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Steel and production method thereof

A production method and molten steel technology, applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of unmentioned steel plate performance indicators, high cost, long production cycle, etc., and achieve the effect of excellent anti-lamellar tearing performance.

Active Publication Date: 2011-10-05
LAIWU STEEL YINSHAN SECTION CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In the Chinese patent CN1609257A, in terms of steel composition design, the addition of extremely low carbon, Cu-Cr-Ni-Mo-Nb and two or more composite additions of Ti-Al-Zr-RE or Ca are adopted. Thermomechanical controlled rolling technology + relaxation-precipitation control technology to produce a weather-resistant bridge steel mainly composed of acicular ferrite structure. The yield strength of the steel is greater than 490MPa, the tensile strength is greater than 590MPa, and the impact energy at -40℃ More than 210J, excellent overall performance, the disadvantage is that a large amount of Cu-Cr-Ni-Mo-Nb precious metals are added, and the cost is high
[0005] In the Chinese patent CN101403075A, low C and high Mn are used in the composition design of the steel, and Cu-Cr-Ni-Ti-Nb elements are added at the same time, and the thermomechanical control rolling process is adopted. The yield strength of the steel is greater than 460MPa, and the tensile strength is It is greater than 590MPa, and the impact energy at -40°C is greater than 100J. The disadvantage is that a large amount of Cu-Cr-Ni precious metals are added, and the cost is high. Moreover, the invention is only smelted and rolled in the laboratory, and has not been applied to industrial production.
[0006] In the Chinese patent CN101333628A, low C and high Mn are used in the composition design of the steel, and Cu-Cr-Ni-Mo-Nb-Ti elements are added at the same time, and the thermomechanical controlled rolling and tempering process is adopted. The yield strength of the steel is greater than 430MPa, the tensile strength is greater than 550MPa, and the impact at -40°C is greater than 200J. The disadvantage is that a large amount of Cu-Cr-Ni-Mo precious metals are added, and tempering heat treatment is required, the production cycle is long and the cost is high
[0007] In addition, none of the above Chinese patents mentioned the performance index of the steel plate in terms of lamellar tear resistance

Method used

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  • Steel and production method thereof
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  • Steel and production method thereof

Examples

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example 1

[0060] The steel in this example is for a bridge and contains by weight 0.16% C, 0.48% Si, 1.47% Mn, 0.004% S, 0.012% P, 0.050% Nb, 0.021% Ti, 0.052 % V, 0.18% Ni, 0.032% Als, no more than 40×10 -6 N, no more than 40×10 -6 O and no more than 2 x 10 -6 H, the balance is Fe and unavoidable impurities.

[0061] The steel is produced through molten iron pretreatment, converter smelting with combined top and bottom blowing, LF refining, RH refining, continuous casting of slabs, slow cooling of billets, rolling of 4300mm wide and thick plates, and slow cooling of finished products. The operation steps are as follows:

[0062] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.008%, the temperature is 1250°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter, the nickel plate is added into the converter together with the scrap bucke...

example 2

[0065] The steel in this example is for a bridge and contains by weight 0.15% C, 0.40% Si, 1.43% Mn, 0.005% S, 0.013% P, 0.042% Nb, 0.023% Ti, 0.042 % V, 0.15% Ni, 0.033% Als, no more than 40×10 -6 N, no more than 40×10 -6 O, no more than 2×10 -6 H, the balance is Fe and unavoidable impurities.

[0066] The steel is produced through molten iron pretreatment, converter smelting with combined top and bottom blowing, LF refining, RH refining, continuous casting of slabs, slow cooling of billets, rolling of 4300mm wide and thick plates, and slow cooling of finished products. The operation steps are as follows:

[0067] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.005%, the temperature is 1267°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter, and the nickel plate is added into the converter together with the scrap steel ...

example 3

[0070] The steel in this example is for a bridge and contains by weight 0.13% C, 0.26% Si, 1.24% Mn, 0.005% S, 0.010% P, 0.017% Nb, 0.024% Ti, 0.021 % V, 0.10% Ni, 0.025% Als, no more than 40×10 -6 N, no more than 40×10 -6 O, no more than 2×10 -6 H, the balance is Fe and unavoidable impurities.

[0071] The steel is produced through molten iron pretreatment, converter smelting with combined top and bottom blowing, LF refining, RH refining, continuous casting of slabs, slow cooling of billets, rolling of 4300mm wide and thick plates, and slow cooling of finished products. The operation steps are as follows:

[0072] Desulfurization of molten iron strictly follows the process regulations, the sulfur in the molten iron is controlled at 0.013%, the temperature is 1310°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter, the nickel plate is added into the converter together with the scrap bucket, th...

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Abstract

The invention provides steel and a production method thereof. The steel comprises the following components in percentages by weight: 0.12% to 0.17% of C, 0.20% to 0.50% of Si, 1.15% to 1.55% of Mn, not larger than 0.010% of S, not larger than 0.020% of P, 0.010% to 0.060% of Nb, 0.008% to 0.030% of Ti, 0.010% to 0.060% of V, 0.10% to 0.35% of Ni, 0.015% to 0.060% of Als, not larger than 40*10<-6> of N, not larger than 40*10<-6> of O, not larger than 2*10<-6> of H and the balance of Fe and inevitable impurities, wherein Als indicates acid-soluble aluminium. The production method of the steel comprises the steps of pretreatment of molten iron, smelting of top and bottom combined blown converter, LF (Ladle Furnace) refining and RH (Ruhrstahl Heraeus) vacuum cycle degassing which are conducted sequentially. The steel produced according to one aspect of the invention has excellent lamellar tearing resistant performance, low-temperature impact resistant performance and aseismatic performance and can satisfy the requirements of modern bridge engineering for high-performance bridge steel plates.

Description

technical field [0001] The invention relates to a steel and its production method, in particular to a lamellar tear-resistant steel and its production method. Background technique [0002] Lamellar tearing is an internal stress crack along the rolling direction. Generally speaking, lamellar tearing is related to welded joints, and lamellar tearing is prone to occur in multi-pass weldments of thick steel plates with T-shaped, angled or cross-shaped joints. For marine structures, large-scale composite beam structures, beam-column connections of high-rise steel structures and box-column corners, suspender plates of suspension bridges, and cross joints of bridge decks, the welding parts are very constrained in the direction of plate thickness. , and the amount of welding is large, so the risk of lamellar tearing is very high. Therefore, such structures are usually built with steel plates that can resist lamellar tearing to ensure the safety of the components. [0003] With th...

Claims

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Application Information

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IPC IPC(8): C21C5/35C22C38/12C21C7/064C21C7/10C21C7/00C22C38/14
CPCY02P10/20
Inventor 杨建勋周平刘菲王建景李灿明薛孝存杜航
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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