Stainless Steel 1.4308-ST vs 1.4308 ST-CENT
Stainless Steel · 1.4308 temper comparison
1.4308-ST and 1.4308 ST-CENT are two conditions of the same stainless steel grade, 1.4308: ST (solution annealed) versus ST-CENT (centrifugally cast tube, solution annealed). The chemistry is identical, so every difference below comes from the condition. 1.4308 ST-CENT is the stronger of the two: yield strength 275 MPa (39.9 ksi) against 250 MPa (36.3 ksi) for 1.4308-ST, about 10% more; tensile strength follows at 550 MPa (79.8 ksi) vs 520 MPa (75.4 ksi). In exchange, 1.4308-ST is the more ductile: elongation 50% versus 45% for 1.4308 ST-CENT, and 1.4308 ST-CENT is harder (150 HB vs 140 HB).
1.4308-STChoose it when the part is bent, formed or impact-loaded.
1.4308 ST-CENTChoose it when strength drives the design.
1.4308-ST vs 1.4308 ST-CENT: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 195 GPa28.3 Msi · Shear Modulus 75 GPa10.9 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.29
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.
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 µm/m·K9.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 760°C1,400 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.4 % IACS · Electrical Resistivity 7.2×10⁻⁷ Ω·m28.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.05 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 88 / 100 · Castability 78 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 130 L/kg15.6 gal/lb · Typical Recycled Content 70%
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.
1.4308-ST vs 1.4308 ST-CENT — frequently asked
Is 1.4308 ST-CENT stronger than 1.4308-ST?
Yes. 1.4308 ST-CENT has a typical yield strength of 275 MPa (39.9 ksi) against 250 MPa (36.3 ksi) for 1.4308-ST — about 10% more. Tensile strength is 550 MPa (79.8 ksi) vs 520 MPa (75.4 ksi).
Which condition does FabDigit quote by default, ST or ST-CENT?
ST is the default 1.4308 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 1.4308-ST over 1.4308 ST-CENT?
Pick 1.4308-ST when the part is bent, formed or impact-loaded. Pick 1.4308 ST-CENT when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4308-ST and 1.4308 ST-CENT 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.