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Method for determining head and tail positions and length of mixed cast blank based on continuous molten steel temperature measurement

A technology for mixing billet and molten steel is applied in the field of testing, which can solve problems such as large workload and reduce metal yield, and achieve the effects of improving mixed casting efficiency, improving economic benefits, and improving yield.

Active Publication Date: 2015-12-02
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can determine the length of the mixed billet, the workload is relatively large, and more importantly, the metal yield will be reduced

Method used

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  • Method for determining head and tail positions and length of mixed cast blank based on continuous molten steel temperature measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Such as figure 1 As shown, a method for determining the position and length of the head and tail of the mixed billet based on continuous temperature measurement of molten steel takes the following steps:

[0020] When mixing Q345 and IF steel, the casting temperature of Q345 is 1530°C, the casting temperature of IF steel is 1560°C, and the casting speed is 1.2m / min.

[0021] 1) At the end of Q345 steel casting, when the remaining molten steel in tundish 1 is 10% of the total, the nozzle is closed, the continuous casting machine is stopped, and tundish 1 is raised, so that the submerged nozzle is exposed 60mm above the billet shell;

[0022] 2) Add molten steel splitting agent into the crystallizer 2, the molten steel splitting agent is composed of iron powder and rolled steel sheet, and the mass percentage of the composition of the molten steel splitting agent is: iron powder: 100%, rolled steel sheet: 0%, and the average particle size of iron powder and r...

Embodiment 2

[0027] The basic process of a new method of determining the position and length of the head and tail of the mixed cast slab based on the continuous temperature measurement technology of molten steel in this embodiment is the same as that in embodiment 1, except that the continuous temperature measurement device is installed at the upper part of the nozzle 4 of the tundish 200mm, The average particle size of iron powder and rolled steel sheet is: 300-500μm.

[0028] 60Si 2 Mn steel and 45 # Steel, of which 60Si 2 Mn steel casting temperature is 1480℃, 45 # The steel casting temperature is 1530°C.

[0029] A method of determining the position and length of the head and tail of the mixed cast slab based on continuous temperature measurement of molten steel in this embodiment takes the following steps:

[0030] 1) In 60Si 2 At the end of Mn steel casting, when the remaining molten steel in the tundish 1 is 15% of the total amount, close the nozzle, stop the continuous casting...

Embodiment 3

[0036] The basic process of a new method of determining the position and length of the head and tail of the mixed cast slab based on the continuous temperature measurement technology of molten steel in this embodiment is the same as that in embodiment 1, except that the continuous temperature measurement device is installed on the nozzle 4 of the tundish 300mm away.

[0037] 60Si 2 Mn steel and 45 # Steel, of which 60Si 2 Mn steel casting temperature is 1480℃, 45 # The steel casting temperature is 1530°C.

[0038] A method of determining the position and length of the head and tail of the mixed cast slab based on continuous temperature measurement of molten steel in this embodiment takes the following steps:

[0039] 1) In 60Si 2 At the end of Mn steel casting, when the remaining molten steel in the tundish 1 is 20% of the total amount, the nozzle is closed, the continuous casting machine is stopped, and the tundish 1 is raised so that the submerged nozzle is exposed 130mm...

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Abstract

The invention relates to a method for determining the head and tail positions and the length of a mixed cast blank based on continuous molten steel temperature measurement. The method includes the following steps that when the residual amount of molten steel in a tundish reaches the allowed lowest slag entrapment liquid level, a nozzle is closed, and a continuous casting machine is shut down; a molten steel dividing agent is added into a crystallizer, another kind of steel is added into the tundish, and the adding position of the molten steel dividing agent is the tail end of the mixed cast blank, namely the position B; the continuous casting machine is started and then is shut down when the liquid level in the crystallizer falls below the normal liquid level by 450-500 mm; when the liquid level in the tundish falls to a cast-on position, the nozzle of the tundish is opened, the continuous casting machine operates at the pull speed of v, and timekeeping is started; the temperature of the molten steel in the tundish is detected through a continuous temperature measurement device, after timekeeping is completed, the record time is t, the position is the head end of the mixed cast blank, namely the position A, the distance between the tail end and the head end of the mixed cast blank is the length (L=v*t) of the mixed cast blank, and the head end A of the mixed cast blank meets the formula A=B+L.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for determining the position and length of the head and tail of a mixed cast slab based on continuous temperature measurement of molten steel, and belongs to the technical field of continuous steel casting. Background technique [0002] With the continuous refinement of steel types, customer order contracts also present the characteristics of small batches, multiple varieties, multiple specifications, and strict delivery time. The post-process production has the characteristics of group batching and cross-increasing, which increases the complexity of steelmaking production organization. In order to reduce the switching in the continuous casting production process and improve the continuity of continuous casting production, the continuous casting technology of different steel types is often used. A cast slab that neither belongs to the former steel nor to the latter steel is called a...

Claims

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Application Information

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IPC IPC(8): B22D11/16
Inventor 陈开义江中块田建良邹世文杨江涛宣海林
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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