Steel S275JR · supply condition
Steel S275JR-CR
Properties of the CR condition, compared with the other S275JR tempers.
Choose for thin sheet or bar needing tight tolerance, smooth surface and higher yield; ductility and bendability are reduced.
What is S275JR-CR?
S275JR-CR is S275JR supplied in the CR condition — choose for thin sheet or bar needing tight tolerance, smooth surface and higher yield; ductility and bendability are reduced. S275JR-CR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 67% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi). S275JR-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). HR is the default condition FabDigit quotes; CR is available on request or by drawing note.
Advantages
- Easy to machine — 65/100, better than 93% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 88% of steel grades
- High electrical conductivity — 10 % IACS, better than 82% of steel grades
Limitations
- Low fracture toughness — 65 MPa·√m (59.2 ksi·√in), worse than 76% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
S275JR-CR properties
Typical room-temperature values for S275JR-CR — 11 properties are specific to this condition; the rest are grade-level values shared by every S275JR temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
S275JR-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
S275JR-CR has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 67% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S275JR-CR is rated for continuous service to 350°C (662 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 88% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
S275JR-CR conducts electricity at 10 % IACS, better than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 87% of steel grades.
Sustainability4
Producing a kilogram of S275JR-CR takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability6
S275JR-CR's machinability is good (65/100, better than 93% of steel grades); weldability excellent (92/100); formability good (60/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other S275JR tempers and conditions
S275JR is also supplied in 3 other conditions. The full side-by-side table is on the S275JR overview.
- HRDefaultDefault commodity condition for plate, sheet, sections and bar; choose for welded structures and general fabrication.300 MPa yield · 130 HB
- CRChoose for thin sheet or bar needing tight tolerance, smooth surface and higher yield; ductility and bendability are reduced.380 MPa yield · 160 HB
- GalvanizedUse outdoors or in damp service where painting is impractical; base mechanicals unchanged but service temperature is limited by the zinc layer.300 MPa yield · 130 HB
- NPick for heavier plate where a fine, uniform grain and better through-thickness toughness and bend behaviour are wanted.295 MPa yield · 125 HB
Working with S275JR-CR
Is S275JR easy to machine?
Free machining at moderate speeds with HSS or coated carbide; gummy chips and built-up edge in hot-rolled state — use positive rake, generous feed and coolant.
Can S275JR be welded?
Weldable by all common processes (SMAW/GMAW/SAW/FCAW) with E7018 or ER70S-6 class consumables; preheat normally unnecessary below ~30 mm, keep hydrogen low on thick restrained joints.
Can S275JR be formed, bent or molded?
Good cold bending and roll forming; typical inside bend radius 1–2 t for hot-rolled plate, hot work at 900–1200 °C, avoid forming in the 250–400 °C blue-brittle range.
What surface finishes work on S275JR?
Must be coated — shot blast then paint/primer, hot-dip galvanize (Si-controlled heats for smooth coating), or zinc-rich/powder coat; no anodizing (ferrous).
S275JR chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cmax 0.21 for t ≤ 16 mm; 0.22 above (flat products) | ≤ 0.21 | 0.17 |
| Mn | ≤ 1.5 | 0.8 |
| Sinot specified in EN 10025-2; typical mill level | ≈ 0.2 | 0.2 |
| P0.040 max for long products | ≤ 0.04 | 0.02 |
| S0.040 max for long products | ≤ 0.04 | 0.02 |
| N | ≤ 0.01 | 0.01 |
| Cu | ≤ 0.55 | 0.2 |
| Febalance; CEV ≤ 0.40 | balance | — |
S275JR-CR — frequently asked
What is S275JR-CR used for?
S275JR-CR is typically used for welded bridge components, industrial building frames, machine frames and weldment bases, structural beams, channels and angles, base plates and mounting brackets and agricultural and materials-handling equipment frames. In short: workhorse structural plate.
What is the yield strength of S275JR-CR?
S275JR-CR has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 67% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is S275JR-CR easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Free machining at moderate speeds with HSS or coated carbide; gummy chips and built-up edge in hot-rolled state — use positive rake, generous feed and coolant.
Can S275JR-CR be welded?
Yes — weldability is rated excellent (92/100). Weldable by all common processes (SMAW/GMAW/SAW/FCAW) with E7018 or ER70S-6 class consumables; preheat normally unnecessary below ~30 mm, keep hydrogen low on thick restrained joints.
What surface finishes work on S275JR-CR?
Must be coated — shot blast then paint/primer, hot-dip galvanize (Si-controlled heats for smooth coating), or zinc-rich/powder coat; no anodizing (ferrous).
Can S275JR-CR be formed, bent or molded?
Good cold bending and roll forming; typical inside bend radius 1–2 t for hot-rolled plate, hot work at 900–1200 °C, avoid forming in the 250–400 °C blue-brittle range.
What is the maximum service temperature of S275JR-CR?
S275JR-CR is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S275JR-HR and S275JR-CR?
HR is the default condition — default commodity condition for plate, sheet, sections and bar; choose for welded structures and general fabrication. CR: choose for thin sheet or bar needing tight tolerance, smooth surface and higher yield; ductility and bendability are reduced. Yield strength is 300 MPa in HR versus 380 MPa in CR.
Can FabDigit make parts in S275JR-CR?
Yes — S275JR-CR is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10025-2 Hot rolled products of structural steels — Non-alloy structural steels — CEN (2019)
- EN 10027-2 / material number 1.0044 — CEN (2015)
- GB/T 700 (Q275 comparison) — SAC (2006)
- EN 1993-1-1 / EN 1993-1-2 (design and thermal properties of structural steel) — CEN (2005)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Structural steel plate grade datasheets (ArcelorMittal, Tata Steel Europe) — producers (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.