Steel S275JR · supply condition · default condition
Steel S275JR-HR
Properties of the HR condition, compared with the other S275JR tempers.
Default commodity condition for plate, sheet, sections and bar; choose for welded structures and general fabrication.
What is S275JR-HR?
S275JR-HR is S275JR supplied in the HR condition — default commodity condition for plate, sheet, sections and bar; choose for welded structures and general fabrication. S275JR-HR has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi). S275JR-HR 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).
Advantages
- Readily welded — 95/100, better than 97% of steel grades
- Easy to machine — 65/100, better than 93% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Forms and bends easily — 78/100, better than 91% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 88% of steel grades
Limitations
- Low strength — 300 MPa (43.5 ksi), worse than 86% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Low fracture toughness — 65 MPa·√m (59.2 ksi·√in), worse than 76% of steel grades
S275JR-HR properties
Typical room-temperature values for S275JR-HR — 12 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-HR 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-HR has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S275JR-HR 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-HR 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-HR 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-HR's machinability is good (65/100, better than 93% of steel grades); weldability excellent (95/100); formability very good (78/100).
Common Calculations5
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-HR
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-HR — frequently asked
What is S275JR-HR used for?
S275JR-HR 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-HR?
S275JR-HR has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is S275JR-HR 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-HR be welded?
Yes — weldability is rated excellent (95/100). 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-HR?
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-HR 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-HR?
S275JR-HR 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-HR?
Yes — S275JR-HR 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.