Steel for drill pipe body suitable for arctic-alpine areas
A technology for drill pipe and pipe in alpine regions, applied in the direction of drill pipe, drill pipe, casing, etc., it can solve the problems of high ductile-brittle transition temperature, only about -30 ℃, unable to meet the operation requirements, etc., and achieve excellent low temperature toughness. Effect
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Embodiment 1
[0029] The chemical composition designed according to the invention (for example, take C 0.28%, Si 0.20%, Mn 0.68%, P 0.012%, S 0.006%, Cr 0.86%, Ni 0.78%, Mo 0.30%, Al 0.018%) requires smelting , refining, continuous casting and rolling, rolled into a 5'×9.19mm, 9.2m long tube billet, and thickened to the size required by API (wall thickness about 24mm), after heat treatment, on the tube body and the thickened end Samples were taken for tensile testing and a series of low temperature impact tests. The results show that the properties of the pipe body are as follows: when the yield strength is 875MPa, the average impact energy (sample size 7.5×10mm) is 120J, and the ductile-brittle transition temperature is lower than -100℃. The performance of the thickened end is as follows: when the yield strength is 850MPa, the impact energy (sample size 10×10mm) is an average of 160J, and the ductile-brittle transition temperature is lower than -100°C.
Embodiment 2
[0031] According to the design of the present invention (for example, take C 0.25%, Si 0.28%, Mn 0.80%, Cr 0.95%, Ni 0.95%, Mo 0.15%, Ti 0.02%, Re 0.003%, Ca 0.008)) require smelting and refining , After continuous casting and rolling, roll into 5'×9.19mm, 9.2m long tube billet, and thicken to the size required by API (wall thickness is about 24mm), after heat treatment, take samples from the tube body and the thickened end Tensile test and series low temperature impact test. The results show that the properties of the pipe body are as follows: when the yield strength is 935MPa, the average impact energy (sample size 7.5×10mm) is 100J, and the ductile-brittle transition temperature is -100℃. The performance of the thickened end is as follows: when the yield strength is 905MPa, the impact energy (sample size 10×10mm) is an average of 120J, and the ductile-brittle transition temperature is -95°C.
Embodiment 3
[0033]According to the design composition of the present invention (for example, take C 0.23%, Si 0.24%, Mn 0.78%, P 0.006%, S 0.002%, Cr 0.86%, Ni 0.90%, Mo 0.55%, V0.08%) require smelting, After refining, continuous casting and rolling, it is rolled into a 5'×9.19mm, 9.2m long tube billet, and thickened to the size required by API (wall thickness is about 24mm). After heat treatment, samples are taken from the tube body and the thickened end Tensile tests and a series of low temperature impact tests were performed. The results show that the properties of the pipe body are as follows: when the yield strength is 995MPa, the average impact energy (sample size 7.5×10mm) is 85J, and the ductile-brittle transition temperature is -75°C. The performance of the thickened end is as follows: when the yield strength is 980MPa, the impact energy (sample size 10×10mm) is 100J on average, and the ductile-brittle transition temperature is lower than -70°C.
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