Steel A842 Grade 300-ANN vs A842 Grade 300-SR
Steel · A842 Grade 300 temper comparison
A842 Grade 300-ANN and A842 Grade 300-SR are two conditions of the same steel grade, A842 Grade 300: ANN (annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 215 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus stress relieved). A842 Grade 300-ANN is the more ductile: elongation 4% versus 2.5% for A842 Grade 300-SR, and A842 Grade 300-SR is harder (165 HB vs 150 HB). A842 Grade 300-ANN runs hotter in service (450°C vs 400°C continuous) and A842 Grade 300-ANN conducts heat better (42 W/m·K vs 37 W/m·K).
A842 Grade 300-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
A842 Grade 300-ANN vs A842 Grade 300-SR: 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.
A842 Grade 300-ANNA842 Grade 300-SR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Shear Modulus 57 GPa8.3 Msi · Bulk Modulus 101 GPa14.6 Msi · Poisson's Ratio 0.26
Physical
Density and transition temperatures.
Same in both: Density 7.1 g/cm³0.26 lb/in³ · Melting Point (Solidus) 1,150°C2,102 °F · Liquidus Temperature 1,180°C2,156 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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 220 J/g94.6 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 16 / 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: Castability 65 / 100 · Brazeability / Solderability 40 / 100 · Polishability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 19 MJ/kg8,169 BTU/lb · Embodied Carbon (primary production) 1.7 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 90%
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.
A842 Grade 300-ANN vs A842 Grade 300-SR — frequently asked
What is the difference between A842 Grade 300-ANN and A842 Grade 300-SR?
A842 Grade 300-ANN and A842 Grade 300-SR are two conditions of the same steel grade, A842 Grade 300: ANN (annealed) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 215 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus stress relieved).
Which condition does FabDigit quote by default, ANN or SR?
AS-CAST is the default A842 Grade 300 condition in the FabDigit quote flow (neither ANN nor SR). 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, A842 Grade 300-ANN or A842 Grade 300-SR?
A842 Grade 300-ANN, by a small margin. Both rate fair for machinability — 50/100 against 42/100 for A842 Grade 300-SR; for welding the order is A842 Grade 300-ANN first (poor, 30/100) then A842 Grade 300-SR (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in A842 Grade 300-ANN and A842 Grade 300-SR 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.