1. According to the production method of classification :
( 1 ) seamless - cold drawn tubes, extruded tubes, cold-rolled tubes .
( 2 ) welded : (a) classification by technology - gas pipes , arc welded pipe, ERW pipes ( high-frequency , low frequency ) .
(b) the weld points - longitudinally welded pipes, spiral welded pipe .
2, According to cross-sectional shape classification :
( 1 ) round steel ;
( 2 ) rectangular tube .
4 , grouped by usage:
( 1 ) civilian control of the sub pipe, rectangular pipe, flower tube , generally used for decorative aspects , building, structure , etc. ;
( 2 ) industrial Pipe : Industrial piping steel , general steel piping ( water pipe ) , the mechanical structure / fluid pipes, boiler heat exchanger tubes , pipes and other food hygiene . Generally used in industrial fields such as: petrochemical, paper , nuclear, food, beverage, pharmaceutical and other industries require a higher dielectric fluid conduit . 5 , Material Category: Common 201 stainless steel pipe, 202 stainless steel, 301 stainless steel, 304 stainless steel , 314L stainless steel, 316 stainless steel , 316L stainless steel, 430 stainless steel, 440 stainless steel tubes.
II, seamless steel pipe stainless steel seamless pipe is a hollow cross section , no seams around the long bar of steel .
1. Seamless steel pipe manufacturing technology and processes : smelting > Ingot > Rolling > Sawing > Skinning > Piercing > Annealing > pickling > on the gray > drawing > cutting head > acid > storage.
2. seamless steel characteristics : From the above process is not difficult to see that :
First, the thicker the wall thickness of the product , it is more economical and practical , the thinner wall thickness, it will be a substantial increase in processing costs ;
Secondly , the product the process determines its limitations , generally seamless precision low : uneven wall thickness, the tube looks low brightness , high cost of length , as well as the appearance of pitting , and is difficult to remove the black spots ;
Third , it detects and shaping must be offline . Therefore , it reflects its superiority in high-pressure , high- strength, mechanical structural material respects .
III, Welded steel pipe welded steel pipe for short , is made of welded steel with steel or steel through the unit and mold curled shape.
1 steel coil > Slitting > Forming > Welding > Sensor bright heat treatment > internal and external weld processing > shaping > Sizing > Eddy Current Testing > laser diameter > acid > storage
2 welded steel characteristics : From the above process we easy to see :
First , the product is a continuous line of production , the thicker wall thickness , welding equipment investment units and the greater , the more it does not have the economic and practical . Thinner wall thickness , its input-output ratio will drop accordingly ; followed by the product of the process to determine its strengths and weaknesses, general welding steel high- precision , uniform thickness, the tube looks bright high ( steel pipe surface level decision surface brightness ) can be any length . Therefore , it reflects its economy and aesthetics in high-precision , low-pressure fluid applications.
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