Steel E235 +N vs E235 +SR
Steel · E235 temper comparison
E235 +N and E235 +SR are two conditions of the same steel grade, E235: +N (normalized) versus +SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. E235 +SR is the stronger of the two: yield strength 340 MPa (49.3 ksi) against 265 MPa (38.4 ksi) for E235 +N, about 28% more; tensile strength follows at 450 MPa (65.3 ksi) vs 420 MPa (60.9 ksi). In exchange, E235 +N is the more ductile: elongation 27% versus 15% for E235 +SR, and E235 +SR is harder (145 HB vs 130 HB).
E235 +NChoose it when the part is bent, formed or impact-loaded.
E235 +SRChoose it when strength drives the design.
E235 +N vs E235 +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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 55% · Compressive Strength 265 MPa38.4 ksi · Shear Strength 270 MPa39.2 ksi · Fracture Toughness (K_IC) 120 MPa·√m109 ksi·√in · Charpy V-Notch Impact (RT) 50 J36.9 ft·lbf · Hardness, Vickers 137 HV
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,460°C2,660 °F · Liquidus Temperature 1,520°C2,768 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 50 W/m·K28.9 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 247 J/g106 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 10.7 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 10 / 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 75 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 40 L/kg4.8 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.
E235 +N vs E235 +SR — frequently asked
Is E235 +SR stronger than E235 +N?
Yes. E235 +SR has a typical yield strength of 340 MPa (49.3 ksi) against 265 MPa (38.4 ksi) for E235 +N — about 28% more. Tensile strength is 450 MPa (65.3 ksi) vs 420 MPa (60.9 ksi).
Which condition does FabDigit quote by default, +N or +SR?
+N is the default E235 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.
When should I choose E235 +N over E235 +SR?
Pick E235 +N when the part is bent, formed or impact-loaded. Pick E235 +SR when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E235 +N and E235 +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.