Stainless Steel ZG1Cr18Ni9-F vs ZG1Cr18Ni9-ST
Stainless Steel · ZG1Cr18Ni9 temper comparison
ZG1Cr18Ni9-F and ZG1Cr18Ni9-ST are two conditions of the same stainless steel grade, ZG1Cr18Ni9: F (as fabricated) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. ZG1Cr18Ni9-ST is the stronger of the two: tensile strength 520 MPa (75.4 ksi) against 480 MPa (69.6 ksi) for ZG1Cr18Ni9-F, about 8% more. ZG1Cr18Ni9-ST is the more ductile: elongation 55% versus 30% for ZG1Cr18Ni9-F, and ZG1Cr18Ni9-F is harder (160 HB vs 140 HB). ZG1Cr18Ni9-ST runs hotter in service (760°C vs 550°C continuous).
ZG1Cr18Ni9-STChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
ZG1Cr18Ni9-F vs ZG1Cr18Ni9-ST: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all stainless steel grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 193 GPa28 Msi · Shear Modulus 75 GPa10.9 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 250 MPa36.3 ksi · Shear Strength 380 MPa55.1 ksi · Fatigue Strength (Endurance Limit) 230 MPa33.4 ksi · Fracture Toughness (K_IC) 180 MPa·√m164 ksi·√in · Hardness, Vickers 150 HV
Physical
Density and transition temperatures.
Same in both: Density 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 16.2 W/m·K9.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.3 µm/m·K9.6 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.4 % IACS · Electrical Resistivity 7.1×10⁻⁷ Ω·m28 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.08 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 85 / 100 · Formability (cold) 25 / 100 · Castability 75 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 4.5 kg CO₂/kg · Embodied Water 110 L/kg13.2 gal/lb · Typical Recycled Content 75%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
ZG1Cr18Ni9-F vs ZG1Cr18Ni9-ST — frequently asked
Is ZG1Cr18Ni9-ST stronger than ZG1Cr18Ni9-F?
Yes. ZG1Cr18Ni9-ST has a typical tensile strength of 520 MPa (75.4 ksi) against 480 MPa (69.6 ksi) for ZG1Cr18Ni9-F — about 8% more.
Which condition does FabDigit quote by default, F or ST?
ST is the default ZG1Cr18Ni9 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose ZG1Cr18Ni9-F over ZG1Cr18Ni9-ST?
Pick ZG1Cr18Ni9-ST when strength drives the design, or when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ZG1Cr18Ni9-F and ZG1Cr18Ni9-ST side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.