Stainless Steel ATS-34 QT 55-57HRC vs ATS-34 QT 58-60HRC
Stainless Steel · ATS-34 temper comparison
ATS-34 QT 55-57HRC and ATS-34 QT 58-60HRC are two conditions of the same stainless steel grade, ATS-34: QT 55-57HRC versus QT 58-60HRC. The chemistry is identical, so every difference below comes from the condition. ATS-34 QT 58-60HRC is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 1,650 MPa (239 ksi) for ATS-34 QT 55-57HRC, about 12% more; tensile strength follows at 2,000 MPa (290 ksi) vs 1,850 MPa (268 ksi). In exchange, ATS-34 QT 55-57HRC is the more ductile: elongation 3% versus 2% for ATS-34 QT 58-60HRC, and ATS-34 QT 58-60HRC is harder (690 HV vs 620 HV). ATS-34 QT 55-57HRC runs hotter in service (250°C vs 180°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 58-60HRCChoose it when strength drives the design.
ATS-34 QT 55-57HRC vs ATS-34 QT 58-60HRC: 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 58-60HRC
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
Polishability
Same in both: Machinability Rating (AISI 1212 = 100 %) 40% · Weldability 20 / 100 · Formability (cold) 25 / 100 · Castability 30 / 100 · Brazeability / Solderability 45 / 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 58-60HRC — frequently asked
Is ATS-34 QT 58-60HRC stronger than ATS-34 QT 55-57HRC?
Yes. ATS-34 QT 58-60HRC has a typical yield strength of 1,850 MPa (268 ksi) against 1,650 MPa (239 ksi) for ATS-34 QT 55-57HRC — about 12% more. Tensile strength is 2,000 MPa (290 ksi) vs 1,850 MPa (268 ksi).
Which condition does FabDigit quote by default, QT 55-57HRC or QT 58-60HRC?
Annealed is the default ATS-34 condition in the FabDigit quote flow (neither QT 55-57HRC nor QT 58-60HRC). 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.
When should I choose ATS-34 QT 55-57HRC over ATS-34 QT 58-60HRC?
Pick ATS-34 QT 55-57HRC when the part is bent, formed or impact-loaded, or when the part sees heat. Pick ATS-34 QT 58-60HRC when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ATS-34 QT 55-57HRC and ATS-34 QT 58-60HRC 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.