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

A low-carbon bainite and thin slab continuous casting technology, which is applied in the direction of metal rolling and process efficiency improvement

Active Publication Date: 2010-12-08
湖南华菱涟源钢铁有限公司 +1
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014]Based on continuous casting and rolling of thin plates, the new composition design and process of producing low-carbon bainite steel plates with a yield strength of 600MPa by Ti and Nb microalloying are well known at home and abroad Not yet reported

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment one, smelting with converter:

[0040] 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 liquid steel composition [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 3.0kg / ...

Embodiment 2

[0042] Embodiment two, smelting with converter:

[0043] 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

[0045] Embodiment three, smelting with converter:

[0046] 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, start 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 alloy 3.5kg / 吨钢 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to view more

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 present invention involves a type of production based on the plate -based blanking processing process for large -scale electric shovels, bulldozers, dump trucks, oil and gas pipelines, drilling machines and coal comprehensive mining machinery, car crane boom, transfers, extended (aggravated) main backbone of the container.The method of yield intensity in various types of engineering machinery such as heavy vehicle structures is 600MPA -level low -carbon bellian high -strength steel. Background technique [0002] Low -carbon bodies steel is a type of high -strength, high toughness, multi -purpose new steel type. Its emergence is the inevitable result of the development of social needs and modern metallurgy technology in the past 30 years. Because the carbon content in this type of steel has been significantlyDecreased, thereby completely eliminating the adverse effects of carbon on the toughness of the belli tissue. After the cold control, it can obtain ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap