The Difference Between Seamless Steel Pipe And Welded Steel Pipe

1, the appearance of different: seamless steel pipe surface without seams, welded steel pipe surface seams

2, the pressure is different: welded steel pipe in about 10 Mpa, while the seamless steel pipe pressure is higher.

3, different uses: seamless steel pipe used as oil geological drilling pipe, aviation with high-precision structural steel pipe; welded steel pipe can be used as water and gas pipe, etc.

4, different classifications: seamless tube hot-rolled tube, cold-rolled tube, top tube, etc. Welded steel pipe can be divided into arc welded tube, gas welded tube, Bundy tube, etc.

5, the process is different: welded steel pipe needs to be rolled and welded, and seamless steel pipe is rolled in a single molding

What is the material of 20 seamless steel pipe?

20 seamless pipe material for 20 steel, 20 seamless pipe material for: high quality carbon structural steel.

20 seamless pipe strength is slightly higher than 15 steel, rarely quenched, no temper brittleness. Cold deformation plasticity is high, generally for bending, calendering, edge bending and hammering arch and other processing, arc welding and contact welding welding performance is good, gas welding when the thickness is small, the shape requirements of strict or complex shape of the parts on the easy to crack. Cutting processability of cold drawn or normalized state is better than the annealed state. Generally used in the manufacture of not much force and high toughness requirements.

Hot rolled seamless pipe due to processing and production of high temperature, so its deformation is larger, can withstand greater deformation pressure, for the accuracy of the size of the relatively low requirements, can effectively avoid the problem of plate shape.

According to different uses and materials, hot rolled seamless pipe is divided into many types, such as alloy pipe, mainly used in petroleum, refining, chemical and other fields; high-pressure boiler tube, mainly used for heat pipe, steam pipe and other high-pressure boiler related supporting pipeline manufacturing; high-pressure fertilizer pipe, the pipe used in ultra-low temperature (-40 degrees) or ultra-high temperature (400 degrees) working environment and high-pressure environment.

Hot rolled seamless pipe classification, each sub-category corresponds to the use are not the same, so each also has different specifications, as well as follow the different implementation standards. Below we list the most commonly used ten steel pipe standards and specifications are as follows.

1.Alloy Pipe

Execution standards: GB5310-2008, GB6479-2000, GB9948-2006, DIN17175-79, ASTM SA335, ASTM SA213, JISG3467-88, JSG3458-88

Specification:$8-1240*1-200

2.Stainless steel pipe

Standard:GB/T14975-2002,GB/T14976-2002GB13296-2007,ASTM A213,ASTM A269,ASTMA312,JIS G3459,DIN 17458

Specification:$6-630*0.5-60

3.Low temperature pipe

Standard:GB/T18984-2003,ASTM A333

Specification:∮8-1240*1-200

4.High pressure boiler tube

Standard:GB5310-1995,ASTM SA106,ASTMSA210,DIN17175-79,GB6479-2000

Specification:φ8-1240*1-200

5.Petroleum cracking pipe

Standard:GB9948-2013

Specification:$8-630*1-60

6.Low and medium pressure boiler tube

Standard:GB3087-2008

Specification:$8-1240*1-200

7.Fluid transportation pipe

Standard:GB/T8163-2008,ASTM A106,ASTMA53

Specification:∮8-1240*1-200

8.General structural pipe

Standard:GB/T8162-2008,GB/T17396-1998,ASTM A53

Specification:∮8-1240*1-200

9.Petroleum casing

Standard:APISPEC 5CT, ISO11960

Specification:60.23-508.00*4.24-16.13

10.LSAW steel pipe

Standard:GB/T13793-1992,GB3091-2001

Specification:∮32-630*1-30