Stainless Steel 1.4558
EN 1.4558 · UNS N08800 · also Incoloy 800
1.4558 (X2NiCrAlTi32-20, N08800, Incoloy 800) is a Ni-Cr-Fe alloy stabilized with aluminium and titanium for oxidation and carburization resistance and structural stability at elevated temperature.
Reference datasheet — 1.4558 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 ANN condition
1.4558 tempers and conditions
1.4558 is supplied in 5 conditions, soft to hard. ANN 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 |
|---|---|---|---|---|---|---|
High-temperature solution annealed | Use for long-term creep service above 600 °C (furnace tubes, radiant tubes, reformers) where rupture strength governs. | 195 | 510 | 45 | 120 HB | 1.7 % IACS |
flanges, valve bodies, thick sections | For heavy forged fittings and tube sheets requiring ASTM B564 / EN 10222-5 style properties. | 230 | 530 | 40 | 138 HB | 1.7 % IACS |
ANNDefault Annealed | Standard stocked condition for plate, bar, tube and fittings up to ~600 °C service and for all corrosion service. | 240 | 550 | 42 | 140 HB | — |
As-welded deposit | Reference properties for fabricated weldments used without post-weld solution anneal. | 270 | 550 | 30 | 170 HB | 1.6 % IACS |
Cold drawn | Pick when higher room-temperature strength, closer tolerance and better chip control are needed; not for creep service. | 480 | 690 | 22 | 200 HB | — |
Supply forms, finishes and certifications
Ways 1.4558 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CRA | Cold Rolled, Annealed sheet/strip | Surface finish |
HRAP | Hot Rolled, Annealed & Pickled | Surface finish |
What is 1.4558?
1.4558 (X2NiCrAlTi32-20, N08800, Incoloy 800) is a Ni-Cr-Fe alloy stabilized with aluminium and titanium for oxidation and carburization resistance and structural stability at elevated temperature. Annealed material gives about 240 MPa yield, 550 MPa tensile, 42 % elongation and 140 HB with service to 800 °C, supplied as hot-rolled pickled and cold-rolled sheet, plate, cold-drawn bar, tube and forgings. Weldability is good (80) and cold formability workable (75), but machinability is low (30) and aqueous chloride pitting resistance (70) sits below the molybdenum-bearing superaustenitics such as 904L. 1.4558 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F). 1.4558 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
What is 1.4558 used for?
- heat treatment furnace fixtures
- petrochemical cracking tubes
- steam generator components
- high-temperature heat exchangers
Advantages
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
- Readily welded — 80/100, better than 80% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
- High embodied carbon — 7 kg CO₂/kg, worse than 96% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
1.4558 properties
Typical room-temperature values for 1.4558-ANN; bars are the position among stainless steel grades.
Physical3
1.4558 has a density of 7.94 g/cm³ (0.287 lb/in³), heavier than 78% of stainless steel grades. It melts at 1,357°C (2,475 °F).
Mechanical13
1.4558 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
1.4558 is rated for continuous service to 800°C (1,472 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
1.4558 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4558 takes about 90 MJ of energy and emits 7 kg of CO₂ — more than 94% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
1.4558's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (80/100); formability very good (75/100).
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. 1.4558 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4558
Is 1.4558 easy to machine?
Work-hardens fast and is gummy — use rigid setups, positive-rake carbide, heavy feeds with slow speed (20–30 m/min), continuous cut and flood coolant to avoid glazing.
Can 1.4558 be welded?
Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Inconel 82) or ENiCrFe-3 fillers; keep interpass temperature low, no preheat and normally no PWHT, avoid heavy heat input to limit Ti-carbide sensitization.
Can 1.4558 be formed, bent or molded?
Good cold formability but ~1.5× the forming loads of 304; interstage annealing at 980–1050 °C after 40–50 % reduction; hot work 900–1200 °C with rapid cooling from the finishing temperature.
1.4558 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 |
|---|---|---|
| Clow-carbon variant of Alloy 800; 1.4876/800H allow higher C | ≤ 0.03 | 0.02 |
| Si | ≤ 0.7 | 0.4 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Cr | 19 – 23 | 21 |
| NiN08800 range 30.0–35.0 | 30 – 34 | 32 |
| Alwith Ti gives oxidation/carburization resistance | 0.15 – 0.6 | 0.35 |
| Ticarbide stabilizer | 0.15 – 0.6 | 0.4 |
| CuASTM B409 limit | ≤ 0.75 | 0.2 |
| Fe≥ 39.5 % per UNS N08800 | balance |
What surface finishes work on 1.4558?
Not anodizable — pickle in HNO3/HF then passivate, or electropolish; grinding/blasting media must be iron-free to preserve the oxidation-resistant surface.
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 1.4558 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N08800
- EN / DIN / Werkstoff-Nr.
- X2NiCrAlTi32-20
- Trade names
- Incoloy 800
How much does 1.4558 cost?
1.4558 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.
1.4558 — frequently asked
What is 1.4558 used for?
1.4558 is typically used for heat treatment furnace fixtures, petrochemical cracking tubes, steam generator components and high-temperature heat exchangers. In short: high-temperature superaustenitic; oxidation and carburization resistant; weldable to 800 °C service.
What is the yield strength of 1.4558?
1.4558 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4558 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Work-hardens fast and is gummy — use rigid setups, positive-rake carbide, heavy feeds with slow speed (20–30 m/min), continuous cut and flood coolant to avoid glazing.
Can 1.4558 be welded?
Yes — weldability is rated very good (80/100). Readily welded by GTAW/GMAW/SMAW with ERNiCr-3 (Inconel 82) or ENiCrFe-3 fillers; keep interpass temperature low, no preheat and normally no PWHT, avoid heavy heat input to limit Ti-carbide sensitization.
What surface finishes work on 1.4558?
Not anodizable — pickle in HNO3/HF then passivate, or electropolish; grinding/blasting media must be iron-free to preserve the oxidation-resistant surface.
Can 1.4558 be formed, bent or molded?
Good cold formability but ~1.5× the forming loads of 304; interstage annealing at 980–1050 °C after 40–50 % reduction; hot work 900–1200 °C with rapid cooling from the finishing temperature.
What is the maximum service temperature of 1.4558?
1.4558 is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4558-ANN and 1.4558-CD?
ANN is the default condition — standard stocked condition for plate, bar, tube and fittings up to ~600 °C service and for all corrosion service. CD: pick when higher room-temperature strength, closer tolerance and better chip control are needed; not for creep service. Yield strength is 240 MPa in ANN versus 480 MPa in CD.
How much does 1.4558 cost?
1.4558 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 10095 Heat resisting steels and nickel alloys — CEN (1999)
- EN 10028-7 / EN 10216-5 (X2NiCrAlTi32-20, 1.4558) — CEN (2016)
- ASTM B409 / B408 / B407 / B564 (UNS N08800) — ASTM International (2020)
- INCOLOY alloy 800 technical bulletin — Special Metals Corporation (2004)
- VDM Alloy 800 / Nicrofer 3220 material data sheet — VDM Metals (2018)
- ASM Handbook Vol. 1 & Vol. 13B (heat-resistant Fe-Ni-Cr alloys) — 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.