What are the mechanical properties of S355JR steel?
S355JR is a high-strength structural steel with a minimum yield strength of 355 MPa, tensile strength of 470-630 MPa (depending on thickness), and significant elongation (around 20-22%), known for its good weldability and specified impact toughness (27 Joules at various temperatures) for applications like bridges, heavy machinery, and construction.
What the Designation "S355JR" Tells Us:
S: Structural steel.
355: Minimum yield strength in MPa for thicknesses ≤ 16mm.
J: Specifies the impact toughness test is conducted at +20°C.
R: Indicates a minimum Charpy V-notch impact energy requirement (27 J).
For comparison, other common grades in the same family are:
S355J0: Tested at 0°C (for colder environments).
S355J2: Tested at -20°C (for cold environments).
S355K2: Tested at -20°C with higher guaranteed impact energy (40 J avg).
Mechanical properties of steel S355JR
|
Nominal thickness, mm |
Minimum yield strength, MPa |
Strength limit, MPa |
|
<3 |
355 |
510-680 |
|
≥3 ≤ 16 |
355 |
470-630 |
|
> 16 ≤ 40 |
345 |
470-630 |
|
> 40 ≤ 63 |
335 |
470-630 |
|
> 63 ≤ 80 |
325 |
470-630 |
|
> 80 ≤ 100 |
315 |
470-630 |
|
> 100 ≤ 150 |
295 |
450-600 |
|
> 150 ≤ 200 |
285 |
450-600 |
|
> 200 ≤ 250 |
275 |
450-600 |
|
> 250 ≤ 400 |
265 |
450-600 |
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
