Stainless Steel 15-7 Mo-CH900 vs 15-7 Mo Condition A
Stainless Steel · 15-7 Mo temper comparison
15-7 Mo-CH900 and 15-7 Mo Condition A are two conditions of the same stainless steel grade, 15-7 Mo: CH900 (condition C strip aged 482 °C) versus Condition A (solution annealed). The chemistry is identical, so every difference below comes from the condition. 15-7 Mo-CH900 is the stronger of the two: yield strength 1,655 MPa (240 ksi) against 415 MPa (60.2 ksi) for 15-7 Mo Condition A, about 4.0 times as much; tensile strength follows at 1,725 MPa (250 ksi) vs 950 MPa (138 ksi). In exchange, 15-7 Mo Condition A is the more ductile: elongation 25% versus 2% for 15-7 Mo-CH900, and 15-7 Mo-CH900 is harder (48 HRC vs 13 HRC). 15-7 Mo Condition A runs hotter in service (425°C vs 370°C continuous). On the shop floor, 15-7 Mo Condition A machines more easily (fair vs poor) and 15-7 Mo Condition A welds better (fair vs poor).
15-7 Mo-CH900Choose it when strength drives the design.
15-7 Mo Condition AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
15-7 Mo-CH900 vs 15-7 Mo Condition A: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless 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 stainless 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.
15-7 Mo-CH90015-7 Mo Condition A
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Reduction in Area 45% · Compressive Strength 420 MPa60.9 ksi · Charpy V-Notch Impact (RT) 90 J66.4 ft·lbf · Hardness, Brinell 200 HB · Hardness, Rockwell B 92 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.8 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
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.1 % IACS · Electrical Resistivity 8.3×10⁻⁷ Ω·m32.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 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: Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 200 L/kg24 gal/lb
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
15-7 Mo-CH900 vs 15-7 Mo Condition A — frequently asked
Is 15-7 Mo-CH900 stronger than 15-7 Mo Condition A?
Yes. 15-7 Mo-CH900 has a typical yield strength of 1,655 MPa (240 ksi) against 415 MPa (60.2 ksi) for 15-7 Mo Condition A — about 4.0 times as much. Tensile strength is 1,725 MPa (250 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, CH900 or Condition A?
Condition A is the default 15-7 Mo 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, 15-7 Mo-CH900 or 15-7 Mo Condition A?
15-7 Mo Condition A. Its machinability rates fair (45/100) against poor (18/100) for 15-7 Mo-CH900; for welding the order is 15-7 Mo Condition A first (fair, 50/100) then 15-7 Mo-CH900 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 15-7 Mo-CH900 and 15-7 Mo Condition A 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.