The characteristics of ASTM A312 stainless steel seamless pipe

　　ASTM A312 stainless steel seamless pipe is a kind of steel strip with hollow section and without seams.

　　First, the product of the wall is thicker, it is more economical and practical, the wall thickness of the thinner, processing costs will be substantially increased it; secondly, the product process to determine its performance limitations.

　　generally low precision ASTM      A312 seamless steel pipe: uneven thickness, inner and outer surface of light low brightness, high cost of fixed length, and the inner surface pitting and black spots difficult to remove; the detection and plastic third, must be processed offline. Therefore, it has its advantages in high pressure, high strength, mechanical structure and timber.

　　The stainless steel seamless pipe type

　　The hot rolling, hot extrusion and cold drawing (rolling) stainless steel pipes are used for rolling.

　　According to the stainless steel metallographic structure, it is divided into half ferrite half martensite system, stainless steel tube, martensitic stainless steel tube, austenitic stainless steel tube, austenitic iron ferritic stainless steel tube, etc..

　　Finally, stainless steel seamless pipe specifications and appearance quality

　　A, according to GB14975-94 "stainless steel seamless steel pipe" stipulates that the length of the pipe is usually (variable length) hot-rolled steel pipe 1.5 ~ 10m, hot extrusion steel pipe is equal to and greater than 1m. Cold drawn (rolled) steel tube wall thickness of 0.5 to 1.0mm, 1 to 7m; wall thickness greater than 1.0mm, 1.5 ~ 8m.

　　The diameter of B and hot rolled (hot extruded) steel tubes ranged from 54 to 480mm, 45 to 36, and 4.5 to 45mm in thickness. The diameter of cold drawn (rolled) steel pipe is 6 to 200mm in total, 65 to 39 in thickness and 0.5 to 21mm in wall thickness.

　　C, stainless steel seamless pipe inside and outside surface shall not have cracks, folding, cracking, crack, rolling reduction, separation and scarring and defects, these defects should be completely removed (except for machining tube), after the removal of the outer wall thickness and shall not exceed the negative deviation. Other minor surface defects that do not exceed the allowed deviation shall not be removed.

　　D, straight allowing depth. Hot rolled, hot extruded steel pipe, diameter less than and equal to 140mm is not greater than the nominal wall thickness of 5%, the maximum depth is not greater than 0.5mm; cold drawn (rolled) steel pipe is not greater than 4% of the nominal wall thickness, the maximum depth is not greater than 0.3mm.

　　E, stainless steel seamless pipe at both ends should be cut into the right angle, and remove burrs.

　　In terms of materials, ASTM A312 stainless steel seamless pipe is typically made from austenitic, ferritic or duplex stainless steel, which gives it excellent corrosion resistance and mechanical strength.