Stainless Steel 1.4805
EN 1.4805
1.4805 (GX35NiCrSi25-21, ASTM A297 HN) is a high-silicon 25Cr-21Ni cast heat-resistant austenitic steel supplied as-cast (F), aged, solution annealed or centrifugally cast.
Reference datasheet — 1.4805 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 F condition
1.4805 tempers and conditions
1.4805 is supplied in 3 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed ~1150 °C, rapid cooled | Optional treatment to dissolve part of the carbide network and restore ductility/machinability before heavy machining or welding. | 240 | 460 | 18 | 150 HB | 1.8 % IACS |
FDefault As fabricated | Standard supply condition for furnace hardware; best combination of room-temperature ductility and creep strength. | 260 | 470 | 13 | 165 HB | — |
24 h at 760 °C, air cooled | Represents the embrittled condition after exposure in service; use these values for design of components that must survive thermal cycling. | 275 | 495 | 8 | 190 HB | — |
Supply forms, finishes and certifications
Ways 1.4805 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CC | Centrifugally cast | Surface finish |
What is 1.4805?
1.4805 (GX35NiCrSi25-21, ASTM A297 HN) is a high-silicon 25Cr-21Ni cast heat-resistant austenitic steel supplied as-cast (F), aged, solution annealed or centrifugally cast. It is used for furnace and combustion hardware that must resist scaling and repeated heating up to 1090 °C, normally as sand, investment or centrifugal castings. Room-temperature values are 260 MPa yield, 470 MPa tensile, 13 % elongation and 165 HB (85 HRB); ductility is low and machinability is about 22, the lowest in this group. It is a heat-resisting grade, not an aqueous corrosion grade; for higher carburization resistance step up to the 35Ni grades 1.4806 or 1.4807. 1.4805 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,300°C (2,372 °F). 1.4805 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 13% and the elastic modulus is 185 GPa (26.8 Msi).
What is 1.4805 used for?
- furnace fixtures
- heat-treatment baskets
- combustion equipment
Advantages
- High service temperature — 1,090°C (1,994 °F), better than 93% of stainless steel grades
Limitations
- Limited formability — 5/100, worse than 99% of stainless steel grades
- Hard to polish — 40/100, worse than 99% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Limited ductility — 13%, worse than 93% of stainless steel grades
- Poor heat conductor — 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades
1.4805 properties
Typical room-temperature values for 1.4805-F; bars are the position among stainless steel grades.
Physical3
1.4805 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,300°C (2,372 °F).
Mechanical12
1.4805 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 13% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1.4805 is rated for continuous service to 1,090°C (1,994 °F). It conducts heat at 12.5 W/m·K (7.22 BTU/hr·ft·°F), worse than 90% of stainless steel grades. Thermal expansion is 15 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4805 conducts electricity at 1.8 % IACS, worse than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4805 takes about 68 MJ of energy and emits 5.2 kg of CO₂ — more than 80% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4805's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability fair (45/100); formability not recommended (5/100).
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. 1.4805 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4805
Is 1.4805 easy to machine?
Machine with rigid setups, sharp carbide (or ceramic for finish) tooling, low speed and heavy positive feed to cut under the work-hardened skin; interrupted cuts on the carbide network cause rapid edge chipping.
Can 1.4805 be welded?
Weld with matching HN or 25Cr-20Ni (ER310/E310-15) filler, preheat 150–260 °C on heavy sections, low heat input and stress-relieve or slow-cool; aged/service-exposed material should be re-solution-annealed before repair welding.
Can 1.4805 be formed, bent or molded?
Sand, investment or centrifugal casting only — no cold or hot forming; provide generous fillets, uniform sections and feeders because solidification shrinkage and hot tearing risk are high.
1.4805 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 |
|---|---|---|
| Chigh C gives carbide strengthening / creep strength | 0.2 – 0.5 | 0.35 |
| SiA297 HN allows Si ≤ 2.00; EN designation implies deliberate Si addition for scaling resistance | 1 – 2.5 | 1.6 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | |
| S | ≤ 0.04 | |
| Cr | 19 – 23 | 21 |
| Ni | 23 – 27 | 25 |
| Moresidual only | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on 1.4805?
Shot blast and pickle/passivate to remove casting scale; not anodizable — for extreme carburising service consider aluminising or ceramic wash coating, and avoid heavy polishing since carbides pull out.
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 1.4805 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX35NiCrSi25-21
- Similar grades
- A297 HN
How much does 1.4805 cost?
1.4805 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.
1.4805 — frequently asked
What is 1.4805 used for?
1.4805 is typically used for furnace fixtures, heat-treatment baskets and combustion equipment. In short: 1090 °C service casting; high-silicon scaling resistance; hardest machining in group.
What is the yield strength of 1.4805?
1.4805 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4805 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machine with rigid setups, sharp carbide (or ceramic for finish) tooling, low speed and heavy positive feed to cut under the work-hardened skin; interrupted cuts on the carbide network cause rapid edge chipping.
Can 1.4805 be welded?
With care — weldability is rated fair (45/100). Weld with matching HN or 25Cr-20Ni (ER310/E310-15) filler, preheat 150–260 °C on heavy sections, low heat input and stress-relieve or slow-cool; aged/service-exposed material should be re-solution-annealed before repair welding.
What surface finishes work on 1.4805?
Shot blast and pickle/passivate to remove casting scale; not anodizable — for extreme carburising service consider aluminising or ceramic wash coating, and avoid heavy polishing since carbides pull out.
Can 1.4805 be formed, bent or molded?
Sand, investment or centrifugal casting only — no cold or hot forming; provide generous fillets, uniform sections and feeders because solidification shrinkage and hot tearing risk are high.
What is the maximum service temperature of 1.4805?
1.4805 is rated for continuous use to about 1,090°C (1,994 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4805-F and 1.4805-SA?
F is the default condition — standard supply condition for furnace hardware; best combination of room-temperature ductility and creep strength. SA: optional treatment to dissolve part of the carbide network and restore ductility/machinability before heavy machining or welding. Yield strength is 260 MPa in F versus 240 MPa in SA.
How much does 1.4805 cost?
1.4805 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
- ASTM A297/A297M — Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application (grade HN) — ASTM International (2020)
- EN 10295 — Heat resistant steel castings — CEN (2002)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Heat-Resistant Castings) — ASM International (1990)
- Steel Castings Handbook, Supplement 9 — High Alloy Data Sheets, Heat Series — Steel Founders' Society of America (2004)
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.