S275JR -- the basic, most economical structural steel between S235 and S355. Re>=275 MPa, room-temperature impact only. For general fabrication, machine frames and light-to-medium structural steelwork where cold-climate toughness is not a design driver.
Standards
| Standard Body |
Designation |
Country |
| EN 10025-2 |
S275JR / 1.0044 |
EU |
| DIN W.Nr |
1.0044 |
Germany |
| ASTM |
A572 Grade 40 (nearest) |
USA |
| JUS |
C.0361 |
Yugoslavia/BiH |
Composition (wt.%)
| Element |
Symbol |
Min % |
Max % |
Typical % |
| Carbon |
C |
— |
0.210 |
0.170 |
| Manganese |
Mn |
— |
1.500 |
1.250 |
| Silicon |
Si |
— |
0.400 |
0.220 |
Physical
Melting Range
1490 – 1530
°C
Thermal Conductivity
49
W/mK
Thermal Expansion
12
×10⁻⁶/K
Machinability
| Rating |
56.0% (B1112=100%) |
| Turning HSS |
31.0 m/min |
| Turning Carbide |
142.0 m/min |
| Surface Finish |
Ra 0.8-3.2 um |
| Coolant |
Soluble oil 5-8% |
Mechanical
| Condition |
Rm (MPa) | Re (MPa) | A (%) |
HB | HRC | KV (J) | E (GPa) |
| As Rolled t<=16mm (+AR) |
410 – 560 |
≥275 |
≥21 |
— |
— |
27 |
210 |
Heat Treatment
| Process |
Temperature |
Medium |
Duration |
Hardness After |
| Normalizing (optional) |
870 – 910°C |
Still Air |
- |
Uniform grain |
| No pre-heat needed (t<=30mm) |
— |
CE~0.40 |
N/A |
N/A |
| Pre-heat for thick sections |
75 – 100°C |
Torch |
Pre-heat only |
N/A |
| NOT hardenable beyond as-rolled |
— |
Basic structural grade |
N/A |
N/A |
Applications
General Fabrication: Machine frames, brackets and general steelwork.
Indoor Structures: Indoor structural steelwork not requiring cold-climate toughness guarantee.
Light-Medium Structures: General construction elements between S235 and S355 strength requirements.
Notes
S275JR position: S235JR: Re 235 MPa, most basic/cheapest. S275JR: Re 275 MPa, ~17% stronger, similar cost and weldability. S355JR: Re 355 MPa, the workhorse for most serious structural work. S275 sees less use than S235 or S355 -- often the design either accepts S235 economy or steps straight to S355 strength.