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Stainless steel seamless knowledge Classification of stainless steel seamless pipe .

1 , According to the production method of classification .

( 1 ) Seamless - hot-rolled pipes, cold-rolled , cold drawn tubes, extruded tube , top tube .

( 2 ) Pipe (a) by technology - arc welded pipe, ERW pipes ( High-frequency , low frequency ) , gas pipe, stove pipe (b) by weld points - longitudinally welded pipes, spiral welded pipe .

2, According to cross-sectional shape classification .

( 1 ) Simple section steel - round pipe, square pipe , oval steel , triangular steel , hexagonal steel , diamond steel, octagonal steel, steel semi- circle, the other

( 2 ) Complex section steel - steel equilateral hexagons , five plum-shaped steel, steel double convex , double concave steel, oval -shaped steel , conical steel pipe, corrugated steel pipe, steel case , other .

3, According to the wall thickness of classification - thin-walled steel pipe, thick wall steel pipe .

4 , By use classification - with steel pipe , carbon seamless steel pipe manufacturer china steel pipe thermal equipment , machinery and industrial steel , petroleum, geological drilling steel , container steel, chemical industry steel, special-purpose steel pipes, seamless steel pipe hollow sections other , a lot of fluids used for pipeline transportation , such as transport oil, natural gas, gas, water pipes and some solid materials, and so on.

As in the perimeter of equal conditions , the largest area of ​​a circle with a circular tube can carry more fluid . In addition, the circular cross section to withstand internal or external radial pressure , the force is uniform , so the vast majority of the pipe is pipe .

However, the tube also has some limitations, such as under the conditions by plane bending , tube as good as square , rectangular tube large flexural strength, the skeleton of some farm machinery , steel and wood furniture on the popular square , rectangular tube .

Seamless steel pipe manufacturing process because of the different categories , divided into hot-rolled ( extrusion ) Seamless two seamless and cold drawn ( rolled ) . Cold drawn ( rolled ) pipe is divided into circular pipe and shaped pipe . Seamless steel tubes , but also because a number of different purposes into the following varieties :

1.GB/T8162-1999 ( structure seamless steel pipe ) . Mainly used for general structure and mechanical structure. The representative of material ( grade ) : Carbon steel , 20,45 steel ; alloy steel Q345, 20Cr, 40Cr and so on.

2.GB/T8163-1999 ( transmission fluid with seamless steel tubes ) . The main conduit for conveying fluid engineering and large equipment. Representative material (grade ) of 20, Q345 and so on.

3. GB3087-1999 ( low and medium pressure boiler seamless steel tubes ) are used in the manufacture of various structural low and medium pressure boiler superheated steam pipes , boiling water pipes and superheated steam locomotive boiler tubes, opium pipe, small pipe and brick arch effective high-quality carbon structural steel hot-rolled and cold drawn ( rolled ) seamless steel pipe. Representative material for 10,20 steel.

4. GB5310-1995 ( high-pressure boiler seamless steel tubes ) are used to manufacture high -quality carbon steel and more pressure water tube boiler heating surface with steel, alloy steel and heat-resistant stainless steel seamless pipe . Representative material for 20G, 12Cr1MoVG, 15CrMoG so on.

5. GB6479-2000 ( high pressure seamless steel pipe for chemical fertilizer equipment ) is applied to the working temperature of -40 ~ 400 ℃, working pressure of high-quality carbon steel and alloy steel 10 ~ 30Ma of chemical equipment and seamless steel pipes . Representative material for 20,16 Mn, 12CrMo, 12Cr2Mo so on.

6. GB9948-1988 ( petroleum cracking ) . Mainly for the oil refinery’s boilers , heat exchangers and pipes conveying fluid . The representative material for 20,12 CrMo, 1Cr5Mo, 1Cr19Ni11Nb so on.

7 . Geological drilling pipe (YB235-70) is for the geological department of the steel core drilling , use can be divided into the drill pipe, drill collars, core pipe, casing and precipitation tubes .

8 Diamond core drilling seamless pipe (GB3423-82) is a drill, core rods for diamond core drilling seamless steel pipe casing .

9 Oil drilling pipe (YB528-65) is used to thicken the oil drilling within or outside the thick ends of seamless steel tubes . Steel sub- threading and not two , Threading Pipe Fittings links , no threading methods and tools useful butt joint connection. 10.GB5312-1999 ( Ships Carbon and carbon -manganese steel seamless pipe ) is manufactured Class I pressure vessels piping, Ⅱ grade pressure piping , boilers, and overheating of the carbon steel seamless pipe .

Carbon steel seamless pipe wall temperature does not exceed 450 ℃, alloy steel seamless pipe wall temperature exceeds 450 ℃. Representative material for 360,410,460 steel grade and so on.

Hebei ChongSheng Special Steel Pipe Co.,Ltd.
Add: YANSHAN COUNTY,HEBEI PROVINCE,CHINA