Steel 13-8Mo-A vs 13-8Mo-H1150M
Steel · 13-8Mo temper comparison
13-8Mo-A and 13-8Mo-H1150M are two conditions of the same steel grade, 13-8Mo: A (solution annealed) versus H1150M (double overaged 760 °C + 621 °C). The chemistry is identical, so every difference below comes from the condition. 13-8Mo-A is the stronger of the two: yield strength 827 MPa (120 ksi) against 655 MPa (95 ksi) for 13-8Mo-H1150M, about 26% more; tensile strength follows at 1,000 MPa (145 ksi) vs 896 MPa (130 ksi). In exchange, 13-8Mo-H1150M is the more ductile: elongation 21% versus 12% for 13-8Mo-A, and 13-8Mo-A is harder (311 HB vs 286 HB). 13-8Mo-H1150M runs hotter in service (540°C vs 425°C continuous) and 13-8Mo-H1150M conducts heat better (16 W/m·K vs 14 W/m·K).
13-8Mo-AChoose it when strength drives the design.
13-8Mo-H1150MChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
13-8Mo-A vs 13-8Mo-H1150M: 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.
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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 203 GPa29.4 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.76 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,440°C2,624 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.6 µm/m·K5.9 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -73°C-99 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 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 40 / 100 · Brazeability / Solderability 45 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 5.4 kg CO₂/kg · Embodied Water 160 L/kg19.2 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.
13-8Mo-A vs 13-8Mo-H1150M — frequently asked
Is 13-8Mo-A stronger than 13-8Mo-H1150M?
Yes. 13-8Mo-A has a typical yield strength of 827 MPa (120 ksi) against 655 MPa (95 ksi) for 13-8Mo-H1150M — about 26% more. Tensile strength is 1,000 MPa (145 ksi) vs 896 MPa (130 ksi).
Which condition does FabDigit quote by default, A or H1150M?
H1000 is the default 13-8Mo condition in the FabDigit quote flow (neither A nor H1150M). 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, 13-8Mo-A or 13-8Mo-H1150M?
13-8Mo-H1150M. Its weldability rates very good (70/100) against good (65/100) for 13-8Mo-A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 13-8Mo-A and 13-8Mo-H1150M 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.