Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars

Abstract

The invention discloses steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and a production method of the high-strength steel bars and belongs to the technical field of hot-rolling ribbed steel bars. The steel for the hot-rolling ribbed high-strength steel bars contains the chemical components including, by mass, 0.20-0.50% of C, 0.80-1.20% of Si, 1.00-1.50% of Mn, 0.10-0.25% of V, 0.015-0.025% of N, 0.40-1.00% of Cr, 0-0.025% of P, 0-0.010% of S, and the balance Fe and inevitable impurity elements. By means of the microalloying design, converter (or electric-arc furnace) steel-making and bar low-temperature temperature-controlling rolling technology, under the conditions of existing technology equipment of steel enterprises and proper 10% increase of motor power, large-scale industrial production of the steel bars of 700 Mpa can be achieved, and thus the demands of high-rise and long-span reinforced concrete building structures in China are met.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled ribbed steel bars, and more specifically relates to a steel for hot-rolled ribbed high-strength steel bars above 700Mpa and a production method thereof. Background technique [0002] Commonly known as hot-rolled ribbed steel bar is rebar, which is widely used in civil engineering construction such as houses, bridges, and roads. At present, the use of hot-rolled ribbed steel bars at home and abroad is that 335Mpa grades have long been eliminated. Foreign countries such as Britain, Germany, Australia, and France have widely used high-strength steel bars with a yield strength of 500Mpa. 700Mpa grade high-strength steel bars. In recent years, with the introduction of a series of high-strength steel promotion and application policies in my country, the percentage of high-strength steel consumption has increased year by year. At present, domestic HRB500 high-strength steel bars have been mass-produ...

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Problems solved by technology

[0007] Aiming at the problem that existing hot-rolled ribbed steel bars cannot meet the strength requirements of building structures, the present invention provides a steel for hot-rolled ribbed high-strength steel bars above 700Mpa and its production method; adopting micro-alloying design, converter (or electric arc Furnace) steelmaking, bar low-temperature temperature-controlled rolling process, under the condition of the existing process equipment of steel enterprises and the appropriate increase of motor power by 10%, large-scale industrial production of 700Mpa steel bars can be realized to meet the needs of high-rise and long-span steel bars in my country The need for concrete building structures

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