EN 10210-1 Grade S420NH Pipe
EN 10210-1 Grade S420NH pipe is a hot finished structural hollow section made from normalized fine grain steel, with a minimum yield strength of 420 MPa for wall thickness up to 16 mm, a tensile range of 520–680 MPa, and verified impact toughness of 40 J at −20 °C. It is supplied as circular (CHS), square (SHS) and rectangular (RHS) hollow sections, in seamless or welded form, and is the workhorse high-strength grade for columns, bridges and offshore structures.
EN 10210-1 Grade S420NH Pipe Supplier
Whether you specify CHS, SHS or RHS, the grade commits the mill to the same metallurgical envelope - the choice that moves the numbers is wall thickness and hot finished vs cold formed, not the shape. Send your section, dimensions and quantity and we will confirm the specification and return a quotation with lead time within 24 hours. Request a quote.
EN 10210-1 Grade S420NH Pipe Specification
| Parameter | Capability |
|---|---|
| Standard | EN 10210-1:2006 (hot finished structural hollow sections of non-alloy and fine grain steels) |
| Grade / material number | S420NH / 1.8750; S420NLH / 1.8751 |
| Section form | Circular (CHS), square (SHS), rectangular (RHS), elliptical |
| Outside dimensions | CHS OD 21.3–610 mm; SHS 20×20 to 500×500 mm; RHS 20×40 to 500×300 mm (mill-dependent; Tata Celsius catalogue spans CHS 42.4–508 mm, SHS 40–400 mm, RHS 50×30–500×300 mm) |
| Wall thickness | Commonly 3–40 mm; CHS to about 60 mm on request. (0.5 mm is a cold formed fingerprint and is not a hot finished size.) |
| Length | 6 m / 12 m fixed, or random 6–12 m; cut-to-length available |
| Ends | Plain, bevelled, or square cut; end caps on request |
| Surface | Black (self-colour), varnished / oil coated, pre-galvanized, or hot dip galvanized |
| Manufacture | Seamless, ERW, LSAW or SSAW - all permitted by EN 10210-1 for hot finished sections |
| Certification | EN 10204 3.1 inspection certificate (full-length weld NDT); CE marking under EN 1090; third-party inspection (SGS, BV) available |
Size Range by Section Form
| Section form | Typical outside dimensions | Typical wall (mm) |
|---|---|---|
| CHS (circular) | OD 21.3–610 mm | 3–40 (to ~60 on request) |
| SHS (square) | 20×20 to 500×500 mm | 3–40 |
| RHS (rectangular) | 20×40 to 500×300 mm | 3–40 |
| Elliptical | Per mill programme | Confirm with mill |
The size you can actually buy depends on the mill's roll programme and the ordered quantity - Tata's Celsius catalogue, for example, runs CHS 42.4–508 mm, SHS 40–400 mm and RHS 50×30–500×300 mm. Always confirm the exact section and wall before issuing the purchase order.
EN 10210-1 S420NH Pipe Chemical Composition
| Carbon | Silicon | Manganese | Phosphorous | Sulphur | Molybdenum | Nickel |
|---|---|---|---|---|---|---|
| max 0.22 | max 0.60 | 1.00-1.70 | 0.035 | 0.03 | max 0.10 |
max 0.80 |
Mechanical Properties
| Property | S420NH value | Basis |
|---|---|---|
| Yield strength (ReH) min | 420 MPa (≤16 mm) / 400 MPa (16–40 mm) / 390 MPa (40–65 mm) | Thickness-dependent; above 65 mm the standard lists no value |
| Tensile strength (Rm) | 520–680 MPa | 520 is the TENSILE minimum, not the yield |
| Elongation (A₅) min | 19 % longitudinal / 17 % transverse | L₀ = 5.65 √S₀; thinner Charpy sub-size specimens scale the impact value |
| Impact (Charpy, longitudinal) | 40 J at −20 °C (NH); 40 J at −50 °C (NLH) | 10×10 mm specimen; 10×7.5 → 30 J; 10×5 → 20 J |
| Carbon equivalent (CEV) max | 0.50 (≤16 mm) / 0.52 (16–65 mm) | CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15; mills often declare 0.45 |
| Test standards | EN 10210-1:2006, EN 10002 / EN ISO 6892 (tensile), EN 10045 / ISO 148 (impact) | - |
The most misread number on this grade is 520: it is the bottom of the tensile range, not the yield. The yield you design to is 420 MPa at thin wall, stepping down with thickness. Above 65 mm wall the standard is silent - confirm the mill's declared value before relying on it.
Grade Ladder - S355NH vs S420NH vs S460NH
| Grade | ReH min (MPa) | Rm (MPa) | A₅ L/T min | Impact | CEV max |
|---|---|---|---|---|---|
| S355NH | 355 | 470–630 | 22 / 20 % | 40 J @ −20 °C | 0.43 / 0.45 |
| S420NH | 420 | 520–680 | 19 / 17 % | 40 J @ −20 °C | 0.50 / 0.52 |
| S460NH | 460 | 540–720 | 17 / 15 % | 40 J @ −20 °C | 0.50 / 0.52 |
Move up the ladder when weight or capacity drives the design; move down when weldability, elongation or cost dominate. S460NH sits in EN 10210-3 (high-strength and weather-resistant grades) and is the natural next step for weight-critical offshore and crane structures.
