Rolling stainless steel
The stages of steel rolling
First the steel ingots arrive at the largest rolling mills, which are known as slabbing and blooming mills. These mills are also called crimping mills, where steel ingots are crimped, giving them the form of a long bar (bloom) or plate (slab), which later serve as billets for the manufacture of various stainless steel products. Up to 6 million stainless steel ingots are processed at slabbing and blooming plants annually. The ingots can weigh from 1 to 18 tons. More modern plants are equipped with equipment that allows stainless steel to be poured into finished blooms and slabs. Crimping units operate only at plants where the process involves casting steel into ingots. After preliminary crimping, the stainless steel billets end up in the rolling mills, where they acquire a specific profile, desired shape and thickness by means of rolling mills. The supplier Auremo offers high quality products.
Crimping on a blooming mill
Crimping starts with a stainless steel ingot being heated for 4-6 hours in a special heating well, where the temperature reaches 1100-1300°C. The main parts of the blooming mill are two giant rolls with an adjustable gap between them. The preheated ingot is placed on a roller conveyor and transported to the rollers. The operator pulls the ingot through these rolls, with each new pass the gap between the rolls is reduced. Every 5 to 6 passes the ingot is turned over. At the final stage the processed ingot is moved along the roller conveyor to the industrial shears that cut it into blooms of the required size.
Slab rolling
The rolling of stainless steel on a slabbing mill is analogous to the above-described procedure, the only difference being that the ingot is crimped by four rolls - two vertical and two horizontal. The long plate of stainless steel thus obtained is also cut into individual slabs using shears.
Final shaping
To produce the stainless steel plate, the slab arrives at the mill, where smooth rolls are used. Rails, beams, channels and other shaped products are produced from blooms, which are rolled on rail-rolling mills, with cut-outs of the desired shape. The process consists of multiple passes. The product is formed sequentially and gradually. The desired thickness is reached by the last final rolling. The process is accelerated by the multiple passing of the red-hot bloom over a roller table through a series of stands with rolls of the desired shape and calibre. Continuous rolling mills are able to roll at speeds of up to 80 m/s. The mill can produce up to 6 million tons of rolled steel per year.
Furnizor
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