Continuous casting crystallizer casting powder for large circular blank abrasion resisting high manganese steel

A continuous casting mold and mold powder technology, which is applied in the field of continuous casting mold mold powder for wear-resistant high manganese steel of large round billets, can solve the problems of high production cost, sticking breakout, high viscosity, etc., and achieve reduction The effect of bonding breakout risk, reducing shrinkage resistance, and avoiding uneven heat transfer

Active Publication Date: 2014-05-28
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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AI Technical Summary

Problems solved by technology

[0003] Continuous casting round slabs are prone to surface defects due to unfavorable factors in their shape, which may lead to breakout accidents in severe cases
In the continuous casting process of wear-resistant high manganese steel, its linear shrinkage value is 2.4-3.5%, which is more than twice that of carbon steel. Large internal stress, prone to unpredictable accidents in the continuous casting process
[0004]For the continuous casting of this type of steel, the current domestic mold powder products mainly rely on imports. The existing problems are: ①The cost of mold powder is high, resulting in the ② The imported slag cannot be effectively adjusted in time according to the specific process conditions in our country, and it is difficult to meet the actual needs; The quality of mold slag is easy to deteriorate during use, resulting in unsmooth process and many surface quality problems of slab, which increases the production cost of iron and steel enterprises
[0005] In the document "Application Research on Mold Flux for Medium-Carbon High-Manganese Steel with Large Section of Round Billet", the final designed formula composition is: SiO2: 34.45%, Al2O3: 6.25%, Fe2O3 1.83%, CaO: 27.28%, MgO: 1.08%, K2O: 0.2%, Na2O: 4.41%, F-: 3.81%, C Solid: 18.25%, H2O 0.3%; alkalinity 0.79, melting point 1205°C, viscosity 8.47 poise. During the cooling process, the number of crystals is small, the heat transfer effect is not ideal, and cracks will still occur, and the MnO in the molten steel is easy to be enriched in the slag, and the bonding breakout phenomenon is easy to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A mold powder for continuous casting mold designed for high manganese wear-resistant steel with large round billets in a factory. The raw material formula is: wollastonite 58%, bauxite 4.7%, carbon black 3%, graphite 1.3%, fluorite 10.2% %, sodium carbonate 2.3%, lithium carbonate 6%, calcite 5.1%, manganese carbonate 5.4%, dextrin 1%, light burnt magnesia 3%.

[0023] Mold flux was prepared by conventional technology, and the test results of its main physical and chemical indicators are as follows: CaO: 29.7%, SiO 2 : 34.9%, MgO: 3.7%, LiO 2 : 3.6%, Al 2 o 3 : 6.2%, Na 2 O: 8.8%, F - : 6.7%, MnO: 2.8%, C: 3.2%, balance: impurities.

[0024] The alkalinity of the mold slag is CaO / SiO 2 It is 0.85, the melting point is 1132°C, and the viscosity at 1300°C is 0.45Pa.s.

[0025] When pouring starts, the adjusted mold slag is pushed into the mold. After observation, the fluctuation of the liquid steel level is within 3mm, and the casting speed is stable at 0.45 m / min....

Embodiment 2

[0027] A mold powder for continuous casting mold designed for large round billets of high manganese wear-resistant steel in a factory. The raw material formula is: 56.7% wollastonite, 5.2% bauxite, 3% carbon black, 1.5% graphite, 12.4% fluorite %, Sodium Carbonate 2.1%, Lithium Carbonate 6.7%, Calcite 4.9%, Manganese Carbonate 3.1%, Vegetable Starch 1%, Light Burnt Magnesia 3.4%.

[0028] Mold powder was prepared by conventional technology, and the test results of its main physical and chemical indicators are as follows: CaO: 31.1%, SiO 2 : 32.4%, MgO: 4.1%, LiO 2 : 4.2%, Al 2 o 3 : 6.5%, Na 2 O: 8.2%, F -: 7.2%, MnO: 2.7%, C: 3.4%, balance: impurities.

[0029] The alkalinity of the mold slag is CaO / SiO 2 It is 0.97, the melting point is 1125°C, and the viscosity at 1300°C is 0.56Pa.s.

[0030] When pouring starts, the adjusted mold slag is pushed into the mold. It is observed that the fluctuation of the molten steel level is within 3mm, and the casting speed is st...

Embodiment 3

[0032] A mold powder for continuous casting mold designed for large round billets of high manganese wear-resistant steel in a factory. The raw material formula is: 57.4% wollastonite, 5.8% bauxite, 3% carbon black, 2% graphite, 9.8% fluorite %, 1.5% sodium carbonate, 5% lithium carbonate, 5.5% calcite, 3.2% manganese carbonate, 0.8% sodium carboxymethyl cellulose, 6% calcined magnesia.

[0033] Mold flux was prepared by conventional technology, and the test results of its main physical and chemical indicators are as follows: CaO: 29%, SiO 2 : 30%, MgO: 6%, LiO 2 : 3%, Al 2 o 3 : 7.8%, Na 2 O: 8%, F - : 6%, MnO: 2%, C: 8%, balance: impurity.

[0034] The alkalinity of the mold slag is CaO / SiO 2 It is 0.96, the melting point is 1125°C, and the viscosity at 1300°C is 0.51Pa.s.

[0035] When pouring starts, the adjusted mold slag is pushed into the mold. After observation, the fluctuation of the liquid steel level is within 3.5mm, and the casting speed is stable at 0.6m / min...

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Abstract

The invention discloses continuous casting crystallizer casting powder for large circular blank abrasion resisting high manganese steel. According to the continuous casting crystallizer casting powder for the large circular blank abrasion resisting high manganese steel, cracks are reduced by adopting low carbon amount and high viscosity, reducing thermal stress inside blank shells and increasing powder consumption amount. The alkalinity of the casting powder is 0.8-1.1, the cracks caused by uneven heat transmission are avoided; through the adoption of 8-12% of Na2O, 6-8% of F- and 3-4.5% of Li2O, weak coldness and even heat transmission of the upper portion in a crystallizer are achieved, inclusion absorbing effects are improved, and the cracks are reduced; through the adoption of 2-8% of MnO, lattice vibration and conduction heat transmission are weakened, and the crystallization properties of the casting powder and the casting blank quality are improved. Raw materials of the continuous casting crystallizer casting powder for the large circular blank abrasion resisting high manganese steel are easy to obtain, and production cost is low. Through field testing, the casting power is good in spreadability and good in air permeability and can be smelted stably and be free of caking, the consumption amount of the casting powder is around 0.3-0.42kg per ton of steel, the consumption cost is relatively low, and the qualified rate of the first grate casting blanks is improved significantly.

Description

technical field [0001] The invention belongs to the technical field of preparation of auxiliary materials for steelmaking, and in particular relates to a mold slag for continuous casting molds for large round billet wear-resistant high manganese steel. Background technique [0002] Wear-resistant high-manganese steel is especially suitable for impact abrasive wear and high-stress crushing abrasive wear conditions. It is often used in the manufacture of ball mill liners, hammer crusher hammers, jaw crusher jaws, and cone crushers. Impact-resistant and wear-resistant castings such as excavator bucket teeth and bucket walls, railway turnouts, track shoes of tractors and tanks. [0003] Continuous casting round billets are prone to surface defects due to unfavorable factors in their shape, which may lead to breakout accidents in severe cases. In the continuous casting process of wear-resistant high manganese steel, its linear shrinkage value is 2.4-3.5%, which is more than twi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 薄红涛张福王旭阳马晓娜杜震宇庞炎梁冠东
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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