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Tianjin Lefin Industrial Co.,Ltd

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

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Tianjin Lefin Industrial Co.,Ltd.

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

OEM&ODM

Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.

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Mali HOT DIP GALVANIZED STEEL PIPE

Mali EN 10210 S355J2H Carbon Steel Pipe

The EN 10210 standard is a European standard for hot finished rectangular hollow sections. The S355J2H carbon steel pipe is a type of steel pipe that complies with this standard. It is widely used in various industrial applications due to its excellent mechanical properties and versatility.

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Product Description

Standard And Material Specification
Standard: EN 10210
A European standard specifying the technical delivery conditions for hot-finished hollow structural sections (HSS) made of non-alloy and fine-grain steels.

Grade: S355J2H
S355: Indicates minimum yield strength of 355 MPa at room temperature.

J2: Charpy V-notch impact toughness requirement at -20°C (27 Joules minimum).

H: Denotes hot-finished production (as opposed to cold-formed).

Chemical Properties

Steel Grade	C Maximum	Mn Maximum	Si Maximum	P Maximum	S Maximum	N Maximum
S235JRH	0.17	1.40	–	0.040	0.040	0.009
S355J0H	0.22	1.60	0.55	0.035	0.035	0.009
S275J2H	0.20	1.50	–	0.030	0.030	–
S355J2H	0.22	1.60	0.55	0.030	0.030	–
S275J0H	0.20	1.50	–	0.035	0.035	0.009
S355K2H	0.22	1.60	0.55	0.030	0.030	–

Carbon (C) – Enhances hardness and strength but reduces ductility and weldability (controlled to ≤0.22% for balance).

Silicon (Si) – Improves strength and deoxidation during steelmaking (limited to ≤0.55% to avoid brittleness).

Manganese (Mn) – Increases strength and hardenability while improving hot workability (≤1.6%).

Phosphorus (P) & Sulfur (S) – Harmful impurities (≤0.030% each); reduce toughness and promote cracking.

Key Impact: Elements are balanced to achieve optimal mechanical properties (strength, weldability, impact resistance) for structural applications.

Mechanical Properties

EN 10210	Mechanical Strength			Impact Energy
	Yield Strength (WT≤16mm)	Elongation (%) (WT≤40mm)	Tensile Strength (WT≤3mm)	Test Temperature in celsius
	Yield Strength (WT≤16mm)	Elongation (%) (WT≤40mm)	Tensile Strength (WT≤3mm)	-20	0	20
S355J2H	355	22	510-680	27	–	–
S275J0H	275	23	430-580	–	27	–
S275J2H	275	23	430-580	27	–	–
S235JRH	235	26	360-510	–	–	27
S355J0H	355	22	510-680	–	27	–
S355K2H	355	22	510-680	40	–	–

Yield Strength (≥355 MPa) – Indicates the stress at which permanent deformation begins; ensures structural stability under load.

Tensile Strength (510–680 MPa) – Measures maximum stress before failure; guarantees resistance to breaking under tension.

Elongation (≥22%) – Reflects ductility; higher values mean better formability and crack resistance.

Charpy Impact (≥27 J at -20°C) – Evaluates toughness in cold environments; critical for shock/fracture resistance.

Key Impact: These properties ensure the pipe can withstand heavy loads, dynamic forces, and low temperatures without failure.

Manufacturing Process
Raw Material Preparation: High-quality steel slabs or billets with the specified chemical composition for S355J2H are selected.

Heating: The steel is heated to around 1100–1200°C to make it ductile for shaping.

Rolling: The heated steel is rolled through specialized mills to form the rectangular hollow sections, ensuring precise dimensions and uniform wall thickness.

Cooling and Straightening: The pipe is cooled gradually to avoid internal stresses and then straightened if necessary.

Inspection and Testing: The finished pipe undergoes dimensional checks, non-destructive testing (e.g., ultrasonic), and mechanical property tests to ensure compliance with EN 10210 standards.

Surface Treatment (Optional): The pipe may be painted or galvanized to enhance corrosion resistance.

Packaging and Storage: The pipes are packaged and stored for shipment.

Applications
Structural Engineering: Building frames, bridges, and offshore platforms.

Mechanical Components: Heavy machinery, load-bearing parts.

Infrastructure: Pipelines, support columns, and crane booms.

Advantages
High Strength-to-Weight Ratio: Suitable for heavy-load applications.

Good Weldability: Preheating may be required for thick sections.

Impact Resistance: Reliable performance in low-temperature environments.

In summary, EN 10210 S355J2H is a high-strength carbon steel pipe offering excellent mechanical properties and impact resistance. Its hot-finished production ensures superior quality for structural applications in construction, machinery, and infrastructure. With certified performance and cost efficiency, it's a reliable choice for demanding engineering projects.