Stainless Steel 1.4806-AC (Spheroidize annealed)
Heat-treated state · default condition
EN 1.4806
Standard supply condition for furnace fixtures, trays and baskets — heat-resistant castings are normally used as-cast.
Values for the AC condition
Other 1.4806 tempers and conditions
1.4806 is listed in 3 conditions; see the grade overview at 1.4806.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed ~1050–1150 °C, air cooled | Optional homogenising/stress-relief treatment used when machining allowance is large or dimensional stability before service is required. | 235 | 450 | 14 | 170 HB | 1.7 % IACS |
ACDefaultThis page Spheroidize annealed | Standard supply condition for furnace fixtures, trays and baskets — heat-resistant castings are normally used as-cast. | 250 | 470 | 10 | 180 HB | 1.7 % IACS |
Thermally aged / service-exposed | Reference condition for life assessment: secondary carbide precipitation raises hardness and strength but strongly reduces room-temperature ductility and impact energy. | 300 | 500 | 4 | 15 HRC | 1.8 % IACS |
What is 1.4806-AC?
1.4806-AC is 1.4806 heat treated to AC — standard supply condition for furnace fixtures, trays and baskets — heat-resistant castings are normally used as-cast. 1.4806-AC has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 168 GPa (24.4 Msi). 1.4806-AC has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Low stiffness — 168 GPa (24.4 Msi), worse than 100% of stainless steel grades
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of stainless steel grades
- Hard to polish — 45/100, worse than 96% of stainless steel grades
- Limited formability — 10/100, worse than 95% of stainless steel grades
1.4806-AC properties
Typical room-temperature values for 1.4806-AC; 22 are specific to this condition. Other listed values are 1.4806 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4806-AC has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,330°C (2,426 °F).
Mechanical16
1.4806-AC has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 91% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 168 GPa (24.4 Msi).
Thermal6
1.4806-AC 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 µm/m·K (8.33 µin/in·°F).
Electrical3
1.4806-AC conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4806-AC takes about 72 MJ of energy and emits 5.5 kg of CO₂ — more than 83% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4806-AC's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability fair (40/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4806-AC
Is 1.4806 easy to machine?
Difficult: hard eutectic carbides and a work-hardening austenite matrix — use rigid setups, positive-rake carbide or ceramic inserts, 15–35 m/min, heavy feed, flood coolant and avoid dwelling.
Can 1.4806 be welded?
Weld with matching 35Ni-17Cr or Ni-base (ERNiCr-3/AWS ENiCrFe) filler, preheat 150–300 °C, low heat input and slow cooling; service-aged parts are highly crack-prone and should be buttered or locally solution treated.
Can 1.4806 be formed, bent or molded?
Cast-only grade: sand, shell or investment cast for fixtures and centrifugally cast for tubes; design generous fillets and uniform sections because low RT ductility offers little tolerance for casting stress.
What surface finishes work on 1.4806?
Normally supplied shot-blasted or as-cast with the protective Cr/Si oxide scale intact; grind only where dimensionally needed, avoid plating or painting, and never use S-containing marking or cutting compounds before high-temperature service.
1.4806 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 |
|---|---|---|
| CASTM HT allows 0.35–0.75 | 0.3 – 0.5 | 0.4 |
| SiSi improves oxidation/carburization resistance | 1 – 2.5 | 1.8 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 16 – 19 | 17.5 |
| Ni | 33 – 37 | 35 |
| Moresidual limit | ≤ 0.5 | — |
| Fe | balance | — |
1.4806-AC — frequently asked
What is 1.4806-AC used for?
1.4806-AC is typically used for furnace rollers and fixtures, heat-treatment trays and radiant tube supports. In short: 35Ni carburization resistance; thermal cycling furnace castings; cast only, low ductility.
What is the yield strength of 1.4806-AC?
1.4806-AC has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 91% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4806-AC easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Difficult: hard eutectic carbides and a work-hardening austenite matrix — use rigid setups, positive-rake carbide or ceramic inserts, 15–35 m/min, heavy feed, flood coolant and avoid dwelling.
Can 1.4806-AC be welded?
With care — weldability is rated fair (40/100). Weld with matching 35Ni-17Cr or Ni-base (ERNiCr-3/AWS ENiCrFe) filler, preheat 150–300 °C, low heat input and slow cooling; service-aged parts are highly crack-prone and should be buttered or locally solution treated.
What surface finishes work on 1.4806-AC?
Normally supplied shot-blasted or as-cast with the protective Cr/Si oxide scale intact; grind only where dimensionally needed, avoid plating or painting, and never use S-containing marking or cutting compounds before high-temperature service.
Can 1.4806-AC be formed, bent or molded?
Cast-only grade: sand, shell or investment cast for fixtures and centrifugally cast for tubes; design generous fillets and uniform sections because low RT ductility offers little tolerance for casting stress.
What is the maximum service temperature of 1.4806-AC?
1.4806-AC 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 1.4806-AC and 1.4806 Aged?
AC is the default condition — standard supply condition for furnace fixtures, trays and baskets — heat-resistant castings are normally used as-cast. Aged: reference condition for life assessment: secondary carbide precipitation raises hardness and strength but strongly reduces room-temperature ductility and impact energy. Yield strength is 250 MPa in AC versus 300 MPa in Aged.
Sources
- EN 10295 — Heat resistant steel castings — CEN (2002)
- ASTM A297/A297M — Steel Castings, Iron-Chromium-Nickel, Heat Resistant, for General Application — ASTM (2019)
- ASTM A608/A608M — Centrifugally Cast Iron-Chromium-Nickel High-Alloy Tubing for Pressure Application at High Temperatures — ASTM (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (heat-resistant castings) — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America (1995)
- Heat-resistant furnace alloy castings (HT / GX40NiCrSi35-17) datasheets — various foundries (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.