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High-Quality ASTM Q235 20# 45# Seamless Carbon Steel Pipe for Boiler Drill Applications Welding Processed Chinese Factories, Find Details and Price about Carbon Steel Pipe Steel Pipe from High-Quality ASTM Q235 20# 45# Seamless Carbon Steel Pipe for Boiler Drill Applications Welding Processed Chinese Factories - Tianjin Lixin Technology Co., Ltd.