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Economical high-plasticity 360MPa grade structural steel plate and manufacturing method thereof

A technology for structural steel plates and manufacturing methods, which is applied in the field of economical high-plasticity 360MPa structural steel plates and its manufacturing, can solve problems such as deterioration of welding performance, low elongation of steel plates, poor welding performance, etc., and achieve strong adaptability and popularization, The effect of streamlining processing technology and reducing production cost

Active Publication Date: 2018-11-30
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: its steelmaking process is electric furnace-LF-VD vacuum treatment-continuous casting, the process is long, and the production cost is high. At the same time, the content of V added by it reaches 0.34~0.36%. Low Alloy Structural Steels
Its disadvantages are: the C content is low, and the accelerated cooling process with a large cooling rate is adopted, resulting in the elongation of the steel plate being lower than 30%, and more Ti is added to the steel, which is not good for low temperature impact and deteriorates the welding performance. and will lead to an increase in cost
[0006] The patent document with the Chinese patent application number 200910306428.8 discloses "a non-alloy structural steel S355J2 steel plate and its production method", its chemical composition is C: 0.12~0.18%, Si: 0.25~0.45%, Mn: 1.3~1.5 %, P: ≤0.02%, S: ≤0.014%, Als: 0.015~0.035%, V: 0.03~0.08%, the TMCP process used in its rolling has its disadvantages: the cost ratio of adding V to steel grades The invention is high, and V is unfavorable to low-temperature impact, which deteriorates welding performance
At the same time, the rolling process stops and the production efficiency decreases

Method used

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  • Economical high-plasticity 360MPa grade structural steel plate and manufacturing method thereof
  • Economical high-plasticity 360MPa grade structural steel plate and manufacturing method thereof
  • Economical high-plasticity 360MPa grade structural steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The components and weight percentages of the economical high-plasticity 360MPa grade structural steel plate include: C: 0.13%, Mn: 1.0%, Si: 0.20%, P: 0.015%, S: 0.005%, Ti: 0.025%, Als : 0.0195%, N: 0.0039%, the rest is Fe and unavoidable impurity elements.

[0055] The manufacturing method of the economical high plasticity 360MPa grade structural steel plate comprises the following steps:

[0056] (1) The original molten iron is desulfurized and pretreated by the KR furnace, and the S≤0.005% is controlled to obtain the low-sulfur molten iron out of the station;

[0057] (2) The above-mentioned low-sulfur molten iron is smelted in a converter, and the tapping time is controlled to be longer than 3 minutes. The slag-stopping cap and the slide plate are used to cooperate with the slag-stopping, and the P≤0.012% is controlled to obtain low-sulfur and low-phosphorus molten iron;

[0058] (3) Send the above-mentioned low-sulfur and low-phosphorus molten iron into the argon...

Embodiment 2

[0065] The components and weight percentages of the economical high-plasticity 360MPa grade structural steel plate include: C: 0.15%, Mn: 1.5%, Si: 0.25%, P: 0.022%, S: 0.008%, Ti: 0.030%, Als : 0.025%, N: 0.0042%, the rest is Fe and unavoidable impurity elements.

[0066] The manufacturing method of the economical high plasticity 360MPa grade structural steel plate comprises the following steps:

[0067] (1) The original molten iron is desulfurized and pretreated by the KR furnace, and the S≤0.005% is controlled to obtain the low-sulfur molten iron out of the station;

[0068] (2) The above-mentioned low-sulfur molten iron is smelted in a converter, and the tapping time is controlled to be longer than 3 minutes. The slag-stopping cap and the slide plate are used to cooperate with the slag-stopping, and the P≤0.012% is controlled to obtain low-sulfur and low-phosphorus molten iron;

[0069] (3) Send the above-mentioned low-sulfur and low-phosphorus molten iron into the argon ...

Embodiment 3

[0076] The components and weight percentages of the economical high-plasticity 360MPa grade structural steel plate include: C: 0.14%, Mn: 1.0%, Si: 0.35%, P: 0.020%, S: 0.004%, Ti: 0.035%, Als : 0.031%, N: 0.0030%, the rest is Fe and unavoidable impurity elements.

[0077] The manufacturing method of the economical high plasticity 360MPa grade structural steel plate comprises the following steps:

[0078] (1) The original molten iron is desulfurized and pretreated by the KR furnace, and the S≤0.005% is controlled to obtain the low-sulfur molten iron out of the station;

[0079] (2) The above-mentioned low-sulfur molten iron is smelted in a converter, and the tapping time is controlled to be longer than 3 minutes. The slag-stopping cap and the slide plate are used to cooperate with the slag-stopping, and the P≤0.012% is controlled to obtain low-sulfur and low-phosphorus molten iron;

[0080] (3) Send the above-mentioned low-sulfur and low-phosphorus molten iron into the argon ...

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Abstract

The invention discloses an economical high-plasticity 360MPa grade structural steel plate and a manufacturing method thereof, wherein the economical high-plasticity 360MPa grade structural steel platecomprises the following components in percentage by weight: 0.13-0.18% of C, 1.0-1.6% of Mn, 0.20-0.50% of Si, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.020-0.050% of Ti, greater than or equal to 0.015% of Als, less than or equal to 0.005% of N and balance Fe and unavoidable impurity elements. The yield strength of the steel plate provided by the invention at a normal temperature is greater than or equal to 360MPa; the tensile strength is greater than or equal to 500MPa; the ductility is greater than or equal to 30%; the yield ratio is less than or equal to 0.80;the ballistic work at minus 20 DEG C is greater than or equal to 180J; with high strength, high plasticity, low yield ratio and excellent welding performance, the economical high-plasticity 360MPa grade structural steel plate can meet the safety demands of bridge steel well; and with low alloy content, short process flow, high production efficiency and low manufacturing cost, the economical high-plasticity 360MPa grade structural steel plate conforms to the development demands of green and economical steel ball.

Description

technical field [0001] The invention relates to the technical field of high-plasticity steel plate manufacturing, in particular to an economical high-plasticity 360MPa structural steel plate and a manufacturing method thereof. Background technique [0002] With the development of bridges and buildings in China, steel structures, as modular products, are light in weight, easy to manufacture, and fast in production and installation, and are widely used. Therefore, the demand for low-alloy structural steel plates accounts for more than half of medium-thick plate products. The steel structure is required to be able to resist fracture damage under overload or local overload, and to prevent damage under dynamic load. It is required that the steel plates used have good plasticity and toughness, so as to ensure the safety of the steel structure. [0003] Before the present invention, there were many domestic reports on steel plates for high-plasticity low-alloy structures, and an in...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/06C21C5/28C21C7/072C21C7/076C21D8/02
CPCC21C5/28C21C7/0006C21C7/072C21C7/076C21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/14Y02P10/20
Inventor 余宏伟易勋黄道昌李相付王孝东卜勇张欢余爱华鲍海燕梁宝珠
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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