Home/ Carbon Steels / S275JR (Basic Structural Steel)

S275JR (Basic Structural Steel)

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.

Carbon Steels Structural Steel EN 10025-2S275JR / 1.0044 DIN W.Nr1.0044 ASTMA572 Grade 40 (nearest) JUSC.0361
Download PDF Carbon Steels
Description

S275JR per EN 10025-2 (1.0044). Basic structural grade, no guaranteed low-temperature toughness (JR = +20 C impact only). Re>=275 MPa gives about 17% more strength than S235 at similar weldability (CE~0.40) and cost. Standard for general steel fabrication, indoor machine frames, and structural steelwork in temperate/indoor conditions.

Key Properties — As Rolled t<=16mm
Rm (Tensile Strength)
410 – 560
MPa
Re / Rp0.2 (Yield)
275
MPa
A₅ (Elongation)
≥ 21.0
%
E (Young's Modulus)
210
GPa
Density
7.85
g/cm³
Main Designations (4)
Standard BodyDesignationCountry / RegionNote
EN 10025-2 S275JR / 1.0044 EU
DIN W.Nr 1.0044 Germany
ASTM A572 Grade 40 (nearest) USA
JUS C.0361 Yugoslavia/BiH S275JR osnovni konstrukcioni celik; JUS B.B2.030
Standards (4)
#Standard BodyDesignationCountry / RegionNote
1 EN 10025-2 S275JR / 1.0044 EU —
2 DIN W.Nr 1.0044 Germany —
3 ASTM A572 Grade 40 (nearest) USA —
4 JUS C.0361 Yugoslavia/BiH S275JR osnovni konstrukcioni celik; JUS B.B2.030
All values in wt.%
C
Carbon
≤ 0.2100
Mn
Manganese
≤ 1.5000
Si
Silicon
≤ 0.4000
ElementSymbolMin %Max %Typical %
Carbon C — 0.2100 0.1700
Manganese Mn — 1.5000 1.2500
Silicon Si — 0.4000 0.2200
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 A₅ min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
As Rolled t<=16mm +AR 410 560 275 — 21.0 — 27.0 — — — — 210.0
Physical Properties
Density
7.850
g/cm³
Melting Point
1490–1530
°C
Young's Modulus
210.0
GPa
Poisson's Ratio
0.298
—
Thermal Conductivity
49.0
W/m·K
Thermal Expansion
12.00
×10⁻⁶ /K
Specific Heat
490
J/kg·K
Electrical Resistivity
0.2050
µΩ·m
Magnetic
Yes
 
Heat Treatment
Normalizing (optional)
Temperature:870°C – 910°C
Medium:Still Air
Duration:-
Cooling:Air cool
Hardness After:Uniform grain
Optional -- standard as-rolled acceptable for most uses.
No pre-heat needed (t<=30mm)
Medium:CE~0.40
Duration:N/A
Cooling:N/A
Hardness After:N/A
Pre-heat for thick sections
Temperature:75°C – 100°C
Medium:Torch
Duration:Pre-heat only
Cooling:N/A
Hardness After:N/A
For t>30 mm.
NOT hardenable beyond as-rolled
Medium:Basic structural grade
Duration:N/A
Cooling:N/A
Hardness After:N/A
Machinability
Machinability Rating
relative to AISI B1112 = 100%
56.0%
Difficult
Turning Speed (HSS)
31
m/min
Turning Speed (Carbide)
142
m/min
Feed Rate (Turning)
0.160
mm/rev
Drilling Speed (HSS)
21
m/min
Milling Speed (Carbide)
145
m/min
CoolantSoluble oil 5-8%
Chip FormationMedium chips
Tool MaterialCarbide P20; HSS M2
Surface FinishRa 0.8-3.2 um
Good machinability.
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.
Technical 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.