Low-carbon phosphorus-added high-yield-strength cold rolled steel sheet and manufacturing method thereof

A cold-rolled steel plate and manufacturing method technology, applied in the directions of temperature control, manufacturing converter, rolling force/roll gap control, etc., can solve the problems of insignificant precipitation strengthening effect, increase of process cost, increase of refining process, etc., and achieve production The effect of low cost, low production cost and huge market prospect

Inactive Publication Date: 2010-04-28
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of precious metal elements, the cost of raw materials is high, and it is necessary to increase the refining process outside the vacuum treatment furnace during smelting, which increases the process cost a lot. In addition, due to the low yield of niobium, titanium and other elements, the process control is difficult and the precipitation strengthening effect is not good. obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The composition of the steel plate is: C: 0.03, Si: 0.25, Mn: 0.40, P: 0.10, S: 0.010, Als: 0.07, and the balance is Fe and unavoidable impurities.

[0029] Manufacturing method:

[0030] Desulfurization of molten iron is combined blowing in a converter, adding an appropriate amount of medium-carbon ferromanganese, ferrosilicon and ferrophosphorus for alloying treatment, controlling the weight percentage of Mn in the finished steel to 0.40%, and the weight percentage of P to 0.10%. After argon continuous casting, the thickness of the continuous casting billet is 250mm, and then hot rolling is carried out. The final rolling temperature of the hot rolling process is controlled at 870-890°C. ℃, the steel plate thickness is controlled to be 2.8mm during hot continuous rolling. Rinse with clean water after pickling with 10% dilute hydrochloric acid. During continuous cold rolling, the total reduction rate is controlled to be 64%, and the finished steel plate is ...

Embodiment 2

[0033] The composition of the steel plate is C: 0.07, Si: 0.10, Mn: 0.70, P: 0.06, S: 0.010, Als: 0.03, and the balance is Fe and unavoidable impurities.

[0034] Manufacturing method:

[0035]Desulfurization of molten iron is combined blowing in a converter, and an appropriate amount of medium-carbon ferromanganese, ferrosilicon and ferrophosphorus are added for alloying treatment. The weight percentage of Mn in the finished steel is controlled to be 0.70%, and the weight percentage of P is 0.06%. After argon continuous casting, the thickness of the continuous casting billet is 250mm, and then hot rolling is carried out. The final rolling temperature of the hot rolling process is controlled at 880-900°C. ℃, the steel plate thickness is controlled to be 5.5mm during hot continuous rolling. Rinse with clean water after pickling with 10% dilute hydrochloric acid. During continuous cold rolling, the total reduction rate is controlled to be 60%, and the finished steel plate is 2...

Embodiment 3

[0038] The composition of the steel plate is C: 0.08, Si: 0.15, Mn: 0.50, P: 0.08, S: 0.005, Als: 0.02, and the balance is Fe and unavoidable impurities.

[0039] Manufacturing method:

[0040] Desulfurization of molten iron is combined blowing in a converter, and an appropriate amount of medium-carbon ferromanganese, ferrosilicon and ferrophosphorus are added for alloying treatment. The weight percentage of Mn in the finished steel is controlled to be 0.50%, and the weight percentage of P is 0.08%. After argon continuous casting, the thickness of the continuous casting billet is 250mm, and then hot rolling is carried out. The final rolling temperature of the hot rolling process is controlled at 870-890°C. ℃, the steel plate thickness is controlled to be 2.8mm during hot continuous rolling. Rinse with clean water after pickling with 12% dilute hydrochloric acid. The total reduction rate is controlled at 70% during cold rolling, and the finished steel plate has a thickness of...

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Abstract

The invention discloses a low-carbon phosphorus-added high-yield-strength cold rolled steel sheet and a manufacturing method thereof. The steel sheet comprises the following components in percentage by weight: 0.03 to 0.08 percent of C, 0.10 to 0.25 percent of Si, 0.40 to 0.70 percent of Mn, 0.06 to 0.10 percent of P, less than or equal to 0.010 percent of S, 0. 03 to 0.07 percent of Als, and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of hot metal desulfurization, converter combined blowing, argon blowing, continuous casting, hot continuous rolling, laminar cooling, coiling, pickling, cold continuous rolling, batch annealing, leveling and finishing. Tests confirm that the preparation method is easy to control chemical composition of steel, low in production cost and simple in production process and obviously has the advantage of low production cost and the characteristic of high finished product rate.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production, and in particular relates to a low-carbon, phosphorus-added, high-yield-strength cold-rolled steel plate and a manufacturing method thereof. Background technique [0002] Among the new materials for automobiles, in order to meet the lightweight of the car body, the cold-rolled steel plates of safety structural parts such as the brackets, reinforcement plates, and connecting plates of the car require thinner steel plates and excellent stamping formability. High enough yield strength to meet the crash safety requirements of cars. Automotive safety structural parts are made of steel plates stamped and then welded and painted. In order to ensure the balance, stability and corrosion resistance of the car, cold-rolled steel plates are required to have high yield strength, high dimensional accuracy, surface quality, weldability and high paintability. Therefore, under the premise ...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21C1/02C21C5/30C21C7/072C21D8/02C21D1/26B21B37/74B21B37/58
Inventor 刘浩孙方义叶仲超钟定忠陈宇余晓静方芳
Owner WUHAN IRON & STEEL (GROUP) CORP
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