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See Chinese contents: Q/BQB 150-2018 Q/BQB 150-2018: Rolled round billets for tubes
This Standard specifies the dimension, appearance, weight, allowable deviation, technical requirements, inspection and test, packaging, marking and inspection documents of rolled round billets for tubes. This Standard is applicable to rolled round billets for tubes manufactured by Baoshan Iron and Steel Co., Ltd., such as seamless steel tube for the purpose of manufacturing structure, seamless steel tube for the purpose of boiler and tube for the petroleum and natural gas industry, etc.
