Steel K93603-A vs K93603-B
Steel · K93603 temper comparison
K93603-A and K93603-B are two conditions of the same steel grade, K93603: A (solution annealed) versus B (temper B). The chemistry is identical, so every difference below comes from the condition. K93603-B is the stronger of the two: yield strength 480 MPa (69.6 ksi) against 270 MPa (39.2 ksi) for K93603-A, about 78% more; tensile strength follows at 620 MPa (89.9 ksi) vs 480 MPa (69.6 ksi). In exchange, K93603-A is the more ductile: elongation 32% versus 15% for K93603-B, and K93603-B is harder (200 HB vs 145 HB). K93603-A runs hotter in service (200°C vs 180°C continuous).
K93603-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
K93603-BChoose it when strength drives the design.
K93603-A vs K93603-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 55 GPa8 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.29 · Compressive Strength 275 MPa39.9 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 -253°C-423 °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) -0.35 V · Corrosion Resistance 28 / 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 35 / 100 · Brazeability / Solderability 60 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 6 kg CO₂/kg · Embodied Water 210 L/kg25.2 gal/lb · Typical Recycled Content 25%
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.
K93603-A vs K93603-B — frequently asked
Is K93603-B stronger than K93603-A?
Yes. K93603-B has a typical yield strength of 480 MPa (69.6 ksi) against 270 MPa (39.2 ksi) for K93603-A — about 78% more. Tensile strength is 620 MPa (89.9 ksi) vs 480 MPa (69.6 ksi).
Which condition does FabDigit quote by default, A or B?
A is the default K93603 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, K93603-A or K93603-B?
K93603-B, by a small margin. Both rate fair for machinability — 50/100 against 45/100 for K93603-A; for welding the order is K93603-A first (poor, 25/100) then K93603-B (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in K93603-A and K93603-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.