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Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof

A construction, straight strip technology, applied in the field of metal material processing and forming, can solve the problem that there is no HPB300 hot-rolled straight strip steel bar, etc., achieve good plasticity and toughness, promote improvement, and increase the effect of recrystallization temperature

Active Publication Date: 2014-04-02
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many technical solutions involving hot-rolled steel bars in the Chinese patent database, but there is no application for technical solutions involving HPB300 hot-rolled straight steel bars

Method used

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  • Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof
  • Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof
  • Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into a 50-ton LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite, and magnesite balls according to conventional amounts for slagging, and control the carbon content at the end point to 0.07 wt%, when the tapping temperature is less than 1667 ℃, 1.0kg / t before tapping 钢 Add lime to the bottom of the ladle; blow argon at the bottom of the whole process when tapping, and control the flow of argon to 30NL / min. When the molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium composite deoxidizer: Si 26.5wt%, Ca 12.5wt%, Ba 9.5wt%; according to 1.4kg / t 钢 The amount of adding C content of 7.5wt%, Cr content of 58.5wt% high-carbon ferrochrome; according to 6.4kg / t 钢 The amount of adding Mn content is 66.5wt%, Si content is 17.5wt% silicon-manganese alloy; ...

Embodiment 2

[0032] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into a 50-ton LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite, and magnesite balls according to conventional amounts for slagging, and control the carbon content of the end point to 0.06 wt%, when the tapping temperature is less than 1667 ℃, 1.0kg / t before tapping 钢Add lime to the bottom of the ladle; blow argon at the bottom of the whole process when tapping, and control the flow rate of argon to 40NL / min. When the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium composite deoxidizer: Si 26.5wt%, Ca 12.5wt%, Ba 9.5wt%; according to 2.6kg / t 钢 The amount of adding C content of 7.5wt%, Cr content of 58.5wt% high-carbon ferrochrome; according to 8.4kg / t 钢 The amount of adding Mn content is 66.5wt%, Si content is 17.5wt% silicon-man...

Embodiment 3

[0042] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into a 50-ton LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite, and magnesite balls according to conventional amounts for slagging, and control the carbon content of the end point to 0.06 wt%, when the tapping temperature is less than 1665 ℃, 1.0kg / t before tapping 钢 Add lime to the bottom of the ladle; blow argon at the bottom of the whole process when tapping, and control the flow rate of argon to 50NL / min. When the amount of molten steel in the ladle is greater than 1 / 4, add the following substances to the ladle in turn: 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium composite deoxidizer: Si 26.5wt%, Ca 12.5wt%, Ba 9.5wt%; according to 3.1kg / t 钢 The amount of adding C content is 7.5wt%, Cr content is 58.5wt% of high-carbon ferrochromium; according to 10.2kg / t 钢 The amount of adding Mn content is 66.5wt%, Si content is 17.5wt% sili...

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Abstract

The invention provides a construction-use HPB300 hot-rolled straight steel bar and a preparation method thereof. According to the invention, through molten steel smelting, molten steel casting, and billet rolling, the construction-use HPB300 hot-rolled straight steel bar is obtained. The steel bar comprises the chemical components of, by mass: 0.15-0.22% of C, 0.20-0.40% of Si, 0.45-0.70% of Mn, 0.10-0.20% of Cr, no more than 0.045% of S, no more than 0.045% of P, and balance of Fe and unavoidable impurities. The steel bar provided by the invention has the advantages of high strength, good ductility and toughness, excellent shock resistance, and the like. Under a temperature of 600 DEG C, the high-temperature yield strength ReL of the steel bar is more than 0.40 times that under a room temperature, which is substantially higher than a common steel material. The steel bar also has good high-temperature fire resistance.

Description

technical field [0001] The invention relates to a HPB300 hot-rolled straight steel bar for construction and its preparation, belonging to the technical field of metal material processing and forming. Background technique [0002] Hot-rolled round steel bars for concrete are one of the most widely used steel materials in the construction industry, and are mainly used as stirrups and reinforcements in concrete construction projects. In recent years, with the rapid development of my country's national economy and construction industry, the output of hot-rolled steel bars has increased significantly. In 2011, the output of hot-rolled smooth round steel bars reached 120 million tons, accounting for 18% of steel output. Most of the hot-rolled steel bars are HPB235 smooth round steel bars with low strength grades and serious resource and energy consumption. In order to speed up the upgrading of steel used in construction in my country and better promote the construction of a two-or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C22C38/18C22C38/60
Inventor 张卫强陈伟赵宇王卫东李金柱庾郁梅吴光耀
Owner WUKUN STEEL