Stainless Steel CF16Fa SA+HIP
Heat-treated state
ASTM CF16Fa
SA+HIP = hot isostatically pressed then solution annealed
Choose when internal shrinkage porosity must be closed for pressure-tight or fatigue-loaded valve/pump bodies.
Values for the SA+HIP condition
Other CF16Fa tempers and conditions
CF16Fa is listed in 3 conditions; see the grade overview at CF16Fa.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed | Standard supply condition for corrosion-resistant castings — carbides dissolved and quenched for maximum ductility and corrosion resistance. | 240 | 500 | 42 | 150 HB | — |
SA+HIPThis page Hot isostatically pressed then solution annealed | Choose when internal shrinkage porosity must be closed for pressure-tight or fatigue-loaded valve/pump bodies. | 245 | 520 | 48 | 150 HB | 2.3 % IACS |
Spheroidize annealed | Lowest-cost condition for non-critical, low-corrosion-duty parts where sensitized grain boundaries and lower ductility are acceptable. | 260 | 510 | 25 | 165 HB | 2.4 % IACS |
What is CF16Fa SA+HIP?
CF16Fa SA+HIP is CF16Fa heat treated to SA+HIP — choose when internal shrinkage porosity must be closed for pressure-tight or fatigue-loaded valve/pump bodies. CF16Fa SA+HIP has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi). CF16Fa SA+HIP 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; SA+HIP is available on request or by drawing note.
Advantages
- Easy to machine — 72/100, better than 99% of stainless steel grades
- Ductile — tolerates forming and impact — 48%, better than 85% of stainless steel grades
Limitations
- Hard to polish — 40/100, worse than 99% of stainless steel grades
- Low strength — 245 MPa (35.5 ksi), worse than 94% of stainless steel grades
- Difficult to weld — 25/100, worse than 92% of stainless steel grades
- Limited formability — 18/100, worse than 89% of stainless steel grades
CF16Fa SA+HIP properties
Typical room-temperature values for CF16Fa SA+HIP; 22 are specific to this condition. Other listed values are CF16Fa reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
CF16Fa SA+HIP 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
CF16Fa SA+HIP has a yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
CF16Fa SA+HIP is rated for continuous service to 650°C (1,202 °F). It conducts heat at 16.5 W/m·K (9.53 BTU/hr·ft·°F), better than 70% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
CF16Fa SA+HIP conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of CF16Fa SA+HIP takes about 52 MJ of energy and emits 5.2 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
CF16Fa SA+HIP's machinability is very good (72/100, better than 99% of stainless steel grades); weldability poor (25/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CF16Fa SA+HIP
Is CF16Fa easy to machine?
Excellent for a stainless casting — run sharp carbide at 25–45 % higher speed than CF8M with positive rake and good chip-breaking; sulfides give short chips and clean threads.
Can CF16Fa be welded?
Not recommended for structural welds; sulfur/selenium promotes hot cracking — if repair is unavoidable use low-heat-input GTAW with 309/312 filler and re-solution-anneal.
Can CF16Fa be formed, bent or molded?
Sand or investment cast with generous risering; austenitic solidification shrinkage ~2.1 % and low thermal conductivity require directional feeding of heavy sections.
What surface finishes work on CF16Fa?
Passivate (nitric or citric, ASTM A967) after machining; mirror polishing and electropolishing are limited by inclusion pull-out, so specify a satin/bead-blast finish where cosmetics matter.
CF16Fa 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 | ≤ 0.16 | 0.12 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 2 | 1.3 |
| P | ≤ 0.04 | 0.03 |
| Sfree-machining addition; some heats substitute Se 0.20–0.35 (CF16F) | 0.2 – 0.4 | 0.28 |
| Cr | 18 – 21 | 19.5 |
| Ni | 9 – 12 | 10.5 |
| Mooptional/residual Mo permitted, aids machinability and corrosion | ≤ 1.5 | 0.5 |
| Fe | balance | — |
CF16Fa SA+HIP — frequently asked
What is CF16Fa SA+HIP used for?
CF16Fa SA+HIP is typically used for machined fittings, precision valve components, valve trim and stems, instrument housings with tapped ports, threaded adapters and couplings and small pump and meter bodies. In short: free-machining moly cast stainless; better machinability than CF8M; machined fittings grade.
What is the yield strength of CF16Fa SA+HIP?
CF16Fa SA+HIP has a typical yield strength of 245 MPa (35.5 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 94% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is CF16Fa SA+HIP easy to machine?
Yes — machinability is rated very good (72/100, better than 99% of stainless steel grades). Excellent for a stainless casting — run sharp carbide at 25–45 % higher speed than CF8M with positive rake and good chip-breaking; sulfides give short chips and clean threads.
Can CF16Fa SA+HIP be welded?
Not readily — weldability is rated poor (25/100). Not recommended for structural welds; sulfur/selenium promotes hot cracking — if repair is unavoidable use low-heat-input GTAW with 309/312 filler and re-solution-anneal.
What surface finishes work on CF16Fa SA+HIP?
Passivate (nitric or citric, ASTM A967) after machining; mirror polishing and electropolishing are limited by inclusion pull-out, so specify a satin/bead-blast finish where cosmetics matter.
Can CF16Fa SA+HIP be formed, bent or molded?
Sand or investment cast with generous risering; austenitic solidification shrinkage ~2.1 % and low thermal conductivity require directional feeding of heavy sections.
What is the maximum service temperature of CF16Fa SA+HIP?
CF16Fa SA+HIP 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 CF16Fa-SA and CF16Fa-AC?
SA is the default condition — standard supply condition for corrosion-resistant castings — carbides dissolved and quenched for maximum ductility and corrosion resistance. AC: lowest-cost condition for non-critical, low-corrosion-duty parts where sensitized grain boundaries and lower ductility are acceptable. Yield strength is 240 MPa in SA versus 260 MPa in AC.
Sources
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application — ASTM International (2019)
- ASTM A744/A744M — Castings, Corrosion Resistant, for Severe Service — ASTM International (2019)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASTM A967/A967M — Chemical Passivation Treatments for Stainless Steel Parts — ASTM International (2017)
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.