S355NL Round Bar and Pipe Uses

S355NL Round Bar and Pipe Uses

S355NL round bar and S355NL pipe are high-strength, low-alloy structural components under EN 10025-3, known for their excellent toughness, weldability, and performance in low-temperature environments. Derived from the same fine-grain steel as S355NL plates, these forms are used in demanding applications requiring precision machining or fluid transport in cold climates, such as offshore drilling and cryogenic piping. This article explores the uses of S355NL round bar and S355NL pipe, their chemical composition, mechanical properties, and fabrication considerations, addressing core keywords s355nl round bar and s355nl pipe. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

What is S355NL Steel?

S355NL is a fine-grain structural steel under EN 10025-3, delivered in normalized or normalized rolled condition. Its designation indicates:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• NL: Normalized, with impact toughness tested at -50°C.

S355NL round bar is forged or hot-rolled into cylindrical shapes for shafts and pins, while S355NL pipe is seamless or welded tubing for fluid conveyance in cold environments.

Chemical Composition of S355NL

The composition ensures the durability of S355NL round bar and S355NL pipe:

Carbon Equivalent (CEV): ≤0.43% (≤63 mm), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, ensures weldability for S355NL pipe.

Mechanical Properties

The properties support the uses of S355NL round bar and S355NL pipe:

• Yield Strength: ≥355 MPa for load-bearing.
• Tensile Strength: 470-630 MPa for durability.
• Impact Toughness: ≥27 J at -50°C for cold resistance.

Uses of S355NL Round Bar

S355NL round bar is machined into:

• Shafts and Pins: For cranes and heavy machinery in cold regions, leveraging toughness.
• Bolts and Fasteners: High-strength connections in offshore structures.
• Axles and Rods: In wind turbine components, ensuring fatigue resistance.

Diameters range from 10-300 mm, with normalized condition for uniformity.

Uses of S355NL Pipe

S355NL pipe is used for:

• Cryogenic Piping: Transporting LNG in cold climates, with -50°C toughness.
• Offshore Pipelines: Seamless or welded pipes for subsea applications.
• Pressure Systems: In vessels and heat exchangers for low-temperature fluids.

Available as seamless (up to 24" OD) or welded pipes, compliant with EN 10216-3.

Welding and Heat Treatment

S355NL is weldable:

• Welding: GMAW or SAW per EN 1011-2. Preheating (100-150°C) for >20 mm.
• PWHT: Optional at 550-650°C.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).

Supports fabrication of S355NL round bar and S355NL pipe.

Why Choose Gangsteel?

Gangsteel supplies S355NL round bar and S355NL pipe:

• Inventory: Extensive stock in China.
• Sizes: Round bar 10-300 mm dia.; pipe up to 24" OD, thickness 6–250 mm.
• Delivery: 7-30 days globally.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160).
• Processing: Machining, welding, bending.

Contact us for EN 10025-3 S355NL normalized structural steel plate.

FAQ

What are uses of S355NL round bar?
S355NL round bar is used for shafts, pins, bolts, and axles in cranes, machinery, and wind turbines in cold climates, offering 355 MPa yield and -50°C toughness for high-load, low-temp applications.

What are applications of S355NL pipe?
S355NL pipe is used for cryogenic piping, offshore pipelines, and pressure systems in low-temperature fluids, with seamless/welded options up to 24" OD, ensuring durability at -50°C.

Is S355NL round barmachinable?
Yes, S355NL round bar’s moderate hardness (150-190 HB) and fine-grain structure allow easy machining for shafts and pins, with good surface finish in cold-forming.

How is S355NL pipefabricated?
S355NL pipe is produced as seamless (hot-rolled) or welded (ERW), with CEV ≤0.43% for GMAW welding, suitable for cryogenic transport in offshore projects.

What are sizes of S355NL round bar?
S355NL round bar diameters range from 10-300 mm, lengths up to 12 m, normalized for uniformity in machinery components.

What certifications for S355NL pipe?
S355NL pipe comes with EN 10204 3.1/3.2 certificates, UT testing (EN 10160), and ABS/LR/BV/DNV approvals for pressure systems.