EN 10219 S355J2H Square Hollow Section

 

European standard S355J2H steel pipe is a type of low-alloy high-strength structural steel pipe. The yield strength of S355J2H structural hollow sections is not less than 355 MPa, and the tensile strength ranges between 470 and 630 MPa. This provides high load-bearing capacity and resistance to deformation, ensuring that the pipe maintains good stability and safety under heavy loads, long spans, and other complex conditions.

EN 10219 S355J2H Structural Hollow Sections Specification

Grade	S355J2H
SHS (Square Hollow Sections) Sizes	20*20mm-400*400mm
Wall Thickness	0.5mm - 25mm
Length	6000-14000 mm
Type	Welded / ERW
Dimensional Tolerances	Thickness : (All sizes +/- 10%)
Packing	In bundles, Anticorrosion heat preservation, Varnish coating, Ends can be bevelled or square cut, End Capped Certification & supplementary test, Finishing & Identity Mark
Surface Protection	Black (Self Coloured uncoated), Varnish/Oil Coating, Pre-Galvanized, Hot Dip Galvanized

S355J2H Cold Formed Square Hollow Section Chemical Composition

Steel Grade	C	Si	Mn	P	S	Nb	Carbon Equivalent(CEV)
S355J2H	0.22	0.55	1.60	0.030	0.030	-	0.45

S355J2H Structural Square Hollow Section Mechanical Properties

Grade	Min. Yield Strength Reh(Mpa)		Tensile Strength Rm (MPa)		Elongation % Min.	Min. Impact Energy(J)
	Thk≤ 16 mm	Thk>16 ≤ 40 mm	Thk<3 mm	Thk≥3 mm		-20°C	0°C	20°C
S355J2H	355	345	510-680	470-630	20	27	-	-

S355J2H HS 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Production Process of S355J2H Rectangular Pipe

The production of S355J2H rectangular pipe involves stringent requirements and can be broadly divided into seven steps:

1. Raw Materials: The raw materials for S355J2H rectangular pipes include steel strip coils, welding wire, and flux. These materials must undergo rigorous physical and chemical inspections before use.
2. Butt Welding: The head and tail of the steel strip are butt-welded using single or double submerged arc welding. After forming the S355J2H rectangular pipe, automatic submerged arc welding is used for repair welding.

3. Preparation Before Forming: Before forming the S355J2H rectangular pipe, the steel strip is straightened, trimmed, planed, surface cleaned, conveyed, and edge pre-bent.

4. Pressure Control: An electric contact pressure gauge is used to control the pressure of the oil cylinders on both sides of the conveyor to ensure the smooth transportation of the steel strip.

5. Forming Method: Either external or internal roller forming is used.

6. Weld Seam Control: During welding, a seam gap control device is used to ensure that the weld seam gap meets welding requirements. The pipe diameter, edge misalignment, and weld seam gap are strictly controlled.

7. Welding: The pipe wall welding is divided into internal and external welding, both of which use American welding machines for single or double submerged arc welding, ensuring stable welding specifications.

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