Stainless Steel CF8A
Grade
ASTM CF8 · UNS J92600 · EN 1.4308, GX5CrNi19-9 · JIS SCS13, SCS13A · GB ZG07Cr19Ni10, 10Kh18N9L
CF8A = solution annealed, higher-ferrite higher-strength variant
Pick when the drawing calls out higher minimum strength (530/240 MPa) at slightly reduced toughness; same chemistry envelope with balanced higher δ-ferrite.
Values for the CF8A condition
Other CF8 tempers and conditions
CF8 is listed in 4 conditions; see the grade overview at CF8.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for all pressure-retaining CF8 castings; carbides dissolved for best corrosion resistance and ductility. | 255 | 520 | 55 | 140 HB | — |
solution annealed casting for severe corrosive service | Order to ASTM A744 when corrosion performance (not just pressure integrity) governs; tighter heat-treat/quench and surface-condition requirements. | 255 | 520 | 55 | 140 HB | 2.3 % IACS |
As fabricated | Only for non-pressure, non-corrosive decorative or structural parts — carbide networks from slow cooling leave the casting sensitized and less ductile. | 265 | 500 | 30 | 160 HB | 2.3 % IACS |
CF8AThis page Solution annealed, higher-ferrite higher-strength variant | Pick when the drawing calls out higher minimum strength (530/240 MPa) at slightly reduced toughness; same chemistry envelope with balanced higher δ-ferrite. | 285 | 570 | 48 | 155 HB | 2.3 % IACS |
What is CF8A?
CF8A is CF8 in the CF8A grade — pick when the drawing calls out higher minimum strength (530/240 MPa) at slightly reduced toughness; same chemistry envelope with balanced higher δ-ferrite. CF8A has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 74% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi). CF8A 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; CF8A is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 48%, better than 85% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Hard to polish — 60/100, worse than 80% of stainless steel grades
CF8A properties
Typical room-temperature values for CF8A; 22 are specific to this condition. Other listed values are CF8 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CF8A 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).
Mechanical16
CF8A has a yield strength of 285 MPa (41.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 74% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
CF8A is rated for continuous service to 760°C (1,400 °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 17.3 µm/m·K (9.61 µin/in·°F).
Electrical3
CF8A conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 54% of stainless steel grades.
Sustainability4
Producing a kilogram of CF8A takes about 48 MJ of energy and emits 3.6 kg of CO₂ — less than 85% of stainless steel grades. Typical recycled content is 85%.
Manufacturability7
CF8A's machinability is fair (37/100, better than 57% of stainless steel grades); weldability very good (76/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CF8A
Is CF8 easy to machine?
Machine like 304: rigid setup, positive-rake carbide, heavy constant feed to cut under the work-hardened skin, and flood coolant; expect ~40% of 1212 speeds and remove the abrasive cast skin in the first pass.
Can CF8 be welded?
Readily welded by GTAW/GMAW/SMAW with 308/308L filler, no preheat and low interpass temperature; the 5–20% δ-ferrite suppresses hot cracking, but weld repairs on corrosion-service parts should be followed by re-solution annealing.
Can CF8 be formed, bent or molded?
Foundry alloy — good fluidity and moderate 2.0–2.5% solidification shrinkage; use generous risering, chills at heavy sections, then solution anneal at 1040–1100 °C and water quench.
What surface finishes work on CF8?
Passivate per ASTM A967 (nitric or citric) or electropolish after machining; shot/bead blast and pickling remove scale, and mechanical polish reaches ~Ra 0.4 µm limited by casting porosity.
CF8 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 |
|---|---|---|
| CASTM A351/A743 CF8 | ≤ 0.08 | 0.06 |
| Mn | ≤ 1.5 | 1 |
| Siaids fluidity | ≤ 2 | 1.3 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.02 |
| Cr | 18 – 21 | 19.5 |
| Ni | 8 – 11 | 9.5 |
| Moresidual, per A351 optional limit | ≤ 0.5 | 0.2 |
| Fe | balance | — |
CF8A — frequently asked
What is CF8A used for?
CF8A is typically used for valve bodies, pump casings, pipe fittings and food processing equipment. In short: cast equivalent of 304; default stainless casting grade; weldable with 308L filler.
What is the yield strength of CF8A?
CF8A has a typical yield strength of 285 MPa (41.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 74% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is CF8A easy to machine?
Not especially — machinability is rated fair (37/100, better than 57% of stainless steel grades). Machine like 304: rigid setup, positive-rake carbide, heavy constant feed to cut under the work-hardened skin, and flood coolant; expect ~40% of 1212 speeds and remove the abrasive cast skin in the first pass.
Can CF8A be welded?
Yes — weldability is rated very good (76/100). Readily welded by GTAW/GMAW/SMAW with 308/308L filler, no preheat and low interpass temperature; the 5–20% δ-ferrite suppresses hot cracking, but weld repairs on corrosion-service parts should be followed by re-solution annealing.
What surface finishes work on CF8A?
Passivate per ASTM A967 (nitric or citric) or electropolish after machining; shot/bead blast and pickling remove scale, and mechanical polish reaches ~Ra 0.4 µm limited by casting porosity.
Can CF8A be formed, bent or molded?
Foundry alloy — good fluidity and moderate 2.0–2.5% solidification shrinkage; use generous risering, chills at heavy sections, then solution anneal at 1040–1100 °C and water quench.
What is the maximum service temperature of CF8A?
CF8A is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CF8-SA and CF8A?
SA is the default condition — standard supply condition for all pressure-retaining CF8 castings; carbides dissolved for best corrosion resistance and ductility. CF8A: pick when the drawing calls out higher minimum strength (530/240 MPa) at slightly reduced toughness; same chemistry envelope with balanced higher δ-ferrite. Yield strength is 255 MPa in SA versus 285 MPa in CF8A.
Sources
- ASTM A351/A351M Castings, Austenitic, for Pressure-Containing Parts — ASTM (2022)
- ASTM A743/A743M Castings, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM (2021)
- ASTM A744/A744M Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service — ASTM (2021)
- ASTM A451/A451M Centrifugally Cast Austenitic Steel Pipe for High-Temperature Service — ASTM (2021)
- EN 10213 / EN 10283 — GX5CrNi19-10 (1.4308) — CEN (2016)
- GB/T 12230 (ZG07Cr19Ni10) — SAC (2016)
- ASM Handbook Vol.1 — Cast Stainless Steels — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America (1995)
- Nickel Institute — Cast Stainless Steels reference series — Nickel Institute (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.