Stainless Steel CH10-AC (Spheroidize annealed)
Heat-treated state
UNS J93401
Used only for non-critical high-temperature parts where corrosion service and code acceptance are not required.
Values for the AC condition
Other CH10 tempers and conditions
CH10 is listed in 3 conditions; see the grade overview at CH10.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for ASTM A351/A743 castings; maximum ductility and corrosion resistance. | 250 | 530 | 38 | 165 HB | — |
ACThis page Spheroidize annealed | Used only for non-critical high-temperature parts where corrosion service and code acceptance are not required. | 260 | 500 | 22 | 180 HB | 2.2 % IACS |
Centrifugally cast, solution annealed | Pick for tubes, rings and cylinders needing denser, more uniform structure and slightly higher strength than static castings. | 270 | 560 | 40 | 170 HB | 2.2 % IACS |
What is CH10-AC?
CH10-AC is CH10 heat treated to AC — used only for non-critical high-temperature parts where corrosion service and code acceptance are not required. CH10-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). CH10-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.
Advantages
- High service temperature — 1,000°C (1,832 °F), better than 88% of stainless steel grades
Limitations
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
CH10-AC properties
Typical room-temperature values for CH10-AC; 22 are specific to this condition. Other listed values are CH10 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CH10-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).
Mechanical14
CH10-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
CH10-AC is rated for continuous service to 1,000°C (1,832 °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
CH10-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 CH10-AC takes about 60 MJ of energy and emits 4.6 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CH10-AC's machinability is poor (31/100, worse than 65% of stainless steel grades); weldability good (60/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CH10-AC
Is CH10 easy to machine?
Gummy and work-hardening — use rigid setups, sharp positive-rake carbide, heavy feed, low-to-moderate speed and flood coolant; avoid dwelling.
Can CH10 be welded?
Readily welded with GTAW/SMAW using ER309L/E309L filler; low carbon minimizes HAZ carbide precipitation, keep interpass below ~150 °C and control ferrite to limit σ-phase.
Can CH10 be formed, bent or molded?
Supplied as sand or centrifugal castings — design generous fillets and risers for the wide freezing range; cold forming is not a normal route.
What surface finishes work on CH10?
Passivate per ASTM A967 or pickle/electropolish after grinding; do not anodize. Shot blasting plus pickling gives a uniform oxide-free surface.
CH10 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 |
|---|---|---|
| Clow-carbon version of CH20 | ≤ 0.1 | 0.07 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 2 | 1.2 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Cr | 22 – 26 | 24 |
| Ni | 12 – 15 | 13 |
| Moresidual, not intentionally added | ≤ 0.5 | — |
| Fe | balance | — |
CH10-AC — frequently asked
What is CH10-AC used for?
CH10-AC is typically used for high-temperature furnace components, heat-resistant valve castings, furnace rolls and centrifugally cast tubes, radiant tube and burner parts, heat-treatment fixtures, trays and grids and kiln and calciner internals. In short: 1000 °C cast austenitic; weldable low-carbon CH20; furnace and heat-treat castings.
What is the yield strength of CH10-AC?
CH10-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 CH10-AC easy to machine?
Not especially — machinability is rated poor (31/100, worse than 65% of stainless steel grades). Gummy and work-hardening — use rigid setups, sharp positive-rake carbide, heavy feed, low-to-moderate speed and flood coolant; avoid dwelling.
Can CH10-AC be welded?
Yes — weldability is rated good (60/100). Readily welded with GTAW/SMAW using ER309L/E309L filler; low carbon minimizes HAZ carbide precipitation, keep interpass below ~150 °C and control ferrite to limit σ-phase.
What surface finishes work on CH10-AC?
Passivate per ASTM A967 or pickle/electropolish after grinding; do not anodize. Shot blasting plus pickling gives a uniform oxide-free surface.
Can CH10-AC be formed, bent or molded?
Supplied as sand or centrifugal castings — design generous fillets and risers for the wide freezing range; cold forming is not a normal route.
What is the maximum service temperature of CH10-AC?
CH10-AC is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CH10-SA and CH10 CENT-SA?
SA is the default condition — standard supply condition for ASTM A351/A743 castings; maximum ductility and corrosion resistance. CENT-SA: pick for tubes, rings and cylinders needing denser, more uniform structure and slightly higher strength than static castings. Yield strength is 250 MPa in SA versus 270 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)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — 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.