Method for controlling high-carbon steel inclusions

A control method and technology for inclusions, applied in the field of metallurgy, can solve problems such as difficulty in entering the plastic composition area of ​​inclusions, and achieve the effects of improving comprehensive mechanical properties, refining dimensions, and flexible production processes

Inactive Publication Date: 2019-02-12
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for steels that must be deoxidized by Al, the Al content of inclusions in the steel 2 o 3 High content, it is difficult to enter the plastic component area of ​​inclusions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After the LF refining task is over, feed 60m / furnace of magnesium-containing cored wire into the ladle, and use a flow rate of 20m during the feeding process 3 Argon blowing and stirring at the bottom of argon gas per hour. The cored wire contains 15% magnesium, 10% aluminum, and 75% iron powder. It is wrapped in a 1.5mm seamless pure iron pipe. 3 / h of argon for bottom blowing argon and weak stirring for 15 minutes, then sent to the continuous casting process, the cross-section of the billet is 175mm×175mm, and the rolled wire is φ5.5mm wire rod. The tensile strength of the wire rod is increased by 90MPa after user inspection. , The section elongation rate increased by 9%, and the broken wire rate decreased by more than 60%. The size of the inclusions in the wire rod is concentrated between 1.5 μm and 2.5 μm, and the largest inclusion diameter is less than 5 μm.

Embodiment 2

[0019] After the LF refining task is over, feed 60m / furnace of magnesium-containing cored wire into the ladle, and use a flow rate of 15m during the feeding process 3 Argon blowing and stirring at the bottom of argon gas per hour. The cored wire contains 15% magnesium, 10% aluminum, and 75% iron powder. It is wrapped in a 1.5mm seamless pure iron pipe. 3 / h of argon for bottom blowing and argon weak stirring for 20min, then sent to the continuous casting process, the billet section is 175mm×175mm, the rolled wire rod is φ5.5mm wire rod, and the tensile strength of the wire rod is increased by 91MPa after user inspection , The section elongation rate increased by 9%, the broken wire rate decreased by 60%, the size of the inclusions in the wire rod was concentrated between 1.5 μm and 2.5 μm, and the largest inclusion diameter was less than 5 μm.

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Abstract

The invention belongs to the technical field of metallurgy, and relates to a method for controlling high-carbon steel inclusions. According to the method, in the case of a magnesium treatment station,a magnesium-containing cored wire is fed into molten steel after LF refining is finished, magnesium elements are relied to react with elements in the molten steel in a steam form after the magnesiumelements enter the molten steel, a large amount of nano-scale magnesium oxide or magnesium-aluminum spinel particles distributed in a dispersed manner are formed, and a heterogeneous nuclear particleis provided for follow-up inclusion nucleation and microstructure refinement; by adopting the control method, on one hand, the sizes of the non-metal inclusions in the high-carbon steel can be significantly refined, the control range of the aluminum oxide inclusions in the high-carbon steel is widened, and the production process is more flexible; and on the other hand, magnesium treatment can alsoinhibit precipitation of reticulate carbides in the high-carbon steel, so that the carbide are made to be changed into spherical particles, and the comprehensive mechanical property of a high-carbonsteel wire rod can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for controlling inclusions in high-carbon steel. Background technique [0002] High-carbon steel is a steel type with a carbon content of C≥0.6%. It is widely used in the metal products industry, especially in the wire industry. Steel cords, cut-off wires, rubber hose wires, bead wires, and oil drilling Steel wire rope, etc., with a minimum diameter of 0.08mm, have very high requirements on the purity of steel, strict control on the removal of impurity elements, and very high requirements on the control of non-metallic inclusions in steel. [0003] Cord steel is a typical high-carbon steel wire product. In the production process, the wire rod with a diameter of 5.5mm needs to be drawn into a 0.15mm filament. Rope. When such a thin wire is drawn, any hard inclusions, segregation, unconventional structure, internal and surface defects of a slightly larger size may be fat...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/072
CPCC21C7/0056C21C7/072C21C7/076Y02P10/20
Inventor 秦俊山付红卫胡明
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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