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Production method of steel for 1300 MPa grade high-strength steel fibers

A technology of high-strength steel and production method, applied in the field of steel production, can solve the problems of unreachable breaking load and high wire breakage rate, and achieve the effects of improving strength and toughness, easy drawing and low cost

Inactive Publication Date: 2015-12-23
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some steel fiber manufacturers use SAE1006 and other series of steels to produce the 1300MPa grade products, but then found that SAE1006 and other series of steels have a high broken wire rate, and the breaking load of the steel fiber products of users cannot meet the requirements of the 1300MPa grade

Method used

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  • Production method of steel for 1300 MPa grade high-strength steel fibers
  • Production method of steel for 1300 MPa grade high-strength steel fibers
  • Production method of steel for 1300 MPa grade high-strength steel fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The production method of the 1300MPa high-strength steel fiber steel adopts the following specific processes.

[0029] (1) The blast furnace molten iron is mixed into the converter for smelting, the weight percentage of the components in the converter tapping molten steel: C0.020%, P0.012%, S0.010%; 6kg / T of medium carbon ferromanganese is added to the ladle when tapping, Add lime 3kg / T later.

[0030] After the LF enters the station, add 2kg / T of lime, and raise the temperature to 1650°C, transport the molten steel to the RH furnace for OB operation, and use full pump vacuum treatment, the minimum vacuum degree is 140pa; after the OB is completed, the decarburization time of molten steel is 8 minutes. After decarburization, adjust the composition, add high-carbon ferromanganese 2.5kg / T for deoxidation alloying, the circulating time of molten steel is more than 11 minutes, and control the oxygen content of off-site to 30ppm.

[0031] (2) Lift the molten s...

Embodiment 2

[0036] Embodiment 2: The production method of the 1300MPa grade high-strength steel fiber steel adopts the following specific process.

[0037](1) The blast furnace molten iron is mixed into the converter for smelting, the weight percentage of the components in the converter tapping molten steel: C0.05%, P0.008%, S0.020%; 6kg / T of medium carbon ferromanganese is added to the ladle when tapping, Add lime 3kg / T later.

[0038] After the LF enters the station, add 2kg / T of lime, and raise the temperature to 1670°C, transport the molten steel to the RH furnace for OB operation, and use full pump vacuum treatment, the minimum vacuum degree is 120pa; after the OB is completed, the decarburization time of molten steel is 9 minutes. After decarburization, adjust the composition, add 3.0kg / T of high-carbon ferromanganese for deoxidation alloying, the circulating time of molten steel is 10 minutes, and control the oxygen content of off-site to 35ppm.

[0039] (2) Lift the molten steel ...

Embodiment 3

[0044] Embodiment 3: The production method of the 1300MPa grade high-strength steel fiber steel adopts the following specific processes.

[0045] (1) The blast furnace molten iron is mixed into the converter for smelting, the weight percentage of the components in the converter tapping molten steel: C0.03%, P0.009%, S0.014%; 6kg / T of medium carbon ferromanganese is added to the ladle when tapping, Add lime 3kg / T later.

[0046] After the LF enters the station, add 2kg / T of lime, and raise the temperature to 1660°C, transport the molten steel to the RH furnace for OB operation, and use full pump vacuum treatment, the minimum vacuum degree is 115pa; after the OB is completed, the decarburization time of molten steel is 9 minutes. After decarburization, the composition is adjusted, and high-carbon ferromanganese 2.8kg / T is added for deoxidation alloying, to ensure that the circulation time of molten steel is more than 12 minutes, and to control the off-site oxygen content to 32pp...

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Abstract

The invention discloses a production method of steel for 1300 MPa grade high-strength steel fibers. The method includes the working procedures of smelting, continuous casting, heating, rolling control and cooling control. In the continuous casting working procedure, molten steel comprises, by mass percentage, 0.02%-0.03% of C, smaller than or equal to 0.03% of Si, 0.35%-0.45% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, and the balance Fe and trace impurities. In the rolling and spinning working procedure, the finish rolling entry temperature ranges from 855 DEG C to 885 DEG C, and the spinning temperature is controlled to range from 890 DEG C to 920 DEG C. Grain refinement and phase change enhancement of raw materials are achieved through existing equipment based on the rolling line adjustment controlled rolling and controlled cooling process, and coil rod products easy to pull, high in strength and reduction of area and good in plasticity and toughness are produced, wherein the content of C in the coil rod products is smaller than or equal to 0.04%, and the requirements of users for steel fibers for construction are met. The produced steel coil rods for the steel fibers can reach the level that the tensile strength ranges from 330 MPa to 370 MPa and the reduction of area is larger than or equal to 75%. The method has the beneficial effects of being low in cost, environment-friendly, simple in process and excellent in product performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, in particular to a production method of 1300MPa grade high-strength fiber steel. Background technique [0002] Steel fibers are mainly used to manufacture steel fiber concrete, and the concrete with steel fibers has greatly improved its compressive strength, tensile strength, flexural strength, impact strength, impact toughness and other properties. Steel fiber products are mainly exported to Europe, America and South Korea, and the specifications of the wire rods used are Φ5.5mm and Φ6.5mm. [0003] Materials for steel fiber (steel for steel fiber) need to have the characteristics of high strength and high area reduction. Some steel fiber manufacturers use SAE1006 and other steel series to produce the 1300MPa grade products, but then found that SAE1006 and other series steel grades have a high broken wire rate, and the breaking load of the user's steel fiber products cannot me...

Claims

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Application Information

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IPC IPC(8): C21D8/06C22C38/04
Inventor 戴永刚王郢田新中李富伟李宝秀宋云霞郭明仪李永超阮士朋李世琳郭玉生
Owner XINGTAI IRON & STEEL