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Annealing process of hot-rolled steel plate produced by thin slab continuous casting and rolling process

A technology for continuous casting of thin slabs and hot-rolled steel sheets, which is applied in the field of hot-rolled steel sheets and can solve problems such as no application.

Inactive Publication Date: 2016-08-24
TANGSHAN BOHAI STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bell annealing is widely used in the cold rolling industry, but there is no precedent for softening annealing of hot-rolled sheets, especially thin slab continuous casting and rolling hot-rolled steel sheets.

Method used

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  • Annealing process of hot-rolled steel plate produced by thin slab continuous casting and rolling process
  • Annealing process of hot-rolled steel plate produced by thin slab continuous casting and rolling process
  • Annealing process of hot-rolled steel plate produced by thin slab continuous casting and rolling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The annealing process of the hot-rolled steel plate produced by the thin slab continuous casting and rolling process, the raw material adopts the SPHC steel plate produced by the continuous casting and rolling process, and the chemical composition mass percentage is: C: 0.05%, Si: 0.013%, Mn: 0.24%, P : 0.016%, S: 0.013%, Al: 0.034%, Cr: 0.028%, Ni: 0.021%, Cu: 0.056%, As: 0.019%, and the balance is Fe and trace elements.

[0028] The technological process includes the following steps:

[0029] (1) Hot rolling: the slab goes through 5 rolling passes in sequence, namely the first pass, the second pass, the third pass, the fourth pass and the fifth pass, before entering the first pass The thickness of the slab is 14mm, and the thickness of the hot-rolled steel plate after the fifth pass is 2.35mm. The rolling speed of each pass increases successively, and the motor speed of the first pass to the fifth pass decreases successively. The hot rolling process parameters are s...

Embodiment 2

[0047]The annealing process of the hot-rolled steel plate produced by the thin slab continuous casting and rolling process, the raw material adopts the SPHC steel plate produced by the continuous casting and rolling process, and the chemical composition mass percentage is: C: 0.05%, Si: 0.013%, Mn: 0.24%, P : 0.016%, S: 0.013%, Al: 0.034%, Cr: 0.028%, Ni: 0.021%, Cu: 0.056%, As: 0.019%, and the balance is Fe and trace elements.

[0048] The technological process includes the following steps:

[0049] (1) Hot rolling: the slab goes through 5 rolling passes in sequence, namely the first pass, the second pass, the third pass, the fourth pass and the fifth pass, before entering the first pass The thickness of the slab is 14mm, and the thickness of the hot-rolled steel plate after the fifth pass is 2.35mm. The rolling speed of each pass increases successively, and the motor speed of the first pass to the fifth pass decreases successively. The hot rolling process parameters are sh...

Embodiment 3

[0067] The annealing process of the hot-rolled steel plate produced by the thin slab continuous casting and rolling process, the raw material adopts the SPHC steel plate produced by the continuous casting and rolling process, and the chemical composition mass percentage is: C: 0.05%, Si: 0.013%, Mn: 0.24%, P : 0.016%, S: 0.013%, Al: 0.034%, Cr: 0.028%, Ni: 0.021%, Cu: 0.056%, As: 0.019%, and the balance is Fe and trace elements.

[0068] The technological process includes the following steps:

[0069] (1) Hot rolling: the slab goes through 5 rolling passes in sequence, namely the first pass, the second pass, the third pass, the fourth pass and the fifth pass, before entering the first pass The thickness of the slab is 14mm, and the thickness of the hot-rolled steel plate after the fifth pass is 2.35mm. The rolling speed of each pass increases successively, and the motor speed of the first pass to the fifth pass decreases successively. The hot rolling process parameters are s...

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Abstract

The invention provides an annealing process for a hot-rolled steel sheet produced by a thin slab continuous casting and rolling process. The raw material is a steel sheet produced by thin slab continuous casting and rolling. The process flow includes the following steps: hot rolling, annealing, pickling, rinsing, drying Dry and smooth. The mature cold-rolled bell annealing process is applied to the softening annealing of the hot-rolled steel sheet produced by the thin slab continuous casting and rolling process, so that the formability of the steel sheet is close to or equal to that of the cold-rolled annealed sheet, which can be replaced by downstream users Cold-rolled sheets are used to reduce their raw material costs.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel plates, and in particular relates to an annealing process for hot-rolled steel plates produced by thin slab continuous casting and rolling processes. Background technique [0002] While thin slab continuous casting and rolling has brought many advantages to our country, due to its own high casting speed and high cooling speed process characteristics, the columnar crystals in the billet structure are developed, the equiaxed crystals are fine, and the precipitation and precipitation effects are exerted to the extreme, resulting in The internal structure of the final product is polygonal and too fine ferrite, the interlamellar spacing of pearlite is too small, the yield strength and tensile strength are relatively high, while the elongation, n and r values ​​are relatively low, which is beneficial to low-alloy high-strength steel. But it is obviously not good for stamping or cold forming ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D9/46C21D1/26C22C38/42
Inventor 张震么占坤苏毅尹环泽
Owner TANGSHAN BOHAI STEEL