seamless steel pipe manufacturingPassed the API certification and ISO 9001-2000 certification.The seamless steel tube with the brand of"hongling" produced by the company is the most famous brand products of China.The raw materials are carbon steel and alloy steel.The products includes:the tubes for structural purpose,fluid transportation tubes,the alloy tubes,the boiler tubes,tubes for hydraulic cylinders,the tubes for petroleum well,and so on.Cindy