EN10219 S355NLH SHS/RSH Pipe
EN10219 S355NLH SHS/RSH Pipe – Low-Temperature Structural Hollow Section Steel
Detailed material data for EN10219 S355NLH cold-formed welded square/rectangular hollow section pipes, featuring excellent low-temperature toughness and high strength for structural applications.
Cold forming, welding (SAW/HFW), normalizing or normalized rolling, hot-dip galvanizing, machining, cutting, drilling
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EN10219 S355NLH SHS/RSH Pipe Introduction
EN10219 S355NLH is a cold-formed welded structural hollow section made from thermomechanically rolled or normalized fine-grain steel. The designation 'N' indicates a normalized or normalized-rolled delivery condition, while 'L' specifies guaranteed Charpy impact properties at -50 °C. It offers a minimum yield strength of 355 MPa for thicknesses up to 16 mm, combined with good weldability and ductility. This grade is widely used in demanding structural applications where low-temperature toughness is essential, such as offshore platforms, bridges, and heavy machinery. The hollow sections are available in square (SHS) and rectangular (RSH) forms, delivering an optimized strength-to-weight ratio and aesthetic appeal.
EN10219 S355NLH SHS/RSH Pipe Chemical Composition
The ladle analysis limits for S355NLH according to EN 10219-1. The steel is fully killed and contains fine-grain elements (Nb, V, Ti) to ensure good low-temperature toughness. The carbon equivalent value (CEV) is controlled to guarantee weldability.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | For thickness ≤ 40 mm |
| Silicon (Si) | 0.50 | |
| Manganese (Mn) | 1.65 | |
| Phosphorus (P) | 0.030 | |
| Sulfur (S) | 0.025 | |
| Aluminum (Al total) | ≥ 0.020 | Minimum soluble aluminum content |
| Niobium (Nb) | 0.05 | |
| Vanadium (V) | 0.12 | Sum of Nb+V+Ti ≤ 0.22% |
| Titanium (Ti) | 0.05 | |
| Nickel (Ni) | 0.80 | |
| Chromium (Cr) | 0.30 | |
| Molybdenum (Mo) | 0.10 | |
| Copper (Cu) | 0.35 | |
| Nitrogen (N) | 0.015 | |
| Carbon equivalent (CEV) | max 0.43 – 0.50 depending on thickness | CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
EN10219 S355NLH SHS/RSH Pipe Thermal and Electrical Physical Properties
Typical physical properties for mild carbon structural steel at room temperature (20 °C). These values serve as engineering guidelines and are not subject to mandatory inspection according to the product standard.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | 81 | GPa | Calculated from E and Poisson's ratio |
| Poisson's ratio (ν) | 0.30 | - | Elastic range |
| Thermal expansion coefficient (α) | 12×10⁻⁶ | /K | Between 20 °C and 100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρe) | 1.7×10⁻⁷ | Ω·m | 20 °C |
EN10219 S355NLH SHS/RSH Pipe Mechanical Properties
Tensile and impact properties as required by EN 10219-1 for grade S355NLH. Values are valid for longitudinal direction and wall thicknesses ≤ 16 mm unless otherwise noted. Charpy impact test temperature is -50 °C.
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Upper yield strength (ReH) | 355 min | MPa | Thickness ≤ 16 mm |
| Upper yield strength (ReH) | 345 min | MPa | 16 < thickness ≤ 40 mm |
| Upper yield strength (ReH) | 335 min | MPa | 40 < thickness ≤ 63 mm |
| Upper yield strength (ReH) | 325 min | MPa | 63 < thickness ≤ 80 mm |
| Upper yield strength (ReH) | 315 min | MPa | 80 < thickness ≤ 100 mm |
| Tensile strength (Rm) | 470 - 630 | MPa | All thicknesses |
| Elongation after fracture (A5) | 22 min | % | Gauge length 5.65√S0, longitudinal |
| Bend test (bending angle 180°) | D = 3a (t ≤ 16 mm) | Mandrel diameter D, specimen thickness a; no cracking | |
| Charpy V-notch impact energy (KV2) | 27 min | J | At -50 °C, longitudinal, average of 3 specimens (1 individual value ≥ 19 J) |
EN10219 S355NLH SHS/RSH Pipe Fully Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S355NLH | Original standard; cold-formed hollow sections |
| European Union | EN 10210-1 | S355NLH | Hot-finished hollow sections; chemical and mechanical equivalence |
| European Union | EN 10025-3 | S355NL | Base material for plate and open sections; same grade properties |
| International | ISO 630-3 | S355NL | Structural steels – fine grain structural steels |
| Russia / CIS | GOST 27772-88 | C355-1 | Approximate equivalent; requires verification of impact temperature |
| Japan | JIS G 3466 | STKR490 (low-temp) | Not fully equivalent; similar strength but toughness class may differ |
EN10219 S355NLH SHS/RSH Pipe Application Introduction
S355NLH hollow sections provide a balanced combination of strength, toughness, and weldability, making them suitable for demanding structural applications in sub-zero environments. The normalizing heat treatment ensures uniform microstructure and reliable mechanical properties.
Product Applications: Offshore platform legs, braces and topside structures, Bridge girders, arches and trusses, Crane booms and lattice structures, Highload columns and beams in stadiums, airports, Liquid natural gas (LNG) storage tank shells, Ship stiffeners and superstructures, Roll-over protective structures (ROPS)
Processed into products: Welded tubular joints and nodes, End plates and base plates for columns, Brackets and support arms, Shear connectors and stiffeners, Framework elements in lowtemperature service, Hydraulic cylinder bodies, Piling tubes and foundation piles
Application industries: Offshore and maritime engineering, Bridge construction, Heavy machinery and cranes, Transmission towers and masts, Building and civil engineering, Transportation (railway, automotive components), Renewable energy (wind turbine frames, solar supports)
EN10219 S355NLH SHS/RSH Pipe Similar Alternative Materials for Reference
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S355J2H | Similar strength; impact test at -20 °C instead of -50 °C |
| European Union | EN 10219-1 | S355K2H | Similar strength; impact test at -20 °C with higher energy requirement |
| European Union | EN 10219-1 | S420NLH | Higher yield strength (420 MPa); same -50 °C toughness class |
| USA | ASTM A500 / A500M | Grade C | Structural tubing; yield 345 MPa; not standardized for -50 °C impact |
| USA | ASTM A1085 / A1085M | Grade 50 | Cold-formed hollow sections; yield 345 MPa; optional low-temperature toughness |
Notes:
- All hollow sections are externally dimensioned; the wall thickness is subject to negative tolerances as per EN 10219-2.
- Welding consumables should be selected to match the base metal toughness; preheating is not generally required for moderate wall thicknesses (< 30 mm) when CEV ≤ 0.45.
- The product can be supplied with a factory applied protective coating or hot-dip galvanized (duplex system) if required.
- For vacuum or pressure applications, the material may be subject to additional leak-tightness tests upon agreement.
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