Corrosion-resistant hot-rolled ribbed steel bar with yield strength not less than 600Mpa and production method thereof

Abstract

The invention relates to a corrosion-resistant hot-rolled ribbed steel bar with yield strength not less than 600Mpa. The corrosion-resistant hot-rolled ribbed steel bar comprises the following components in percentage by weight: 0.17-0.28% of C, 0.50-0.90% of Si, 0.70-1.50% of Mn, 0.04-0.009% of P, not more than 0.015% of S, 0.08-0.15% of V and 0.025-0.045% of Nb. A production process comprises the following steps: desulfurizing molten iron; performing top and bottom combined blowing by virtue of a converter; refining by virtue of an argon station; refining by an LF (ladle furnace); performing continuous casting; stacking and cooling to a room temperature; heating a cast blank; performing rough rolling and finish rolling; naturally cooling to the room temperature. Compared with a steel bar with an epoxy resin coating, the corrosion-resistant hot-rolled ribbed steel bar has no defect of acceleration of corrosion rate caused by shedding of the coating; compared with the steel bar made of stainless steel, the corrosion-resistant hot-rolled ribbed steel bar has the advantage that the content of Cr is greatly reduced; compared with the ordinary steel bar, the corrosion-resistant hot-rolled ribbed steel bar has the advantage that the resistance to Cl ion corrosion is above 2 times higher than that of the ordinary steel bar; only the refining by virtue of the LF is additionally performed in an existing 400MPa grade steel bar process line, the increase in per ton of steel does not exceed 30 yuan, and then the production can be met.

Description

technical field [0001] The invention relates to a steel bar and a production method thereof, in particular to a ribbed steel bar and a production method thereof, and is especially suitable for a corrosion-resistant hot-rolled ribbed steel bar with a yield strength ≥ 600Mpa whose strength is increased through vanadium-niobium microalloy strengthening technology and production methods. Background technique [0002] With the development of large-scale and large-load domestic construction projects, the construction efficiency, energy conservation and environmental protection of building structures have attracted widespread attention, and the requirements for the performance of building steel bars are getting higher and higher. HRB600 corrosion-resistant steel bars are raw materials for manufacturing major engineering projects and high-strength civil engineering projects. Compared with the HRB400 steel bars widely used in the domestic construction industry at present, the streng...

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Problems solved by technology

[0007] The invention aims at the deficiency that the yield strength of the prior art is 400 MPa and cannot meet the development needs of the market, and provides a hot-rolled steel with a yield strength of more than 600 MPa, strong resistance to Cl ion corrosion, and the use of the current 400 MPa steel bar technology Corrosion-resistant hot-rolled ribbed steel bar with yield strength ≥ 600Mpa and production method without adding or modifying any equipment

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