Stainless Steel 1.4971
EN 1.4971
1.4971 (X12CrCoNi21-20) is a cobalt-bearing austenitic heat-resistant steel used for high-temperature strength and oxidation resistance in gas turbine and furnace hardware up to about 900 °C.
Reference datasheet — 1.4971 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 SA condition
1.4971 tempers and conditions
1.4971 is supplied in 5 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard stocked condition for sheet, bar and forgings: maximum ductility and creep-rupture performance for long-term high-temperature service. | 400 | 815 | 45 | 190 HB | — |
Hot rolled | Mill condition for heavy bar and forgings before final solution treatment; use only where a subsequent heat treatment is planned. | 470 | 860 | 35 | 17 HRC | 1.9 % IACS |
Solution annealed and aged | Pick when higher room- and mid-temperature strength/hardness is needed (turbine bolting, discs); carbide/nitride precipitation costs ductility and impact toughness. | 620 | 1,000 | 25 | 27 HRC | — |
Cold drawn | Cold-finished bar and fastener wire: raised yield strength and better surface/tolerance, but residual cold work limits long-term use above ~600 °C. | 750 | 1,000 | 20 | 26 HRC | 1.9 % IACS |
Cold worked and stress-relieved/aged | Highest-strength commercial condition, used for hot-service studs and bolts where relaxation resistance to ~700 °C matters. | 900 | 1,150 | 15 | 32 HRC | 1.9 % IACS |
What is 1.4971?
1.4971 (X12CrCoNi21-20) is a cobalt-bearing austenitic heat-resistant steel used for high-temperature strength and oxidation resistance in gas turbine and furnace hardware up to about 900 °C. Conditions on file cover solution annealed, solution annealed plus aged, hot rolled, cold drawn and cold worked plus aged; default values are 400 MPa yield, 815 MPa tensile, 45 % elongation and 190 HB (90 HRB). It behaves like a superalloy in the shop — machinability 25/100, formability 55/100, weldability 60/100 — and the cobalt content makes it costly and slow to source. For furnace hardware at lower temperature, 1.4981 or 310S is the cheaper route. 1.4971 has a density of 8.19 g/cm³ (0.296 lb/in³), heavier than 100% of stainless steel grades. It melts at 1,300°C (2,372 °F). 1.4971 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 815 MPa (118 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4971 used for?
- gas turbine casings
- furnace fixtures
- high-temperature fasteners
Advantages
- High service temperature — 900°C (1,652 °F), better than 85% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- High embodied carbon — 9.5 kg CO₂/kg, worse than 100% of stainless steel grades
- Poor heat conductor — 12.4 W/m·K (7.16 BTU/hr·ft·°F), worse than 91% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.4971 properties
Typical room-temperature values for 1.4971-SA; bars are the position among stainless steel grades.
Physical3
1.4971 has a density of 8.19 g/cm³ (0.296 lb/in³), heavier than 100% of stainless steel grades. It melts at 1,300°C (2,372 °F).
Mechanical13
1.4971 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 815 MPa (118 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
1.4971 is rated for continuous service to 900°C (1,652 °F). It conducts heat at 12.4 W/m·K (7.16 BTU/hr·ft·°F), worse than 91% of stainless steel grades. Thermal expansion is 15.7 µm/m·K (8.72 µin/in·°F).
Electrical3
1.4971 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4971 takes about 110 MJ of energy and emits 9.5 kg of CO₂ — more than 99% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
1.4971's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (60/100); formability good (55/100).
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. 1.4971 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4971
Is 1.4971 easy to machine?
Treat as a superalloy: rigid setups, sharp positive-rake carbide or ceramic tooling, low surface speed with heavy feed, flood coolant, and avoid dwelling — the alloy work-hardens rapidly and galls.
Can 1.4971 be welded?
GTAW/GMAW with matching N-155 (or Haynes 556/inconel-type) filler; clean joints, low heat input, no preheat needed, and re-solution treat heavily welded assemblies to restore creep properties.
Can 1.4971 be formed, bent or molded?
Hot work at 1050–1180 °C and finish above ~950 °C; cold forming needs 2–3× the force of 304 with frequent 1175 °C intermediate anneals.
1.4971 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 | 0.08 – 0.16 | 0.12 |
| Si | ≤ 0.75 | 0.4 |
| Mn | 1 – 2 | 1.5 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 20 – 22.5 | 21 |
| Ni | 19 – 21 | 20 |
| Co | 18.5 – 21 | 20 |
| Mo | 2.5 – 3.5 | 3 |
| W | 2 – 3 | 2.5 |
| NbNb (+Ta) | 0.75 – 1.25 | 1 |
| Nsolid-solution/nitride strengthening | 0.1 – 0.2 | 0.15 |
| Febalance, ≈30 % | balance |
What surface finishes work on 1.4971?
Pickle/passivate or bead blast after hot working; not anodizable — use aluminide, MCrAlY or ceramic thermal-barrier coatings for the hottest oxidation/sulfidation duty.
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 1.4971 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X12CrCoNi21-20
How much does 1.4971 cost?
1.4971 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.
1.4971 — frequently asked
What is 1.4971 used for?
1.4971 is typically used for gas turbine casings, furnace fixtures and high-temperature fasteners. In short: cobalt austenitic, 900 °C; highest hot strength on file; superalloy-like machining.
What is the yield strength of 1.4971?
1.4971 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 815 MPa (118 ksi) — stronger than 57% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4971 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Treat as a superalloy: rigid setups, sharp positive-rake carbide or ceramic tooling, low surface speed with heavy feed, flood coolant, and avoid dwelling — the alloy work-hardens rapidly and galls.
Can 1.4971 be welded?
Yes — weldability is rated good (60/100). GTAW/GMAW with matching N-155 (or Haynes 556/inconel-type) filler; clean joints, low heat input, no preheat needed, and re-solution treat heavily welded assemblies to restore creep properties.
What surface finishes work on 1.4971?
Pickle/passivate or bead blast after hot working; not anodizable — use aluminide, MCrAlY or ceramic thermal-barrier coatings for the hottest oxidation/sulfidation duty.
Can 1.4971 be formed, bent or molded?
Hot work at 1050–1180 °C and finish above ~950 °C; cold forming needs 2–3× the force of 304 with frequent 1175 °C intermediate anneals.
What is the maximum service temperature of 1.4971?
1.4971 is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4971-SA and 1.4971-CD?
SA is the default condition — standard stocked condition for sheet, bar and forgings: maximum ductility and creep-rupture performance for long-term high-temperature service. CD: cold-finished bar and fastener wire: raised yield strength and better surface/tolerance, but residual cold work limits long-term use above ~600 °C. Yield strength is 400 MPa in SA versus 750 MPa in CD.
How much does 1.4971 cost?
1.4971 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-resistant steels for bolts and nuts (X12CrCoNi21-20, 1.4971) — DIN (1976)
- AMS 5769 / AMS 5794 — Alloy N-155 (UNS R30155) bar, sheet and strip — SAE International (2019)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Multimet / N-155 (R30155) alloy datasheet — Haynes International / specialty alloy producers (2020)
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.