Steel P460NL2 N-50-70
Heat-treated state
EN 1.8918
Thick-wall vessels; tensile band and yield both step down, preheat mandatory for welding.
Values for the N-50-70 condition
Other P460NL2 tempers and conditions
P460NL2 is listed in 7 conditions; see the grade overview at P460NL2.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N | Maximum standard thickness; through-thickness properties and UT class should be specified. | 375 | 590 | 22 | 170 HB | 8.6 % IACS |
N | Very heavy sections for nozzles/tubesheets; 380 MPa minimum yield. | 405 | 595 | 22 | 172 HB | 8.6 % IACS |
N-50-70This page N | Thick-wall vessels; tensile band and yield both step down, preheat mandatory for welding. | 425 | 600 | 23 | 176 HB | 8.6 % IACS |
N | Heavy shell/head plate where 420 MPa minimum yield is acceptable. | 445 | 610 | 23 | 180 HB | 8.6 % IACS |
N | Mid-thickness shell plate; yield class drops one step to 440 MPa minimum. | 465 | 615 | 24 | 182 HB | 8.6 % IACS |
Normalized then stress-relieved / simulated PWHT | Order when the fabricated vessel will see PWHT (typ. 530–580 °C); properties verified after simulated heat treatment. | 465 | 605 | 25 | 178 HB | 8.6 % IACS |
NDefault Normalized | Standard delivery condition for thin pressure-vessel plate; full 460 MPa yield class with −50 °C impact guarantee. | 480 | 620 | 24 | 185 HB | 8.6 % IACS |
What is P460NL2 N-50-70?
P460NL2 N-50-70 is P460NL2 heat treated to N-50-70 — thick-wall vessels; tensile band and yield both step down, preheat mandatory for welding. P460NL2 N-50-70 has a yield strength of 425 MPa (61.6 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 52% of steel grades. Elongation at break is 23% and the elastic modulus is 210 GPa (30.5 Msi). P460NL2 N-50-70 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). N is the default condition FabDigit quotes; N-50-70 is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 145 MPa·√m (132 ksi·√in), better than 95% of steel grades
- Readily welded — 73/100, better than 76% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
P460NL2 N-50-70 properties
Typical room-temperature values for P460NL2 N-50-70; 22 are specific to this condition. Other listed values are P460NL2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
P460NL2 N-50-70 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
P460NL2 N-50-70 has a yield strength of 425 MPa (61.6 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 52% of steel grades. Elongation at break is 23% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P460NL2 N-50-70 is rated for continuous service to 400°C (752 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
P460NL2 N-50-70 conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P460NL2 N-50-70 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
P460NL2 N-50-70's machinability is good (60/100, better than 83% of steel grades); weldability very good (73/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with P460NL2 N-50-70
Is P460NL2 easy to machine?
Machines like normalized S355/A516 plate — carbide tooling, ~120–180 m/min turning speed, good chip control, no special tooling needed.
Can P460NL2 be welded?
Readily weldable by SAW/SMAW/GMAW with low-hydrogen consumables; CEV up to ~0.53 means preheat 100–150 °C above ~30 mm, control heat input and interpass to keep HAZ toughness at −50 °C.
Can P460NL2 be formed, bent or molded?
Cold forms and rolls to vessel shells with generous radii (≥2t); hot forming 900–1000 °C must be followed by re-normalizing to restore the fine grain and low-temperature toughness.
What surface finishes work on P460NL2?
No inherent corrosion resistance — shot-blast to Sa 2½ and apply epoxy/zinc-rich paint, metallize or clad; not anodizable.
P460NL2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cladle analysis | ≤ 0.2 | 0.17 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 1.1 – 1.7 | 1.5 |
| Ptightened for NL2 grade | ≤ 0.02 | 0.01 |
| SNL2 low-sulphur requirement; ≤0.010 in some editions | ≤ 0.01 | 0 |
| Altotal Al, grain refining | ≥ 0.02 | 0.04 |
| N | ≤ 0.02 | 0.01 |
| Cr | ≤ 0.3 | 0.1 |
| Cu | ≤ 0.7 | 0.15 |
| Mo | ≤ 0.1 | 0.04 |
| Niaids low-temperature toughness | ≤ 0.8 | 0.3 |
| Nbmicroalloy | ≤ 0.05 | 0.03 |
| Timicroalloy | ≤ 0.03 | 0.02 |
| VNb+Ti+V ≤ 0.22 total | ≤ 0.2 | 0.08 |
| Fe | balance | — |
P460NL2 N-50-70 — frequently asked
What is P460NL2 N-50-70 used for?
P460NL2 N-50-70 is typically used for cryogenic pressure vessels, LNG-related equipment, boiler drums and chemical process vessels. In short: -50 °C vessel grade; stricter than P460NL1; Z35 quality available.
What is the yield strength of P460NL2 N-50-70?
P460NL2 N-50-70 has a typical yield strength of 425 MPa (61.6 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 52% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is P460NL2 N-50-70 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like normalized S355/A516 plate — carbide tooling, ~120–180 m/min turning speed, good chip control, no special tooling needed.
Can P460NL2 N-50-70 be welded?
Yes — weldability is rated very good (73/100). Readily weldable by SAW/SMAW/GMAW with low-hydrogen consumables; CEV up to ~0.53 means preheat 100–150 °C above ~30 mm, control heat input and interpass to keep HAZ toughness at −50 °C.
What surface finishes work on P460NL2 N-50-70?
No inherent corrosion resistance — shot-blast to Sa 2½ and apply epoxy/zinc-rich paint, metallize or clad; not anodizable.
Can P460NL2 N-50-70 be formed, bent or molded?
Cold forms and rolls to vessel shells with generous radii (≥2t); hot forming 900–1000 °C must be followed by re-normalizing to restore the fine grain and low-temperature toughness.
What is the maximum service temperature of P460NL2 N-50-70?
P460NL2 N-50-70 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between P460NL2-N and P460NL2 N-50-70?
N is the default condition — standard delivery condition for thin pressure-vessel plate; full 460 MPa yield class with −50 °C impact guarantee. N-50-70: thick-wall vessels; tensile band and yield both step down, preheat mandatory for welding. Yield strength is 480 MPa in N versus 425 MPa in N-50-70.
Sources
- EN 10028-3 Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized — CEN (2017)
- EN 10164 Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
- EN 13445-2/-3 Unfired pressure vessels — Materials and Design — CEN (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Pressure vessel plate datasheets (Dillinger / Voestalpine / Ilsenburger Grobblech P460NL1-NL2) — Various European plate mills (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.