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A continuous casting slag for casting peritectic steel

A technology for continuous casting and slag casting, which is applied in the fields of continuous casting and slag casting for peritectic steel and slag casting for continuous casting molds, can solve the problem of high incidence of longitudinal cracks in the first furnace slab, and achieve The effect of compensating for heat loss and preventing cold steel

Active Publication Date: 2022-07-15
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a continuous casting slag for casting peritectic steel, which mainly solves the technical problem of high incidence of longitudinal cracks in the slab of the first furnace in the process of casting the peritectic steel slab in the existing slab continuous caster

Method used

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Examples

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Embodiment Construction

[0029] The following table lists the chemical compositions and physical properties of three examples of the present invention.

[0030] Table 1 Chemical composition of pouring slag in the embodiment of the present invention, unit: weight percent

[0031] component C T

CaO SiO 2

Al 2 O 3

Na 2 O

MgO Fe 2 O 3

this invention 2-3 30-40 25-35 3-6 8-15 ≤0.5 8-13 Example 1 2.35 34.25 30.08 5.12 13.22 0.12 11.53 Example 2 2.58 33.91 31.39 4.07 10.94 0.35 12.76 Example 3 2.49 36.01 33.55 4.83 11.30 0.21 11.68

[0032] In Examples 1-3 of the present invention, the binary basicity values ​​of the poured slag are 1.14, 1.08, and 1.07, respectively; the melting temperature (hemispheric point temperature) is 1060°C, 1084°C, and 1075°C; and the viscosity at 1300°C is 0.16Pa·s, 0.17Pa·s, 0.16Pa·s.

[0033] The open-cast slag of the present invention is used for the production of peritectic steel. ...

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Abstract

The invention discloses a continuous casting slag for casting peritectic steel, which mainly solves the technical problem of the high incidence of longitudinal cracks in the slab cast by the first furnace of molten steel in the process of casting the peritectic steel slab by the existing slab continuous caster. . The technical scheme adopted in the present invention is: a continuous casting slag for casting peritectic steel, the weight percentage of its components is: SiO 2 25‑35%, CaO 30‑40%, Fe 2 O 3 8‑13%, MgO≤0.5%, Al 2 O 3 3‑6%, Na 2 O 8‑15%, C T 2‑3%, the balance is inevitable impurities. The melting point (hemispheric point temperature) of the pouring slag is 1030-1090℃. The pouring slag of the invention can quickly form slag after being added to the crystallizer, has good heat preservation performance and high heat generation rate, and can effectively reduce the problem of high incidence of longitudinal cracks in the first furnace of the tundish.

Description

technical field [0001] The invention relates to open-casting slag for continuous casting mold in the production of molten steel by slab continuous casting machine, in particular to a continuous-casting open-casting slag for casting peritectic steel, belonging to the technical field of metallurgical auxiliary materials for steelmaking. Background technique [0002] Peritrite steel mainly refers to ordinary carbon steel with a carbon content of 0.08%-0.17%, and is one of the most widely used steel types at present. Since the peritectic steel is in the peritectic region (L+δ-γ) during solidification, the peritectic transformation is likely to occur during the solidification process, resulting in volume shrinkage. And in the shrinking process, the continuous casting billet shell and the mold copper plate are separated to form an air gap, which leads to a decrease in the heat flow of the mold and the thinning of the casting billet shell. Longitudinal cracks originate from the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李玉娣左康林
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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