Our company mainly produces outer diameter 24-133mm, wall thickness 4-20mm seamless steel tubes , concurrently the major steel mills , all kinds of boiler tubes , fertilizer high-pressure pipe, spiral pipe, the application of chemical equipment , machining , piping projects .We can also be custom-made a special thick-walled tube.made of :10# 20# 35# 45# 16Mn 27SiM