Steel 25KhGT QT 28-34HRC vs 25KhGT-QT200
Steel · 25KhGT temper comparison
25KhGT QT 28-34HRC and 25KhGT-QT200 are two conditions of the same steel grade, 25KhGT: QT 28-34HRC (Q&T to 28–34 HRC) versus QT200 (Q&T). The chemistry is identical, so every difference below comes from the condition. 25KhGT-QT200 is the stronger of the two: yield strength 1,220 MPa (177 ksi) against 850 MPa (123 ksi) for 25KhGT QT 28-34HRC, about 44% more; tensile strength follows at 1,420 MPa (206 ksi) vs 1,000 MPa (145 ksi). In exchange, 25KhGT QT 28-34HRC is the more ductile: elongation 13% versus 9% for 25KhGT-QT200, and 25KhGT-QT200 is harder (415 HB vs 300 HB). 25KhGT QT 28-34HRC runs hotter in service (400°C vs 180°C continuous). On the shop floor, 25KhGT QT 28-34HRC machines more easily (fair vs poor).
25KhGT QT 28-34HRCChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
25KhGT-QT200Choose it when strength drives the design.
25KhGT QT 28-34HRC vs 25KhGT-QT200: 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.
25KhGT QT 28-34HRC25KhGT-QT200
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 212 GPa30.7 Msi · Shear Modulus 82 GPa11.9 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Compressive Strength 400 MPa58 ksi · Shear Strength 380 MPa55.1 ksi · Hardness, Rockwell B 92 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 40 W/m·K23.1 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.5 % IACS · Electrical Resistivity 2.3×10⁻⁷ Ω·m9.06 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 11 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 30 / 100 · Formability (cold) 48 / 100 · Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
25KhGT QT 28-34HRC vs 25KhGT-QT200 — frequently asked
Is 25KhGT-QT200 stronger than 25KhGT QT 28-34HRC?
Yes. 25KhGT-QT200 has a typical yield strength of 1,220 MPa (177 ksi) against 850 MPa (123 ksi) for 25KhGT QT 28-34HRC — about 44% more. Tensile strength is 1,420 MPa (206 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, QT 28-34HRC or QT200?
A is the default 25KhGT condition in the FabDigit quote flow (neither QT 28-34HRC nor QT200). 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, 25KhGT QT 28-34HRC or 25KhGT-QT200?
25KhGT QT 28-34HRC. Its machinability rates fair (45/100) against poor (30/100) for 25KhGT-QT200.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 25KhGT QT 28-34HRC and 25KhGT-QT200 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.