Low-compression-ratio ultra-thick specification low-temperature-resistant hot-rolled H-beam and production method thereof

Abstract

The invention discloses a low-temperature resistant hot rolling H section bar with low compression ratio and super-thick specification and a production method thereof and belongs to the field of hot rolling H section bars. The H section bar is prepared from the following chemical components in percentage by weight: 0.11-0.19% of C, 0.15-0.30% of Si, 1.30-1.55% of Mn, less than or equal to 0.02% of P, less than or equal to 0.008% of S, 0.008-0.020% of Ti, 0.015-0.055% of V and the balance of Fe and inevitable impurities. The production method of the H section bar sequentially comprises the following steps: smelting in a converter or electric furnace; LF (ladle furnace) refining; full protection continuous casting of a beam blank; heating; rolling; and cooling to finally obtain the low-temperature hot rolling H section bar, wherein the flange is over 30mm thick, the compression ratio is less than 3, and the surface is good in quality. The vertical average ballistic work at -20 DEG C is over 150J, so that the H section bar has a wide market application prospect.

Description

technical field [0001] The present invention relates to a hot-rolled H-shaped steel and its production method, more specifically, to a low-compression-ratio ultra-thick specification low-temperature-resistant hot-rolled H-shaped steel and its production method, which belongs to the flange thickness of more than 30 mm, compressed The ultra-thick gauge hot-rolled H-beam with a ratio of less than 3 has good low-temperature performance. Background technique [0002] Since 2008, southern China has suffered from cold weather disasters in winter, causing losses of tens of billions of yuan. At the beginning of 2011, a cold wave swept across the northern hemisphere, causing the winter temperature in 90% of the country to be around -10°C for a long time. From December 1, 2010 to January 30, 2011, the national average temperature was -6.0°C, which was higher than the same period of the year (- 4.9°C) was 1.1°C lower. In January 2011, the national average temperature was -8.4°C, which...

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Problems solved by technology

[0007] The metal deformation of the H-beam rolling process is complicated. The H-beam billet with thick flange has a single shape and the rolling compression ratio is small. It is not easy to rely on controlled rolling to refine the structure of the finished product. Poor post control cooling

Therefore, it is difficult to roll low-compression ratio super-thick specification low-temperature-resistant hot-rolled H-beams.

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