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High-Pressure Thick-Walled Thin-Walled Seamless Steel Pipes for Fluid Transportation Structures Boilers Petroleum Cracking, Find Details and Price about 45# Seamless Steel Pipe 20# Carbon Steel Pipe from High-Pressure Thick-Walled Thin-Walled Seamless Steel Pipes for Fluid Transportation Structures Boilers Petroleum Cracking - Liaocheng Mingxing Pipe Manufacturing Co., Ltd.