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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.

Ugljični čelici Structural Steel EN 10025-2S275JR / 1.0044 DIN W.Nr1.0044 ASTMA572 Grade 40 (nearest) JUSC.0361
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Opis

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.

Ključna svojstva — 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
Gustoća
7.85
g/cm³
Glavne oznake (4)
Standardno tijeloOznakaZemlja / RegionNapomena
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
Standardi (4)
#Standardno tijeloOznakaZemlja / RegionNapomena
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
Sve vrijednosti u masenim %
C
Carbon
≤ 0.2100
Mn
Manganese
≤ 1.5000
Si
Silicon
≤ 0.4000
ElementSimbolMin %Max %Tipično %
Carbon C — 0.2100 0.1700
Manganese Mn — 1.5000 1.2500
Silicon Si — 0.4000 0.2200
Mehanička svojstva
StanjeŠifra 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
Fizikalna svojstva
Gustoća
7.850
g/cm³
Tačka topljenja
1490–1530
°C
Youngov modul
210.0
GPa
Poissonov koeficijent
0.298
—
Topl. provodljivost
49.0
W/m·K
Topl. rastezanje
12.00
×10⁻⁶ /K
Specifična toplota
490
J/kg·K
El. otpornost
0.2050
µΩ·m
Magnetno
Da
 
Toplinska obrada
Normalizing (optional)
Temperatura:870°C – 910°C
Medium:Still Air
Trajanje:-
Hlađenje:Air cool
Tvrdoća nakon:Uniform grain
Optional -- standard as-rolled acceptable for most uses.
No pre-heat needed (t<=30mm)
Medium:CE~0.40
Trajanje:N/A
Hlađenje:N/A
Tvrdoća nakon:N/A
Pre-heat for thick sections
Temperatura:75°C – 100°C
Medium:Torch
Trajanje:Pre-heat only
Hlađenje:N/A
Tvrdoća nakon:N/A
For t>30 mm.
NOT hardenable beyond as-rolled
Medium:Basic structural grade
Trajanje:N/A
Hlađenje:N/A
Tvrdoća nakon:N/A
Obradivost
Indeks obradivosti
relativno prema AISI B1112 = 100%
56.0%
Teško
Brzina tokarenja (HSS)
31
m/min
Brzina tokarenja (karbid)
142
m/min
Posmak (tokarenje)
0.160
mm/rev
Brzina bušenja (HSS)
21
m/min
Brzina glodanja (karbid)
145
m/min
Rashladni fluidSoluble oil 5-8%
Oblici strugotineMedium chips
Rezni alatCarbide P20; HSS M2
Površinska hrapavostRa 0.8-3.2 um
Good machinability.
Primjena
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.
Tehničke napomene
✅
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.