Steel 1139-ANN vs 1139-IH
Steel · 1139 temper comparison
1139-ANN and 1139-IH are two conditions of the same steel grade, 1139: ANN (annealed) versus IH (induction hardened). The chemistry is identical, so every difference below comes from the condition. 1139-IH is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 345 MPa (50 ksi) for 1139-ANN, about 65% more; tensile strength follows at 700 MPa (102 ksi) vs 570 MPa (82.7 ksi). In exchange, 1139-ANN is the more ductile: elongation 22% versus 11% for 1139-IH, and 1139-IH is harder (560 HB vs 167 HB). 1139-ANN runs hotter in service (400°C vs 200°C continuous). On the shop floor, 1139-ANN machines more easily (good vs poor) and 1139-ANN welds better (poor vs not recommended).
1139-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1139-IHChoose it when strength drives the design.
1139-ANN vs 1139-IH: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 140 GPa20.3 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,495°C2,723 °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 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.62 V · Corrosion Resistance 10 / 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: Brazeability / Solderability 55 / 100 · Polishability 40 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
1139-ANN vs 1139-IH — frequently asked
Is 1139-IH stronger than 1139-ANN?
Yes. 1139-IH has a typical yield strength of 570 MPa (82.7 ksi) against 345 MPa (50 ksi) for 1139-ANN — about 65% more. Tensile strength is 700 MPa (102 ksi) vs 570 MPa (82.7 ksi).
Which condition does FabDigit quote by default, ANN or IH?
CD is the default 1139 condition in the FabDigit quote flow (neither ANN nor IH). 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, 1139-ANN or 1139-IH?
1139-ANN. Its machinability rates good (66/100) against poor (22/100) for 1139-IH; for welding the order is 1139-ANN first (poor, 32/100) then 1139-IH (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1139-ANN and 1139-IH 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.