Steel A842 Grade 400-F vs A842 Grade 400-SR
Steel · A842 Grade 400 temper comparison
A842 Grade 400-F and A842 Grade 400-SR are two conditions of the same steel grade, A842 Grade 400: F (as fabricated) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 350 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (as fabricated versus stress relieved). A842 Grade 400-F is harder — 17 HRC against 15 HRC for A842 Grade 400-SR — which matters for wear surfaces and threads.
A842 Grade 400-FChoose it when surface hardness matters.
A842 Grade 400-F vs A842 Grade 400-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 400-FA842 Grade 400-SR
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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 145 GPa21 Msi · Shear Modulus 57 GPa8.3 Msi · Bulk Modulus 100 GPa14.5 Msi · Poisson's Ratio 0.26 · Fracture Toughness (K_IC) 24 MPa·√m21.8 ksi·√in
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 1,170°C2,138 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 37 W/m·K21.4 BTU/hr·ft·°F · Specific Heat Capacity 460 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 · Max Service Temperature (continuous) 350°C662 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
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
Same in both: Formability (cold) 5 / 100 · Castability 55 / 100 · Brazeability / Solderability 40 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 20 MJ/kg8,598 BTU/lb · Embodied Carbon (primary production) 1.8 kg CO₂/kg · Embodied Water 30 L/kg3.6 gal/lb · Typical Recycled Content 80%
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 400-F vs A842 Grade 400-SR — frequently asked
What is the difference between A842 Grade 400-F and A842 Grade 400-SR?
A842 Grade 400-F and A842 Grade 400-SR are two conditions of the same steel grade, A842 Grade 400: F (as fabricated) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 350 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (as fabricated versus stress relieved).
Which condition does FabDigit quote by default, F or SR?
F is the default A842 Grade 400 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 welds better, A842 Grade 400-F or A842 Grade 400-SR?
A842 Grade 400-SR. Its weldability rates fair (35/100) against poor (30/100) for A842 Grade 400-F.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A842 Grade 400-F and A842 Grade 400-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.