Steel 18Cr2Ni4WA-A vs 18Cr2Ni4WA-QT200
Steel · 18Cr2Ni4WA temper comparison
18Cr2Ni4WA-A and 18Cr2Ni4WA-QT200 are two conditions of the same steel grade, 18Cr2Ni4WA: A (solution annealed) versus QT200 (quenched + low temper 200 °C). The chemistry is identical, so every difference below comes from the condition. 18Cr2Ni4WA-QT200 is the stronger of the two: yield strength 1,150 MPa (167 ksi) against 640 MPa (92.8 ksi) for 18Cr2Ni4WA-A, about 80% more; tensile strength follows at 1,350 MPa (196 ksi) vs 850 MPa (123 ksi). In exchange, 18Cr2Ni4WA-A is the more ductile: elongation 18% versus 13% for 18Cr2Ni4WA-QT200, and 18Cr2Ni4WA-QT200 is harder (400 HB vs 250 HB). 18Cr2Ni4WA-A runs hotter in service (400°C vs 180°C continuous). On the shop floor, 18Cr2Ni4WA-A machines more easily (fair vs poor).
18Cr2Ni4WA-AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
18Cr2Ni4WA-QT200Choose it when strength drives the design.
18Cr2Ni4WA-A vs 18Cr2Ni4WA-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.
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.3 · Compressive Strength 1,150 MPa167 ksi · Shear Strength 810 MPa117 ksi · Fracture Toughness (K_IC) 80 MPa·√m72.8 ksi·√in · Hardness, Vickers 420 HV
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 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 30 W/m·K17.3 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -70°C-94 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 5.5 % IACS · Electrical Resistivity 3.1×10⁻⁷ Ω·m12.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.58 V · Corrosion Resistance 14 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 20 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.8 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 25%
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.
18Cr2Ni4WA-A vs 18Cr2Ni4WA-QT200 — frequently asked
Is 18Cr2Ni4WA-QT200 stronger than 18Cr2Ni4WA-A?
Yes. 18Cr2Ni4WA-QT200 has a typical yield strength of 1,150 MPa (167 ksi) against 640 MPa (92.8 ksi) for 18Cr2Ni4WA-A — about 80% more. Tensile strength is 1,350 MPa (196 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, A or QT200?
QT200 is the default 18Cr2Ni4WA 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, 18Cr2Ni4WA-A or 18Cr2Ni4WA-QT200?
18Cr2Ni4WA-A. Its machinability rates fair (40/100) against poor (20/100) for 18Cr2Ni4WA-QT200.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 18Cr2Ni4WA-A and 18Cr2Ni4WA-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.