Stainless steel seamless steel pipe is a long steel material with a hollow section and no seams around it.
Features of stainless steel seamless pipes:
First, the thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the processing cost will increase significantly. Secondly, the process of the product determines its limited performance. Generally, Seamless steel pipes have low precision: uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and pitting and black spots on the inside and outside that are difficult to remove; thirdly, its detection and shaping must be processed offline. Therefore, it reflects its superiority in terms of high pressure, high strength, and mechanical structural materials.
Types of stainless steel pipes: The rolling methods are divided into hot rolling, hot extrusion and cold drawn (rolled) stainless steel pipes. According to the different metallographic structures of stainless steel, it can be divided into semi-ferritic and semi-martensitic stainless steel pipes, martensitic stainless steel pipes, austenitic stainless steel pipes, austenitic-ferritic iron stainless steel pipes, etc. Stainless steel pipe specifications and appearance quality: A. According to the provisions of GB14975-94 "Stainless Steel Seamless Steel Pipe", the usual length of steel pipes (indeterminate length) is 1.5-10m for hot-rolled steel pipes and equal to or greater than 1m for hot-extruded steel pipes. Cold drawn (rolled) steel pipes with a wall thickness of 0.5 to 1.0mm, 1.0 to 7m; those with a wall thickness greater than 1.0mm, 1.5 to 8m. B. There are 45 types of hot-rolled (hot extruded) steel pipes with diameters ranging from 54 to 480mm; and 36 types with wall thicknesses ranging from 4.5 to 45mm. There are 65 types of cold-drawn (rolled) steel pipes with diameters ranging from 6 to 200mm; and 39 types of wall thickness ranging from 0.5 to 21mm. C. There must be no cracks, folds, cracks, cracks, folds, separation layers and scarring defects on the inner and outer surfaces of the steel pipe. These defects should be completely removed (except for pipes for mechanical processing). After removal, the wall thickness and appearance must not be changed. diameter exceeds the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation do not need to be removed. D. Allowable depth of straight track. Hot-rolled and hot-extruded steel pipes with a diameter less than and equal to 140mm shall not exceed 5% of the nominal wall thickness, and the maximum depth shall not exceed 0.5mm; cold-drawn (rolled) steel pipes shall not exceed 4% of the nominal wall thickness, and the maximum depth shall not exceed 0.3 mm. E. Both ends of the steel pipe should be cut at right angles and burrs should be removed.
DMH UNITED STEEL INDUSTRY CO.,LTD could export ASTM A312 TP321 stainless steel seamless pipe - America standard stainless steel pipe. Because of our professionality, good quality and more competitive in the market, the annual quantity we exported is around 6,000tons. Welcome to visit our company, and you can see our mills production scale and testing equipment. We will provide the best quality, competitive price with reliable stainless steel pipe for all of our customers.
Standard:GB/T14976-2002；GB13296-2007； ASTM A312， ASTM A213，ASTM A269，ASTM A249，ASTM A789，ASTM A790，EN10216-5，EN10217-7，DIN17457，DIN17458，EN ISO 1127 and JIS,etc...
Chemical composition: C≤0.08 Mn≤2 P≤0.04 S≤0.03 Si≤0.75 Ni:9~13 Cr:17~20 321 stainless steel seamless pipe: mainly used to make high pressure steam boiler pipeline and other high-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant steel seamless pipe, these boiler tubes are often working under high temperature and high pressure, the tube in the role of high temperature flue gas and water vapor will also occur under the oxidation and corrosion, so the steel pipe has high lasting strength, high oxidation resistance, and owns good tissue stability, hydraulic support tube.
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