A kind of corrosion-resistant steel bar and its production method

Abstract

The invention provides an anticorrosion rebar and a production method of the anticorrosion rebar. The anticorrosion rebar comprises 0.15%-0.23% of C, 0.30%-0.65% of Si, 0.90%-1.60% of Mn, 0.030% of P or less, 0.020% of S or less, 1.40%-2.50% of Cr, 0.20%-0.40% of Cu, 0.010%-0.025% of Ti, 0.015% of N or less and 0.0020% of O or less. The electric induction furnace smelting and tapping temperature ranges from 1,650 DEG C to 1,670 DEG C, and the degree of superheat of continuous-casting molten steel is controlled to be smaller than or equal to 30 DEG C; and deoxygenation is conducted on tundish through an external electric field slag deoxygenation device, the voltage of the external electric field ranges from 5 V to 20 V, the current ranges from 600 A to 1,000 A, and the cleanliness of the molten steel is improved; the heating temperature of a rolled steel blank is controlled within the range of 1,130 DEG C to 1,170 DEG C, the heating time ranges from 1.5 h to 2.5 h, the temperature at the beginning of rolling ranges from 1,000 DEG C to 1,100 DEG C, and the finish rolling temperature ranges from 950 DEG C to 1,050 DEG C. According to the rebar, Rel is larger than or equal to 500 MPa, Rm is larger than or equal to 630 MPa, A is larger than or equal to 15%, and anticorrosion performance of the rebar is 3 to 5 times that of a HRB500 c steel rolled rebar.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a steel bar resistant to marine weather corrosion and a production method thereof. Background technique [0002] The iron and steel industry is the basic industry for my country's economic development, and economic development cannot do without the support of heavy industries such as iron and steel. At the same time, continuously improving the development level of the iron and steel industry is also the basic premise to meet the requirements of various aspects of national economic modernization, such as machinery, construction, national defense, transportation and other industries. In recent years, my country's steel output has ranked first in the world, and it is a major steel country in the world. Steel bar is a main common material in engineering building materials at present, and is widely used in industrial and civil buildings, and its performan...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN102605255A discloses a 400MPa grade corrosion-resistant steel whose element content is: C: 0.1%-0.25%, Si: 0.5%-0.90%, Mn: 0.7%-1.5%, P: 0.04%-0.09 %, S≤0.015%, Cu: 0.3%~0.6%, Ni: 0.1%~0.4%, Cr≤0.1%, V: 0.03%~0.08%, its corrosion resistance is twice as high as that of ordinary steel bars, but its limited space

[0004] Chinese Patent Publication No. CN101709434A discloses a Cl-resistant - Corroded high-strength low-alloy steel bars, the element content of which is C: 0.08% to 0.25%, Si: 0.35% to 1.1%, Mn: 0.7% to 2.0%, Cu: 0.20% to 0.80%, Cr: 0.30% to 1.6% %, Ni: 0.20% ~ 1.0%, P: 0.05% ~ 0.10%, S≤0.010%, the balance is Fe and unavoidable impurities; or, at the same time, add microalloying elements V, Nb, Ti, B One or more; the total amount of microalloying elements is controlled at 0.01% to 0.5% (there is no example of adding titanium in the examples), the corrosion resistance of this application is still low, and the oxygen content in the steel is not controlled , there are no specific requirements on the cleanliness of molten steel, and no attention has been paid to the effect of improving the cleanliness of steel and reducing the number of inclusions on improving the corrosion resistance of steel

Images