This Standard specifies the technical conditions for the delivery of heat- resistant casings of Baoshan Iron and Steel Co., Ltd.. This Standard is applicable to the seamless casing (hereinafter known as casing for short) in heavy oil recovery of petroleum and natural gas industries and in other high temperature environments. The casing steel grades in this Standard are. BG80H, BG90H, BG100H, BG110H, BG110H-3Cr, BG130H-3Cr. The casing specified in this Standard contains three product specification levels (PSL1, PSL2, PSL3).
