Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating Seamless Pipe For Transport Liquid is made of carbon steel.Its smooth,clean inside surface helps to prevent valve and cylinder damage in hydraulic,diesel fuel injection,lubrication,heating coil,air conditioner,and other high pressure applications,use with standard fittings for best performance.1.Q: Can I get samples before order ? A: Yes, of course. Usually our samples are free. we can produce by your samples or technical drawings. 2.Q:How do you make our business long-term and good relationship? A:We keep good quality and competitive price to ensure our customers benefit ; We respect every customer as our friend and we sincerely do business and make friends with them.No matter where they come from. 3.Q:what is your delivery time ? A: Our delivery time is about one week, timing according to the number of customers.Cold Drawn Seamless as implied is made by cold drawing a larger mother seamless pipe, which is generally manufactured through a HFS process. In the Cold Drawn Seamless process, the mother pipe is pulled through a die & plug in cold without any heating. Because of the tool on outside and inside the surface and tolerances are better in Cold Drawn Seamless. Cold drawn seamless steel pipe is used for the mechanical structure, hydraulic equipment ,which is have precision size ,good surface finish. It can greatly reduce mechanical processing hour and improve material utilization, and to improve the quality of products. Tubes designated for hydraulic are seamless cold drawn steel tubes that are used in pressure distributions and circuits, in hydraulically operated equipment. The speed and pressure of the medium are significantly changing and these devices have characteristic pressure surges on the inner surface of tubes.