Stainless Steel 1.4825-AC (Spheroidize annealed)
Heat-treated state · default condition
EN 1.4825
Standard supply condition for furnace and exhaust hardware; heat-resistant castings normally go into service as-cast.
Values for the AC condition
Other 1.4825 tempers and conditions
1.4825 is listed in 3 conditions; see the grade overview at 1.4825.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed ~1050–1100 °C, rapid cooled | Chosen when maximum room-temperature ductility/toughness or a more homogeneous, less carbide-networked structure is needed before machining or welding. | 230 | 490 | 25 | 155 HB | 2.2 % IACS |
Stress relieved | Use after heavy welding or for dimensionally critical castings to reduce residual stress without changing the as-cast strength level much. | 250 | 510 | 18 | 170 HB | 2.2 % IACS |
ACDefaultThis page Spheroidize annealed | Standard supply condition for furnace and exhaust hardware; heat-resistant castings normally go into service as-cast. | 260 | 520 | 18 | 175 HB | 2.2 % IACS |
What is 1.4825-AC?
1.4825-AC is 1.4825 heat treated to AC — standard supply condition for furnace and exhaust hardware; heat-resistant castings normally go into service as-cast. 1.4825-AC has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 185 GPa (26.8 Msi). 1.4825-AC has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- High service temperature — 900°C (1,652 °F), better than 85% of stainless steel grades
Limitations
- Hard to polish — 45/100, worse than 96% of stainless steel grades
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 88% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
1.4825-AC properties
Typical room-temperature values for 1.4825-AC; 23 are specific to this condition. Other listed values are 1.4825 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4825-AC has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4825-AC has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
1.4825-AC is rated for continuous service to 900°C (1,652 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
1.4825-AC conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4825-AC takes about 53 MJ of energy and emits 4.5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4825-AC's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability fair (45/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4825-AC
Is 1.4825 easy to machine?
Machine with rigid setups, sharp carbide (K/C-grade) tooling, low speed and heavy positive feed to cut through the interdendritic carbide network; flood coolant and avoid dwelling to limit work hardening.
Can 1.4825 be welded?
Weldable by SMAW/GTAW with 309/matching high-Si filler; preheat 150–250 °C for heavy sections, keep interpass low, and stress relieve or solution anneal afterwards to reduce hot-cracking and carbide-related embrittlement.
Can 1.4825 be formed, bent or molded?
Sand-cast only — no cold forming; design generous fillets and uniform wall thickness, use large risers and account for ~2 % solidification shrinkage plus high thermal expansion in fixture design.
What surface finishes work on 1.4825?
Shot-blast and pickle/passivate scale after casting or heat treatment; no anodizing — for severe service use aluminizing or a ceramic/alumina wash coating.
1.4825 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 for creep/strength; ASTM A297 HF allows 0.20–0.40 | 0.15 – 0.35 | 0.25 |
| Sikey oxidation-resistance addition (A297 HF: Si ≤ 2.00) | 1 – 2.5 | 1.8 |
| MnA297 HF: ≤ 2.00 | ≤ 1.5 | 1 |
| CrA297 HF: 18.0–23.0 | 17 – 19 | 18 |
| NiA297 HF: 8.0–12.0 | 8 – 10 | 9 |
| P | ≤ 0.05 | — |
| S | ≤ 0.03 | — |
| Moresidual only, not intentionally added | ≤ 0.5 | — |
| Fe | balance | — |
1.4825-AC — frequently asked
What is 1.4825-AC used for?
1.4825-AC is typically used for exhaust manifolds, furnace fixtures and heat-treatment fittings. In short: cast heat-resistant 18-9; oxidation resistance to 900 °C; sand-cast forms only.
What is the yield strength of 1.4825-AC?
1.4825-AC has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.4825-AC easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machine with rigid setups, sharp carbide (K/C-grade) tooling, low speed and heavy positive feed to cut through the interdendritic carbide network; flood coolant and avoid dwelling to limit work hardening.
Can 1.4825-AC be welded?
With care — weldability is rated fair (45/100). Weldable by SMAW/GTAW with 309/matching high-Si filler; preheat 150–250 °C for heavy sections, keep interpass low, and stress relieve or solution anneal afterwards to reduce hot-cracking and carbide-related embrittlement.
What surface finishes work on 1.4825-AC?
Shot-blast and pickle/passivate scale after casting or heat treatment; no anodizing — for severe service use aluminizing or a ceramic/alumina wash coating.
Can 1.4825-AC be formed, bent or molded?
Sand-cast only — no cold forming; design generous fillets and uniform wall thickness, use large risers and account for ~2 % solidification shrinkage plus high thermal expansion in fixture design.
What is the maximum service temperature of 1.4825-AC?
1.4825-AC 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 1.4825-AC and 1.4825-SA?
AC is the default condition — standard supply condition for furnace and exhaust hardware; heat-resistant castings normally go into service as-cast. SA: chosen when maximum room-temperature ductility/toughness or a more homogeneous, less carbide-networked structure is needed before machining or welding. Yield strength is 260 MPa in AC versus 230 MPa in SA.
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 (grade HF) — ASTM (2019)
- DIN 17465 — Heat resisting steel castings (GX25CrNiSi18-9) — DIN (1985)
- 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 oxidation of cast Cr-Ni alloys) — ASM International (2005)
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.