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See Chinese contents: Q/BQB 267-2020 Q/BQB 267-2020: High strength and toughness casing
This Standard specifies the delivery technical conditions for the high strength and toughness casing manufactured by Baoshan Iron and Steel Co., Ltd. This Standard is applicable to seamless casing (hereinafter referred to as casing) used in the oil and gas production environment of ultra-deep, ultra-high pressure and complex strata rheology in oil and gas exploration of the petroleum and natural gas industry.
