Steel P460NH N-70-100
Heat-treated state
EN P460NH
N-70-100 = +N
Heavy plate for reactor shells; 400 MPa minimum proof strength.
Values for the N-70-100 condition
Other P460NH tempers and conditions
P460NH is listed in 7 conditions; see the grade overview at P460NH.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+N | Maximum standard thickness; 380 MPa minimum proof, toughness verified through-thickness. | 400 | 585 | 20 | 175 HB | 8.2 % IACS |
N-70-100This page +N | Heavy plate for reactor shells; 400 MPa minimum proof strength. | 420 | 595 | 20 | 178 HB | 8.2 % IACS |
+N | Thick-wall drums and headers; 420 MPa minimum proof, tensile band 560–710 MPa. | 440 | 600 | 21 | 180 HB | 8.2 % IACS |
+N | Heavier vessel shells; minimum proof strength 430 MPa. | 450 | 610 | 21 | 182 HB | 8.2 % IACS |
+N + stress relieved / simulated PWHT | Specify when the fabricated vessel will see post-weld heat treatment; slight loss of proof strength, improved dimensional stability. | 460 | 605 | 23 | 180 HB | 8.2 % IACS |
+N | Medium-thickness vessel plate; proof strength de-rated to 445 MPa minimum. | 465 | 615 | 22 | 185 HB | 8.2 % IACS |
NDefault Normalized | Standard as-supplied condition for thin pressure-vessel plate; full 460 MPa minimum proof strength. | 480 | 620 | 22 | 12 HRC | 8.2 % IACS |
What is P460NH N-70-100?
P460NH N-70-100 is P460NH heat treated to N-70-100 — heavy plate for reactor shells; 400 MPa minimum proof strength. P460NH N-70-100 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 595 MPa (86.3 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi). P460NH N-70-100 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). N is the default condition FabDigit quotes; N-70-100 is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 118 MPa·√m (107.4 ksi·√in), better than 77% 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
P460NH N-70-100 properties
Typical room-temperature values for P460NH N-70-100; 22 are specific to this condition. Other listed values are P460NH reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
P460NH N-70-100 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical17
P460NH N-70-100 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 595 MPa (86.3 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P460NH N-70-100 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
P460NH N-70-100 conducts electricity at 8.2 % IACS, better than 61% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of P460NH N-70-100 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 22%.
Manufacturability7
P460NH N-70-100's machinability is good (56/100, better than 71% of steel grades); weldability very good (73/100); formability good (56/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with P460NH N-70-100
Is P460NH easy to machine?
Machines like a normalized C-Mn-Ni plate steel (~55 % of AISI 1212) — use rigid setups, coated carbide, 120–180 m/min, and expect stringy chips from the low-S ladle chemistry.
Can P460NH be welded?
Readily welded by SMAW/SAW/GMAW with matching low-hydrogen consumables; CEV ≈ 0.43–0.50, so preheat 100–150 °C above 30 mm and control interpass to protect the −20 °C HAZ toughness.
Can P460NH be formed, bent or molded?
Cold-forms and rolls into shells with generous bend radii (≥2.5 t transverse); hot forming 900–1000 °C must be followed by re-normalizing at 880–930 °C to restore the fine grain.
What surface finishes work on P460NH?
Not anodizable — shot-blast to Sa 2½ then epoxy/zinc-rich primer, metallize, or apply a corrosion allowance/clad layer for wet or chloride service.
P460NH 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 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.04 |
| Cr | ≤ 0.3 | 0.1 |
| Cu | ≤ 0.7 | 0.15 |
| Mo | ≤ 0.1 | 0.04 |
| Ni | ≤ 0.8 | 0.45 |
| Nb | ≤ 0.05 | 0.03 |
| Ti | ≤ 0.03 | 0.01 |
| VNb+Ti+V ≤ 0.26 % | ≤ 0.2 | 0.08 |
| Zr | ≤ 0.05 | — |
| N | ≤ 0.03 | 0.01 |
| Fe | balance | — |
P460NH N-70-100 — frequently asked
What is P460NH N-70-100 used for?
P460NH N-70-100 is typically used for boilers, pressure vessels and petrochemical and power plant equipment. In short: strongest NH vessel grade; 400 °C service rating; nickel-alloyed normalized plate.
What is the yield strength of P460NH N-70-100?
P460NH N-70-100 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 595 MPa (86.3 ksi) — weaker than 53% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is P460NH N-70-100 easy to machine?
Reasonably — machinability is rated good (56/100, better than 71% of steel grades). Machines like a normalized C-Mn-Ni plate steel (~55 % of AISI 1212) — use rigid setups, coated carbide, 120–180 m/min, and expect stringy chips from the low-S ladle chemistry.
Can P460NH N-70-100 be welded?
Yes — weldability is rated very good (73/100). Readily welded by SMAW/SAW/GMAW with matching low-hydrogen consumables; CEV ≈ 0.43–0.50, so preheat 100–150 °C above 30 mm and control interpass to protect the −20 °C HAZ toughness.
What surface finishes work on P460NH N-70-100?
Not anodizable — shot-blast to Sa 2½ then epoxy/zinc-rich primer, metallize, or apply a corrosion allowance/clad layer for wet or chloride service.
Can P460NH N-70-100 be formed, bent or molded?
Cold-forms and rolls into shells with generous bend radii (≥2.5 t transverse); hot forming 900–1000 °C must be followed by re-normalizing at 880–930 °C to restore the fine grain.
What is the maximum service temperature of P460NH N-70-100?
P460NH N-70-100 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 P460NH-N and P460NH N-50-70?
N is the default condition — standard as-supplied condition for thin pressure-vessel plate; full 460 MPa minimum proof strength. N-50-70: thick-wall drums and headers; 420 MPa minimum proof, tensile band 560–710 MPa. Yield strength is 480 MPa in N versus 440 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 10027-2 Designation systems for steels — steel numbers (1.8935) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Pressure vessel plate grade data sheets (P355NH–P460NH) — Dillinger / voestalpine Grobblech (2022)
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.