Steel P235TR1 +C vs P235TR1 +SR
Steel · P235TR1 temper comparison
P235TR1 +C and P235TR1 +SR are two conditions of the same steel grade, P235TR1: +C (cold drawn) versus +SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. P235TR1 +C is the stronger of the two: yield strength 420 MPa (60.9 ksi) against 350 MPa (50.8 ksi) for P235TR1 +SR, about 20% more; tensile strength follows at 520 MPa (75.4 ksi) vs 470 MPa (68.2 ksi). In exchange, P235TR1 +SR is the more ductile: elongation 16% versus 10% for P235TR1 +C, and P235TR1 +C is harder (155 HB vs 140 HB). P235TR1 +SR runs hotter in service (300°C vs 250°C continuous).
P235TR1 +CChoose it when strength drives the design.
P235TR1 +SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
P235TR1 +C vs P235TR1 +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
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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 49 W/m·K28.3 BTU/hr·ft·°F · Specific Heat Capacity 460 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 · Min Service Temperature -10°C14 °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) -0.61 V · Corrosion Resistance 12 / 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 60 / 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) 2.1 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.
P235TR1 +C vs P235TR1 +SR — frequently asked
Is P235TR1 +C stronger than P235TR1 +SR?
Yes. P235TR1 +C has a typical yield strength of 420 MPa (60.9 ksi) against 350 MPa (50.8 ksi) for P235TR1 +SR — about 20% more. Tensile strength is 520 MPa (75.4 ksi) vs 470 MPa (68.2 ksi).
Which condition does FabDigit quote by default, +C or +SR?
+N is the default P235TR1 condition in the FabDigit quote flow (neither +C 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.
When should I choose P235TR1 +C over P235TR1 +SR?
Pick P235TR1 +C when strength drives the design. Pick P235TR1 +SR when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in P235TR1 +C and P235TR1 +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.