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EN 10253 Type B Specialists
EN 1.0488 P275NL1 EN 10028-3 LTCS −50°C Charpy ≈ ASTM WPL6

P275NL1 (1.0488) Low-Temperature Carbon Steel Pipe Fittings

Low-temperature normalised carbon steel buttweld fittings Charpy impact tested at −50°C. The European equivalent of ASTM A420 WPL6 for LPG storage, refrigeration piping, cold gas service, and cryogenic process plant headers.

Chemical Composition — P275NL1 (EN 10028-3)

ElementMax %
Carbon (C)0.16
Silicon (Si)0.50
Manganese (Mn)0.80–1.50
Phosphorus (P)0.025
Sulphur (S)0.010
Aluminium (Al)≥0.020
Nitrogen (N)0.012

Aluminium content ≥0.020% ensures adequate grain refinement for low-temperature Charpy performance. Nitrogen limit is critical — excess N causes strain ageing and embrittlement.

Mechanical Properties — P275NL1

PropertyValue
Yield Strength (Rp0.2, min)275 MPa
Tensile Strength (Rm)370–490 MPa
Elongation (A, min)24%
Charpy Test Temperature−50°C
Charpy KV (avg, min)40 J (longitudinal)
Charpy KV (individual min)28 J
Heat TreatmentNormalised (N)

EN Low-Temperature Carbon Steel (LTCS) Grade Comparison

EN Grade W.Nr. Min YS (MPa) Charpy Temp Charpy KV (avg) ASTM Equivalent Standard
P275NL11.0488275−50°C40 J≈ WPL6 (−46°C)EN 10028-3
P275NL21.1104275−50°C50 J (tougher)≈ WPL6 (tougher Charpy)EN 10028-3
P355NL11.0566355−50°C40 Jhigher-yield alternative to WPL6EN 10028-3
P355NL21.1106355−50°C50 J (tougher)higher-yield, tougher CharpyEN 10028-3

NL1 vs NL2: Both tested at −50°C. NL2 requires higher Charpy average (50 J vs 40 J) — specify NL2 where the design code calls for elevated toughness assurance.

ASTM WPL6 vs EN P275NL1

  • ›Test temperature: ASTM WPL6 at −46°C (−50°F) vs EN P275NL1 at −50°C — EN is marginally colder by 4°C
  • ›Charpy energy: ASTM requires 27 J avg / 20 J individual; EN requires 40 J avg / 28 J individual — EN is tougher
  • ›Yield strength: ASTM WPL6 min 240 MPa; EN P275NL1 min 275 MPa — EN is slightly stronger
  • ›S and P limits: EN is tighter (S ≤0.010% vs ASTM ≤0.025%)
  • ›Conclusion: P275NL1 is broadly equivalent to WPL6 and meets or exceeds it on every key parameter. Used interchangeably on European-spec projects

Typical Applications

  • ›LPG storage and loading: Sphere and bullet tank piping, manifolds, loading arms at propane/butane terminals
  • ›Refrigeration piping: Ammonia and freon refrigeration systems in cold storage plants
  • ›Cold gas distribution: Natural gas odorisation systems and satellite distribution networks in cold climates
  • ›Ethylene and propylene: Cold process sections in petrochemical cracker fractionation trains
  • ›Offshore cold service: Sub-Arctic topsides and subsea pipework where ambient temperature drives LTCS selection
Related EN LTCS grade: P355NL1 (1.0566) — higher yield LTCS | ASTM equivalents: WPL6

Quote P275NL1 LTCS Fittings

Type B fittings made from EN 10028-3 material (P275NL1 is not listed in EN 10253-2; its listed low-temperature grades are P215NL 1.0451 and P265NL 1.0453). Charpy impact test certificates at −50°C included as standard. EN 10204 3.1. Supply to PED 2014/68/EU Module D.

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Testing & Inspection

  • ✓ Chemical analysis against EN 10028-3
  • ✓ Tensile test, with impact test where the standard or your order requires it
  • ✓ Charpy impact test at −50°C
  • ✓ PMI (positive material identification) on every order
  • ✓ Visual and dimensional inspection to EN 10253
  • ✓ NDT (UT, RT, MT or PT) when your order or code calls for it
  • ✓ EN 10204 3.1 certificate as standard; 3.2 with TÜV, Lloyd's Register, Bureau Veritas, DNV or your own inspector

Size Range

DN15–DN600 and larger. Outside diameters follow the EN 10220 / EN ISO 1127 pipe series; wall thickness is matched to your connecting pipe.

SizeOD (mm)
DN 1521.3
DN 2026.9
DN 2533.7
DN 3242.4
DN 4048.3
DN 5060.3
DN 6576.1
DN 8088.9
DN 100114.3
DN 125139.7
DN 150168.3
DN 200219.1
DN 250273.0
DN 300323.9
DN 350355.6
DN 400406.4
DN 450457.0
DN 500508.0
DN 600610.0

Export Documents & Packing

  • ✓ Commercial invoice, packing list and certificate of origin
  • ✓ EN 10204 certificates with heat-number traceability
  • ✓ PED 2014/68/EU and AD 2000-Merkblatt W0 documentation for European projects
  • ✓ Seaworthy wooden cases or pallets, bevel ends protected, marked to your instructions
  • ✓ FOB, CFR or CIF delivery terms
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Frequently Asked Questions: P275NL1 (1.0488) Fittings

What is P275NL1 (1.0488)?

A normalised low-temperature carbon steel whose fittings are Charpy impact tested at −50°C.

What is the ASTM equivalent of P275NL1?

ASTM A420 WPL6.

Where are P275NL1 fittings used?

LPG storage, refrigeration piping, cold gas service and cryogenic process plant headers.

Supplying an Indian boiler or ASME B16.9 project? The closest ASTM grade is listed on our group site ibrfittings.com: ASTM A420 WPL6 fittings.

Further reading