Stainless Steel CF8M
ASTM CF8M · UNS J92900 · EN 1.4408, GX5CrNiMo19-11-2 · JIS SCS14, SCS14A · GB ZG07Cr17Ni12Mo2, 12Kh18N12M3TL
CF8M is the molybdenum-bearing cast austenitic stainless steel of ASTM A351/A743/A744 (J92900, EN 1.4408), the casting counterpart of wrought 316 with a controlled δ-ferrite content.
Reference datasheet — CF8M is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
CF8M tempers and conditions
CF8M is supplied in 7 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Dual certified CF3M/CF8M | Common stock condition for welded assemblies: low carbon avoids sensitisation while still certifying to CF8M strength minima. | 250 | 505 | 55 | 150 HB | 2.2 % IACS |
As fabricated | Only for non-pressure, non-corrosive decorative or structural parts; carbides at grain boundaries lower corrosion resistance and toughness. | 255 | 490 | 25 | 175 HB | 2.2 % IACS |
Solution annealed, ferrite-controlled and impact tested for… | Specify for cryogenic valves/pumps (LNG, liquid oxygen) where Charpy testing at -196 °C is required; ferrite typically limited to ≤10 FN. | 255 | 515 | 52 | 150 HB | 2.2 % IACS |
SADefault Solution annealed (≥1040 °C, water quenched) per ASTM A351/A743/A744 | Standard supply condition for all pressure-retaining CF8M castings; maximum corrosion resistance and ductility. | 260 | 520 | 50 | 156 HB | — |
solution annealed and hot isostatically pressed | Choose for pressure-critical, fatigue-loaded or high-polish (pharma/valve seat) castings where internal microporosity must be closed. | 270 | 540 | 55 | 156 HB | 2.2 % IACS |
Investment cast, solution annealed | Small, thin-wall precision parts (valve trim, pump impellers, fittings) — finer grain gives slightly higher strength and better as-cast surface. | 270 | 540 | 45 | 160 HB | 2.2 % IACS |
Centrifugally cast pipe, solution annealed | Pick for large-diameter cast pipe/cylindrical bodies; directional solidification gives sounder, slightly stronger metal than static sand casting. | 275 | 550 | 45 | 160 HB | 2.2 % IACS |
What is CF8M?
CF8M is the molybdenum-bearing cast austenitic stainless steel of ASTM A351/A743/A744 (J92900, EN 1.4408), the casting counterpart of wrought 316 with a controlled δ-ferrite content. It is the most widely used cast Cr-Ni-Mo grade for chemical, marine and pharmaceutical valve bodies, pump housings and fittings, normally sand or investment cast and supplied solution annealed or HIP'd. Typical solution-annealed values are 260 MPa yield, 520 MPa tensile, 50 % elongation and 156 HB, with service to 650 °C. Its standard carbon content can sensitise after welding, so low-carbon CF3M (1.4409) is the alternative for welded corrosion-critical castings. CF8M has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,390°C (2,534 °F). CF8M 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 50% and the elastic modulus is 193 GPa (28 Msi).
What is CF8M used for?
- chemical process valves
- marine pump housings
- pharmaceutical equipment
- fittings
Advantages
- Ductile — tolerates forming and impact — 50%, better than 90% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
Limitations
- Limited formability — 20/100, worse than 86% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
CF8M properties
Typical room-temperature values for CF8M-SA; bars are the position among stainless steel grades.
Physical3
CF8M has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,390°C (2,534 °F).
Mechanical15
CF8M 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 50% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
CF8M is rated for continuous service to 650°C (1,202 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
CF8M conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of CF8M takes about 55 MJ of energy and emits 4.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 80%.
Manufacturability8
CF8M's machinability is fair (40/100, better than 72% of stainless steel grades); weldability very good (75/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. CF8M is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CF8M
Is CF8M easy to machine?
Machine like cast 316 — rigid setup, sharp positive-rake carbide, heavy constant feed to cut under the work-hardened layer, 60–120 m/min with flood coolant; remove abrasive casting skin in the first pass.
