High strength weathering steel and producing method thereof

Abstract

The invention relates to a high-intensity anti-atmosphere corrosion steel and a production method thereof and belongs to the field of metallurgy. The technical problem needed to be solved by the invention is to provide a V-Ti-N-Nb micro-alloy high-intensity anti-atmosphere corrosion steel which has an easily-controlled hot rolling technique and has an obvious yield point. The weight percentages of the chemical components of the high-intensity anti-atmosphere corrosion steel of the invention are: equal to or less than 0.12 percent of C, equal to or less than 0.75 percent of Si, equal to or less than 1.50 percent of Mn, equal to or less than 0.025 percent of P, equal to or less than 0.008 percent of S, 0.30 to 1.25 percent of Cr, 0.12 to 0.65 percent of Ni, 0.20 to 0.55 percent of Cu, 0.006 to 0.02 percent of Ti, 0.04 to 0.09 percent of V, 0.01 to 0.02 percent of N, 0.015 to 0.03 percent of Nb and the rest is Fe and unavoidable impurities. The high-intensity anti-atmosphere corrosion steel of the invention can be used for producing the mechanical devices and parts that need to be exposed in the air.

Description

technical field [0001] The invention relates to high-strength atmospheric corrosion-resistant steel and a production method thereof, belonging to the field of metallurgy. Background technique [0002] The corrosion resistance of atmospheric corrosion-resistant steel is different from that of corrosion-resistant alloys. It is protected by the rust layer formed on the surface of ordinary carbon steel. Copper, phosphorus, chromium, and nickel have always been recognized as the key to improving the atmospheric corrosion resistance of steel. Effective elements, the most representative steel grades are Cu-P-Cr-Ni series with high weather resistance and Cu-Cr-Ni series for welded structures. Among them, Table 1 shows the general composition requirements of Cu-Cr-Ni series atmospheric corrosion resistant steel. [0003] Table 1 chemical composition range (weight percent) [0004] [0005] At present, "structure strengthening" technologies such as acicular ferrite and ultra-low ...

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Problems solved by technology

[0006] The Nb-based microalloying route focuses on structural strengthening, and has disadvantages such as heavy hot rolling load, difficult hot rolling process control, and no obvious yield point phenomenon in the stress-strain curve of the tensile test of the steel.

[0007] So far, there is no report on V-Ti-N-Nb micro-alloyed high-strength atmospheric corrosion-resistant steel with simple hot-rolling process control and obvious yield point

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