Steel K93500-A vs K93500-B
Steel · K93500 temper comparison
K93500-A and K93500-B are two conditions of the same steel grade, K93500: A (solution annealed) versus B (temper B). The chemistry is identical, so every difference below comes from the condition. K93500-B is the stronger of the two: yield strength 520 MPa (75.4 ksi) against 280 MPa (40.6 ksi) for K93500-A, about 86% more; tensile strength follows at 640 MPa (92.8 ksi) vs 490 MPa (71.1 ksi). In exchange, K93500-A is the more ductile: elongation 40% versus 15% for K93500-B, and K93500-B is harder (200 HB vs 140 HB). K93500-A runs hotter in service (200°C vs 150°C continuous). On the shop floor, K93500-A welds better (very good vs good).
K93500-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
K93500-BChoose it when strength drives the design.
K93500-A vs K93500-B: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all 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 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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 57 GPa8.3 Msi · Bulk Modulus 100 GPa14.5 Msi · Poisson's Ratio 0.29 · Compressive Strength 280 MPa40.6 ksi
Physical
Density and transition temperatures.
Same in both: Density 8.05 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,427°C2,601 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 10.5 W/m·K6.1 BTU/hr·ft·°F · Specific Heat Capacity 515 J/kg·K0.12 BTU/lb·°F · Latent Heat of Fusion 275 J/g118 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.1 % IACS · Electrical Resistivity 8.2×10⁻⁷ Ω·m32.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.45 V · Corrosion Resistance 22 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 40 / 100 · Brazeability / Solderability 80 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 100 MJ/kg42,992 BTU/lb · Embodied Carbon (primary production) 7.5 kg CO₂/kg · Embodied Water 210 L/kg25.2 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
K93500-A vs K93500-B — frequently asked
Is K93500-B stronger than K93500-A?
Yes. K93500-B has a typical yield strength of 520 MPa (75.4 ksi) against 280 MPa (40.6 ksi) for K93500-A — about 86% more. Tensile strength is 640 MPa (92.8 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, A or B?
A is the default K93500 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.
Which is easier to machine, K93500-A or K93500-B?
K93500-B. Its machinability rates fair (38/100) against poor (30/100) for K93500-A; for welding the order is K93500-A first (very good, 70/100) then K93500-B (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in K93500-A and K93500-B 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.