Low-cost high-corrosion-resistance steel bar and production method thereof

Abstract

The invention discloses a low-cost high-corrosion-resistance steel bar and a production method thereof. The steel bar comprises the following chemical components: less than or equal to 0.05% of C, 0.005-0.05% of N, less than or equal to 1% of Si, less than or equal to 1% of Mn, 7.5-10% of Cr, more than 0 and less than or equal to 1% of Mo, 0.01-0.2% of V, 0.02-0.1% of C + N, 1-2% of Si + Mn, 8.5-11% of Cr + Mo + V and the balance of Fe; and the equivalence ratio of chromium to nickel is 7-9. In the production method, ferrochrome is added in two batches during steelmaking; the first batch of ferrochrome is added in converter smelting; the second batch of ferrochrome is added in LF furnace refining, and the ferrochrome accounts for 1 / 2-2 / 3 of the total amount; and the temperature of a cooling bed on the steel bar is greater than or equal to 840 DEG C, and the cooling speed is controlled to be less than or equal to 1.5 DEG C / s. The steel bar is excellent in corrosion resistance and mechanical property, low in cost and suitable for use requirements of ocean engineering.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a low-cost high-corrosion-resistant steel bar and a production method of the low-cost high-corrosion-resistant steel bar. Background technique [0002] Reinforced concrete structure is the most widely used structural form in infrastructure construction. The theoretical service life of reinforced concrete structure is relatively long. The life span is far from the design life. [0003] For this reason, there are many commonly used solutions for improving the corrosion resistance of steel bars, such as stainless steel bars, epoxy resin-coated bars, and galvanized bars. However, in addition to the corrosion resistance, the mechanical properties, welding properties, and manufacturing costs of steel bars are also important aspects that affect the actual production and application of steel bars. [0004] For example, stainless steel bars have excellent corrosion resistance. However,...

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Problems solved by technology

[0004] For example, stainless steel bars have excellent corrosion resistance. However, due to the addition of a large amount of alloying elements such as Cr, Ni, and Mo for their corrosion resistance, their raw material costs and production costs are doubled compared with ordinary steel bars, and the price It is too expensive to be widely used, and it does not meet the social needs of energy saving and consumption reduction; moreover, the welding performance of stainless steel bars is very poor, it is not resistant to pitting corrosion, and macro cell corrosion is formed when it is lapped with ordinary steel bars

[0005] For another example, for epoxy resin coated steel bars and galvanized steel bars, on the one hand, the production process is complicated, which does not meet the environmental protection requirements of energy saving and emission reduction; It is easy to be damaged during transportation, and this kind of steel bars are not suitable for on-site mechanical processing

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