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Micro-titanium alloying Q355B medium-thickness steel plate and low-cost production method therefor

A technology of micro-titanium alloy and production method, which is applied in the field of iron and steel metallurgy, can solve the problems that the blank affects the continuous production rhythm, etc., and achieve the effects of improving internal quality, promoting further refinement of the structure, improving rolling efficiency and controlling the uniformity of performance

Active Publication Date: 2021-02-05
SHAGANG GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Technical problem to be solved: Aiming at the technical problem in the prior art that the temperature of the billet in the rolling process of 30-40 mm medium-thick Q355B steel plate will affect the rhythm of continuous production, the invention provides a kind of micro-titanium alloyed Q355B medium-thick steel plate, which has No addition of V, Nb, Cu and other precious elements, no need for controlled rolling, can greatly improve the production rhythm, etc.

Method used

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  • Micro-titanium alloying Q355B medium-thickness steel plate and low-cost production method therefor

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Embodiment 1

[0021]In this embodiment, the thickness of the micro-titanium alloyed Q355B medium-thick steel plate is 32 mm, and its chemical composition according to the mass fraction is as follows: C: 0.16%, Si: 0.19%, Mn: 1.52%, Al: 0.038%, Ti: 0.029%, Cr: 0.03%, P: 0.009%, S: 0.002%, N: 0.0034%, the rest is iron and inevitable impurity elements, of which Ceq: 0.41%.

[0022]The low-cost production method of the above-mentioned micro-titanium alloyed Q355B medium-thick steel plate, the steps are as follows: preparing the steel composition according to the mass percentage, hot metal KR pre-desulfurization, converter smelting, LF refining, soft stirring, slab continuous casting, slab reheating, Rough rolling, finishing rolling, rapid cooling of steel plate, hot steel straightening, upper cooling bed cooling, shearing, storage, among which after KR desulfurization treatment, the S content of molten iron is 0.006%; after LF refining treatment, the S content of molten steel is 0.002 %; soft stirring t...

Embodiment 2

[0024]In this embodiment, the thickness of the micro-titanium alloyed Q355B medium-thick steel plate is 34 mm, and its chemical composition according to the mass fraction is as follows: C: 0.15%, Si: 0.20%, Mn: 1.49%, Al: 0.036%, Ti: 0.032%, Cr: 0.03%, P: 0.01%, S: 0.001%, N: 0.0038%, the rest is iron and unavoidable impurity elements, of which Ceq: 0.40%.

[0025]The low-cost production method of the above-mentioned micro-titanium alloyed Q355B medium-thick steel plate, the steps are as follows: preparing the steel composition according to the mass percentage, hot metal KR pre-desulfurization, converter smelting, LF refining, soft stirring, slab continuous casting, slab reheating, Rough rolling, finishing rolling, rapid cooling of steel plate, hot steel straightening, upper cooling bed cooling, shearing, storage, among which after KR desulfurization treatment, the S content of molten iron is 0.006%; after LF refining treatment, the S content of molten steel is 0.002 %; soft stirring t...

Embodiment 3

[0027]In this embodiment, the thickness of the micro-titanium alloyed Q355B medium-thick steel plate is 36 mm, and its chemical composition according to the mass fraction ratio is as follows: C: 0.16%, Si: 0.20%, Mn: 1.48%, Al: 0.030%, Ti: 0.031%, Cr: 0.02%, P: 0.01%, S: 0.001%, N: 0.0035%, the rest is iron and inevitable impurity elements, of which Ceq: 0.41%.

[0028]The low-cost production method of the above-mentioned micro-titanium alloyed Q355B medium and thick steel plate, the steps are as follows: preparing the steel composition according to the mass percentage, hot metal KR pre-desulfurization, converter smelting, LF refining, soft stirring, slab continuous casting, slab reheating, Rough rolling, finishing rolling, steel plate rapid cooling, steel plate hot leveling, upper cooling bed cooling, shearing, storage, in which after KR desulfurization treatment, the S content of molten iron is 0.005%; after LF refining treatment, the S content of molten steel is 0.002 %; soft stirri...

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Abstract

The invention discloses a micro-titanium alloying Q355B medium-thickness steel plate and a low-cost production method therefor, and belongs to the technical field of ferrous metallurgy. The steel plate comprises the following chemical components in percentage by mass: 0.15-0.18% of C, less than or equal to 0.24% of Si, less than or equal to 1.60% of Mn, 0.020-0.045% of Al, 0.020-0.040% of Ti, lessthan or equal to 0.10% of Cr, less than or equal to 0.025% of P, less than or equal to 0.008% of S, less than or equal to 0.080% of N, and the balance of iron and inevitable impurity elements. In order to solve the technical problem that in the prior art, the continuous production rhythm can be affected due to the fact that a blank needs to be kept warm in the rolling process of a 30-40 mm medium-thickness Q355B steel plate, the micro-titanium alloying Q355B medium-thickness steel plate has the advantages that precious elements such as V, Nb and Cu are not added, controlled rolling is not needed, and the production rhythm can be greatly improved.

Description

Technical field[0001]The invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a micro-titanium alloyed Q355B medium-thick steel plate and a low-cost production method thereof.Background technique[0002]Q355B is currently widely used in mining machinery, bridges and other structures and mechanical parts that carry dynamic loads. With the continuous progress of infrastructure construction in my country and other countries in the world, the demand for Q355B is increasing day by day, and it has become one of the steel grades commonly produced in batches by major domestic steel companies. Among them "Q" means the yield strength, 355 means that the yield strength of this steel is 355MPa, and the yield value will decrease as the thickness of the material increases. Therefore, the actual production process of steel plates with different specifications and thicknesses is not the same.[0003]In the prior art, 30-40 mm medium-thickness Q355B steel pl...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/28C22C38/38C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C38/28C22C38/38C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D2211/005C21D2211/009Y02P10/20
Inventor 郭志龙周子夜林涛铸聂文金李冉雒广杰
Owner SHAGANG GROUP
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