Compact production process for mid-wide strip steel

Abstract

The invention discloses a compact production process for mid-wide strip steel. The compact production process for the mid-wide strip steel comprises the following steps that S1, a desulfurizing agentis added to a molten iron surface, air is blown in through a vent plug installed at the bottom of a molten iron ladle, molten iron is stirred for desulfurizing, and hten the molten iron is added intoa converter or an electric stove for smelting; S2, a molten steel ladle is hoisted to a molten steel refining furnace, molten steel and alloy fine-tuning components are added to make the temperature and components of the molten steel be uniform, accordingly inclusions are further reduced, and after the specified requirements are met, the molten steel ladle is hoisted to a ladle turret of a continuous casting machine according to the requirement of the technical time rhythm; and S3, a tundish is preheated at the temperature of 1200-1250 DEG C, afterwards the molten steel is poured into the tundish, the degree of superheat is controlled to be 20-60 DEG C, andwater gaps of the tundish are distributed to crystallizers. According to the compact production process for the mid-wide strip steel, the configured procedures are compact and reasonable, logistics is smooth, the temperature is matched and suitable, the subsequent product processing procedures and cost are reduced, the product quality is improved, energy is saved, and the production process meets the national policy of energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of strip steel production, and in particular relates to a compact medium and wide strip steel production process. Background technique [0002] At present, the domestic strip steel production situation is basically that the wide-band steel continuous rolling mill and the narrow-strip continuous rolling mill are in the majority, and the compact continuous casting and continuous rolling production line of the middle and partial wide-band steel is still blank. For strip steel with a width of 600-1300mm, the market demand is not small, but the existing narrow strip steel production line cannot produce it, and the wide strip steel production line is unwilling to produce it due to technical and economic reasons, and it is not suitable for production. The technology of conventional slab continuous casting machine with hot continuous strip rolling mill for producing strip steel coils has the advantages of complete p...

AI Technical Summary

Problems solved by technology

The technology of conventional slab continuous casting machine with hot continuous strip rolling mill for producing strip steel coils has the advantages of complete production varieties and large production scale. However, due to the large radius of the continuous casting machine and multiple roughing stands, the overall system The weight of the equipment is heavy, the production line is long, the plant area is large, and the investment is large

At the same time, there needs to be a large intermediate slab warehouse as a buffer between the continuous casting machine and the rolling line, which increases the investment

The average furnace temperature of the continuous casting slab is only 500-600°C. Even if it is hot charging, the average hot charging rate is only about 65%, and the energy saving effect is not obvious.

The slab is rolled many times in the rough rolling area, the time is long, the heat loss of the slab is large, and a higher temperature is required. At the same time, in order to compensate for the temperature difference between the head and the tail of the intermediate slab, the finishing rolling unit must use increased speed rolling, requiring motors The capacity is large, and the shape of the product is difficult to control