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Tianjin Brisk Metalwork Co.,Ltd is one of the manufacturers of EN 10219 S355JR STRUCTUAL STEEL TUBE in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.

PRODUCTION

EN 10219 S355JR RECTANGULAR HOLLOW SECTION

Chemical Composition

Steel Grade	Chemical Composition %
Steel Grade	C	Si	Mn	P	S	N	Al
EN 10219 S355JR	≤0.22	≤0.55	≤1.60	≤0.035	≤0.035	≤0.009	≥0.020

Low carbon design (C≤0.22%) ensures good weldability and toughness.
Manganese (Mn) increases strength, refines grains, and improves hot workability.
Aluminum (Al) acts as a deoxidizer and refines grains, ensuring impact toughness.
Phosphorus and sulfur are strictly controlled to reduce the risk of cold/heat brittleness.
The calculation method for CEV is as follows: CEV = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15

Mechanical Properties

Steel Grade

Thickness(mm)

Yield Strength(Mpa)

Tensile Strength(Mpa)

Elongation %

20 ℃ Impact energy

EN 10219 S355JR

≤16

≥355

470–630

≥22

≥27

16–40

≥345

470–630

≥22

≥27

JR: At 20°C room temperature impact, the V-notch impact energy is ≥27J, ensuring resistance to brittle fracture at room temperature.

Material Advantages

High Strength: Yield strength ≥355MPa, about 120MPa higher than ordinary structural steel (such as S235), allowing for thinner sections and reduced structural weight.
Excellent Toughness: Stable under impact at room temperature, with strong resistance to dynamic loads and earthquakes.
Good Weldability: Low carbon, low CEV (carbon equivalent ≈0.40–0.45), compatible with various welding processes, and stable joint performance.
Good Workability: Good performance in cold bending, cutting, and forming, suitable for manufacturing complex hollow components.
High Cost-Performance Ratio: Significant strength improvement with limited cost increase, providing outstanding overall benefits.

Building Steel Structures: Columns, beams, and trusses for high-rise and super high-rise buildings; large-span stadium and factory frameworks; curtain wall support structures.
Bridge Engineering: Main beams, piers, trusses, and support systems for highway and railway bridges.
Mechanical Equipment: Heavy machinery frames, equipment bases, crane arms, and structural components of construction machinery.
Energy Infrastructure: Wind turbine towers, photovoltaic supports, transmission towers, and oil & gas pipeline support structures.
Transportation: Vehicle chassis, container frames, ship superstructures, and hull structures.
Others: Load-bearing structures for storage racks, industrial platforms, and municipal facilities.

Dimensional Tolerance

Characteristic	Circular hollow sections	Square and rectangular hollow sections		Elliptical hollow sections
		Side length mm	Tolerance
Outside Dimensions (D, B, H)	±1 % with a minimum of ± 0.5 mm and a maximum of ± 10 mm	H, B ＜ 100	±1 % with a minimum of ± 0.5 mm	±1 % with a minimum of ± 0.5 mm
		100 ≤ H, B ≤ 200	±0.8 %
		H, B ＞ 200	±0.6 %
Thickness (T)	For D ≤ 406.4 mm: T ≤ 5 mm ± 10%; T ＞ 5mm ±0.5 mm;	T ≤ 5 mm ± 10%		T ≤ 5 mm ± 10%
	For D ＞ 406.4 mm: ±10 % with a maximum of ±2 mm	T ＞ 5mm ±0.5 mm		T ＞ 5mm ±0.5 mm
Out-of-roundness (O)	2 % for hollow sections having a diameter to thickness ratio not exceeding 100	-		-
Concavity/Convexity (x1, x2)	-	max 0.8 % with a minimum of mm		-
Squareness of side (θ)	-	90° ± 1°		-
External corner profile (C1, C2 or R)	-	See Table 3		-
Twist (V)	-	2 mm plus 0.5 mm/m length		-
Straightness(e)	0.2 % of total length and 3 mm over any 1 m length	0.15 % of total length and 3 mm over any 1 m length		0.2 % of total length and 3 mm over any 1 m length
Mass(M)	±6 % on individual delivered lengths