A kind of corrosion-resistant steel bar based on the durability of concrete structure and its preparation method

Abstract

The invention relates to an anti-corrosion reinforcing steel bar capable of increasing concrete structure durability and a preparation method thereof and belongs to the technical field of anti-corrosion steel and production technology control. The anti-corrosion reinforcing steel bar comprises, by weight percentage, not more than 0.1% of C, 0.2-0.6% of Si, 0.5-1.5% of Mn, not more than 0.03% of P,not more than 0.02% of S, 9-11% of Cr, 0.01-0.03% of Ti, 0.02-0.04% of Nb, 0.01-0.25% of N, not more than 1% of Ni, not more than 2% of Mo and the balance Fe. The anti-corrosion reinforcing steel barhas the advantages that by adding certain components and optimizing multiple components, the anti-corrosion reinforcing steel bar is excellent in chloride ion corrosion resistance, stable in comprehensive mechanical performance and especially good in durability in reinforced concrete components; the yield strength Re of the anti-corrosion reinforcing steel bar is not smaller than 800Mpa, the tensile strength Rm of the anti-corrosion reinforcing steel bar is not smaller than 900Mpa, and the elongation A of the anti-corrosion reinforcing steel bar is not smaller than 7%; the pitting corrosion resistance index PRE of the anti-corrosion reinforcing steel bar reaches 9.16-18; the depassivation chloride ion concentration CTL of the anti-corrosion reinforcing steel bar is increased by dozens oftimes, and accordingly the durability cycle of the reinforced concrete components is increased greatly.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant steel and its production technology control, in particular to a corrosion-resistant steel bar based on the durability of concrete structures and a preparation method thereof, which has excellent durability and corrosion performance. Background technique [0002] Concrete construction steel is one of the most widely used steel materials in my country. There are widespread cases of premature failure of concrete structures in marine environments due to chloride ion attack and carbonation of concrete, resulting in huge economic losses. According to statistics, 89% of my country's seaports and wharves have been damaged by corrosion to varying degrees after 7-25 years of use, and a large number of industrial and civil buildings in coastal areas have corroded and peeled steel bars after about 10 years of use. At present, with the country's increasing efforts to develop my country's marine re...

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent Document 1: The invention patent number is ZL2013 1 0547790.0, a national patent, which applies for the protection of "a low-carbon, high-Cr, high-N, strong corrosion-resistant steel and its production method". This patent develops corrosion-resistant steel, Through the addition of anti-corrosion elements and the application of steel rolling process, high chromium steel has a certain ability to resist uniform corrosion, but the pitting corrosion resistance of the steel under extremely harsh environmental conditions and the durability of reinforced concrete components need to be improved

However, due to the addition of a large number of alloying elements such as 1.5% Ni, <0.5% Mo, ≤1.0% Cu, etc., the cost of the alloy and steelmaking process is greatly increased, and the difficulty of the continuous casting process is greatly increased, which is not conducive to performance. The promotion of the high-strength steel bar

Images