Stainless Steel 1.4911
EN 1.4911
1.4911 (X8CrCoNiMo10-6) is a cobalt- and nickel-modified 10% Cr martensitic heat-resistant steel developed for creep strength in advanced turbine hardware.
Reference datasheet — 1.4911 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +QT900 condition
1.4911 tempers and conditions
1.4911 is supplied in 5 conditions, soft to hard. +QT900 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Supply/intermediate condition for rough machining and cold straightening before final quench and temper. | 520 | 780 | 20 | 22 HRC | — |
Quenched and high-tempered, Rm ≈ 800–950 MPa | Highest tempering temperature — pick when maximum toughness and long-term creep stability at 580–600 °C matter more than strength. | 660 | 870 | 18 | 26 HRC | — |
As-forged / hot-rolled | Rough bar, billet or forging supplied before final quench and temper; properties not guaranteed in this state. | 700 | 1,000 | 12 | 34 HRC | 2.9 % IACS |
+QT900Default Quenched (≈1040–1070 °C) and tempered, Rm ≈ 900–1050 MPa | Standard commercial delivery condition for turbine bolting, blades and rotor parts — balanced creep strength, toughness and machinability. | 760 | 960 | 16 | 30 HRC | — |
Quenched and low-tempered, Rm ≈ 1000–1200 MPa | Highest-strength condition for highly loaded fasteners and blade roots where service temperature stays below the tempering temperature. | 890 | 1,090 | 13 | 35 HRC | — |
What is 1.4911?
1.4911 (X8CrCoNiMo10-6) is a cobalt- and nickel-modified 10% Cr martensitic heat-resistant steel developed for creep strength in advanced turbine hardware. It is supplied as forgings and bar in +A, +QT800, +QT900, +QT1000 and +FORGED conditions, reaching 760 MPa yield, 960 MPa tensile, 16% elongation and 285 HB (30 HRC) with service to 600 °C. The cobalt content raises cost and the machinability score of 32 means slow, tooling-heavy cutting; corrosion resistance is limited to hot gas and steam, not aqueous service. Where the cobalt addition is not required, 1.4913 or 1.4923 are the usual substitutes. 1.4911 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,425°C (2,597 °F). 1.4911 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 216 GPa (31.3 Msi).
What is 1.4911 used for?
- steam turbine blades and rotors
- gas turbine components
- high-temperature fasteners
Advantages
- High strength — 760 MPa (110 ksi), better than 94% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Conducts heat well — 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades
Limitations
- Needs corrosion protection — 35/100, worse than 97% of stainless steel grades
- Limited ductility — 16%, worse than 88% of stainless steel grades
- Difficult to weld — 32/100, worse than 87% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Low fracture toughness — 85 MPa·√m (77.4 ksi·√in), worse than 77% of stainless steel grades
1.4911 properties
Typical room-temperature values for 1.4911-+QT900; bars are the position among stainless steel grades.
Physical3
1.4911 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
1.4911 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 94% of stainless steel grades. Elongation at break is 16% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
1.4911 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
1.4911 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), worse than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4911 takes about 55 MJ of energy and emits 4.8 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 35%.
Manufacturability8
1.4911's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability poor (32/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 1.4911 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4911
Is 1.4911 easy to machine?
Machine in the annealed or as-quench-and-tempered state with rigid setups, sharp carbide (coated) tools, moderate speed and heavy positive feed to avoid work hardening; grind or hard-turn after final temper.
Can 1.4911 be welded?
Weldable with matching or 9–12Cr filler using 250–350 °C preheat, controlled interpass and mandatory post-weld temper below the base tempering temperature to restore toughness.
Can 1.4911 be formed, bent or molded?
Hot forge at ~1100–850 °C with slow controlled cooling to avoid quench cracks; cold forming is essentially limited to straightening.
1.4911 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 designation X8 ⇒ ~0.08 % C | 0.05 – 0.12 | 0.08 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 0.8 | 0.5 |
| Pimpurity | ≤ 0.03 | |
| Simpurity | ≤ 0.02 | |
| Cr | 9 – 10.5 | 10 |
| Cosolid-solution / matrix stabiliser | 5 – 7 | 6 |
| Nitoughness, austenite-forming balance | 0.5 – 1.5 | 1 |
| Mocreep strength | 0.4 – 1 | 0.7 |
| VMX carbonitride precipitation | 0.1 – 0.3 | 0.2 |
| Nboptional microalloy | ≤ 0.2 | 0.08 |
| N | 0.02 – 0.07 | 0.04 |
| Fe | balance |
What surface finishes work on 1.4911?
Passivate or nitride for wear/oxidation service; steam-oxide, aluminide or thermal-barrier coatings used on turbine components; not anodisable.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 1.4911 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X8CrCoNiMo10-6
How much does 1.4911 cost?
1.4911 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4911 — frequently asked
What is 1.4911 used for?
1.4911 is typically used for steam turbine blades and rotors, gas turbine components and high-temperature fasteners. In short: cobalt-strengthened 10Cr steel; 760 MPa yield at 600 °C class; forging-grade turbine alloy.
What is the yield strength of 1.4911?
1.4911 has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 94% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4911 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machine in the annealed or as-quench-and-tempered state with rigid setups, sharp carbide (coated) tools, moderate speed and heavy positive feed to avoid work hardening; grind or hard-turn after final temper.
Can 1.4911 be welded?
Not readily — weldability is rated poor (32/100). Weldable with matching or 9–12Cr filler using 250–350 °C preheat, controlled interpass and mandatory post-weld temper below the base tempering temperature to restore toughness.
What surface finishes work on 1.4911?
Passivate or nitride for wear/oxidation service; steam-oxide, aluminide or thermal-barrier coatings used on turbine components; not anodisable.
Can 1.4911 be formed, bent or molded?
Hot forge at ~1100–850 °C with slow controlled cooling to avoid quench cracks; cold forming is essentially limited to straightening.
What is the maximum service temperature of 1.4911?
1.4911 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4911 cost?
1.4911 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- DIN 17240 — Heat-resisting and creep-resisting steels for bolts and nuts — DIN (1976)
- EN 10269 — Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties — CEN (2013)
- Stahlschlüssel (Key to Steel) — Werkstoff 1.4911 X8CrCoNiMo10-6 — Verlag Stahlschlüssel Wegst (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.