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Metal material heat preservation device and heat preservation method thereof

A metal material and heat preservation device technology, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of unstable environmental temperature control of metal materials, affecting product processing quality, and slab edge cooling, etc. Small segregation, simple structure, and the effect of eliminating dendrite segregation

Pending Publication Date: 2019-06-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the stacked slabs that come off the production line in the rolling mill, some steel types need to consider the slow temperature drop. Sometimes due to the rapid drop in the surrounding temperature, the edge of the slab cools faster, which affects the subsequent product processing quality. In the continuous casting plant of the pit, the ambient temperature control of the metal materials that need to be cooled slowly is relatively unstable, resulting in poor performance of the metal materials after slow cooling

Method used

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  • Metal material heat preservation device and heat preservation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, the thickness of the hollow cavity of the metal material heat preservation device is 50mm.

[0031] Put the cross-section that needs to be cooled slowly after heat treatment into a round billet with a diameter of 500mm and a material of 40Cr hot billet, put it into the inner liner 1 of the vacuum insulation device, fasten the upper cover with the box body, and connect the air outlet 301 of the outer shell Connect with one end of the exhaust pipe 302, connect the vacuum pump with the other end of the exhaust pipe 302, then use the vacuum pump to evacuate the hollow cavity 7 of the box to 50Pa, and then close the exhaust pipe 302; connect the outer cover exhaust pipe 602 to the outer cover On the suction port 601, the vacuum pump is connected with the suction pipe 602 of the outer cover, and the hollow cavity 8 of the upper cover is evacuated to 50 Pa by the vacuum pump, and then the suction pipe 602 of the outer cover is closed.

[0032] After testing...

Embodiment 2

[0034] In this embodiment, the thickness of the hollow cavity of the metal material heat preservation device is 5mm.

[0035] Put the cross-section that needs to be cooled slowly after heat treatment into a round billet with a diameter of 500mm and a material of 40Cr hot billet, put it into the inner liner 1 of the vacuum insulation device, fasten the upper cover with the box body, and connect the air outlet 301 of the outer shell Connect with one end of the exhaust pipe 302, connect the vacuum pump with the other end of the exhaust pipe 302, then use the vacuum pump to evacuate the hollow cavity 7 of the box to 5 Pa, and then close the exhaust pipe 302; connect the outer cover exhaust pipe 602 to the outer cover On the suction port 601, the vacuum pump is connected with the suction pipe 602 of the outer cover, and the hollow cavity 8 of the upper cover is evacuated to 5 Pa through the vacuum pump, and then the suction pipe 602 of the outer cover is closed.

[0036] After test...

Embodiment 3

[0038] In this embodiment, the thickness of the hollow cavity of the metal material heat preservation device is 80 mm.

[0039] Put the cross-section that needs to be cooled slowly after heat treatment into a round billet with a diameter of 500mm and a material of 40Cr hot billet, put it into the inner liner 1 of the vacuum insulation device, fasten the upper cover with the box body, and connect the air outlet 301 of the outer shell Connect with one end of the exhaust pipe 302, connect the vacuum pump with the other end of the exhaust pipe 302, then use the vacuum pump to evacuate the hollow cavity 7 of the box to 100Pa, and then close the exhaust pipe 302; connect the outer cover exhaust pipe 602 to the outer cover On the suction port 601, the vacuum pump is connected with the suction pipe 602 of the outer cover, and the hollow cavity 8 of the upper cover is evacuated to 100 Pa by the vacuum pump, and then the suction pipe 602 of the outer cover is closed.

[0040] After testin...

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Abstract

The invention discloses a metal material heat preservation device and a heat preservation method thereof. The metal material heat preservation device comprises an upper cover and a box body, a hollowcavity is additionally installed outside a box body and an upper cover, the cooling rate of a metal material is adjusted by adjusting the vacuum degree in the hollow cavity, so that slow cooling requirements of the metal material in different environments can be adapted, and a heat preservation pit does not needed, the heat transfer uniformity of a temperature field in the slow cooling process ofthe metal material is higher, the dendritic crystal segregation of the metal material is easily eliminated, and the quality of the metal material is improved; the heat preservation device is simple instructure, reasonable in design, simple and controllable in the cooling rate and wide in application range, the storage is convenient, and the site and cost are saved; the thickness of the hollow cavity is adjusted and the vacuum degree in the hollow cavity is adjusted, the device can be suitable for the slow cooling requirements of different metal profiles in different environments, avoids segregation, cracking and abnormal deformation risks after high-temperature quenching of the metal material, the mechanical property of the metal material is improved, the segregation is small, and the hardness distribution is uniform.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a metal material heat preservation device and a heat preservation method thereof. Background technique [0002] For the stacked slabs that come off the production line in the rolling mill, some steel types need to consider the slow temperature drop. Sometimes due to the rapid drop in the surrounding temperature, the edge of the slab cools faster, which affects the subsequent product processing quality. In the continuous casting plant of the pit, the ambient temperature control of the metal materials that need to be cooled slowly is relatively unstable, resulting in poor performance of the metal materials after slow cooling. Contents of the invention [0003] The purpose of the present invention is to solve the problems existing in the prior art, to provide a metal material heat preservation device and its heat preservation method, by installing a hollow cavity outside the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/773C21D1/84C22F1/02C22F1/04C22F1/08B21B45/02
Inventor 周建安吴江江周亮
Owner WUHAN UNIV OF SCI & TECH