Stainless Steel CF10MC-AC (Spheroidize annealed)
Heat-treated state
ASTM CF10MC · UNS J92971
Only for non-code, non-corrosive structural castings — grain-boundary carbides lower ductility and intergranular corrosion resistance.
Values for the AC condition
Other CF10MC tempers and conditions
CF10MC is listed in 3 conditions; see the grade overview at CF10MC.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed ≥1040 °C, water quenched | Standard supply condition for all pressure-containing castings: maximum ductility, dissolved chromium carbides, Nb held for later stabilization. | 250 | 530 | 38 | 150 HB | — |
SA + stabilization anneal | Optional extra stabilizing soak that ties carbon up as NbC before service; chosen for long-term 450–800 °C or severe intergranular-corrosion duty. | 255 | 520 | 34 | 155 HB | 2.2 % IACS |
ACThis page Spheroidize annealed | Only for non-code, non-corrosive structural castings — grain-boundary carbides lower ductility and intergranular corrosion resistance. | 260 | 500 | 22 | 165 HB | 2.2 % IACS |
What is CF10MC-AC?
CF10MC-AC is CF10MC heat treated to AC — only for non-code, non-corrosive structural castings — grain-boundary carbides lower ductility and intergranular corrosion resistance. CF10MC-AC has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 193 GPa (28 Msi). CF10MC-AC has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,385°C (2,525 °F). SA is the default condition FabDigit quotes; AC is available on request or by drawing note.
Limitations
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
- Low fracture toughness — 90 MPa·√m (81.9 ksi·√in), worse than 75% of stainless steel grades
CF10MC-AC properties
Typical room-temperature values for CF10MC-AC; 22 are specific to this condition. Other listed values are CF10MC reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CF10MC-AC has a density of 7.95 g/cm³ (0.287 lb/in³), heavier than 81% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
CF10MC-AC has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
CF10MC-AC is rated for continuous service to 650°C (1,202 °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 16 µm/m·K (8.89 µin/in·°F).
Electrical3
CF10MC-AC conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 62% of stainless steel grades.
Sustainability4
Producing a kilogram of CF10MC-AC takes about 55 MJ of energy and emits 4.6 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
CF10MC-AC's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (70/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CF10MC-AC
Is CF10MC easy to machine?
Work-hardening austenitic casting plus hard NbC particles — use rigid setups, sharp coated carbide, heavy positive feed, 60–110 m/min, flood coolant, avoid dwelling.
Can CF10MC be welded?
Very good with GTAW/SMAW using ER/E 316Cb (or 316L/347 matching) filler; Nb stabilization means no post-weld solution anneal is normally needed, but keep heat input low and interpass <150 °C to limit hot-cracking in the low-ferrite matrix.
Can CF10MC be formed, bent or molded?
Supplied as sand or investment castings; provide generous risering (long freezing range, ~2 % solidification shrinkage) and avoid abrupt section changes; cold forming is not a normal route.
What surface finishes work on CF10MC?
Grind/blast, then pickle-passivate per ASTM A967 or electropolish; no anodizing — surface finish is limited by casting skin and porosity.
CF10MC 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 |
|---|---|---|
| CNb ≥ 10×C required for stabilization | ≤ 0.1 | 0.07 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 2 | 1.2 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Cr | 15 – 18 | 16.5 |
| Ni | 13 – 16 | 14.5 |
| Mo | 1.75 – 2.25 | 2 |
| NbCb (columbium) ≥ 10 × C min per ASTM A351 | 0.7 – 1.2 | 0.9 |
| Fe | balance | — |
CF10MC-AC — frequently asked
What is CF10MC-AC used for?
CF10MC-AC is typically used for valve bodies, pump castings for high-temperature service and stabilized weldable pressure castings. In short: nb-stabilized Mo cast austenitic; as-welded, no solution anneal; 760 °C service capability.
What is the yield strength of CF10MC-AC?
CF10MC-AC has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CF10MC-AC easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Work-hardening austenitic casting plus hard NbC particles — use rigid setups, sharp coated carbide, heavy positive feed, 60–110 m/min, flood coolant, avoid dwelling.
Can CF10MC-AC be welded?
Yes — weldability is rated very good (70/100). Very good with GTAW/SMAW using ER/E 316Cb (or 316L/347 matching) filler; Nb stabilization means no post-weld solution anneal is normally needed, but keep heat input low and interpass <150 °C to limit hot-cracking in the low-ferrite matrix.
What surface finishes work on CF10MC-AC?
Grind/blast, then pickle-passivate per ASTM A967 or electropolish; no anodizing — surface finish is limited by casting skin and porosity.
Can CF10MC-AC be formed, bent or molded?
Supplied as sand or investment castings; provide generous risering (long freezing range, ~2 % solidification shrinkage) and avoid abrupt section changes; cold forming is not a normal route.
What is the maximum service temperature of CF10MC-AC?
CF10MC-AC is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CF10MC-SA and CF10MC-AC?
SA is the default condition — standard supply condition for all pressure-containing castings: maximum ductility, dissolved chromium carbides, Nb held for later stabilization. AC: only for non-code, non-corrosive structural castings — grain-boundary carbides lower ductility and intergranular corrosion resistance. Yield strength is 250 MPa in SA versus 260 MPa in AC.
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)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Cast Stainless Steels) — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (Cast Stainless Steels) — ASM International (2005)
- Steel Founders' Society of America — High Alloy Data Sheets, Corrosion Series (CF grades) — SFSA (2004)
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.