Steel A387 Gr 22L Class 1-A vs A387 Gr 22L Class 1 Q+T
Steel · A387 Gr 22L Class 1 temper comparison
A387 Gr 22L Class 1-A and A387 Gr 22L Class 1 Q+T are two conditions of the same steel grade, A387 Gr 22L Class 1: A (solution annealed) versus Q+T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. A387 Gr 22L Class 1 Q+T is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 270 MPa (39.2 ksi) for A387 Gr 22L Class 1-A, about 41% more; tensile strength follows at 530 MPa (76.9 ksi) vs 450 MPa (65.3 ksi). In exchange, A387 Gr 22L Class 1-A is the more ductile: elongation 28% versus 24% for A387 Gr 22L Class 1 Q+T, and A387 Gr 22L Class 1 Q+T is harder (165 HB vs 135 HB). On the shop floor, A387 Gr 22L Class 1-A machines more easily (good vs fair).
A387 Gr 22L Class 1-AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
A387 Gr 22L Class 1 Q+TChoose it when strength drives the design.
A387 Gr 22L Class 1-A vs A387 Gr 22L Class 1 Q+T: 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.
A387 Gr 22L Class 1-AA387 Gr 22L Class 1 Q+T
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.4 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 540°C1,004 °F · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 20 / 100
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 45 / 100 · Polishability 50 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 20%
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.
A387 Gr 22L Class 1-A vs A387 Gr 22L Class 1 Q+T — frequently asked
Is A387 Gr 22L Class 1 Q+T stronger than A387 Gr 22L Class 1-A?
Yes. A387 Gr 22L Class 1 Q+T has a typical yield strength of 380 MPa (55.1 ksi) against 270 MPa (39.2 ksi) for A387 Gr 22L Class 1-A — about 41% more. Tensile strength is 530 MPa (76.9 ksi) vs 450 MPa (65.3 ksi).
Which condition does FabDigit quote by default, A or Q+T?
N+T is the default A387 Gr 22L Class 1 condition in the FabDigit quote flow (neither A nor Q+T). 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, A387 Gr 22L Class 1-A or A387 Gr 22L Class 1 Q+T?
A387 Gr 22L Class 1-A. Its machinability rates good (60/100) against fair (50/100) for A387 Gr 22L Class 1 Q+T; for welding the order is A387 Gr 22L Class 1-A first (very good, 70/100) then A387 Gr 22L Class 1 Q+T (good, 62/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A387 Gr 22L Class 1-A and A387 Gr 22L Class 1 Q+T 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.