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J55, K55, N80, L80-1, P110, Q125 Material API 5CT Casing & Tubing, Seamless Casing, Well Casing, OCTG Casing, Carbon Steel Casing Pipe, Casing coupling. For extracting oil and gas from wells.
API 5DP/5D Drilling, For oil and gas well drilling
GB9948-1988 is for manufacturing of furnace tubes, heat exchangers and pipelines in refineries
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