1, according to the production method of classification:
(1) seamless tube, cold drawn tube, extrusion tube, cold rolling tube.
(2) welded pipe:
(a) according to the process classification, gas shielded welding pipe, arc welding, resistance welding pipe (high frequency and low frequency).
2, according to the cross section shape classification: (1) the circular steel tube; (2) rectangular tube.
3, according to the classification of wall thickness, thin-walled steel pipe, thick-walled steel pipe
4, classification: (1) according to the use of civil pipe runs round tubes, rectangular tubes, pipe, generally used to decorate, building, structure, etc;
(2) industry pipe: steel tube for piping, general steel pipe (drinking water), the mechanical structure for piping/fluid conveying pipe, boiler heat exchange tube, food hygiene, etc. Commonly used in industrial fields such as petroleum chemical industry, papermaking, nuclear energy, food, beverage, pharmaceutical and other industries of fluid pipeline is required to be higher.
Second, the seamless steel tube
Stainless steel seamless steel tube is a hollow section, no seams of strip steel.
1. Seamless steel tube manufacturing technology and process:
Smelting ingot > > > of steel rolling cutting > > > peel > perforation annealing pickling cold drawn on ash > > > crop > > acid into the Treasury
2. The characteristics of the seamless steel pipe:
We it is not hard to see from the above process: first, the wall thickness of the product is thick, it is more economical and practical, the thinner wall thickness, its processing cost will rise significantly; Secondly, the process of the product decided to its limitations, generally low precision seamless steel pipe: low surface brightness, uneven thickness, tube length cost is high, and the appearance is not easy to remove and pitting, black spots inside; Thirdly, its detection and plastic must offline processing. As a result, it in high pressure and high strength material, mechanical structure embodies its superiority.
Third, welded steel pipe
Welded steel pipe or welded pipe, it is to use steel plate or steel strip after crimp units and dies made of welded steel pipe.
1. Steel > > > article points of molding dissolves > induction heat treatment > light inside and outside weld treatment > > eddy current testing of plastic > diameter > laser caliper > > acid into the Treasury
2. The characteristics of the welded steel pipe:
We it is not hard to see from the above process: first, the product is continuous online production, wall thickness is thicker, the unit and dissolves equipment investment, the less it has economical and practical. The thinner wall thickness, the input-output ratio will be reduced; Then determine its advantages and disadvantages of the product process, general high precision welded steel pipe, wall thickness uniformity, high brightness tube appearance (level determines the surface of the steel plate of steel tube surface brightness), can be arbitrary length. As a result, its application in high precision, low pressure fluid embodies its economy and aesthetics.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)
