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S275JR

Intermediate structural steel 275 MPa yield. Between S235 and S355. Common for secondary structural members, purlins and general fabrication.

Structural Steels Structural Steel EN 10025-2S275JR EN 10025-2S275J0 / S275J2 DIN (obsolete)St44-2 / RSt44-2 ASTMA36 (nearest) +6
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Description

S275JR per EN 10025-2. Bridges the gap between S235 and S355. 275 MPa minimum yield provides about 17% more structural efficiency than S235. Used for secondary structural members, purlins, bracings, grating frames and general fabrication.

Key Properties β€” Hot Rolled (t<=16mm)
Rm (Tensile Strength)
410 – 560
MPa
Re / Rp0.2 (Yield)
275
MPa
Aβ‚… (Elongation)
β‰₯ 23.0
%
E (Young's Modulus)
210
GPa
Density
7.85
g/cmΒ³
Main Designations (10)
Standard BodyDesignationCountry / RegionNote
EN 10025-2 S275JR EU
EN 10025-2 S275J0 / S275J2 EU
DIN (obsolete) St44-2 / RSt44-2 Germany
ASTM A36 (nearest) USA
BS 43A (obsolete) / S275JR UK
JIS SS400 (nearest) Japan
GOST St4sp / St4ps Russia
UNS K02401 (nearest A36) USA (UNS)
GB Q275 China
JUS C.0361 / Č.0361 Yugoslavia Structural steel St44; JUS B.B1.100
Standards (10)
#Standard BodyDesignationCountry / RegionNote
1 EN 10025-2 S275JR EU β€”
2 EN 10025-2 S275J0 / S275J2 EU β€”
3 DIN (obsolete) St44-2 / RSt44-2 Germany β€”
4 ASTM A36 (nearest) USA β€”
5 BS 43A (obsolete) / S275JR UK β€”
6 JIS SS400 (nearest) Japan β€”
7 GOST St4sp / St4ps Russia β€”
8 UNS K02401 (nearest A36) USA (UNS) β€”
9 GB Q275 China β€”
10 JUS C.0361 / Č.0361 Yugoslavia Structural steel St44; JUS B.B1.100
All values in wt.%
C
Carbon
≀ 0.2100
Si
Silicon
~0.2500
Mn
Manganese
≀ 1.5000
P
Phosphorus
≀ 0.0400
S
Sulphur
≀ 0.0400
ElementSymbolMin %Max %Typical %
Carbon C β€” 0.2100 0.1800
Silicon Si β€” β€” 0.2500
Manganese Mn β€” 1.5000 1.2000
Phosphorus P β€” 0.0400 β€”
Sulphur S β€” 0.0400 β€”
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 Aβ‚… min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
Hot Rolled (t<=16mm) +AR 410 560 275 β€” 23.0 β€” 27.0 β€” β€” β€” β€” 210.0
Hot Rolled (16<t<=40mm) +AR 410 560 265 β€” 23.0 β€” 27.0 β€” β€” β€” β€” 210.0
Hot Rolled (t>40mm) +AR 400 540 255 β€” 23.0 β€” 27.0 β€” β€” β€” β€” 210.0
Physical Properties
Density
7.850
g/cmΒ³
Melting Point
1490–1525
Β°C
Young's Modulus
210.0
GPa
Poisson's Ratio
0.300
β€”
Thermal Conductivity
50.0
W/mΒ·K
Thermal Expansion
12.00
Γ—10⁻⁢ /K
Specific Heat
490
J/kgΒ·K
Electrical Resistivity
0.1950
¡Ω·m
Magnetic
Yes
 
Heat Treatment
Normalizing
Temperature:880Β°C – 940Β°C
Medium:Still Air
Duration:-
Cooling:Air cool
Hardness After:Standard
For heavy sections requiring fine grain.
Stress Relieving (after welding)
Temperature:530Β°C – 580Β°C
Medium:Furnace
Duration:1h per 25mm
Cooling:<=150 C/h
For dimensional stability.
Machinability
Machinability Rating
relative to AISI B1112 = 100%
65.0%
Moderate
Turning Speed (HSS)
40
m/min
Turning Speed (Carbide)
175
m/min
Feed Rate (Turning)
0.200
mm/rev
Drilling Speed (HSS)
28
m/min
Milling Speed (Carbide)
180
m/min
CoolantSoluble oil 5-8%
Chip FormationMedium chips
Tool MaterialCarbide P20; HSS M2
Surface FinishRa 1.6-6.3 um
Good machinability. Scale abrasive on outer pass.
Applications
Building Construction
Structural columns, beams, roof trusses and floor plates.
General Fabrication
General purpose structural steelwork, frames, supports.
Agricultural
Agricultural machinery frames and implement structures.
Technical Notes
βœ…
S275 vs S355
S275JR: lower cost, better weldability (CE 0.43 vs 0.47). S355J2: 30% higher strength. Use S275 when strength is not the limiting factor β€” saves material cost via lower alloying.