Dimensional Tolerances and Section Properties
| Parameter | Tolerance |
|---|---|
| Outside dimension (OD / B / H) | ±1 % with a minimum of ±0.5 mm and a maximum of ±10 mm |
| Wall thickness | −10 % (positive deviation limited by the mass tolerance) |
| Mass | ±6 % per section |
| Straightness | 0.2 % of length and maximum 3 mm/m |
| Ovality (circular) | 2 % for D/T ≤ 100 |
| Length | +150 / −0 mm |
| External corner radius | Up to 3T per standard; premium sections offer <2T |
Because the wall tolerance is one-sided (negative) and balanced by the mass tolerance, a section can be slightly under nominal wall yet still within mass limits - confirm which criterion your QA uses before rejecting a lot.
Applications
S420NH is chosen where a structure must carry high load, resist fatigue or cyclic loading, or perform in low-temperature and corrosive-service environments. The hot finished route gives it low residual stress and excellent toughness, which is why it is specified for safety-critical and dynamically loaded structures rather than purely decorative frames.
Building columns and frames
High-rise and long-span columns use S420NH CHS and RHS to reduce member weight and foundation load while keeping fabrication simple. The 420 MPa yield lets designers downsize sections relative to S355NH.
Stadiums and exhibition halls
Large-span roofs and trusses benefit from the light weight and the tight, aesthetically clean corner radius of hot finished sections, plus the good weldability needed for complex node connections.
Bridge structures
Bridges demand fatigue resistance and toughness. Hot finished S420NH has relieved residual stress and verified −20 °C impact, making it suitable for exposed and cyclically loaded bridge members.
Offshore and marine structures
Jacket legs, topside modules and offshore substructures use S420NH for its strength-to-weight ratio and low-temperature toughness. Where dynamic behaviour is involved, specify seamless or longitudinally welded sections and confirm spiral-welded use with the engineer (EN 10210-3 notes caution for fatigue-duty spiral welds).
Machinery and mechanical structures
Cranes, material-handling equipment and machine frames exploit the high strength and the cyclic-loading capability that hot finished fine grain steel provides.
Why choose GNEE
Integrated supply. GNEE operates multiple steel production lines and processing equipment (cutting, bending, bevelling, drilling, surface treatment) for both seamless and welded hollow sections.
Certified and traceable. ISO 9001 and CE certified, with EN 10204 3.1 mill certificates and third-party inspection (SGS, BV) available.
Stock and turnaround. Standing inventory of finished and raw material supports both stock and made-to-order business; sample and trial quantities are supported.
Export experience. Shipments to 60+ countries through Shanghai, Tianjin, Qingdao and Ningbo, with flexible FOB / CIF / CFR / FCA terms.
Technical support. Our team confirms the specification against your drawing and flags any grade/standard mismatch before production.
EN 10210-1 Grade S420NH Pipe Supplier-GNEE Team
GNEE Customers
GNEE Exhibition
Test and inspection
Packaging and Shipping
FAQ
What does S420NH mean?
S = structural steel; 420 = minimum yield strength 420 MPa; N = normalized (normalized rolled) fine grain steel; H = hollow section. The suffix NH means the section is verified for impact at −20 °C (40 J longitudinal); NLH is the −50 °C version, material number 1.8751.
What is the yield strength of S420NH?
Minimum yield is 420 MPa for wall thickness up to 16 mm, 400 MPa for 16–40 mm and 390 MPa for 40–65 mm. The tensile range is 520–680 MPa. For thickness above 65 mm the standard lists no value - confirm with the mill. Note 520 MPa is the TENSILE minimum, not the yield.
Is S420NH the same as S420MH?
No. S420NH is the hot finished grade to EN 10210-1 with tensile 520–680 MPa. S420MH is the cold formed grade to EN 10219-1 with tensile 500–660 MPa and a different (thermomechanical) delivery condition. They share the 420 MPa yield number but are not interchangeable without engineering verification.
Can EN 10210-1 S420NH replace EN 10219 S420MH?
Only after the project structural engineer confirms. Hot finished S420NH has very low residual stress and better toughness and galvanizing behaviour; cold formed S420MH has tighter dimensional tolerances and lower cost but higher corner residual stress. Substitution changes the strut curve and fabrication factors.
What sizes does S420NH come in?
As circular hollow section (CHS) typically OD 21.3–610 mm, square (SHS) 20×20 to 500×500 mm and rectangular (RHS) 20×40 to 500×300 mm, wall thickness commonly 3–40 mm (CHS to about 60 mm on request). Exact ranges depend on the mill; confirm availability before specifying.
Is S420NH suitable for hot dip galvanizing?
Yes. S420NH is a fully killed fine grain steel and is suitable for hot dip galvanizing per EN ISO 1461, fulfilling Category B of EN ISO 14713-2. State the galvanizing requirement and category at order stage so the mill controls the silicon and phosphorus balance.
What is the difference between EN 10210 and EN 10219?
EN 10210-1 covers hot finished hollow sections (formed hot, with or without heat treatment, or cold formed then normalized above ~580 °C). EN 10219-1 covers cold formed welded sections supplied without subsequent heat treatment. Hot finished grades have lower residual stress and better toughness; cold formed grades have tighter tolerances and lower cost.
What certificate comes with S420NH hollow sections?
A specific inspection document 3.1 to EN 10204, including full-length non-destructive testing of the weld, chemical analysis, mechanical and impact test results and heat traceability. For structural use in the EU the product carries CE marking under the EN 1090 execution standard.
Hot Tags: EN 10210-1 Grade S420NH Pipe, China EN 10210-1 Grade S420NH Pipe manufacturers, suppliers, A513 Seamless Tubing, ASTM A672 ERW Pipe, Stainless Steel Efw Pipes, ASTM A672 Grade B60 C65 EFW Steel Pipe, Q235B ERW Steel Pipe, SAW Pipe
You Might Also Like
Send Inquiry