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Carbon structural steel plate and preparation method thereof

A carbon structure and steel plate technology, applied in the field of carbon structural steel plate and its preparation, can solve the problems of low formability of carbon structural steel and the like

Inactive Publication Date: 2012-02-01
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem of low formability of carbon structural steel in the prior art, and aims to provide a carbon structural steel plate with low production cost and good formability and a preparation method thereof

Method used

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  • Carbon structural steel plate and preparation method thereof
  • Carbon structural steel plate and preparation method thereof

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preparation example Construction

[0018] According to the method for preparing a carbon structural steel plate of the present invention, the method comprises preparing a steel slab, and performing hot rolling, coiling, cold rolling and annealing the steel slab obtained above in sequence, wherein the cold rolling reduction rate can be 40-60 %, preferably 45-55%; the annealing temperature can be 650-700°C, preferably 660-680°C; the annealing temperature rise rate between 450°C and annealing temperature can be 30-45°C / hour, preferably 30- 40°C / hour. The carbon structural steel plate prepared under the above conditions has good yield strength, tensile strength and elongation after fracture, and the plastic strain ratio of the carbon structural steel plate is weighted average ( value) is high and has good formability.

[0019]The method for preparing a steel slab generally includes two steps of smelting and casting. In the smelting stage, the composition of the molten steel is adjusted to be consistent with the ...

Embodiment 1-4

[0030] This embodiment is used to illustrate the carbon structural steel plate provided by the present invention and its preparation method.

[0031] The steel slab with the chemical composition shown in Table 1 prepared by the method for continuous casting is used as raw material; The continuous casting slab made is coiled after heating, hot rolling and cooling on the hot continuous rolling mill; the prepared After the hot-rolled coils are cooled to room temperature, pickling is carried out, and then cold-rolled coils are produced on the combined cold continuous rolling mill (CDCM unit). Annealing. After cooling to room temperature, the annealed cold-rolled steel plate is tempered on a single-stand tempering unit. The main parameters of the preparation process are shown in Table 2.

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Abstract

The invention provides a carbon structural steel plate and a preparation method thereof. On the basis of the total weight of the carbon structural steel plate, the carbon structural steel plate comprises 0.12-0.17 wt% of C, 0.70-1 wt% of Mn, 0.015-0.07 wt% of Als, and 98.77-99.16 wt% of Fe, wherein, Als represents acid-soluble aluminum. According to a testing method prescribed by GB / T5027-2007, the carbon structural steel plate has a weighted average value of plastic strain ratio in the range from 1.3 to 1.8. By controlling a cold rolling reduction rate at 45-55%, an annealing temperature at 660-680DEG C, an annealing temperature rising rate at 30-40DEG C / h within a temperature range from 450DEG C to the annealing temperature, the method of the invention can process ordinary carbon structural steel into a carbon structural steel plate with a weighted average value of plastic strain ratio up to 1.3-1.8, thus substantially improving the deep-drawing shaping performance of the carbon structural steel plate.

Description

technical field [0001] The invention relates to a carbon structural steel plate and a preparation method thereof. Background technique [0002] In recent years, the domestic automobile industry has developed rapidly, which has put forward higher requirements for the variety and quality of cold-rolled steel sheets. At present, the development of cold-rolled automotive sheets presents two trends, one is to develop towards high-end products such as dual-phase steel and induced phase transformation plastic steel, and the other is to develop towards low-cost and high-performance. [0003] St37-2G is a carbon structural steel plate with a tensile strength of 360MPa imported from Germany. According to the DIN1623 (2) standard, its chemical composition meets: C≤0.17%, P, S≤0.035%, and its mechanical properties meet: yield Strength (R p0.2 or R eu ) is greater than or equal to 215Mpa, the tensile strength is 360-510Mpa, and the elongation after breaking (A 80 ) is greater than or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 郑之旺王敏莉梁英刘庆春王平利
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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