Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof

A technology of ultra-fine grain and disk, applied in the field of ferrous metallurgy, can solve the problems of high and low temperature performance, no description of aging performance, low Mn content, high process cost, etc., to improve passivation corrosion resistance, reduce alloying cost, good toughness effect

Active Publication Date: 2014-08-13
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are reports on the research and development of HPB300 hot-rolled light round wire rod steel bars, it is well known that the Mn content in steel is low, and the strength will decrease. Therefore, the currently disclosed HPB300 hot-rolled light round wire rod steel bars have high process costs due to high Mn content. The mechanical properties of the steel only meet the requirements of GB 1499.1-2008, the microstructure is ferrite + pearlite, and the grain size is less than 12 grades; in addition, there is no description of the high and low temperature performance and aging performance of the steel

Method used

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  • Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof
  • Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof
  • Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof

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preparation example Construction

[0020] as attached figure 1 As shown, the preparation method of the ultrafine-grained HPB300 hot-rolled round wire rod steel bar of the present invention includes molten steel smelting, molten steel casting, billet controlled rolling and controlled cooling process, specifically comprising:

[0021] A. Molten steel smelting: Add molten iron, scrap steel and pig iron into the LD oxygen converter, conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount for slagging, control the end carbon ≥ 0.08wt%, and tap The temperature is less than 1640 ℃; before tapping, add active lime to the bottom of the ladle; when tapping, argon is blown at the bottom of the ladle. Ferromanganese, ferrosilicon, ferroboron and high-carbon ferrochrome are added to the molten steel in the ladle when the amount of molten steel reaches 3 / 4; after tapping, blow argon to the molten steel for 4 to 5 minutes; Conventional large bag covering agent;

...

Embodiment 1

[0040] A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount to make slag; control the end point carbon to 0.08wt%, and tap the steel The temperature is 1638°C, and the rate is 2.5kg / t before tapping 钢 The amount of active lime is added to the bottom of the ladle; when the steel is tapped, the argon is blown at the bottom of the ladle, the flow rate of the argon gas is controlled at 30NL / min, and the argon blowing time is 5 minutes. Add the following substances: according to 0.8kg / t 钢 The amount of aluminum and iron in the following mass ratio is added: Al 53.5wt%, the rest is Fe and unavoidable impurities; according to 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium alloy: Si 52.5wt%, Ca 11.5wt%, Ba 12.5wt%, Al 3.5wt%, the rest is Fe and unavoidable impurities; according to 1.5kg / ...

Embodiment 2

[0053]A. Molten steel smelting: After adding molten iron, scrap steel and pig iron into the LD oxygen converter, carry out conventional top-bottom compound blowing, add lime, dolomite and magnesite balls according to the conventional amount for slagging; control the end point carbon to 0.09wt%, and produce The steel temperature is 1636°C, 2.5kg / t before tapping 钢 The amount of active lime is added to the bottom of the ladle; when the steel is tapped, the argon is blown at the bottom of the ladle, the flow rate of the argon gas is controlled at 40NL / min, and the argon blowing time is 4 minutes. Add the following substances: according to 1.0kg / t 钢 The amount of aluminum and iron in the following mass ratio is added: Al 53.5wt%, the rest is Fe and unavoidable impurities; according to 1.0kg / t 钢 Add the following mass ratio of silicon-calcium-barium alloy: Si 52.5wt%, Ca 11.5wt%, Ba 12.5wt%, Al 3.5wt%, the rest is Fe and unavoidable impurities; according to 2.8kg / t 钢 The amount o...

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Abstract

The invention discloses an ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and a preparation method thereof. The ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar comprises the following components in percentage by weight: 0.15-0.18% of C, 0.10-0.16% of Si, 0.16-0.28% of Mn, 0.080-0.120% of Cr, 0.0010-0.0020% of B, less than 0.030% of S, less than 0.045% of P and the balance of Fe. The reinforcing steel bar is prepared from molten iron, steel scrap and pig iron through steps of molten steel smelting, molten steel pouring and billet controlled rolling and controlled cooling. According to the reinforcing steel bar, a small amount of ferromanganese, ferroboron and high carbon ferro-chrome alloy into the steel-making step, so that the alloying cost is remarkably lowered. By adopting low-temperature controlled rolling before spinning and a stelmor roller aerial fog cooling process after spinning, the reinforcing steel bar has the advantages of low cost, good toughness, excellent high- and low-temperature performance, low stress time-validity and the like.

Description

technical field [0001] The invention belongs to the technical field of ferrous metallurgy, and specifically relates to an ultra-fine-grained HPB300 hot-rolled smooth round wire rod steel bar with low cost, good strength and toughness, excellent high and low temperature performance, and low strain aging performance and a manufacturing method thereof. 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 for concrete construction projects. In recent years, with the rapid development of the national economy and the construction industry, the output of hot-rolled smooth round steel bars has increased significantly, and hot-rolled smooth round steel bars account for 15% of the total steel output. [0003] HPB300 hot-rolled smooth round wire rod steel bar has the advantages of high strength, good comprehensive performance, and steel savi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D8/08
Inventor 陈伟张卫强赵宇王卫东李金柱邓家木文玉兵吴光耀万春梅
Owner WUKUN STEEL
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