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Nb+Cr component system sleeve hot-rolled steel strip and preparation process thereof

A preparation process and casing technology, which is applied in the field of Nb+Cr composition hot-rolled steel strip for casing and its preparation technology, can solve problems such as the inability of products to meet demand, achieve improved quality advantages, ensure comprehensive performance, and broad application prospects Effect

Inactive Publication Date: 2019-04-05
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] So far, the development of J55 casing is at a relatively mature stage, and the Nb+Ti composition system is basically used for production. Although the comprehensive performance of the product is relatively stable, the products of this composition system cannot meet the needs of foreign markets.

Method used

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  • Nb+Cr component system sleeve hot-rolled steel strip and preparation process thereof
  • Nb+Cr component system sleeve hot-rolled steel strip and preparation process thereof
  • Nb+Cr component system sleeve hot-rolled steel strip and preparation process thereof

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Embodiment 1

[0023] Converter: Tapping temperature ≥ 1620°C, to ensure that the composition and temperature are coordinated and tapped; if the tapping temperature of the new tapping hole is based on the upper temperature limit, the tapping temperature should be increased by 10-15°C as appropriate. Add ferro-aluminum, ferrosilicon, ferromanganese, etc. for deoxidation alloying, and add ferrochrome to adjust the composition.

[0024] Refining: LF furnace slagging and desulfurization, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, and ferroniobium to adjust to the target composition range. Calcium treatment is performed after LF treatment, and the soft blowing time is guaranteed to be more than 8 minutes after calcium treatment.

[0025] Continuous casting: The liquidus temperature of this steel is 1514°C, the superheat of molten steel in the first tundish is 25-40°C, and the superheat of molten steel in other heats is 15-30°C.

[0026] Controlled rolling and controll...

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Abstract

The invention discloses a Nb+Cr sleeve hot-rolled steel strip, and further discloses a preparation process of the Nb+Cr sleeve hot-rolled steel strip. The Nb+Cr sleeve hot-rolled steel strip is prepared from the chemical compositions in percentage by mass: 0.15-0.18% of C, 0.10-0.25% of Si, 1.05-1.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, 0.020-0.030% of Nb,0.020-0.050% of Alt, 0.0010-0.0030% of Ca and the balance of Fe and other inevitable elements. According to the preparation process that a J55 hot-rolled steel strip is developed by adopting a Nb+Cr component system, a certain amount of Cr is added to be reasonably matched with Nb, based on the advantage of a current 2250mm hot-rolling production line, a perfect production process route is formulated to ensure the comprehensive performance of the hot-rolled steel strip, and a broad application prospect is achieved.

Description

technical field [0001] The invention relates to the field of iron and steel products, in particular to a casing hot-rolled steel strip with Nb+Cr composition system and a preparation process thereof. Background technique [0002] So far, the development of J55 casing is at a relatively mature stage, and the Nb+Ti composition system is basically used for production. Although the comprehensive performance of the product is relatively stable, the products of this composition system cannot meet the needs of foreign markets. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a Nb+Cr composition system casing hot-rolled steel strip and its preparation process. The Nb+Cr composition system not only meets the mechanical properties of the product, but also fills up the foreign demand for J55. The demand for rolled steel strips can initially meet the various properties of hot-rolled steel str...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/26
Inventor 武利平刘妍宿成
Owner BAOTOU IRON & STEEL GRP
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