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Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof

A technology for alloying structural steel and refining slag, applied in the field of steelmaking, can solve the problems of increased equipment maintenance cost, slow melting speed of slag, chronic poisoning of livestock, etc., and achieves significant fluxing effect, light corrosion of furnace lining, and elimination of fluorine pollution.

Inactive Publication Date: 2014-06-11
武钢集团有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of slow melting speed, high melting point and high viscosity of slag in traditional refining slag, CaF 2 , but practice shows that CaF 2 The use of will have many adverse effects: (1) containing CaF 2 The slag erodes the furnace lining seriously, increasing equipment maintenance costs; (2) CaF 2 It reacts with other components in the slag to generate fluorine-containing gas and enters the human body through the respiratory tract, digestive tract and skin, which will cause systemic diseases mainly caused by bone changes; (3) Containing CaF at high temperature 2 The slag will produce a large amount of fluoride, which will cause crop yield reduction and chronic poisoning of livestock if it enters the ecosystem

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  • Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with specific embodiments.

[0028] The preparation method of the fluorine-free refining slag of the present invention is: will have CaO, SiO 2 、Al 2 o 3 , MgO and B 2 o 3 Raw materials of ingredients: active lime, calcium aluminate, wollastonite, dolomite and boric anhydride are crushed → batched → formed into refining slag with a particle size of 15-35mm, and the components in the refining slag are as follows by weight percentage: 55~60%CaO, 10~16%SiO 2 , 15~20%Al 2 o 3 , 4~6%MgO, 5~10%B 2 o 3 , TFe≤1%, the balance is impurities, and the particle size of refining slag is 15-35mm. Those skilled in the art can know, when adopting other have CaO, SiO 2 、Al 2 o 3 , MgO and B 2 o 3 During the raw material of composition, as: limestone, quartz stone, bauxite, light burnt dolomite and boric anhydride, can solve technical problem of the present invention equally, reach technical effec...

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Abstract

The invention discloses fluoride-free refining slag for 20 Cr structural alloy steel and a preparation method thereof. The granularity of the fluoride-free refining slag is 15-35mm, and the fluoride-free refining slag comprises the following components in percentage by weight: 55-60% of CaO, 10-16% of SiO2, 15-20% of Al2O3, 4-6% of MgO, 5-10% of B2O3, less than or equal to 1% of TFe and the balance of impurities. The preparation method of the fluoride-free refining slag comprises that mineral ore raw materials containing CaO, SiO2, Al2O3, MgO and B2O3 are crushed and blended and then moulding and crushing are carried out, so that the fluoride-free refining slag finished product is obtained. The preparation method of the fluoride-free refining slag is simple, and the prepared fluoride-free refining slag has the advantages of environmental friendliness, no fluoride, high slagging speed, strong slag inclusion removal capability, less furnace lining corrosion and strong desulphurization capability.

Description

technical field [0001] The invention relates to a fluorine-free refining slag for 20Cr alloy structural steel and a preparation method thereof, belonging to the technical field of steelmaking. Background technique [0002] 20Cr steel is the most typical basic variety of chromium-based alloy structural steel, and has a huge market demand. It is widely used in the manufacturing industries such as automobiles and mining machinery to manufacture cores that require high strength, wear on the surface, and have a cross-sectional size below 30mm or Carburized parts with complex shapes and low load, such as gears, gear shafts, cams, piston pins, worms, etc.; or parts that require heat treatment with small deformation and high wear resistance, and can be subjected to high-frequency surface quenching after carburizing ; Or quenched and tempered parts with high working speed and medium impact load, which play an important role in my country's national economy and national defense construc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/06C21C7/076
CPCY02P10/242Y02P10/20
Inventor 张帆范植金吴杰徐志周新龙丁礼权徐志东罗国华刘婳
Owner 武钢集团有限公司
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