Production process of high quality filter steel base plate

Abstract

The invention discloses a production process of a high quality filter steel base plate. The production process comprises the processes of molten iron desulfurization, converter smelting, RH treatment,medium-sized slab continuous casting, slab heating and hot rolling; the molten iron desulfurization process is that the molten iron is desulfurized until the content of sulfur is less than or equal to 0.005%; in the converter smelting process, the alkalinity of the final slag is 3.5-4.5, in steel tapping molten steel, the content of carbon is 0.020%-0.045%, the content of sulfur is less than or equal to 0.010%, and the content of phosphorus is less than or equal to 0.010%, the final temperature is larger than or equal to 1690 DEG C, the oxygen at an end point is controlled within the range of500-900 ppm, a molten steel sample is not taken after converter carbon pulling, the steel is discharged directly after bottom blowing and forceful stirring, and the steel discharge time is longer than or equal to 3 minutes; and in the RH treatment process, a deep-decarbonization module is adopted, the decarbonization time is longer than or equal to 14 min, the amount of RH oxygen blowing is controlled to be less than or equal to 100 m<3>, and the vacuum cycling time after alloy is added is longer than or equal to 8 min. According to the production process, the control is stable, and the totaloxygen and carbon contents in the molten steel can be effectively controlled; and the shortages on the hot rolling surface are reduced, the B-type inclusion of the inclusion grade in hot rolling baseplate is controlled under 1.5 grades in terms of the fine series.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy technology, in particular to a production process of a steel substrate for a high-quality filter. Background technique [0002] The steel used for automotive filters is made of cold-rolled deep-drawing steel raw materials for deep-drawing processing, and the thinnest position can reach less than 0.4mm. If the size and quantity of steel inclusions are too large, blisters will easily appear during the stamping and thinning process. Defects, so the control of inclusions in this type of steel is stricter. At present, the composition of steel for filters mostly adopts ultra-low carbon steel components, the brand is SPHETi, and its composition range is as follows (wt): C≤0.01%, Si≤0.80%, Mn≤0.30%, P≤0.012%, S≤ 0.012%, Alt≥0.020%, Ti≥0.030%, and the balance is Fe and unavoidable impurities. [0003] The production process of ultra-low carbon steelmaking mainly includes: hot metal desu...

AI Technical Summary

Problems solved by technology

In particular, it is very difficult to produce steel for filters with a 100t converter and a matching medium slab continuous caster, because the nominal capacity of the converter is small, the temperature drop of molten steel in the entire steelmaking process is difficult to control, and the RH process is easy to blow oxygen, and then In addition to the pollution of refractory materials in continuous casting, it is a challenging and innovative task to control the cleanliness of steel used in filters

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