Steel K93050-A vs K93050-B
Steel · K93050 temper comparison
K93050-A and K93050-B are two conditions of the same steel grade, K93050: A (solution annealed) versus B (temper B). The chemistry is identical, so every difference below comes from the condition. K93050-B is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 280 MPa (40.6 ksi) for K93050-A, about 79% more; tensile strength follows at 620 MPa (89.9 ksi) vs 490 MPa (71.1 ksi). In exchange, K93050-A is the more ductile: elongation 40% versus 18% for K93050-B, and K93050-B is harder (190 HB vs 135 HB). K93050-A runs hotter in service (230°C vs 200°C continuous). On the shop floor, K93050-A welds better (very good vs good).
K93050-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
K93050-BChoose it when strength drives the design.
K93050-A vs K93050-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
Compressive Strength
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 112 GPa16.2 Msi · Poisson's Ratio 0.29
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 270 J/g116 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 2.1 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.4 V
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 45 / 100 · Brazeability / Solderability 75 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 66 MJ/kg28,375 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 120 L/kg14.4 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.
K93050-A vs K93050-B — frequently asked
Is K93050-B stronger than K93050-A?
Yes. K93050-B has a typical yield strength of 500 MPa (72.5 ksi) against 280 MPa (40.6 ksi) for K93050-A — about 79% more. Tensile strength is 620 MPa (89.9 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, A or B?
A is the default K93050 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 welds better, K93050-A or K93050-B?
K93050-A. Its weldability rates very good (75/100) against good (65/100) for K93050-B.
Ready to make it?
Upload a CAD file and FabDigit prices the part in K93050-A and K93050-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.