Preparation method of 9SiCr hot-rolled wide strip steel
A wide-band steel and molten steel technology, applied in the field of preparation of 9SiCr hot-rolled wide-band steel, can solve problems such as poor quality and poor surface quality of strip steel, and achieve the effect of excellent surface quality, good surface quality and high dimensional accuracy
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[0032] The invention provides a kind of preparation method of 9SiCr hot-rolled wide strip steel, comprises the following steps:
[0033] S1. Carry out slab continuous casting of molten steel, the degree of superheat is 15-40°C, the casting speed is 0.6-1.5m / min, and the mold heat flux is 1000-1800MW / m 2 , during the slab continuous casting process, the molten steel is put into the secondary cooling zone for electromagnetic stirring, the cooling ratio of the secondary cooling is 0.40~0.60L / t, and then the solidification end is dynamically lightly pressed, and the continuous casting slab is cut into steel ingots after it leaves the fan section ;
[0034] S2. heating the steel ingot obtained in step S1 by a three-stage heating method;
[0035] The process parameters of the heating process are:
[0036] Preheating stage: the temperature is 500~700℃, and the time is 80~100min;
[0037] Heating stage: the temperature of the first heating stage is 1150-1220°C, and the time is 40-6...
Embodiment 1
[0063] The present embodiment provides a kind of preparation method of 9SiCr hot-rolled wide strip, comprises the following steps:
[0064] S1. Converter smelting: put 200 tons of molten iron and 18 tons of steel scrap into a 210-ton converter, use top-bottom double-blowing smelting for 38 minutes to tap the steel, the carbon content at the end point is 0.12%, and the tapping temperature is 1611°C. After tapping the converter, add aluminum, iron and silicon Deoxidize iron, ferromanganese and ferrochrome, add ferrochrome for alloying, add 1000Kg lime and 500Kg slagging agent to make slag.
[0065] S2.LF+RH refining:
[0066] The process of LF is: use aluminum iron for deoxidation, add 1000Kg high-quality composite slag for slag and deoxidation, add appropriate amount of ferrosilicon, ferromanganese, and ferrochrome for alloying according to the difference between the actual composition and the target value when entering the station, and adjust Temperature, after feeding the 15...
Embodiment 2
[0081] The present embodiment provides a kind of preparation method of 9SiCr hot-rolled wide strip, comprises the following steps:
[0082] S1. Converter smelting: put 198 tons of molten iron and 17 tons of steel scrap into a 210-ton converter, adopt top-bottom double-blowing smelting for 35 minutes to tap the steel, the carbon content at the end point is 0.15%, and the tapping temperature is 1603°C. After tapping the converter, add aluminum, iron and silicon Deoxidation and alloying of iron, ferromanganese and ferrochromium, adding 1000Kg of lime and 500Kg of slagging agent to make slag.
[0083] S2.LF+RH refining:
[0084] The process of LF is: use aluminum iron for deoxidation, add 1000Kg high-quality composite slag for slag and deoxidation, add appropriate amount of ferrosilicon, ferromanganese, and ferrochrome for alloying according to the difference between the actual composition and the target value when entering the station, and adjust Temperature, after feeding the 1...
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Abstract
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