Economical thin-specification Q355B steel plate and preparation method thereof

A Q355B, thin-gauge technology, applied in the field of economical thin-gauge Q355B steel plate and its preparation, can solve the problems of slow rolling rhythm, achieve high rolling efficiency, improve rolling efficiency, and improve product performance

Inactive Publication Date: 2021-01-26
SHAGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem to be solved: This application mainly proposes an economical thin-gauge Q355B steel plate and its preparation method, which solves the technical problems in the prior art that the rolling process needs to be temperature-controlled rolling, and the rolling rhythm is relatively slow.

Method used

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  • Economical thin-specification Q355B steel plate and preparation method thereof
  • Economical thin-specification Q355B steel plate and preparation method thereof
  • Economical thin-specification Q355B steel plate and preparation method thereof

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Embodiment

[0031] An economical thin-gauge Q355B steel plate, the economical thin-gauge Q355B steel plate contains components and weight percentages: C 0.16-0.19%, Si≤0.24%, Mn≤0.95%, Al 0.020-0.045%, Nb 0.008 ~0.015%, Cr≤0.10%, P≤0.025%, S≤0.008%, N≤0.080%, and the rest are iron and unavoidable impurity elements.

[0032] The carbon equivalent Ceq[=C+Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15] of the economical thin gauge Q355B steel plate is ≤ 0.45%.

[0033] The process route for preparing economical thin-gauge Q355B steel plate is: hot metal KR pre-desulfurization, converter smelting, LF refining, soft stirring, slab continuous casting, slab reheating, rough rolling, finish rolling, rapid cooling of steel plate, hot straightening of steel plate , Cooling on the cooling bed, shearing, storage.

[0034] After the KR pre-desulfurization treatment of the molten iron, the S content of the molten iron is ≤0.010%, and after the treatment in the LF refining furnace, the S content of the molten steel is ≤0...

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Abstract

The invention discloses an economical thin-specification Q355B steel plate and a preparation method thereof. The economical thin-specification Q355B steel plate comprises the following components of,in percentage by weight, 0.16%-0.19% of C, less than or equal to 0.24% of Si, less than or equal to 0.95% of Mn, 0.020%-0.045% of Al, 0.008%-0.015% of Nb, less than or equal to 0.10% of Cr, less thanor 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 iron and inevitable impurities. The process route comprises the steps of molten iron KR pre-desulfurization, converter smelting, LF refining, soft stirring, slab continuous casting, slab reheating, rough rolling, finish rolling, steel plate rapid cooling, steel plate hot straightening, cooling on a cooling bed, shearing and warehousing.

Description

technical field [0001] The invention belongs to the technical field of structural steel metallurgy, and in particular relates to an economical thin Q355B steel plate and a preparation method thereof. Background technique [0002] Q355B is currently widely used in structures and mechanical parts that carry dynamic loads such as mining machinery and bridges. 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 generally mass-produced by major domestic iron and steel enterprises. [0003] The demand for Q355B continues to increase. In the past, steel plates of similar specifications often used a C-Mn-based composition system. Higher Mn content increased production costs. In addition, higher Mn content easily produced inclusions such as MnS, which affected performance. [0004] At present, the domestic production of steel plates with si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C21D6/00C21D8/02C21D9/00C22C33/04B21B1/46
CPCB21B1/463C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/005C21D2211/009C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/26
Inventor 周子夜林涛铸聂文金李冉郭志龙赵辉芮丰盛
Owner SHAGANG GROUP
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