Economical 500MPa-grade steel bar and preparation method thereof

An economical and high-level technology, applied in the field of structural steel metallurgy, can solve problems such as low production efficiency, difficult smelting, and slow rolling speed, and achieve the effects of increased production efficiency, low alloy consumption, and economical comprehensive manufacturing costs

Inactive Publication Date: 2021-01-29
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem to be solved: This application mainly proposes an economical 500MPa grade steel bar and its preparation m

Method used

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  • Economical 500MPa-grade steel bar and preparation method thereof
  • Economical 500MPa-grade steel bar and preparation method thereof
  • Economical 500MPa-grade steel bar and preparation method thereof

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Embodiment

[0022] An economical 500MPa grade steel bar, the economical 500MPa grade steel bar contains components and weight percentages: C0.20~0.25wt%, Mn≤1.60wt%, Si≤0.80%, P≤0.045%, S≤0.045%, Ti≥0.05%, and the rest are iron and unavoidable impurity elements.

[0023] The process route for preparing economical 500MPa-grade steel bars is as follows: blast furnace molten iron is smelted by top-bottom double-blowing converter, electric furnace smelt, converter and electric furnace are tapped and alloyed, molten steel is blown at the bottom and the composition is uniform, and then the steel billet is continuously cast into billets; After heating, rolling, water cooling, and cooling bed cooling, they are cut into fixed-length smooth round steel bars or ribbed steel bars, and are stacked and shipped after inspection and bundling.

[0024]After adding steel scrap into the converter, it is mixed into molten iron in the blast furnace. The steel scrap ratio is 15-25%. Slag is added during the pr...

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Abstract

The invention discloses an economical 500MPa-grade steel bar and a preparation method thereof. The economical 500MPa-grade steel bar comprises 0.20-0.25 wt% of C, less than or equal to 1.60 wt% of Mn,less than or equal to 0.80% of Si, less than or equal to 0.045% of P, less than or equal to 0.045% of S, more than or equal to 0.05% of Ti and the balance iron and inevitable impurity elements. The key Si content of the preparation method is achieved by silicomanganese and ferrosilicon alloy, and ferrotitanium is added in the tapping process; and compared with an existing 500 MPa-grade traditional vanadium and niobium hot rolling process, the alloy consumption is low, no precious metal element is contained, economical efficiency is achieved, and the cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of structural steel metallurgy, and in particular relates to an economical 500MPa grade steel bar and a preparation method thereof. Background technique [0002] According to statistics, in 2019, China's steel production and sales volume was 1.205 billion tons, and steel bar production and sales volume was 250 million tons, accounting for about 20.74%. The 500MPa level accounted for more than 80% of steel bar products; since the implementation of the new national standard GB / T1499.2, more than 85 More than 100% of enterprises produce HRB500 by adding more than 0.025% of vanadium, using vanadium to form carbonitrides in steel, which can play the role of precipitation strengthening and precipitation strengthening, thereby further improving the strength of steel bars. The rest adopts Nb and Ti microalloying. Compared with Ti microalloying, vanadium microalloying process has a stable and controlled yield. Compar...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C33/06C21C5/35C21D8/08
CPCC22C38/02C22C38/04C22C38/14C22C33/06C21C5/35C21D8/08
Inventor 朱海涛聂文金金玉静桂海峰龚琰张康徐天明黄斌
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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