Production process of high-chromium corrosion-resistant sucker rod

Abstract

The invention discloses a production process of a high-chromium corrosion-resistant sucker rod. The production process comprises the following steps: 1) designing components in percentage by mass: 0.09 to 0.11 percent of Cr with a brand number of 50, 0.09 to 0.11 percent of C, 0.25 to 0.35 percent of Si, 0.35 to 0.45 percent of Mn, 0.005 percent of P, 0.005 percent of S, 4.9 to 5.1 percent of Cr, 0.09 to 0.11 percent of Mo, 0.025 to 0.035 percent of Al, 0.025 to 0.035 percent of Ti and the balance of iron and impurities; 2) a process path: BOF-LF-CC; (3) ferrochrome alloying; (4) converter end point control is conducted, specifically, the converter is subjected to high-drawing and re-blowing operation, the one-time turning-down temperature ranges from 1600 DEG C to 1640 DEG C, one-time turning-down carbon ranges from 0.10% to 0.20%, ferrochrome is added for re-blowing temperature increasing, the tapping temperature ranges from 1670 DEG C to 1700 DEG C, and tapping carbon ranges from 0.04% to 0.06%; and (5) after the furnace, calcium carbide is adopted for pre-deoxidation by 2 kg / t, aluminum iron is adopted for final deoxidation, 120 kg of calcium carbide and 60 kg of AlFe are added when the end point carbon content% ranges from 0.03% to 0.04%, 100 kg of calcium carbide and 50 kg of AlFe are added when the end point carbon content% ranges from 0.04% to 0.05%, and 80 kg of calcium carbide and 40 kg of AlFe are added when the end point carbon content% ranges from 0.05% to 0.06%.

Description

technical field [0001] The invention relates to a production process of a high-chromium corrosion-resistant sucker rod. Background technique [0002] The main form of sucker rod corrosion is cavitation. Bubbles form near the surface of the sucker rod when the vapor pressure of the liquid is higher than its pressure against the surface of the sucker rod. In addition, the gas dissolved in the liquid may also precipitate out and generate bubbles. Subsequently, when the bubbles flow to a place where the pressure of the bubbles is lower than the pressure of the liquid, they will be broken, and a large impact force will be generated at the moment of breaking. The surface of the sucker rod is repeatedly subjected to this instantaneous impact force for many times, and the surface material will fall off due to fatigue. Therefore, small pits will appear on the surface, and even develop into a honeycomb shape. In severe cases, large flakes will be formed on the surface. The pits can...

AI Technical Summary

Problems solved by technology

As the oilfield enters the middle and late stage of development, as the water content of the produced fluid increases, various ions are enriched around the sucker rod under working conditions. When the sucker rod contacts some corrosive ions or gaseous media, it will occur Corrosion, which in turn has a high potential for corrosion fatigue failure

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