Can CF8M be welded?
Readily welded by GTAW/SMAW with ER316L/E316L-16 filler; δ-ferrite resists hot cracking, no preheat, interpass <150 °C, and re-solution treat if the high-carbon CF8M version is exposed to sensitising heat.
Can CF8M be formed, bent or molded?
Sand, investment and centrifugal casting all work well; allow ~2.0–2.5 % shrinkage, use generous risers/chills for the wide freezing range and control Cr/Ni balance to keep 5–20 FN ferrite.
CF8M 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 |
|---|---|---|
| C≤0.03 % for dual-certified CF3M/CF8M | ≤ 0.08 | 0.06 |
| Mn | ≤ 1.5 | 1 |
| SiA743/A744 permit up to 2.00 % | ≤ 1.5 | 1 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.02 |
| Cr | 18 – 21 | 19 |
| Ni | 9 – 12 | 10.5 |
| Mo | 2 – 3 | 2.5 |
| Febalance; δ-ferrite typically 5–20 FN | balance |
What surface finishes work on CF8M?
Sandblast/pickle then passivate per ASTM A967 (or electropolish HIP'd castings for pharma); no anodising — plating is rarely used and requires a Wood's nickel strike.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel CF8M in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J92900
- ASTM
- A351 CF8M
- EN / DIN / Werkstoff-Nr.
- 1.4408GX5CrNiMo19-11-2
- GB (China)
- ZG07Cr17Ni12Mo212Kh18N12M3TL
- JIS
- SCS14SCS14A
- Also called
- Cast 316ZG1Cr18Ni12Mo2TiZG0Cr18Ni12Mo2
How much does CF8M cost?
CF8M is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
CF8M — frequently asked
What is CF8M used for?
CF8M is typically used for chemical process valves, marine pump housings, pharmaceutical equipment and fittings. In short: cast counterpart of 316; most common Cr-Ni-Mo casting; wide foundry availability.
What is the yield strength of CF8M?
CF8M 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 7 listed tempers.
Is CF8M easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machine like cast 316 — rigid setup, sharp positive-rake carbide, heavy constant feed to cut under the work-hardened layer, 60–120 m/min with flood coolant; remove abrasive casting skin in the first pass.
Can CF8M be welded?
Yes — weldability is rated very good (75/100). Readily welded by GTAW/SMAW with ER316L/E316L-16 filler; δ-ferrite resists hot cracking, no preheat, interpass <150 °C, and re-solution treat if the high-carbon CF8M version is exposed to sensitising heat.
What surface finishes work on CF8M?
Sandblast/pickle then passivate per ASTM A967 (or electropolish HIP'd castings for pharma); no anodising — plating is rarely used and requires a Wood's nickel strike.
Can CF8M be formed, bent or molded?
Sand, investment and centrifugal casting all work well; allow ~2.0–2.5 % shrinkage, use generous risers/chills for the wide freezing range and control Cr/Ni balance to keep 5–20 FN ferrite.
What is the maximum service temperature of CF8M?
CF8M 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 CF8M-SA and CF8M CPF8M?
SA is the default condition — standard supply condition for all pressure-retaining CF8M castings; maximum corrosion resistance and ductility. CPF8M: pick for large-diameter cast pipe/cylindrical bodies; directional solidification gives sounder, slightly stronger metal than static sand casting. Yield strength is 260 MPa in SA versus 275 MPa in CPF8M.
How much does CF8M cost?
CF8M is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts — ASTM International (2018)
- ASTM A743/A743M and A744/A744M — Corrosion-Resistant Iron-Chromium-Nickel Castings — ASTM International (2021)
- ASTM A451/A451M — Centrifugally Cast Austenitic Steel Pipe (CPF8M) — ASTM International (2021)
- EN 10283 — Corrosion resistant steel castings (1.4408 GX5CrNiMo19-11-2) — CEN (2010)
- JIS G 5121 — Stainless steel castings (SCS14, SCS14A) — JSA (2003)
- 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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.