Technology for on-line control of oxide scale structure of fine-grain hot-rolled steel bar

Abstract

The invention discloses a technology for on-line control of an oxide scale structure of a fine-grain hot-rolled reinforcing steel bar, which comprises the following equipment: a heating furnace, six roughing mill groups, six intermediate mill groups, six finishing mill groups, a high-pressure air-rich gas tank, four groups of temperature control water tanks, a high-pressure argon-rich gas tank and a cooling bed, and comprises the following process flows: heating a steel billet through the heating furnace for 80-100 minutes, and the tapping temperature is 1000 DEG C to 1050 DEG C. On the basis that the original fine-grain hot-rolled steel bar production technology is not changed, two groups of high-pressure air-rich gas boxes and high-pressure argon-rich gas boxes are innovatively transformed, so that the oxide scale structure on the surface of the fine-grain steel bar is improved. The thickness of the oxide scale on the surface of the produced fine grain steel bar is controlled to be 20-35 microns, the oxide scale is composed of FeO and 40-60% of Fe3O4, and the iron oxide is compact, good in adhesion with a base body and not prone to falling off.

Description

technical field [0001] The invention belongs to the technical field of steel oxide scale structure control, and in particular relates to a technology for on-line control of the scale structure of fine-grained hot-rolled steel bars. Background technique [0002] After the implementation of the new national standard of GB / T 1499.2-2018 hot-rolled steel bars, major domestic steel mills basically adopt micro-alloy strengthening technology and use alloy strengthening to improve product strength. The quality of products produced by this method can meet the requirements of the new national standard, but the cost is relatively high. High and susceptible to changes in alloy prices, companies have become very passive and are facing very severe pressure to survive. [0003] In order to solve this problem, major steel mills began to carry out technical research and development in the steel rolling process. By adjusting the steel rolling process, the comprehensive performance of the stee...

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Problems solved by technology

[0004] The invention is a technology for on-line control of the oxide scale structure of fine-grained hot-rolled steel bars, which mainly solves the problems of poor surface quality of steel bars and poor corrosion resistance caused by controlled rolling and temperature control technology.

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