As a professional carbon spiral steel pipe manufacturer with many years of history the annual output of spiral steel pipe is more than **0, ***0 tons. Our plant has *3 production lines to produce spiral double-faced submerged-arc welded pipes. The outer diameter of pipe is from **9mm to ***0mm and wall thickness is from 6mm to *8 mm. Our products comply with the standard of SY/T********0, GB/T***1.*****7 and API SPEC 5L. The material can be Q**5A, B, *6Manganese and X**-X*0 grade plate. The pipes have been widely used in long-distance transmitting of natural gas and petroleum, chemical industry, power, heat power and water source etc We passed ISO***1 Quality System Certification in ***0, passed the API 5L Qualification of American Petroleum Institute in ***6. Our goods accept the third party inspection such as GL, SGS etc. For years our goods have been exported to many countries such as Portugal, Argentina, USA, Canada, Iran, UAE, South Africa, France, etc. We ensure to supply good product and service for all our customersa with competitive price. Cassiel Lu