The strip hot rolling mill has superior technical and economic indicators and it has developed rapidly. In industrialized countries, before 1950, the output of hot-rolled wide-band steel accounted for about 25% of the total steel output, and it had reached about 50% in the 1970s. The raw material of the hot strip is continuously cast slab or green rolled slab, thickness 130-300mm.
After the slab is heated in a heating furnace, it is sent to a rolling mill and rolled into a strip of 1.00-25.4 mm in thickness and rolled into coils. Rolled steel grades are plain carbon steel, low alloy steel, stainless steel and silicon steel. Its main purpose is to make cold-rolled strip, welded pipe, cold-formed and welded steel materials; or for the production of various structural parts, containers and so on.
Rolling mill of seamless carbon steel hot finished pipe:
The hot strip mill consists of a roughing mill and a finishing mill. Roughing mill components are semi-continuous, 3/4 continuous and all continuous types: 1. Semi-continuous type has a broken scale (remove oxide scale) frame and a reversible frame with vertical roller; 2.3/4 continuous type has two serially arranged racks in series; 3. The fully continuous type consists of 6-7 racks. The finishing rolling mills consist of 5-7 continuously arranged stands and coilers. The strip hot-rolling mill is named according to the length of the roll roll body, and the length of the roll body is 914 mm or more as a wide-band steel rolling mill. The work roll roll length of the finishing mill is 1700mm and it becomes a 1700mm strip hot rolling mill. This rolling mill can produce coils with a width of 1550mm. There are four methods for hot-rolling strips according to product width and production process: hot strip rolling of wide-band steel, reversible hot-rolling of wide-band steel, hot strip rolling of narrow-band steel, and hot-rolled strip steel using planetary rolling mill.