Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace

Abstract

The invention discloses a process for rolling a thin low-temperature tank box steel plate by using a rolling machine with a single machine frame furnace. The low-temperature tank box steel plate of which the thickness is less than or equal to 11mm is formed by rolling a plate blank of which the thickness is 150mm. The process comprises the following steps of coldly or hotly loading the plate blank in a storehouse, heating the plate blank in a heating furnace, crudely removing scales, finely removing the scales, rolling the plate blank by using a furnace rolling machine, cutting the head or sectioning by using a pair of flying shears, cooling with laminar flow, straightening by using a hot straightening machine, performing air cooling by using a cooling bed, checking the lower surface of a steel plate, cutting two sides, sectioning or sampling by cutting to length, spraying steel seal, stacking the products, and storing the finished products in the warehouse, wherein the temperature for delivering the steel plate from the heating furnace is 1,150 to 1,230 DEG C, the temperature of a rolling furnace in front of the machine and the temperature of a rolling furnace behind the machine are set to be 850 to 950 DEG C, the rolling times is 11, two rolling steps are performed, flat rolling is performed in the first step for 7 times, and rolling is performed in the second step for 4 times. The requirement of refining and organizing crystalline grains can be met according to the plate produced by the invention, and meanwhile, the shape and the performance of the plate are ensured.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a production process of a steel plate, in particular to a process for rolling a thin specification low-temperature tank steel plate by a single-stand furnace coil rolling mill. Background technique [0002] When the medium and heavy plate rolling mill produces thin-gauge low-temperature tank steel plates below 11mm, as the thickness of the steel plate rolling becomes thinner, the temperature drop of the steel plate becomes faster and faster. In general, the temperature distribution is extremely uneven, which is a difficult problem in the field of metallurgy, causing serious consequences: first, the rolling force of the steel plate exceeds the maximum limit, or the steel plate has a quick stop due to the poor shape of the steel plate, which eventually leads to the scrapping of the steel plate; The overall performance of the rolled piece and the shape of the rolled plate are improved. [00...

AI Technical Summary

Problems solved by technology

[0002] When the medium and heavy plate rolling mill produces thin-gauge low-temperature tank steel plates below 11mm, as the thickness of the steel plate rolling becomes thinner, the temperature drop of the steel plate becomes faster and faster. In general, the temperature distribution is extremely uneven, which is a difficult problem in the field of metallurgy, causing serious consequences: first, the rolling force of the steel plate exceeds the maximum limit, or the steel plate has a quick stop due to the poor shape of the steel plate, which eventually leads to the scrapping of the steel plate; The overall performance of the rolled piece and the shape of the rolled plate