HRB600 high-strength hot-rolling ribbed reinforcing bars with added ferro-silicon nitride and manufacturing method thereof

Abstract

The invention discloses an HRB600 high-strength hot-rolling ribbed reinforcing bars with added ferro-silicon nitride and a manufacturing method thereof. Components of the reinforcing bars comprise C,Si, Mn, P, S, Nb, V and the balance of Fe and impurities; the contents of the component elements simultaneously meet the condition that the carbon equivalent Ceq equaling to C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15 is less than or equal to 0.58 percent. The manufacturing method comprises the following steps: performing treatment on the added ferro-silicon nitride on an argon station and performing alloying,wherein the added ferro-silicon nitride is more easily bonded with N in steel because the affinity of V and N is greater than the affinity of V and C, so that VN is formed; and after the ferro-siliconnitride is added, a large quantity of V is separated out, so that VN and VC alloys are formed, and thus, precipitation and strengthening effects of the V and a crystal grain thinning effect are improved. According to the hot-rolling ribbed reinforcing bars provided by the invention, the ferro-silicon nitride is added in molten steel, and the VN alloy is replaced by a part of the ferro-silicon nitride, so that the use of the VN (Vanadium-Nitrogen) alloy is reduced, the cost is reduced a lot, the production processes are simple, and batch production is easily realized.

Description

technical field [0001] The invention relates to the technical field of steel manufacture, in particular to a HRB600 high-strength hot-rolled ribbed steel bar added with ferrosilicon nitride and a manufacturing method thereof. Background technique [0002] Hot-rolled ribbed steel bars are the main reinforcement materials for reinforced concrete building structures, which carry various loads such as tensile and compressive stresses and strains, rebar reprocessing effects (welding, mechanical connection, bending or straightening) and other loads in the structure, and are widely used. With the emergence of high-rise, long-span, earthquake-resistant, low-temperature-resistant, and fire-resistant building structures, users not only require steel bars to have high strength, but also require high toughness and good welding performance. [0003] With the sustained and stable economic development, a large number of hot-rolled ribbed steel bars for reinforced concrete need to be produc...

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Problems solved by technology

[0007] The purpose of the invention is to propose a HRB600 high-strength hot-rolled ribbed steel bar with ferrosilicon nitride added and a manufacturing method thereof, so as to solve the problems of large usage and high cost of the existing high-strength hot-rolled ribbed steel bar vanadium-nitrogen alloy, The specification of the steel bar is 6~16mm, and the heat treatment process is eliminated in the process. The yield strength at room temperature is ≥640MPa, the tensile strength is ≥860MPa, and the elongation is ≥18%. It has excellent low-temperature toughness and high strength, and is suitable for building ships and oceans. engineering steel structure

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