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Continuous casting method of dissimilar stainless steel

A stainless steel and continuous casting technology, applied in the field of dissimilar stainless steel continuous casting, can solve the problems of increased labor intensity of workers, low number of tundish continuous casting furnaces, and low operation rate of continuous casting machines, so as to improve continuous casting productivity and increase medium The effect of enclosing the number of continuous pouring furnaces and improving the operation rate of equipment

Active Publication Date: 2013-11-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages caused by this method mainly include:
[0003]1. The number of single pouring or double pouring is more, and the number of tundish continuous pouring furnaces is low;
[0004]2. Under the condition of the same output, more tundishes are used, which increases the cost of continuous casting;
[0005]3. The number of stop pouring is too many, and the secondary organization starts pouring, which increases the labor intensity of workers;
[0006]4. Long downtime and low operation rate of continuous casting machine

Method used

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  • Continuous casting method of dissimilar stainless steel
  • Continuous casting method of dissimilar stainless steel
  • Continuous casting method of dissimilar stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment is the actual production situation of 430 and 0Cr13R continuous casting of different steel types in the same tundish, with 430 in front and 0Cr13R in the back. The section of the two steel types is 1240mm, and the mass percentages of the two steel types are as follows:

[0033] The mass percent of the composition of 430 is:

[0034] C: 0.030-0.060; Si: 0.20-0.50; Mn: 0.30-0.50; Cr: 16.00-16.80;

[0035] The rest is Fe and inevitable impurity elements.

[0036] The target temperature for the 430 is 1525-1535°C.

[0037] The mass percentage of the composition of 0Cr13R is:

[0038] C: 0.02-0.03; Si: 0.25-0.35; Mn: 0.20-0.30; Cr: 12.00-12.50;

[0039] The rest is Fe and inevitable impurity elements.

[0040] The target temperature for 0Cr13R is 1530-1540°C.

[0041] The steps of this embodiment are:

[0042] Ⅰ When the previous furnace of molten steel (430 steel grade) was pulled to the end of ladle pouring, when the tundish molten steel was displ...

Embodiment 2

[0057] This embodiment is the actual production situation of continuous casting of different steel types in the same tundish of 316L and 301B, with 316L at the front and 301B at the back. The cross-section of the two steel grades is 1535mm, and the mass percentages of the components of the two steel grades are as follows:

[0058] The mass percentage of the composition of 316L is:

[0059] C: 0.015-0.025; Si: 0.40-0.60; Mn: 1.10-1.30;

[0060] Cr: 16.50-16.80; Ni: 10.05-10.15; Mo: 2.00-3.00;

[0061] The rest is Fe and unavoidable impurities.

[0062] The target temperature for 316L is 1485-1495°C.

[0063] The mass percentage of the composition of 301B is:

[0064] C: 0.10-0.13; Si: 0.60-0.90; Mn: 0.65-0.90;

[0065] Cr: 16.30-16.65; Ni: 6.65-6.85; Mo≤0.40;

[0066] The rest is Fe and unavoidable impurities.

[0067] The target temperature for 301B is 1490-1500°C.

[0068] The steps of this embodiment are:

[0069] Ⅰ When the ladle of the previous furnace of molte...

Embodiment 3

[0086] This embodiment is the actual production situation of continuous casting of different steel types in the same tundish of 409 and 430, 409 is in front and 430 is in the back. The cross-section of the two steel grades is 1535mm, and the mass percentages of the components of the two steel grades are as follows:

[0087] The mass percent of the composition of 409 is:

[0088] C≤0.001; Si: 0.30-0.50; Mn: 0.10-0.30;

[0089] Cr: 11.00-11.30; Ti: 0.10-0.23; N≤0.010;

[0090] The rest is Fe and unavoidable impurities.

[0091] The target temperature for 409 is 1545-1555°C.

[0092] The mass percent of the composition of 430 is:

[0093] C: 0.030-0.060; Si: 0.20-0.50; Mn: 0.30-0.50;

[0094] Cr: 16.00-16.80; Ti≤0.010; N≤0.060;

[0095] The rest is Fe and unavoidable impurities.

[0096] The target temperature for the 430 is 1525-1535°C.

[0097] The steps of this embodiment are:

[0098] Ⅰ When the previous furnace of molten steel (409) was finished pouring in the la...

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Abstract

The invention relates to a continuous casting method of dissimilar stainless steel. The continuous casting method comprises the following sequential steps of I, slowing down to 0.80 to 1.20 meters per minute for the first time when the previous furnace of molten steel is pulled to the end of large package casting and medium package molten steel remains 8.0 to 12 tons; II, slowing down for the second time when the medium package molten steel remains 4.0 to 8.0 tons and slowing down casting blank pulling to 0.35 to 0.45 meter per minute; III, slowing down the pulling to 0.10 meter per minute when the weight of the medium package molten steel decreases to 1.5 to 2.5 tons, placing a large package into a furnace and starting to cast and enabling the opening degree of a large package sliding plate to be the largest; IV, keeping the 0.10 meter per minute pulling speed within 10 to 60 seconds, speeding up to 0.4 to 0.6 meter per minute and maintaining the pulling speed within 60 to 110 seconds; V, speeding up to 0.6 to 0.8 meter per minute, maintaining the speed within 30 to 90 seconds, speeding up to the target speed and speeding up the casting blank pulling to 0.8 to 1.3 meters per minute. The continuous casting method of the dissimilar stainless steel reduces the production cost and improves the operation rate of casting machine equipment.

Description

technical field [0001] The invention relates to a method for continuous pouring of dissimilar stainless steels. Background technique [0002] At present, when various iron and steel enterprises are carrying out continuous casting of stainless steel slabs, there are often the following two problems. Firstly, there are many varieties and wide ranges of stainless steel required by customers, resulting in a large number of single pouring or double pouring during production scheduling; secondly, due to the large alloy content in the stainless steel composition, the complicated solidification process of molten steel, and the impact on the surface of the slab The quality requirements are relatively strict, resulting in difficulties in continuous pouring of stainless steel and different steel types, and a low success rate. Therefore, each steel mill can only adopt the method of "producing one steel grade in one subcontract" for stainless steel continuous casting production. The di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18
Inventor 蒋朝晖
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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