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Control method of continuous casting of different steel grades

A control method and technology of different steel types, applied in the field of metallurgical continuous casting, can solve the problems of not reducing the billet volume, increasing the amount of molten steel, and easily producing joint marks, so as to improve the continuous casting process of different steel types and reduce the The degree of mixing, the effect of reducing the fluctuation of casting speed

Active Publication Date: 2018-05-18
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, if the tonnage control of the tundish is too low, it will cause production quality accidents such as slag entrainment, and the casting speed is too low when the next heat is poured, which is similar to a shutdown, which is prone to joint marks and is too low. The mixing time of molten steel, the pouring flow rate of the next steel ladle is too large, which also increases the amount of molten steel involved in mixing, which cannot reduce the amount of handover billet very well

Method used

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  • Control method of continuous casting of different steel grades
  • Control method of continuous casting of different steel grades
  • Control method of continuous casting of different steel grades

Examples

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Effect test

Embodiment 1

[0050]The steel grades of the heats before and after the present embodiment are respectively MR T2(3)-BA and MR T-4CA, and the casting cross-sections of both streams are 1000mm, and the corresponding steel grade compositions are as follows:

[0051] The mass percent of MR T2(3)-BA composition is:

[0052] C:0.068-0.094; Si≤0.034; Mn:0.35-0.45; Cr:0.03-0.05; O≤0.004;

[0053] The rest is Fe and inevitable impurity elements.

[0054] The mass percentage of MR T-4CA composition is:

[0055] C:0.026-0.054; Si≤0.034; Mn:0.18-0.28; Cr≤0.05;

[0056] The rest is Fe and inevitable impurity elements.

[0057] : the steps of this embodiment are:

[0058] ①When the molten steel level reaches the height of the dam, the corresponding M=20t, take l 1 = 2m, l 2 =6m, η=0.25, then calculate the remaining steel amount M of the previous steel type according to the formula 0 for:

[0059]

[0060] ②Slab thickness D=0.23m, V 0 =0.8m / min, V 1 = 0.4m / min, t 0 = 3.5min, t 1 =50s, then ...

Embodiment 2

[0078] The steel grades of the heats before and after this embodiment are T5-5 and SAE1022 respectively, and the casting cross-sections of both streams are 1090mm, and the corresponding steel grade components are as follows:

[0079] The mass percentage of T5-5 composition is:

[0080] C; 0.115-0.145; Si≤0.034; Mn:0.25-0.35; N≤0.0045; Nb≤0.002; V≤0.005;

[0081] The rest is Fe and inevitable impurity elements.

[0082] The mass percentage of SAE1022 composition is:

[0083] C: 0.18-0.22; Si≤0.054; Mn: 0.85-1; Nb≤0.007; V≤0.007; Ti≤0.007;

[0084] The rest is Fe and inevitable impurity elements.

[0085] The steps of this embodiment are:

[0086] ①When the molten steel level reaches the height of the dam, the corresponding M=20t, take l 1 = 2m, l 2 =6m, η=0.3, then calculate the remaining steel amount M of the previous steel type according to the formula 0 for:

[0087]

[0088] ②Slab thickness D=0.23m, V 0 =0.8m / min, V 1 = 0.4m / min, t 0 = 4min, t 1 =50s, then th...

Embodiment 3

[0106] The steel grades of the heats before and after this embodiment are Q345B and S245 respectively, and the casting cross-sections of both streams are 1530mm, and the corresponding steel grades are as follows:

[0107] The mass percentage of Q345B composition is:

[0108] C:0.12-0.16; Si:0.15-0.25; Mn:1.1-1.2; N≤0.006; V≤0.014; Ti:0.025-0.035; Cr≤0.03;

[0109] The rest is Fe and inevitable impurity elements.

[0110] The mass percentage of S245 composition is:

[0111] C: 0.075-0.125; Si: 0.11-0.2; Mn: 0.9-1.1; N≤0.009; V≤0.007; Ti≤0.007; Cr≤0.05;

[0112] The rest is Fe and inevitable impurity elements.

[0113] The steps of this embodiment are:

[0114] ①When the molten steel level reaches the height of the dam, the corresponding M=20t, take l 1 = 2m, l 2 =6m, η=0.45, then calculate the remaining steel amount M of the previous steel type according to the formula 0 for:

[0115]

[0116] ②Slab thickness D=0.23m, V 0 =0.8m / min, V 1 = 0.4m / min, t 0 = 5min, t ...

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Abstract

The invention relates to a control method for continuous casting of the different steel grade. The method comprises the following steps: firstly, according to the shape and structural parameters of a tundish flow control device, the mixed casting tonnage M is determined, and the value is the molten steel amount correspondingly when the height of the liquid level of the molten steel in a tundish is the height of a retaining dam; according to following formulas, the remaining steel amount of the previous steel grade is determined as Mo (shown in the specification), and when casting of a molten steel large ladle of a previous furnace is finished, speed begins to be slowly reduced; the mixed casting initial tonnage of the tundish is M1, the pull speed is reduced to the lowest pull speed V0 during normal production of the steel grade, and the retaining time is t0; thirdly, according to the casting cross section, the large ladle cast-on tonnage is selected, when the remaining weight of the tundish is M2, the pull speed is reduced to V1 from V0, and large ladle cast-on operation is carried out; fourthly, after large ladle cast-on operation, the amount of molten steel of the tundish is kept M, the pull speed is kept V1, after t2, the pull speed rises to V0, the reference formula of t2 is shown in the specification, the pull speed rises to V0, meanwhile, the molten steel amount of the tundish is kept M, after the retaining time t3 is equal to 5 min to 8 min, the opening degree of a sliding plate of the large ladle is gradually increased, the tonnage of the tundish rises to the normal casting tonnage, and the pull speed rises to the normal production target value.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for continuous casting of different steel types, and belongs to the technical field of metallurgical continuous casting. Background technique [0002] With the development of society, people demand more and more types of steel. Under the fierce market competition mechanism, steel companies have to produce high-quality pure steel with different components in small batches. Multi-furnace continuous casting of different steel types is beneficial to increase the pure working time of the casting machine, improve the production efficiency and production capacity of the continuous casting machine, not only reduce the production cost, but also meet the market demand. However, as the continuous casting rate of different steel types has been continuously increased in recent years, its impact has become increasingly prominent. When two steel types with a relatively large composition gap ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
Inventor 李涛周秀丽杨金成赵建强曾昌富
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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