Stainless Steel 1.4807
EN 1.4807
1.4807 (GX40NiCrSiNb35-18, ASTM A297 HT) is the niobium-stabilized version of the 35Ni-18Cr silicon-bearing cast heat-resistant austenitic steel, supplied as-cast, centrifugally cast, solution annealed or aged.
Reference datasheet — 1.4807 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 AC condition
1.4807 tempers and conditions
1.4807 is supplied in 3 conditions, soft to hard. AC 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/diffusion annealed | Optional treatment used to homogenize the cast structure and relieve casting stresses before machining or welding of complex fabrications. | 225 | 450 | 14 | 170 HB | 1.7 % IACS |
ACDefault Spheroidize annealed | Standard delivery condition for furnace fixtures, retorts and radiant-tube components; no heat treatment required for high-temperature service. | 240 | 470 | 9 | 185 HB | 1.7 % IACS |
Thermally aged / service-exposed | Reference condition for repair or re-use assessment: secondary carbide precipitation raises strength but severely lowers RT ductility and weldability. | 300 | 500 | 3 | 17 HRC | 1.8 % IACS |
Supply forms, finishes and certifications
Ways 1.4807 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 1.4807?
1.4807 (GX40NiCrSiNb35-18, ASTM A297 HT) is the niobium-stabilized version of the 35Ni-18Cr silicon-bearing cast heat-resistant austenitic steel, supplied as-cast, centrifugally cast, solution annealed or aged. Niobium carbides raise high-temperature strength and improve carbide stability, so the grade is used for furnace fixtures, radiant tubes and kiln components operating up to 1050 °C. Room-temperature values are 240 MPa yield, 470 MPa tensile, 9 % elongation and 185 HB — the lowest ductility in this group — and the alloy is cast only, with no aqueous corrosion rating. Unstabilized 1.4806 is the lower-cost alternative. 1.4807 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F). 1.4807 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 9% and the elastic modulus is 165 GPa (23.9 Msi).
What is 1.4807 used for?
- furnace fixtures
- radiant tubes
- kiln components
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Low stiffness — 165 GPa (23.9 Msi), worse than 100% of stainless steel grades
- Limited ductility — 9%, worse than 99% of stainless steel grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of stainless steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
1.4807 properties
Typical room-temperature values for 1.4807-AC; bars are the position among stainless steel grades.
Physical3
1.4807 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical16
1.4807 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 9% and the elastic modulus is 165 GPa (23.9 Msi).
Thermal6
1.4807 is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
1.4807 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4807 takes about 72 MJ of energy and emits 5.6 kg of CO₂ — more than 83% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
1.4807's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability fair (40/100); formability not recommended (10/100).
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. 1.4807 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4807
Is 1.4807 easy to machine?
Difficult: use rigid setups, sharp carbide or ceramic tooling, low speed with heavy positive feed to cut under the hard carbide network and avoid work-hardened glazing; grinding is often preferred for finish surfaces.
Can 1.4807 be welded?
Weld with matching 35Ni-18Cr-Nb filler or a Ni-base (ERNiCr-3) consumable, preheat 150–250 °C for heavy sections, low heat input and slow cooling; aged/carburized ex-service material should be buttered or replaced rather than welded directly.
Can 1.4807 be formed, bent or molded?
Cast only — sand, investment or centrifugal casting with generous risering and fillets; no cold forming, and hot straightening should be done above ~1000 °C.
1.4807 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 carbon for carbide strengthening | 0.3 – 0.5 | 0.4 |
| Siimproves oxidation/carburization resistance | 1 – 2.5 | 1.7 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 17 – 19 | 18 |
| Ni | 33 – 36 | 35 |
| Nbstabilizer, forms NbC | 1.2 – 1.8 | 1.5 |
| Fe | balance |
What surface finishes work on 1.4807?
Shot blast or pickle to remove casting scale; not anodizable, and paint/plating is pointless in service — the alloy relies on its own adherent Cr-Si oxide scale, so parts are usually left bare or aluminized for extreme carburizing 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 1.4807 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX40NiCrSiNb35-18
- Similar grades
- A297 HT
How much does 1.4807 cost?
1.4807 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.
1.4807 — frequently asked
What is 1.4807 used for?
1.4807 is typically used for furnace fixtures, radiant tubes and kiln components. In short: nb-stabilized HT casting; best creep strength here; cast only, no forming.
What is the yield strength of 1.4807?
1.4807 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4807 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Difficult: use rigid setups, sharp carbide or ceramic tooling, low speed with heavy positive feed to cut under the hard carbide network and avoid work-hardened glazing; grinding is often preferred for finish surfaces.
Can 1.4807 be welded?
With care — weldability is rated fair (40/100). Weld with matching 35Ni-18Cr-Nb filler or a Ni-base (ERNiCr-3) consumable, preheat 150–250 °C for heavy sections, low heat input and slow cooling; aged/carburized ex-service material should be buttered or replaced rather than welded directly.
What surface finishes work on 1.4807?
Shot blast or pickle to remove casting scale; not anodizable, and paint/plating is pointless in service — the alloy relies on its own adherent Cr-Si oxide scale, so parts are usually left bare or aluminized for extreme carburizing duty.
Can 1.4807 be formed, bent or molded?
Cast only — sand, investment or centrifugal casting with generous risering and fillets; no cold forming, and hot straightening should be done above ~1000 °C.
What is the maximum service temperature of 1.4807?
1.4807 is rated for continuous use to about 1,050°C (1,922 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4807-AC and 1.4807 Aged?
AC is the default condition — standard delivery condition for furnace fixtures, retorts and radiant-tube components; no heat treatment required for high-temperature service. Aged: reference condition for repair or re-use assessment: secondary carbide precipitation raises strength but severely lowers RT ductility and weldability. Yield strength is 240 MPa in AC versus 300 MPa in Aged.
How much does 1.4807 cost?
1.4807 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 10295 – Heat resistant steel castings — CEN (2002)
- ASTM A297/A297M – Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application — ASTM (2019)
- ASM Handbook Vol. 1 – Properties and Selection: Irons, Steels, and High-Performance Alloys (Heat-Resistant Castings) — ASM International (1990)
- ASM Handbook Vol. 13B – Corrosion: Materials (High-Temperature Corrosion) — ASM International (2005)
- Steel Founders' Society of America – High Alloy Data Sheets, Heat Series — SFSA (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.