°C and then rolled for multiple passes within the austenite recrystallization temperature range. The total reduction rate is ≥50%, and then rolled in one or more passes within the temperature range of austenite recrystallization zone or non-recrystallization zone, the total reduction ratio is ≥50%, and the final rolling temperature is 820°C. Then it is cooled to the coiling temperature by two stages of water cooling, the front and rear of the water cooling are air-cooled, the water cooling rate of the front stage is 45°C / s, the water cooling rate of the rear stage i...

Embodiment 2

[0037] Smelt molten steel according to the following chemical composition: C: 0.05wt%, Si: 0.10wt%, Mn: 1.8wt%, P: 0.011wt%, S: 0.008wt%, Al: 0.018wt%, N: 0.0080wt%, Ti: 0.015wt%, V: 0.045wt%, and the balance is Fe and unavoidable impurities.

[0038]The molten steel blown by the converter according to the above ratio is subjected to vacuum degassing treatment and then die-casted. The steel ingot after die-casting is rolled into a billet. Pass rolling, the total reduction rate is ≥ 50%, and then rolled in one or more passes within the temperature range of the austenite recrystallization zone or non-recrystallization zone, the total reduction rate is ≥ 50%, and the final rolling temperature is 1050 ℃. Then through multi-stage water cooling to the coiling temperature, air cooling before and after the water cooling, the water cooling rate is 35°C / s, and the coiling temperature is 700°C.

Embodiment 3

[0040] Molten steel is smelted according to the following chemical composition: C: 0.09wt%, Si: 0.29wt%, Mn: 1.3wt%, P: 0.011wt%, S: 0.017wt%, Al: 0.019wt%, N: 0.0085wt%, Ti: 0.020 wt%, V: 0.090 wt%, the balance being Fe and unavoidable impurities.

[0041] The molten steel blown by the converter according to the above ratio is vacuum degassed and then die-cast. The steel ingot after die-casting is initially rolled into a billet. Pass rolling, the total reduction rate is ≥ 50%, and then rolled in one or more passes within the temperature range of the austenite recrystallization zone or non-recrystallization zone, the total reduction rate is ≥ 50%, and the final rolling temperature is 1000 ℃. Then it is water-cooled to the coiling temperature in two stages, the front and rear are air-cooled, the water-cooling rate in the front stage is 41°C / s, the water-cooling rate in the rear stage is 20°C / s, and the coiling temperature is 640°C.

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Abstract

The invention provides a hot-rolled high strength steel sheet used in double-face enamel and a preparation method thereof, comprising the following chemical composition: C: 0.05 to 0.15 weight percent, Si: less than or equal to 1.0 weight percent, Mn: 0.5 to 2.0 weight percent, P: less than or equal to 0.05 weight percent, S: less than or equal to 0.05 weight percent, Al: 0.01 to 0.10 weight percent, N: 0.008 to 0.015 weight percent, Ti: less than or equal to 0.05 weight percent, V: 0.02 to 0.2 weight percent, and the rest are Fe and inevitable impurities. By controlling the hot rolling technology and the cooling speed, second phase particles which are tiny and dispersed are ensured to be generated from vanadium and titanium in the steel, thus enhancing the strength, fish scaling resistance and adherence of the steel sheet; and the products after enamel firing can still maintain higher strength, thus better meeting the compression resistance requirements of different porcelain products, and being capable of being used for producing chemical reaction tanks and water treatment tanks and the like from double-face enamel.

Description

technical field [0001] The invention relates to a hot-rolled high-strength steel plate, in particular to a hot-rolled high-strength steel plate for double-sided enamelling and a manufacturing method thereof. Background technique [0002] Enamel steel plates play a very important role in national life and are widely used in light industry, household appliances, metallurgy, chemical industry, construction and other industries to make kitchen utensils, sanitary ware, barbecue ovens, water heater inner tanks, building decorative panels, chemical reaction tanks Wait. There are many types of enamelled steel plates. According to the production process, there are hot-rolled plates, cold-rolled plates, and cladding plates; Enamel, etc.; in terms of strength, it can be divided into different strength levels such as 255MPa and 330MPa. [0003] The hot-rolled high-strength steel plate for double-sided enamel has the characteristics of realizing double-sided enamel with dense glaze, go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/14B21B37/70C21D8/02C22C33/04C21C7/10
Inventor 孙全社
Owner BAOSHAN IRON & STEEL CO LTD
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