Medium-thick plate production process

Abstract

The present invention relates to a production process of heavy and medium plate. Said process includes the following steps: heating slab, removing scale, rolling by using rolling mill, laminar flow cooling, thermal straightening by using heat straightening machine, trimming by using trimming shear and cut-to-length by using cut-to-length shear.

Description

【Technical field】 [0001] The invention relates to a medium-thick plate production process, in particular to a medium-thick plate production process suitable for the production of blanks of various specifications. 【Background technique】 [0002] At present, the production process of the existing wide and medium plate rolling mill production line is generally: continuous casting slab → slab heating furnace heating → descaling → rolling mill rolling → laminar cooling → steel plate hot leveling machine leveling → cooling bed cooling → Edge trimming and edge trimming → Cutting to length and length cutting → Marking printing → Finished product collection and processing. In this process, when long blanks with large unit weight are selected, the intermediate products after rolling by the rolling mill cannot be processed due to their large size. It is successfully sent to the cooling bed, so the range of billet specifications that this process can adapt to is small, the production ef...

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Problems solved by technology

[0002] At present, the production process of the existing wide and medium plate rolling mill production line is generally: continuous casting slab → slab heating furnace heating → descaling → rolling mill rolling → laminar cooling → steel plate hot leveling machine leveling → cooling bed cooling → Edge trimming and edge trimming → Cutting to length and length cutting → Marking printing → Finished product collection and processing. In this process, when long blanks with large unit weight are selected, the intermediate products after rolling by the rolling mill cannot be processed due to their large size. It is successfully sent to the cooling bed, so the range of billet specifications that this process can adapt to is small, the production efficiency of the rolling mill is low, and the low hit rate of fixed length and the large amount of cutting head and tail will affect the steel yield;

[0003] In order to solve the problem of long billets, a flying shear is installed behind the four-high rolling mill when the existing manufacturer builds a new wide and medium plate rolling mill production line. Carry out slitting to ensure that the intermediate products after rolling are sent to the cooling bed smoothly, but the investment of flying shears is large. The investment of a flying shear is about 30 million yuan, and the shearing capacity is limited. Generally, only cutting thickness less than 25mm, width less than 2500mm rolling mill rolling products, especially when the long plate is cut by flying shears, the long steel plate cannot be stopped, and any length can be cut according to the camber of the intermediate product after rolling, which will affect the edge trimming of the finished product. Steel yield

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