Boron-steel-containing mold flux dedicated for continuous casting

A mold powder and continuous casting technology, applied in the field of metallurgical auxiliary materials, can solve problems such as edge cracks on the surface of the casting billet

Active Publication Date: 2012-10-24
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the common problem of cracks at the edge of the boron-containing steel slab, the present invention provides a special mo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A mold mold powder for continuous casting of boron-containing steel, the chemical composition of which is as follows: CaO 37.12%, SiO2 26.14%, Al2O3 2.64%, Na2O 7.22%, MgO 1.09%, F — 7.29%, MnO 2.86%, C 7.10%, Li2O 0.94%. Physical properties of mold flux, melting point 1105°C, viscosity 0.13Pa·S at 1300°C, melting speed 21 seconds.

Embodiment 2

[0017] A mold mold powder for boron-containing steel continuous casting, its chemical composition mass percentage is as follows: CaO 36.70%, SiO2 24.45%, Al2O3 3.51%, Na2O 7.46%, MgO 1.52%, F — 6.29%, MnO 2.36%, C 6.60%, Li20 1.17%. Mold flux physical properties: melting point 1115°C, viscosity 0.14Pa·S at 1300°C, melting speed 20 seconds.

Embodiment 3

[0019] A special mold powder for boron-containing steel continuous casting, its chemical composition mass percentage is as follows: CaO 39.4%, SiO2 25.25%, Al2O3 3.48%, Na2O 8.56%, MgO 1.68%, F — 6.36%, MnO 3.24%, C 7.52% Li2O 0.58%. Physical properties of mold flux, melting point 1105°C, viscosity 0.13Pa·S at 1300°C, melting speed 21 seconds.

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Abstract

The invention discloses boron-steel-containing mold flux dedicated for continuous casting, comprising the following chemical ingredients by mass: 34-40% of CaO, 23-27% of SiO2, 2-4% of Al2O3, 6-8% of F, 1-2% of MgO, 2-4% of MnO, 7-9% of Na2O, 5-8% of C and 0.1-1.5% of Li2O. Experiments on site prove that boron-steel-containing 15MnVB and S400B are cast in a slab casting machine with specification of 200*900-1200mm <2> in a steel mill under the condition that the stable casting speed is 1.60m/min, the flux consumption is 0.38Kg/steel T; and no caking occurs in the process of melting the mold flux, no flux strip exists at molten steel meniscus, the thickness of a melt cinder layer on a molten steel surface is 10-15mm, the stable and even heat flux around a crystallizer is observed by a heat flow curve to be stable and uniform, and the frictional force of the crystallizer is stable. Therefore, the experiments show that heat transmission and lubrication performances of the mold flux are good.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, in particular to mold mold powder specially used for continuous casting of boron-containing steel. Background technique [0002] Boron-containing (B) steel is a low-alloy structural steel that replaces Cr and Ni on the basis of B and Mn. Adding trace amounts of boron (0.0010-0.050 wt%) to some mechanical manufacturing steels can significantly improve hardenability and Fatigue resistance, excellent comprehensive performance, my country's Cr and Ni resources are in short supply, but boron resources are abundant, the development of boron-containing steel can save a lot of precious elements, and at the same time can obtain excellent mechanical properties. Boron is one of the most active elements, which can combine with residual nitrogen and oxygen in molten steel to form inclusions and lose its beneficial effect. Only boron in solid solution in steel can play a beneficial rol...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 王庆来王庆德武金波张国令李秀峰罗志刚李党军朱云峰唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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