Slab burial pit with adjustable cooling speed

Abstract

The invention discloses a slab burial pit with an adjustable cooling speed. The slab burial pit comprises a pit body, a pit cover, a pit wall, a heating burner, an air door and a chimney, wherein the pit body is encircled by the pit wall, and buried under the ground; the pit cover is covered on the top; the heating burner is arranged at one side; the air door and the chimney are arranged at the other opposite side; the opening of the air door is adjustable. By adopting the technical scheme disclosed by the invention, the slab temperature can be flexibly adjusted according to the production rhythms of the upper and lower procedures, the slab is prevented from generating a stress crack, meanwhile, the capability of simultaneously slowly cooling large quantities of slabs is provided, and the problem of rapid cooling of the slab in fact caused by ambient cold air also can be avoided in the process of storing the slab. Meanwhile, normal logistics above the ground is not affected under the condition that the large quantities of slabs are simultaneously slowly cooled by the pit body arranged below the horizontal plane, and the slow cooling requirements of the slab are completely met.

Description

technical field [0001] The invention relates to a slow cooling pit for stainless steel slabs, more specifically, to a slow cooling pit for slabs with adjustable cooling speed. Background technique [0002] The types of stainless steel are roughly divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel and duplex stainless steel according to their different metallographic structures. Among them, some ferritic stainless steel grades and all martensitic stainless steel grades require slow cooling after slab cutting. [0003] The reason for the slow cooling treatment of ferritic stainless steel slabs is mainly to avoid stress cracks caused by the stress concentration caused by the large amount of interstitial elements such as N and C precipitated at the grain boundaries during the rapid cooling process; the reason for slow cooling treatment of martensitic stainless steel slabs It is to avoid that the stress caused by the volume change in t...

AI Technical Summary

Problems solved by technology

This feature determines that the device can only meet the needs of slow cooling of slabs produced in small batches, such as less than 10 slabs. When large-scale production of slabs that require slow cooling is required, the driving cannot lift and transport 60 to 100 slabs. A single large-volume controlled cold box required by the slab; of course, a small-volume but large-quantity method can also be used to deal with it, but this will cause congestion in the slab yard and affect logistics

[0009] When the slab is hoisted out of the cooling control box, the box needs to be lifted completely, so that the slab is completely exposed to the air environment, which results in rapid cooling in fact, which is inconsistent with the original intention of slow cooling of the slab, and may lead to Generation of Stress Cracks in Slab and Substantial Cooling of Slab

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