Seamless steel tube for ultra supercritical boiler and manufacturing method thereof
A technology for ultra-supercritical boilers and seamless steel pipes, applied in the direction of manufacturing tools, furnaces, furnace types, etc., can solve the problems of insufficient durable strength and cannot fully meet the actual working conditions of ultra-supercritical boilers, and achieve good high-temperature corrosion resistance Performance, performance improvement, effect of improving grain boundary structure
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Example Embodiment
[0039] Seamless steel pipe embodiment one
[0040] The component mass percentage ratio of the embodiment of the seamless steel pipe for superheater and reheater of this ultra-supercritical boiler is:
[0041] Cr 25.03 Ni 18.05 Si 0.18 Mn 0.85
[0042] P 0.020 S 0.001 C 0.054 N 0.22
[0043] La 0.01 Nb+Ta 0.45 (Nb and Ta account for 99.88% and 0.12% respectively), the rest is Fe and inevitable impurities, of which O is 0.006%.
[0044] The microstructure of this embodiment after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7. The external dimensions are generally 3000~12000mm long, 5~500mm outer diameter, and 0.5~30mm wall thickness. The length of this embodiment is 4000mm, the outer diameter is φ106mm, and the wall thickness is 12mm.
Example Embodiment
[0045] Second embodiment of seamless steel pipe
[0046] The component mass percentage ratio of the embodiment of the seamless steel pipe for superheater and reheater of this ultra-supercritical boiler is:
[0047] Cr 25.55 Ni 17.61 Si 0.23 Mn 1.06
[0048] P 0.015 S 0.001 C 0.048 N 0.25
[0049] La 0.04 Nb+Ta 0.46 (Nb and Ta account for 99.95% and 0.05% respectively)
[0050] The rest is Fe and inevitable impurities, of which O is 0.005%.
[0051] The microstructure of this embodiment after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7. The external dimensions are generally 3000~12000mm long, 5~500mm outer diameter, and 0.5~30mm wall thickness. The size of this embodiment is 5000 mm in length, 57 mm in outer diameter, and 8 mm in wall thickness.
Example Embodiment
[0052] Seamless steel pipe embodiment three
[0053] The component mass percentage ratio of the embodiment of the seamless steel pipe for superheater and reheater of this ultra-supercritical boiler is:
[0054] Cr 25.26 Ni 17.94 Si 0.25 Mn 0.94
[0055] P 0.016 S 0.001 C 0.051 N 0.24
[0056] La 4.26 Nb+Ta 0.42 (Nb and Ta account for 99.93% and 0.07% respectively)
[0057] The rest is Fe and inevitable impurities, of which O is 0.004%.
[0058] The microstructure of this embodiment after solution treatment is austenite + finely dispersed second phase, and the grain size is 4-7. The external dimensions are generally 3000~12000mm long, 5~500mm outer diameter, and 0.5~30mm wall thickness. The size of this embodiment is 12000mm, the outer diameter is φ17mm, and the wall thickness is 2.45mm.
[0059] Manufacturing method embodiment one
[0060] This embodiment manufactures the first embodiment of seamless steel pipe, which includes the following sequential steps:
[0061] 1. Smelting
[0062] A...
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