Stainless Steel 1.4905
EN 1.4905
1.4905 (X11CrMoWVNb9-11) is a 9–11% Cr martensitic heat-resistant steel alloyed with tungsten, molybdenum, vanadium and niobium for creep strength, supplied in NT, QT, A, N and AW conditions.
Reference datasheet — 1.4905 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 NT condition
1.4905 tempers and conditions
1.4905 is supplied in 5 conditions, soft to hard. NT 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 |
|---|---|---|---|---|---|---|
Solution annealed | Intermediate machining/forming condition for bar and forging stock; must be re-normalized and tempered before service. | 400 | 620 | 25 | 200 HB | — |
NTDefault normalized (1040–1090 °C) and tempered (730–780 °C) | Standard delivery condition for tubes, pipe and plate; tempered martensite giving the certified creep and impact properties. | 520 | 700 | 22 | 20 HRC | — |
Quenched and tempered | Used for thick turbine/valve forgings where accelerated cooling is needed to obtain full martensite through-section. | 560 | 750 | 20 | 22 HRC | 3 % IACS |
As-welded deposit | Condition of matching E911 weld deposits before the mandatory 750–770 °C PWHT; hard, low-toughness, never left in service. | 800 | 1,000 | 10 | 40 HRC | 2.8 % IACS |
Normalized | Transient condition after normalizing or after welding — hard and brittle; tempering at 730–780 °C is mandatory before use. | 900 | 1,250 | 10 | 43 HRC | 2.8 % IACS |
What is 1.4905?
1.4905 (X11CrMoWVNb9-11) is a 9–11% Cr martensitic heat-resistant steel alloyed with tungsten, molybdenum, vanadium and niobium for creep strength, supplied in NT, QT, A, N and AW conditions. Engineers specify it for steam-side pressure parts, forged rotors, tube and heavy plate running to about 600 °C, with 520 MPa yield, 700 MPa tensile and 22% elongation in the default condition. It is a steam-oxidation grade rather than a wet-corrosion stainless, and every weld needs preheat plus a mandatory post-weld temper. Where lower creep strength is acceptable, 1.4922 (X20CrMoV11-1) is the simpler alternative. 1.4905 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,420°C (2,588 °F). 1.4905 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 218 GPa (31.6 Msi).
What is 1.4905 used for?
- steam turbine rotors
- boiler tubes and headers
- high-temperature bolting
- power plant piping
Advantages
- Low embodied carbon — 2.9 kg CO₂/kg, better than 98% of stainless steel grades
- Conducts heat well — 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades
- High electrical conductivity — 3 % IACS, better than 95% of stainless steel grades
- High strength — 520 MPa (75.4 ksi), better than 79% of stainless steel grades
Limitations
- Needs corrosion protection — 30/100, worse than 99% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
1.4905 properties
Typical room-temperature values for 1.4905-NT; bars are the position among stainless steel grades.
Physical3
1.4905 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
1.4905 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 79% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 218 GPa (31.6 Msi).
Thermal6
1.4905 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
1.4905 conducts electricity at 3 % IACS, better than 95% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), worse than 99% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4905 takes about 36 MJ of energy and emits 2.9 kg of CO₂ — less than 99% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
1.4905's machinability is fair (35/100, better than 51% of stainless steel grades); weldability fair (40/100); 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. 1.4905 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4905
Is 1.4905 easy to machine?
Machine in the annealed or tempered condition with rigid setups, sharp carbide tooling, low speed/high feed and copious coolant — work-hardening and poor chip-breaking make it slower than plain alloy steel.
Can 1.4905 be welded?
Use matching E911/9Cr-1Mo-W consumables with 200–300 °C preheat/interpass, control interpass below ~350 °C, cool to ~100 °C before the mandatory 750–770 °C PWHT to restore toughness.
Can 1.4905 be formed, bent or molded?
Hot form at 1100–900 °C followed by full re-normalizing and tempering; cold bending is limited and requires post-form stress relief.
1.4905 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 |
|---|---|---|
| C | 0.09 – 0.13 | 0.11 |
| Si | 0.1 – 0.5 | 0.2 |
| Mn | 0.3 – 0.6 | 0.45 |
| P | ≤ 0.02 | |
| S | ≤ 0.01 | |
| Cr | 8.5 – 9.5 | 9 |
| Mo | 0.9 – 1.1 | 1 |
| W | 0.9 – 1.1 | 1 |
| V | 0.18 – 0.25 | 0.22 |
| Nb | 0.06 – 0.1 | 0.08 |
| N | 0.05 – 0.09 | 0.07 |
| Ni | ≤ 0.4 | 0.2 |
| Almax, soluble Al | ≤ 0.02 | |
| Bmax (residual) | ≤ 5×10⁻⁴ | |
| Fe | balance |
What surface finishes work on 1.4905?
Not corrosion resistant in wet service — protect with paint, aluminizing or chromizing; pickle/passivate only per boiler-cleaning practice.
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 1.4905 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X11CrMoWVNb9-11
How much does 1.4905 cost?
1.4905 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.
1.4905 — frequently asked
What is 1.4905 used for?
1.4905 is typically used for steam turbine rotors, boiler tubes and headers, high-temperature bolting and power plant piping. In short: 9Cr creep-resistant steel; 600 °C steam service; mandatory post-weld heat treatment.
What is the yield strength of 1.4905?
1.4905 has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 79% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4905 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machine in the annealed or tempered condition with rigid setups, sharp carbide tooling, low speed/high feed and copious coolant — work-hardening and poor chip-breaking make it slower than plain alloy steel.
Can 1.4905 be welded?
With care — weldability is rated fair (40/100). Use matching E911/9Cr-1Mo-W consumables with 200–300 °C preheat/interpass, control interpass below ~350 °C, cool to ~100 °C before the mandatory 750–770 °C PWHT to restore toughness.
What surface finishes work on 1.4905?
Not corrosion resistant in wet service — protect with paint, aluminizing or chromizing; pickle/passivate only per boiler-cleaning practice.
Can 1.4905 be formed, bent or molded?
Hot form at 1100–900 °C followed by full re-normalizing and tempering; cold bending is limited and requires post-form stress relief.
What is the maximum service temperature of 1.4905?
1.4905 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.
What is the difference between 1.4905-NT and 1.4905-N?
NT is the default condition — standard delivery condition for tubes, pipe and plate; tempered martensite giving the certified creep and impact properties. N: transient condition after normalizing or after welding — hard and brittle; tempering at 730–780 °C is mandatory before use. Yield strength is 520 MPa in NT versus 900 MPa in N.
How much does 1.4905 cost?
1.4905 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
- EN 10216-2 — Seamless steel tubes for pressure purposes, non-alloy and alloy steels with specified elevated temperature properties — CEN (2020)
- EN 10222-2 — Steel forgings for pressure purposes, ferritic and martensitic steels for elevated temperature — CEN (2017)
- VdTÜV-Werkstoffblatt 522 — X11CrMoWVNb9-1 (E911) — VdTÜV (2004)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Creep-strength enhanced ferritic (CSEF) steel property compilations for P91/P92/E911 — EPRI / ECCC (2018)
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.