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Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel

A technology for structural and H-shaped steel, which is applied in the field of metallurgy, low-temperature resistant low-alloy high-strength structural steel, and can solve problems such as low nitrogen, oxygen content, increased cost, and infeasibility

Active Publication Date: 2012-08-01
LAIWU IRON & STEEL GRP
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the addition of Nb and B, the cost of the product is increased. At the same time, it is necessary to maintain a low nitrogen and oxygen content. The process uses aluminum deoxidation to ensure a good deoxidation effect. , aluminum deoxidation is not feasible

Method used

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  • Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel
  • Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel
  • Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel

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Embodiment

[0023] The process route is:

[0024] Hot metal pre-desulfurization→converter smelting→LF refining→full-protection continuous casting of special-shaped billet→1-3 rolling mill arrangement type production line rolling→inspection and storage.

[0025] The main technological measures of the preparation method:

[0026] (1) The molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be ≤0.010wt% after desulfurization.

[0027] (2) Converter smelting: The raw materials entering the furnace must meet the following requirements: the sulfur content of molten iron is ≤0.010wt%; the operation with a large amount of slag and low gun position is adopted, and the slag is divided into two batches during the blowing process (the first batch adds 2 / 3 slag ) is added, and the slag is melted and thoroughly melted throughout the process. The ladle adopts a red net ladle with good bottom blowing, and the baking temperature is ≥800°C. Alloy...

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Abstract

The invention provides hot-rolled H-steel for a low temperature-resistance structure and a preparation method for the hot-rolled H-steel. The hot-rolled H-steel for the low temperature-resistance structure comprises the chemical components in weight percentage: 0.12-0.22 percent of C, 0.10-0.40 percent of Si, 1.1-1.50 percent of Mn, not greater than 0.025 percent of P, not greater than 0.025 percent of S, 0.01-0.05 percent of V and the balance of Fe and trace impurity. According to the hot-rolled H-steel for the low temperature-resistance structure, mainly through reducing sulphur content and employing vanadium for microalloying without adding other elements, immersion-type flat water gap fully-protective casting is adopted in the continuous casting process. Because of the complexity of a beam blank continuous casting machine, aluminium deoxidation is not adopted. Therefore, the low temperature-resistance steel provided by the invention is good in mechanical property, and the average longitudinal impact power is 90J at the temperature of -20 DEG C.

Description

technical field [0001] The invention relates to metallurgical technology, and belongs to low-temperature-resistant low-alloy high-strength structural steel, in particular to a hot-rolled H-shaped steel for low-temperature-resistant structure and a preparation method thereof. Background technique [0002] H-beams for low-temperature resistant structures are mainly used in buildings, ships, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other high-load steel structures in alpine regions. This steel contains less non-metallic materials and has the characteristics of impact resistance under low temperature conditions. [0003] Chinese invention patent application CN101255527A (application number 200810014488.8) discloses a boron-added H-shaped steel with good low-temperature impact toughness and its preparation method. The steel composition weight percentage of this invention is: C0.08~0.20%, Mn1.00~1.60% ...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21C1/02C21C5/35C21C7/076B22D11/18
CPCY02P10/20
Inventor 付常伟袁鹏举韩蕾蕾邓存善郭跃华李超宋玉卿韩文习高祥明朱京军王刚方金林
Owner LAIWU IRON & STEEL GRP
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