What's the differences with seamless steel tubes and welded steel tubes?
Publish Time: 2017-09-21 Origin: Site
I will show you the differences clearly in the form as below:
| No. | Description of steel pipes | Shape of Steel Pipes | Craft | Material | Standard | Application |
| 1 | Welded Steel Pipes | Round Steel Pipes and Has Seam on it. | Welding Strip Steel or Steel Plate By the different welding methods. There are continous furnace welding tubes, electric resistance welding(ERW). Electric-arc-welded pipes. | Q195-Q235，SS400，ST37-2，STK400，STK500，16MN，Q235A，Q235B，16Mn，20#，Q345，L245，L290，X42，X46，X60，X80，0Cr13，1Cr17，00Cr19Ni11，1Cr18Ni9，0Cr18Ni11Nb | GB/T3091-1993 (low pressure flow of galvanized welded tubes) GB/T3092-1993 (low pressure flow of galvanized welded tubes) GB/T14291-1992（Welding pipes for mineral fluids) GB/T14980-1994（low pressure flow of galvanized welded big diameter tubes) | Widely used low pressure flow of water,oven gas,oil and steam;Computer desk and table legs and other furniture and so on. |
| 2 | Seamless Steel Pipes | Round Seamless Steel Pipes none seam. | Punching a hole in the steel rod or steel bar. And do the further production by cold drawn or cold rolled machine or hot rolled machine. | High Quality Low Carbon Steel Pipes Such as SAE1010,SAE1020,SAE1040 ;16Mn,50MnV;40Cr、30CrMnSi、45Mn2、40MnB | GB3639, DIN2391.(EN10305-1). A519 and so on | For Automobile parts and Motorcycle parts.Gas Spring tubes and oil system pipes and so on. |
Show the pictures as below:
Different production craft(Flow Chat) :
Like twin girls and boys, although seamless steel pipes and welded steel pipes look same sometimes under special treatment. But they have different characters and quality .So they have different values and applications.
The RAYMOND Steel Pipes is mainly carbon and alloy seamless steel tubes. The regular scope of outside diameter is 6mm to 65mm. The regular scope of thickness of steel tubes is 0.8mm to 13mm. They are widely used in gas spring, shock absorber of motorcycles and automobiles, oil piping kits and so on. RAY Steel Pipes focus on producing more precision and smooth steel tubes.
Compare to other factories in China, we have two crafts of steel pipes- cold drawing and cold rolling. And we can control the quality from the raw material to end steel pipes.