Stainless Steel ATS-34 QT 55-57HRC vs ATS-34 QT 60-62HRC CRYO
Stainless Steel · ATS-34 temper comparison
ATS-34 QT 55-57HRC and ATS-34 QT 60-62HRC CRYO are two conditions of the same stainless steel grade, ATS-34: QT 55-57HRC versus QT 60-62HRC CRYO (Q&T + cryogenic 60–62 HRC). The chemistry is identical, so every difference below comes from the condition. ATS-34 QT 60-62HRC CRYO is the stronger of the two: yield strength 1,950 MPa (283 ksi) against 1,650 MPa (239 ksi) for ATS-34 QT 55-57HRC, about 18% more; tensile strength follows at 2,100 MPa (305 ksi) vs 1,850 MPa (268 ksi). In exchange, ATS-34 QT 55-57HRC is the more ductile: elongation 3% versus 1.5% for ATS-34 QT 60-62HRC CRYO, and ATS-34 QT 60-62HRC CRYO is harder (740 HV vs 620 HV). ATS-34 QT 55-57HRC runs hotter in service (250°C vs 160°C continuous).
ATS-34 QT 55-57HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ATS-34 QT 60-62HRC CRYOChoose it when strength drives the design.
ATS-34 QT 55-57HRC vs ATS-34 QT 60-62HRC CRYO: 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.
ATS-34 QT 55-57HRCATS-34 QT 60-62HRC CRYO
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Reduction in Area 30% · Hardness, Brinell 220 HB · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.78 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,370°C2,498 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24 W/m·K13.9 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.2 µm/m·K5.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 40% · Weldability 20 / 100 · Formability (cold) 25 / 100 · Castability 30 / 100 · Brazeability / Solderability 45 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 5 kg CO₂/kg · Embodied Water 210 L/kg25.2 gal/lb · Typical Recycled Content 25%
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.
ATS-34 QT 55-57HRC vs ATS-34 QT 60-62HRC CRYO — frequently asked
Is ATS-34 QT 60-62HRC CRYO stronger than ATS-34 QT 55-57HRC?
Yes. ATS-34 QT 60-62HRC CRYO has a typical yield strength of 1,950 MPa (283 ksi) against 1,650 MPa (239 ksi) for ATS-34 QT 55-57HRC — about 18% more. Tensile strength is 2,100 MPa (305 ksi) vs 1,850 MPa (268 ksi).
Which condition does FabDigit quote by default, QT 55-57HRC or QT 60-62HRC CRYO?
Annealed is the default ATS-34 condition in the FabDigit quote flow (neither QT 55-57HRC nor QT 60-62HRC CRYO). 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, ATS-34 QT 55-57HRC or ATS-34 QT 60-62HRC CRYO?
ATS-34 QT 55-57HRC, by a small margin. Both rate not recommended for machinability — 8/100 against 3/100 for ATS-34 QT 60-62HRC CRYO.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ATS-34 QT 55-57HRC and ATS-34 QT 60-62HRC CRYO 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.