Stainless Steel CF10-AC (Spheroidize annealed)
Heat-treated state
ASTM CF10 · UNS J92590
Only for non-pressure, non-critical parts; carbides remain at grain boundaries so corrosion resistance and ductility are reduced.
Values for the AC condition
Other CF10 tempers and conditions
CF10 is listed in 3 conditions; see the grade overview at CF10.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution Annealed | Standard supply condition for all CF10 pressure-containing castings; maximum ductility and corrosion resistance. | 260 | 530 | 50 | 145 HB | — |
ACThis page Spheroidize annealed | Only for non-pressure, non-critical parts; carbides remain at grain boundaries so corrosion resistance and ductility are reduced. | 270 | 500 | 25 | 160 HB | 2.2 % IACS |
Centrifugally Cast + Solution Annealed | Choose for pipe and cylindrical sections where the denser, directionally solidified structure raises strength and soundness. | 275 | 550 | 45 | 150 HB | 2.2 % IACS |
What is CF10-AC?
CF10-AC is CF10 heat treated to AC — only for non-pressure, non-critical parts; carbides remain at grain boundaries so corrosion resistance and ductility are reduced. CF10-AC has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 193 GPa (28 Msi). CF10-AC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F). SA is the default condition FabDigit quotes; AC is available on request or by drawing note.
Limitations
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Low strength — 270 MPa (39.2 ksi), worse than 79% of stainless steel grades
CF10-AC properties
Typical room-temperature values for CF10-AC; 22 are specific to this condition. Other listed values are CF10 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CF10-AC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
CF10-AC has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 25% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
CF10-AC is rated for continuous service to 600°C (1,112 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), better than 58% of stainless steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
CF10-AC conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of CF10-AC takes about 55 MJ of energy and emits 4.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 75%.
Manufacturability8
CF10-AC's machinability is fair (35/100, better than 51% of stainless steel grades); weldability fair (40/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CF10-AC
Is CF10 easy to machine?
Gummy and work-hardening like 304 — use rigid setups, positive-rake carbide, heavy feeds, flood coolant, and avoid dwelling; expect ~45% of AISI 1212.
Can CF10 be welded?
Weld with 308/308L filler and low heat input; ferrite resists hot cracking, but the 0.04–0.10% C makes post-weld solution annealing advisable for corrosive service.
Can CF10 be formed, bent or molded?
Sand or investment cast with good fluidity and 2.0–2.3% shrink allowance; delta ferrite limits hot tearing but keep sections uniform and feed heavy junctions.
What surface finishes work on CF10?
Passivate (ASTM A967 nitric or citric) or electropolish after machining; shot blast and pickle to remove casting scale — no anodizing on ferrous alloys.
CF10 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 |
|---|---|---|
| Chigher than CF3/CF8; sensitization risk | 0.04 – 0.1 | 0.07 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 2 | 1.2 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.02 |
| Cr | 18 – 21 | 19.5 |
| Ni | 8 – 11 | 9.5 |
| MoA351 residual limit where Mo is not intentionally added | ≤ 0.5 | 0.2 |
| Fe | balance | — |
CF10-AC — frequently asked
What is CF10-AC used for?
CF10-AC is typically used for valve bodies, pump parts and general corrosion-resistant castings. In short: higher-carbon CF8 variant; ductile general-purpose casting; 700 °C service limit.
What is the yield strength of CF10-AC?
CF10-AC has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 79% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CF10-AC easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Gummy and work-hardening like 304 — use rigid setups, positive-rake carbide, heavy feeds, flood coolant, and avoid dwelling; expect ~45% of AISI 1212.
Can CF10-AC be welded?
With care — weldability is rated fair (40/100). Weld with 308/308L filler and low heat input; ferrite resists hot cracking, but the 0.04–0.10% C makes post-weld solution annealing advisable for corrosive service.
What surface finishes work on CF10-AC?
Passivate (ASTM A967 nitric or citric) or electropolish after machining; shot blast and pickle to remove casting scale — no anodizing on ferrous alloys.
Can CF10-AC be formed, bent or molded?
Sand or investment cast with good fluidity and 2.0–2.3% shrink allowance; delta ferrite limits hot tearing but keep sections uniform and feed heavy junctions.
What is the maximum service temperature of CF10-AC?
CF10-AC is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CF10-SA and CF10 CENT-SA?
SA is the default condition — standard supply condition for all CF10 pressure-containing castings; maximum ductility and corrosion resistance. CENT-SA: choose for pipe and cylindrical sections where the denser, directionally solidified structure raises strength and soundness. Yield strength is 260 MPa in SA versus 275 MPa in CENT-SA.
Sources
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts — ASTM International (2018)
- ASTM A743/A743M — Castings, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2021)
- ASTM A451/A451M — Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service — ASTM International (2021)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- Alloy Casting Institute (ACI) CF-series designation data — SFSA (2020)
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.