Low-alloy steel used for oil well pipe with carbon dioxide corrosion resistance and manufacturing method thereof
A carbon dioxide and low alloy technology, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., to achieve the effect of ensuring high strength, low alloy content, and good corrosion resistance
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[0040] Table 1 Alloy steel of the present invention and the chemical composition of existing alloy steel, wt%
[0041]
[0042] Table 1 shows the chemical composition of the test steels, wherein A1-A6 are alloy steels of the present invention, and B1-B2 are reference steels, all of which are N80 oil pipes commonly used in oil fields at present. The key process parameters of the production process of control steel B1-B2 are briefly as follows: the tapping temperature at the beginning of steelmaking is about 1650°C, the starting temperature of continuous casting is about 1550°C, the piercing and rolling at about 1200°C for hot rolling of the continuous casting slab, and the final tension The temperature after diameter reduction is about 900°C. After hot rolling, the steel pipe is air-cooled to room temperature without subsequent heat treatment. In the production of steel A1-A6 of the present invention, the same process and parameters as B1-B2 are used in the front stage, and...
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