Wire rod used for ultrahigh-strength steel cord and manufacture method of wire rod

An ultra-high-strength, manufacturing method technology, applied in the direction of manufacturing tools, temperature control, metal rolling, etc., can solve the problems of high wire breaking rate in drawing, high wire breaking rate in twisted strands, and low yield rate, etc., and achieve the goal of drawing Low energy consumption, low wire breakage rate, and easy drawing operation

Active Publication Date: 2019-12-31
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these high-strength wire rods have problems such as high wire breakage rate during drawing, high strand breakage rate, high die consumption, and low yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (1) Steelmaking stage

[0078] After desulfurization of molten iron, primary smelting in the furnace, refining outside the furnace and removal of inclusions in sequence, the number density of inclusions with a size ≥ 5 μm is 0.5 pieces / mm 2 , Liquid steel with inclusion size ≤ 30μm. The specific process is as follows:

[0079] Desulfurization process of molten iron: put the blast furnace molten iron with temperature T=1374°C, Si=0.38%, S=0.035%, and weight 111t into the KR desulfurization device for desulfurization, after desulfurization, S=0.001% in the molten iron;

[0080] Primary smelting process in the furnace: First, put the molten iron after the desulfurization process and 18t of clean steel scrap into a 120t converter for dephosphorization and decarburization, specifically oxygen blowing desiliconization and dephosphorization in the converter, adding lime , Lightly burned dolomite, pellets, etc., control the basicity of slag to 2.0, control the temperature bel...

Embodiment 2

[0100] (1) Steelmaking stage

[0101] After desulfurization of molten iron, primary smelting in the furnace, refining outside the furnace and removal of inclusions in sequence, the number density of inclusions with a size ≥ 5 μm is 0.45 pieces / mm 2 , Liquid steel with inclusion size ≤ 28μm. The specific process is as follows:

[0102] Desulfurization process of molten iron: Put the blast furnace molten iron with temperature T=1362°C, Si=0.40%, S=0.032%, and weight 109t into the KR desulfurization device for desulfurization, after desulfurization, S=0.001% in the molten iron;

[0103]Primary smelting process in the furnace: firstly, the molten iron after the desulfurization process of the molten iron and the clean steel scrap weighing 19t are put into a 120t converter for dephosphorization and decarburization. , Lightly burned dolomite, pellets, etc., control the basicity of slag to 2.1, control the temperature below 1420 ° C, blowing to obtain P = 0.035%, Si = 0.0008% of sem...

Embodiment 3

[0123] (1) Steelmaking stage

[0124] After desulfurization of molten iron, primary smelting in the furnace, refining outside the furnace and removal of inclusions in sequence, the number density of inclusions with a size ≥ 5 μm is 0.38 pieces / mm 2 , Liquid steel with inclusion size ≤ 24μm. The specific process is as follows:

[0125] Hot metal desulfurization process: put the blast furnace hot metal with a temperature T=1369°C, Si=0.38%, S=0.036%, and a weight of 109t into the KR desulfurization device for desulfurization. After desulfurization, the hot metal S=0.001%;

[0126] Primary smelting process in the furnace: firstly, the molten iron after the desulfurization process of the molten iron and the clean steel scrap weighing 19t are put into a 120t converter for dephosphorization and decarburization. , Light-burned dolomite, pellets, etc., control the slag basicity to 1.9, control the temperature below 1420°C, blowing to obtain P=0.033%, Si=0.001% of semi-steel molten i...

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Abstract

The invention discloses a wire rod used for an ultrahigh-strength steel cord and a manufacture method of the wire rod. The manufacture method includes the steel smelting stage, the blank casting stage, the cogging stage, the rolling stage and the controlled cooling stage which are sequentially conducted. In the steel smelting stage, molten steel is smelted, wherein the number density of inclusionswith the size being larger than or equal to 5 micrometers is smaller than or equal to 0.5 / mm<2>, and the inclusion size is smaller than or equal to 30 micrometers. In the blank casting stage, tappingmolten steel of the steel smelting stage is cast into an ingot blank with the central carbon segregation being 0.92 to 1.08. In the cogging stage, the ingot blank is made into an intermediate billetwith the central carbon segregation being 0.95 to 1.05 through cogging. In the rolling stage, the intermediate billet is rolled into the wire rod. In the controlled cooling stage, temperature-controlled cooling is conducted on the wire rod, and the wire rod which is high in cleanliness and high in homogeneity and has the tensile strength being smaller than or equal to 1150 MPa is obtained. The wire rod can be used for the ultrahigh-strength steel cord with the monofilament tensile strength being larger than or equal to 3600 MPa, the low drawing wire breaking rate, the low stranding wire breaking rate and the low mold consumption can be ensured, and the high yield is ensured.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a wire rod for producing ultra-high-strength steel cords and a manufacturing method thereof. Background technique [0002] In recent years, domestic automobiles have developed extremely rapidly, and my country's automobile production and sales have already ranked first in the world. Practice has proved that the overall mass of the car is reduced by half, and the corresponding fuel consumption of the car will also be reduced by nearly half. Due to the needs of environmental protection and energy saving, the lightweight of automobiles has become the trend of automobile development in the contemporary world. [0003] Steel cord is the main skeleton material of car tire meridian, and every time the strength of steel cord is increased by one level, the weight of car tires can be reduced by 10%. Therefore, with the development of automobiles in the direction of lightwei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C33/04C21C7/064C21C7/068C21C7/10C21D8/06B21B1/46B21B45/00B21B37/74B21B37/48B21B37/00
CPCC22C38/60C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C38/008C22C38/002C22C38/001C22C33/04C21C7/064C21C7/068C21C7/10C21D8/065B21B1/463B21B45/004B21B37/74B21B37/48B21B37/00B21B2265/12C21C7/06C21C7/072C21C7/076C21D9/52Y02P10/20C21D11/005B32B15/013B21B1/18B22D11/115C21D6/004C21D6/005C21D6/008C21D9/525
Inventor 邹长东麻晗赵家七沈奎蔡小锋施一新黄永林
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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