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Easy-to-draw tire cord steel coil rod and production method

A production method and technology for steel wire rods, which are applied in the field of cord steel production, can solve the problem that cord steel cannot be well adapted to high-speed drawing, etc., and achieve the effects of improving drawing speed, improving cleanliness, and excellent drawing performance.

Active Publication Date: 2020-02-04
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

The cord steel produced by the prior art cannot well meet the requirements of high-speed drawing

Method used

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  • Easy-to-draw tire cord steel coil rod and production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment provides a kind of easy-drawn cord steel LX72A wire rod, LX72A wire rod network cementite grade 0, sorbite rate of 98%, proeutectoid ferrite of 0.1%, strength fluctuation range of 12MPa; the defect depth on the surface of the wire rod is 0.02mm, and the defect ratio is 0.1%. The production method of easy-drawn cord steel LX72A wire rod. Including hot metal KR desulfurization, converter steelmaking, LF refining, bloom continuous casting, blooming, grinding, rolling. Specific steps are as follows:

[0019] Hot metal KR desulfurization process:

[0020] Hot metal before desulfurization: temperature is 1360°C, S content is 0.04%, Ti content is 0.08%; hot metal after desulfurization: temperature is 1310°C, S content is 0.004%, Ti content is 0.09%.

[0021] Converter smelting process:

[0022] The molten iron ratio is 90%; the S content of steel scrap is 0.020%, the Ti content is 0.008%, and the Al content is 0.025%. When adding alloy material and slag ma...

Embodiment 2

[0032] This embodiment provides an easy-draw cord steel LX82A wire rod, the wire rod network cementite is 0.5 grade, the sorbite rate is 99%, the proeutectoid ferrite is 0.1%, and the strength fluctuation range is 13MPa ; The surface defect depth of the wire rod is 0.03mm, and the defect ratio is 0.3%.

[0033] The production method of easy-drawn cord steel LX82A wire rod. Including hot metal KR desulfurization, converter steelmaking, LF refining, bloom continuous casting, blooming, grinding, rolling. Specific steps are as follows:

[0034] Hot metal KR desulfurization process:

[0035] Hot metal before desulfurization: temperature is 1365°C, S content is 0.035%, Ti content is 0.06%; hot metal after desulfurization: temperature is 1311°C, S content is 0.003%, Ti content is 0.07%.

[0036] Converter smelting process:

[0037] The molten iron ratio is 91%; the S content of scrap steel is 0.015%, the Ti content is 0.01%, and the Al content is 0.020%; the final slag basicity o...

Embodiment 3

[0047] This embodiment provides an easy-draw cord steel LX86A wire rod, the wire rod network cementite is 1.0, the sorbite rate is 99%, the proeutectoid ferrite is 0.1%, and the strength fluctuation range is 15MPa ; The surface defect depth of the wire rod is 0.02mm, and the defect ratio is 0.4%. The rough drawing speed is 8m / s, the intermediate drawing speed is 18m / s, the wet drawing speed is 18m / s, and the broken wire rate is 1 time / 100t.

[0048] The production method of easy-drawn cord steel LX86A wire rod. Including hot metal KR desulfurization, converter steelmaking, LF refining, bloom continuous casting, blooming, grinding, rolling. Specific steps are as follows:

[0049] Hot metal KR desulfurization process:

[0050] Hot metal before desulfurization: temperature is 1360°C, S content is 0.04%, Ti content is 0.07%; hot metal after desulfurization: temperature is 1308°C, S content is 0.004%, Ti content is 0.06%.

[0051] Converter smelting process:

[0052] The molte...

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Abstract

The invention discloses an easy-to-draw tire cord steel coil rod and a production method. According to the tire cord steel coil rod and the method, rough drawing speed of the tire cord steel coil rodis 8-10 m / s, intermediate drawing speed is 18-22 m / s, wet drawing speed is 18-20 m / s, the wire breakage rate is less than or equal to 1 time / 100 t, the quality of molten iron entering a furnace and the quality of scrap steel are strictly controlled, the superheat degree of the molten steel, the continuous casting cooling strength, the heavy-pressure downward pressing amount, the grinding process and the high-speed wire rod rolling cooling system are set to be reasonable, the coil rod network cementite is less than or equal to 1.0 grade, the sorbitizing rate is greater than or equal to 95%, theproeutectoid ferrite is less than 0.5%, the intensity fluctuation range is less than or equal to 15 MPa, the surface defect depth is less than or equal to 0.05 mm, and the defect ratio is less than or equal to 0.8%.

Description

technical field [0001] The application belongs to the technical field of cord steel production, and in particular relates to an easy-drawn cord steel wire rod and a production method. Background technique [0002] High-speed drawing, while ensuring a low wire breakage rate, can significantly improve production efficiency and reduce processing costs, so it is a technological development trend in the field of wire processing. [0003] High-speed drawing puts forward higher requirements on the quality level of wire rod. For example, high-speed drawing has very high requirements on the continuity and uniformity of the structure of the wire rod. During the high-speed drawing process, the force on the wire rod is not uniform, and it is very easy to generate stress concentration in the weak link, and then cause diameter shrinkage and broken wires. ; Tiny defects will not affect stress transmission at low strain rates, but when high-speed drawing occurs, tiny defects will hinder st...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/06C22C38/14C21D8/06C21D9/52B21B37/74
CPCC22C33/06C21D8/065C21D9/525C22C38/002C22C38/14C22C38/06B21B37/74C21D2211/005C21D2211/009Y02P10/20
Inventor 麻晗于学森沈奎
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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