Stainless Steel CK35MN-SC
Finish state
ASTM CK35MN
SC = statically sand/investment cast shape
Standard route for valve bodies, grates, fixtures and complex furnace hardware where section thickness varies.
Values for the SC condition
Other CK35MN tempers and conditions
CK35MN is listed in 4 conditions; see the grade overview at CK35MN.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Choose when maximum ductility, toughness and aqueous corrosion resistance are needed before service; dissolves the as-cast carbide network. | 230 | 480 | 38 | 170 HB | 2 % IACS |
SCThis page Statically sand/investment cast shape | Standard route for valve bodies, grates, fixtures and complex furnace hardware where section thickness varies. | 245 | 495 | 30 | 183 HB | 2 % IACS |
ACDefault Spheroidize annealed | Standard supply condition for heat-resistant service — carbides in the as-cast network actually aid creep strength. | 250 | 500 | 30 | 185 HB | 2 % IACS |
Stress relieved | Use on large or welded castings to relieve residual stress and reduce distortion before machining; does not restore ductility. | 250 | 495 | 26 | 187 HB | 2.1 % IACS |
What is CK35MN-SC?
CK35MN-SC is CK35MN supplied in the SC condition — standard route for valve bodies, grates, fixtures and complex furnace hardware where section thickness varies. CK35MN-SC has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 495 MPa (71.8 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi). CK35MN-SC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F). AC is the default condition FabDigit quotes; SC is available on request or by drawing note.
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
Limitations
- Low strength — 245 MPa (35.5 ksi), worse than 94% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
- Limited formability — 20/100, worse than 86% of stainless steel grades
- Difficult to weld — 38/100, worse than 84% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
CK35MN-SC properties
Typical room-temperature values for CK35MN-SC; 23 are specific to this condition. Other listed values are CK35MN reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CK35MN-SC has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical15
CK35MN-SC has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 495 MPa (71.8 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
CK35MN-SC is rated for continuous service to 1,050°C (1,922 °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 15.9 µm/m·K (8.83 µin/in·°F).
Electrical3
CK35MN-SC conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (53/100), worse than 75% of stainless steel grades.
Sustainability4
Producing a kilogram of CK35MN-SC takes about 60 MJ of energy and emits 4.5 kg of CO₂ — more than 70% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
CK35MN-SC's machinability is poor (27/100, worse than 83% of stainless steel grades); weldability fair (38/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CK35MN-SC
Is CK35MN easy to machine?
Rigid setups, low speed with heavy positive feed, sharp carbide or ceramic tooling and flood coolant; the work-hardening austenite plus interdendritic carbides cause rapid edge wear, so avoid dwelling and interrupted light cuts.
Can CK35MN be welded?
Weldable with matching 25Cr-20Ni (ER310/E310-type) filler using low heat input, small stringer beads and interpass temperature control; fully austenitic ferrite-free weld metal is hot-crack sensitive and the high-carbon base is prone to HAZ carbide precipitation.
Can CK35MN be formed, bent or molded?
A casting grade only — not intended for cold forming; design generous fillets, uniform sections and adequate risers, allow ~2 % solidification shrinkage and avoid hot-tear-prone sharp corners.
What surface finishes work on CK35MN?
Grit blast plus pickle/passivate to remove casting scale; shot-peening or grinding improves fatigue, and aluminizing or diffusion coating extends life above 1000 °C in sulphur-bearing gas.
CK35MN 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 carbon for creep strength; verify range against the current ASTM A351/A743 edition | 0.25 – 0.35 | 0.3 |
| Mnmanganese-alloyed feature of this grade (partial Ni substitute / austenite stabilizer) | 1.5 – 4 | 2.5 |
| Si | ≤ 1.5 | 1 |
| CrCK-family chromium level, as CK20 | 23 – 27 | 25 |
| Ni | 18 – 22 | 20 |
| Moresidual only | ≤ 0.5 | 0.2 |
| Nnitrogen may be specified to strengthen the austenite | ≤ 0.2 | 0.1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
CK35MN-SC — frequently asked
What is CK35MN-SC used for?
CK35MN-SC is typically used for high-temperature furnace castings, heat-resistant process equipment, heat treatment fixtures and trays, furnace rollers and rails, radiant tube and burner parts and kiln fittings. In short: manganese-alloyed CK20 substitute; lower nickel content; 1050 °C oxidation service.
What is the yield strength of CK35MN-SC?
CK35MN-SC has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 495 MPa (71.8 ksi) — weaker than 94% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CK35MN-SC easy to machine?
Not especially — machinability is rated poor (27/100, worse than 83% of stainless steel grades). Rigid setups, low speed with heavy positive feed, sharp carbide or ceramic tooling and flood coolant; the work-hardening austenite plus interdendritic carbides cause rapid edge wear, so avoid dwelling and interrupted light cuts.
Can CK35MN-SC be welded?
With care — weldability is rated fair (38/100). Weldable with matching 25Cr-20Ni (ER310/E310-type) filler using low heat input, small stringer beads and interpass temperature control; fully austenitic ferrite-free weld metal is hot-crack sensitive and the high-carbon base is prone to HAZ carbide precipitation.
What surface finishes work on CK35MN-SC?
Grit blast plus pickle/passivate to remove casting scale; shot-peening or grinding improves fatigue, and aluminizing or diffusion coating extends life above 1000 °C in sulphur-bearing gas.
Can CK35MN-SC be formed, bent or molded?
A casting grade only — not intended for cold forming; design generous fillets, uniform sections and adequate risers, allow ~2 % solidification shrinkage and avoid hot-tear-prone sharp corners.
What is the maximum service temperature of CK35MN-SC?
CK35MN-SC 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 CK35MN-AC and CK35MN-SA?
AC is the default condition — standard supply condition for heat-resistant service — carbides in the as-cast network actually aid creep strength. SA: choose when maximum ductility, toughness and aqueous corrosion resistance are needed before service; dissolves the as-cast carbide network. Yield strength is 250 MPa in AC versus 230 MPa in SA.
Sources
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts — ASTM International (2018)
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2019)
- High Alloy Data Sheets, Heat Series (CK-type / HK-type alloys) — Steel Founders' Society of America (2004)
- 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.