S355j2h SSAW Pipe

 

S355J2H spiral welded pipe is a European standard low-alloy high-strength structural steel pipe, commonly used in construction, bridges, ships, vehicles, and other structures. Delivery conditions include normalized rolling, rolling, and thermomechanical rolling.

S355J2H SSAW Pipe Specification

Size	OD:	219-3220mm
	Thickness:	4-18mm
	Length:	6m/9m/12m or other size according to the contract
Steel Material	Q195, Q215, Q235, Q345 (Chinese Standard. Other Material Can Be Ordered)
Standard	GB/SY/DIN/ASTM/ASME/ASNI/API
Usage	Used For Gas, Petroleum, Water ,Oil, Structure And Sewage
Ends	Plain or Beveled (Can be Protected By Plastic Pipe Cap)
Surface	Bared Or Paint With Oil, Bitumen,1-3 layer PE (Outside Or Inside Anti-Corrosion Treatment Can Supply)
Inspection	With Hydraulic Testing, Eddy Current , Infrared or X-Ray Test, Also With Chemical And Physical Property Inspect
Technique	Hot Rolled and SAW/ERW/SSAW
Type	Welded/ SSAW
Section Shape	Round
Package	In Bulk, Or Other Method According To The Contract
Date of Delivery	Less Than 30 Days, According To The Quantity
Port of Shipment	Tianjin, Shanghai, Ningbo

S355J2H Structural Welded Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Causes of Cracks in Spiral Welded Pipes:

1. Insufficient Deformation of Steel Strip: Cracks caused by severe under-deformation of the steel strip. In the production process, insufficient pressure from the inner pressure roller can lead to inadequate deformation of the steel strip, potentially causing cracks.

2. Uneven Deformation of Steel Strip: Cracks resulting from uneven deformation of the steel strip.

3. Weld Pad Roller: Cracks caused by the weld pad roller. During production, the weld pad roller significantly affects the forming and welding quality. If the weld pad roller is raised too high or has an inappropriate shape, it may cause cracks.

4. Raw Material Defects: Hard bends and uneven local hardness in the raw material can also lead to cracks, often accompanied by misalignment.

5. Stress Changes During Forming: Cracks due to changes in stress during the forming process, such as when a forming roller is damaged or missing, altering the stress state of the steel strip during deformation.

6. Variations in Steel Strip Working Width: Cracks can occur due to changes in the working width of the steel strip, an excessive rear axle angle, or an overly tight forming seam.

7. Welding Conditions: Since both internal and external weld seams of spiral submerged arc welded pipes are formed while the pipe is moving in a spiral motion, the internal weld typically uses "downhill" welding. The molten pool of the internal weld cannot solidify in a horizontal position and can only solidify on the inclined inner surface. Coupled with the fast welding speed, the liquid metal in the weld pool must crystallize on the moving pipe, deteriorating the welding conditions and potentially causing cracks.

8. External Weld Cracks: These are specific defects in the production of thick-walled spiral submerged arc welded pipes. The main cause is improper forming coefficients, often due to inappropriate external weld groove shapes and widths. The groove has a significant impact on external weld cracks.

9. Material Properties: The chemical composition of the steel, hardenability, and hydrogen content in the steel are also important factors leading to cold cracks during welding.

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