Boracic deep low temperature hot rolling H-section steel and preparation method thereof

A H-shaped steel, deep technology, applied in the field of metallurgy, can solve the problems of large amount of boron added, not strict gas control, etc., achieve the effect of simple production process, reduce strength, and improve comprehensive performance

Inactive Publication Date: 2015-07-29
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

"A Hot-Rolled H-shaped Steel Containing Boron and Vanadium with Excellent Low-Temperature Impact Toughness and Its Preparation Method" is high in carbon, with a large amount of boron added, without aluminum control, and gas control is not strict

Method used

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  • Boracic deep low temperature hot rolling H-section steel and preparation method thereof
  • Boracic deep low temperature hot rolling H-section steel and preparation method thereof
  • Boracic deep low temperature hot rolling H-section steel and preparation method thereof

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Embodiment 1

[0035] The chemical composition weight percentage of steel is: C 0.13%, Si 0.20%, Mn 1.25%, P0.005%, S0.005%, N 0.0050%, V0.07%, B 0.01%, Alt 0.028%, the rest is Fe , The production methods in turn include 100t converter, refining outside the furnace, VD vacuum, continuous casting, heating, and universal rolling. The parameters of each step are: 100t converter is used for smelting, the end point of converter is controlled by C 0.06%, P 0.02%, S 0.04%, and the tapping temperature at the end point of converter is controlled at 1650°C; the amount of slag and alloy added during refining outside the furnace includes: lime 360 ​​kg, 400 kg of ferromanganese, 100 kg of ferrosilicon, 240 kg of silicomanganese, 70 kg of ferro-vanadium, 152 kg of aluminum wire; LF in-position temperature 1523°C, LF off-position temperature 1640°C, heating time 50 minutes, LF refining time 63 minutes; LF on-site molten steel composition weight percentage is C0.11%, Si0.06%, Mn1.02%, P0.02%, S0.03%, Al0.0...

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Abstract

The invention discloses a boracic deep low temperature hot rolling H-section steel and a preparation method thereof. The specification range of the H-section steel is in a small specification of below H300*300*10*15, and the H-section steel has the performance requirements that the longitudinal low-temperature impact of wing plates at the temperature of -50 to -70 DEG C is greater than or equal to 80J, the transverse low-temperature impact of the wing plates at the temperature of -20 DEG C is greater than or equal to 70J, the longitudinal low-temperature impact of web plates at the temperature of -50 to -70 DEG C is greater than or equal to 100J, and the performance of the steel is higher than that of the national standard GB/T1591-2008 low-medium high-strength structure E-level steel that the low-temperature impact is greater than or equal to 34J at -40 DEG C. In order to guarantee deep low temperature impact toughness, the low temperature impact toughness is guaranteed by adopting the cooperation of low carbon, low silicon, high manganese and vanadium boron. The H-section steel comprises the following chemical components in percentage by weight: 0.06% to 0.15% of C, 0.15% to 0.25% of Si, 1.0% to 1.50% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.010% of S, 0.070% to 0.10% of V, 0.005% to 0.02% of B, greater than or equal to 0.025% of Alt, smaller than or equal to 2.0*10<-4> of [H], smaller than or equal to 20*10<-4> of [O], smaller than or equal to 60*10<-4> of [N] and the balance of Fe. The production technology comprises the steps of furnace revolving, LF refining, VD vacuum, matrix blank continuous casting, H-section steel rolling and straightening.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for producing boron-containing deeply low-temperature hot-rolled H-shaped steel by using a rectangular billet and a preparation method thereof. Background technique [0002] The temperature in Northwest and Northeast China is cold in winter, and the impact toughness of structural steel needs to reach about -50°C; in addition, in the construction of offshore oil platforms, polar development, and other special uses, as well as exports to Russia and other countries, hot-rolled H-beams are required to meet - 50 ℃ to -70 ℃ impact toughness technical requirements. For example, the S275NL, S355NL, S420N, and S460NL series produced by the European standard EN10025-3 require -50°C impact energy ≥ 27J; С345К and С375 steel grades require -70°C impact energy ≥ 29J. [0003] There are two main ways to ensure the low-temperature impact toughness of hot-rolled H-shaped steel: one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 冯岩青
Owner INNER MONGOLIA BAOTOU STEEL UNION
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