Low-alloy steel resistant to carbon dioxide corrosion
A low-alloy steel, carbon dioxide technology, applied in earth-moving drilling, drilling equipment, drill pipes, etc., can solve the problems of poor corrosion resistance, oil field economic losses, easy failure, etc., and achieve simple manufacturing process, cost saving, and simple manufacturing process. Effect
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[0024] The characteristics of the present invention are described in more detail below through the examples.
[0025] Table 1 is the chemical composition of the steels of the examples and comparative examples of the present invention. Among them, A1-A6 are alloy steels of the present invention, and B1-B2 are comparative steel types, all of which are J55 steel pipes currently commonly used in oil fields.
[0026] Table 2 shows the mechanical properties and corrosion properties of the tested steels.
[0027] Table 1
[0028]
[0029] Table 2
[0030]
[0031] Note: The test condition is Na + +K + : 19673mg / L, HCO 3 - : 85.4mg / L, Cl - : 31700.8mg / L, SO 4 2- : 95.1mg / L, Ca 2+ : 1306.6mg / L, Mg 2+ : 210.2mg / L, PH=6.0, test temperature: 60℃, CO 2 Partial pressure: 1.5Mpa, flow rate: 1.0m / s.
[0032] It can be seen from the data in Table 2 that the steel of the present invention has certain carbon dioxide corrosion resistance. figure 1 It is the test surface morpho...
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