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Method for producing low carbon bainite high-strength steel based on sheet bar continuous casting and rolling process flow

A technology of thin slab continuous casting and low carbon bainite, which is applied in the direction of metal rolling and process efficiency improvement to achieve the effects of low production cost, good welding performance and high formability

Active Publication Date: 2008-09-03
湖南华菱涟源钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The new composition design and process of low carbon bainite steel plate with yield strength of 600MPa based on continuous casting and rolling of thin plate using Ti and Nb microalloying has not been reported at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment one, smelting with converter:

[0039] Pour out the residue after slag splashing to protect the furnace, mix the blast furnace molten iron into the top-bottom composite blowing converter with a nominal capacity of 100t, add 10% scrap steel, and blow oxygen from the top. Add lime, lightly burned dolomite, sintered ore, and fluorite into the furnace, blow argon at the bottom of the converter throughout the process, and the intensity of argon blowing is 0.04Nm 3 / min · 吨钢 , end-point sampling analysis; when the composition of molten steel [C]≤0.04%, [P]吨钢 . 30 seconds before tapping, the red ladle is blown with argon, and the red ladle is tapped. The tapping time is 3 minutes. During the tapping process, add lime 4.4kg / 吨钢 , pre-melted slag 2.0kg / 吨钢 , slagging agent 1.40kg / 吨钢 , starting from 1 / 3 of the molten steel in the converter, add ferromolybdenum alloy 4.0kg / 吨钢 , metal manganese 16.5kg / 吨钢 , chromium ferroalloy 8.5kg / 吨钢 , ferrosilicon alloy 3.0k...

Embodiment 2

[0041] Embodiment two, smelting with converter:

[0042] Pour out the residue after slag splashing to protect the furnace, mix the blast furnace molten iron into the top-bottom composite blowing converter furnace with a nominal capacity of 100t, add 5% scrap steel, and blow oxygen from the top. Add lime, lightly burned dolomite, sintered ore, and fluorite into the furnace, and blow argon to the bottom of the converter throughout the whole process, and the intensity of argon blowing is controlled at 0.02Nm 3 / min · 吨钢 , Sampling temperature measurement at the end point, when the liquid steel composition [C] ≤ 0.04%, [P] 吨钢 ; 30 seconds before tapping the red ladle, start to blow argon to the red ladle; tap the red ladle, the tapping time is 3.5min, add lime 4.2kg / 吨钢 , pre-melted slag 2.1kg / 吨钢 , slagging agent 1.6kg / 吨钢 1.8 kg / 吨钢 , metal manganese 16.0kg / 吨钢 , ferrochrome 10.0kg / 吨钢 , ferrosilicon alloy 2.5kg / 吨钢 And aluminum block 1.7kg / 吨钢 , when 3 / 4 of the molten s...

Embodiment 3

[0044] Embodiment three, smelting with converter:

[0045] Pour out the residue after slag splashing to protect the furnace, mix the blast furnace molten iron into the top-bottom compound blowing converter furnace with a nominal capacity of 100t, add 5% pig iron, and top-blown oxygen. Add lime, lightly burned dolomite, sintered ore, and fluorite into the furnace, and blow argon to the bottom of the converter throughout the whole process, and the intensity of argon blowing is controlled at 0.05Nm 3 / min · 吨钢 , Sampling and temperature measurement at the end point, when the molten steel composition [C] ≤ 0.04%, [P] 吨钢 ; 30 seconds before tapping the red ladle, begin to blow argon to the red ladle; tap the red ladle, the tapping time is 3min, add lime 4.0kg / 吨钢 , pre-melted slag 1.95kg / 吨钢 , slagging agent 1.5kg / 吨钢 , starting from 1 / 3 of the molten steel in the converter, add manganese 16.3kg / to the ladle molten steel in sequence 吨钢 , ferrochrome 9.0kg / 吨钢 , ferrosilicon a...

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Abstract

The invention discloses a method for producing high-strength low-carbon bainite steel based on thin slab continuous casting and rolling process. The method includes the following steps: melting by using a rotary furnace or an electric furnace, refining molten steel in an LF furnace after the component analysis, performing the composition adjustment, continuously casting thin slabs, directly heating the thin slabs at the temperature of 950-1100 DEG C in a roller-hearth heating (soaking) furnace at a temperature not less than 1150 DEG C, controlling the tapping temperature of heated thin slabs in a range from 1050 DEG C to1160 DEG C, rolling by using a continuous rolling mill to produce plates, finishing at a temperature of 840-860 DEG C, performing laminar cooling, and coiling with a down coiler at a temperature of 550-600 DEG C to produce the steel coil. The method can produce non-tempered high-strength steel based on thin slab continuous casting and rolling process, and has the advantages of simple metallurgical composition of steel, low cost of alloying production, and stability in high toughness and good forming and welding properties of the steel coil.

Description

technical field [0001] The invention relates to a thin slab continuous casting and rolling process for production of large-scale electric shovels, bulldozers, dump trucks, oil and gas pipelines, drilling rigs and fully mechanized coal mining machinery, automobile crane booms, turntables, extended (heavy) container main spines, A method for low-carbon bainitic high-strength steel with a yield strength of 600 MPa on various construction machinery such as heavy-duty vehicle structures. Background technique [0002] Low-carbon bainitic steel is a new class of high-strength, high-toughness, and multi-purpose steel. Therefore, the adverse effect of carbon on the toughness of bainite structure is completely eliminated, and a very fine bainite matrix structure with high dislocation density can be obtained after controlled rolling and controlled cooling. The strength of this type of steel no longer depends on the carbon content in the steel, but is mainly guaranteed by means of fine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D1/00B21B1/46C21C7/076C22C38/00
CPCY02P10/20
Inventor 焦国华康永林温德智刘国民周明伟吴光亮朱正谊周峰陈建新胡大朱建学肖惠平邓中秋陈林恒黎先洁
Owner 湖南华菱涟源钢铁有限公司
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