Steel 11MnNi5-3 +NT (Normalized and tempered)
Heat-treated state
EN 11MnNi5-3
Choose when extra stress relief and the most uniform low-temperature toughness are needed in thicker plate or after heavy forming.
Values for the +NT condition
Other 11MnNi5-3 tempers and conditions
11MnNi5-3 is listed in 5 conditions; see the grade overview at 11MnNi5-3.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+N | Same normalized condition in heavier gauges, where the specified minimum yield drops with thickness. | 310 | 455 | 30 | 145 HB | 8.6 % IACS |
EN 10222-3 forged flanges/fittings, normalized + tempered | Delivery condition for forged flanges, nozzles and fittings matched to +N/+NT plate in cryogenic vessels. | 320 | 470 | 28 | 150 HB | 8.6 % IACS |
+NDefault Normalized | Standard delivery condition for EN 10028-4 low-temperature pressure-vessel plate; pick for tanks and vessels down to −60 °C. | 330 | 470 | 30 | 150 HB | — |
+NTThis page Normalized and tempered | Choose when extra stress relief and the most uniform low-temperature toughness are needed in thicker plate or after heavy forming. | 335 | 460 | 31 | 148 HB | 8.6 % IACS |
Quenched and tempered | Less common condition for heavy forgings and thick shells where higher yield and through-thickness toughness are required. | 380 | 510 | 28 | 165 HB | 8.4 % IACS |
What is 11MnNi5-3 +NT?
11MnNi5-3 +NT is 11MnNi5-3 heat treated to +NT — choose when extra stress relief and the most uniform low-temperature toughness are needed in thicker plate or after heavy forming. 11MnNi5-3 +NT has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 77% of steel grades. Elongation at break is 31% and the elastic modulus is 210 GPa (30.5 Msi). 11MnNi5-3 +NT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). +N is the default condition FabDigit quotes; +NT is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 31%, better than 94% of steel grades
- Easy to machine — 65/100, better than 93% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
Limitations
- Low strength — 335 MPa (48.6 ksi), worse than 77% of steel grades
11MnNi5-3 +NT properties
Typical room-temperature values for 11MnNi5-3 +NT; 23 are specific to this condition. Other listed values are 11MnNi5-3 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
11MnNi5-3 +NT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical14
11MnNi5-3 +NT has a yield strength of 335 MPa (48.6 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 77% of steel grades. Elongation at break is 31% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
11MnNi5-3 +NT is rated for continuous service to 350°C (662 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical2
11MnNi5-3 +NT has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 11MnNi5-3 +NT takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 25%.
Manufacturability7
11MnNi5-3 +NT's machinability is good (65/100, better than 93% of steel grades); weldability excellent (88/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 11MnNi5-3 +NT
Is 11MnNi5-3 easy to machine?
Machines like normalized C-Mn pressure-vessel plate — moderate feeds with coated carbide, gummy chips, no work-hardening problems.
Can 11MnNi5-3 be welded?
Very good weldability with low carbon equivalent; use low-hydrogen consumables with matching Ni content, moderate preheat in thick sections and control heat input to preserve −60 °C toughness.
Can 11MnNi5-3 be formed, bent or molded?
Good cold formability for heads and shells; hot forming 850–950 °C followed by re-normalizing, and stress relief 550–600 °C after heavy cold work.
What surface finishes work on 11MnNi5-3?
No self-protection: shot-blast then paint, epoxy or metallize; hot-dip galvanizing possible but check toughness after zinc bath exposure.
11MnNi5-3 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 |
|---|---|---|
| Cgrade designator 11 ≈ 0.11 % C | ≤ 0.14 | 0.11 |
| Si | ≤ 0.5 | 0.25 |
| Mn | 0.7 – 1.5 | 1.1 |
| P | ≤ 0.03 | 0.01 |
| Slow S for through-thickness toughness | ≤ 0.01 | 0 |
| Ni | 0.3 – 0.85 | 0.55 |
| Crresidual | ≤ 0.3 | 0.08 |
| Curesidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.08 | 0.02 |
| Nbgrain refining | ≤ 0.05 | 0.02 |
| V | ≤ 0.05 | 0.01 |
| Ti | ≤ 0.05 | 0.01 |
| Altotal Al, fine-grain treatment | ≥ 0.02 | 0.04 |
| N | ≤ 0.01 | 0.01 |
| Fe | balance | — |
11MnNi5-3 +NT — frequently asked
What is 11MnNi5-3 +NT used for?
11MnNi5-3 +NT is typically used for offshore structures, shipbuilding plate and low temperature forgings. In short: toughness to −60 °C; highly weldable low-alloy plate; fine-grain cold-service steel.
What is the yield strength of 11MnNi5-3 +NT?
11MnNi5-3 +NT has a typical yield strength of 335 MPa (48.6 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 77% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 11MnNi5-3 +NT easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Machines like normalized C-Mn pressure-vessel plate — moderate feeds with coated carbide, gummy chips, no work-hardening problems.
Can 11MnNi5-3 +NT be welded?
Yes — weldability is rated excellent (88/100). Very good weldability with low carbon equivalent; use low-hydrogen consumables with matching Ni content, moderate preheat in thick sections and control heat input to preserve −60 °C toughness.
What surface finishes work on 11MnNi5-3 +NT?
No self-protection: shot-blast then paint, epoxy or metallize; hot-dip galvanizing possible but check toughness after zinc bath exposure.
Can 11MnNi5-3 +NT be formed, bent or molded?
Good cold formability for heads and shells; hot forming 850–950 °C followed by re-normalizing, and stress relief 550–600 °C after heavy cold work.
What is the maximum service temperature of 11MnNi5-3 +NT?
11MnNi5-3 +NT is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10028-4 Flat products made of steels for pressure purposes — Nickel alloy steels with specified low temperature properties — CEN (2017)
- EN 10222-3 Steel forgings for pressure purposes — Nickel steels with specified low temperature properties — CEN (1998)
- EN 10216-4 Seamless steel tubes for pressure purposes — Non-alloy and alloy steels with specified low temperature properties — CEN (2013)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Low-temperature pressure-vessel plate datasheets (1.6212 / 11MnNi5-3) — European plate mills (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.