S235J0 and S275J0 are both European standard (EN 10025) non-alloy structural steels, with the main difference being strength: S275J0 has a higher minimum yield strength (275 MPa) than S235J0 (235 MPa), allowing it to bear greater loads and potentially use thinner plates for weight savings, while both 'J0' grades offer better notch toughness at lower temperatures than the basic 'JR' grades due to stricter controls on phosphorus and sulfur content.
Chemical Composition of s235J0
|
Element |
Composition (% by weight) |
|---|---|
|
Carbon (C) |
0.17 max |
|
Manganese (Mn) |
1.40 max |
|
Phosphorus (P) |
0.035 max |
|
Sulfur (S) |
0.035 max |
|
Silicon (Si) |
0.55 max |
|
Copper (Cu) |
0.55 max |
|
Nitrogen (N) |
0.012 max |
|
Iron (Fe) |
Balance |
Chemical Composition of S275J0
|
Grade |
Chemical composition % MAX |
|||||||
|
THICKNESS(MM) |
C |
Mn |
Si |
P |
S |
N |
Cu |
|
|
S275J0 |
≦40 |
0.18 |
1.5 |
~ |
0.03 |
0.03 |
0.012 |
0.55 |
Mechanical Propertie of s235J0
|
Property |
Value |
|---|---|
|
Yield Strength (min) |
235 MPa |
|
Tensile Strength |
360–510 MPa |
|
Elongation (min, 200 mm) |
24% |
|
Impact Toughness (Charpy V-notch) |
27 J at 0°C |
|
Hardness (HB, typical) |
120–170 HB |
Mechanical Propertie of S275J0
|
Mechanical properties MIN |
|||||||
|
S275J0 |
Yield Strength |
Tensile Strength |
Elongation in 2 in. |
||||
|
≦16 |
275 |
410-580 |
15 |
||||
|
>16, ≦100 |
235 |
||||||
|
>100 |
205 |
380-540 |
|||||
Key Differences
Yield Strength: S275J0 is stronger (275 MPa min.) than S235J0 (235 MPa min. for thinner sections).
Applications: S275J0 is used for more demanding structural jobs needing higher strength, while S235J0 is a general-purpose structural steel.
Chemical Composition: The 'J0' designation means both have lower Phosphorus (P) and Sulfur (S) content (≤ 0.030%) than 'JR' grades, improving their impact toughness at low temperatures (20°C).
In Summary
S235J0: Minimum yield 235 MPa, good general use, decent low-temp toughness.
S275J0: Minimum yield 275 MPa, higher strength for heavier loads, similar low-temp toughness to S235J0.
Choose S275J0 for stronger designs; use S235J0 for general construction where cost and availability (JR is common) are key, but remember J0 offers better low-temp performance than JR.
