Structural Steel
S355JR · 1.0045
Also known as St52-3 / A572 Gr.50 / SM490
High-strength low-carbon structural steel for load-bearing frames and profiles.
S355JR (material 1.0045, formerly St52-3) is a high-strength low-alloy structural steel with a minimum yield strength of 355 MPa and good weldability. One of the most widely used grades for steel structures, it is supplied as bars, cold-drawn bar, merchant sections and profiles (IPE, UPN, HEB), plate and sheet.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN 10025-2. Mill certificate governs.
| Element | % |
|---|---|
| C | ≤ 0.24 |
| Si | ≤ 0.55 |
| Mn | ≤ 1.60 |
| P | ≤ 0.035 |
| S | ≤ 0.035 |
| N | ≤ 0.012 |
Mechanical properties.
Indicative values for a reference section and heat-treatment condition. Actual properties vary with dimension and treatment, and are confirmed on the mill certificate.
Available forms.
Size: Bars Ø 8–250 mm · profiles per section · flats, plates & sheet to specification
Typical applications.
- Steel structures & frames
- Bridges & platforms
- Industrial buildings
- Heavy fabrication
FAQ.
What is S355JR?
S355JR (material 1.0045, formerly St52-3) is a high-strength low-alloy structural steel with a minimum yield strength of 355 MPa and good weldability. One of the most widely used grades for steel structures, it is supplied as bars, cold-drawn bar, merchant sections and profiles (IPE, UPN, HEB), plate and sheet.
Is S355JR the same as St52-3?
Yes — S355JR and St52-3, A572 Gr.50, SM490 are matching designations for the same steel across different standards (EN, AISI/SAE, JIS, GB, former DIN). They are near equivalents and may differ slightly in chemistry, so the mill certificate governs the exact specification.
What are the international equivalents of S355JR?
S355JR corresponds to S355JR (1.0045) (EN), St52-3 (former DIN), A572 Gr.50 (near) (ASTM), SM490 (near) (JIS), Q355 (GB). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is S355JR available?
S355JR is supplied as Round bar, Flat bar, Square bar, Equal angle, Bright / cold-drawn bar, Profile (IPE/UPN/HEB), Plate / sheet, in Bars Ø 8–250 mm · profiles per section (bar diameter; flats, plates and sheet are quoted to specification).
What is S355JR used for?
Typical applications include Steel structures & frames, Bridges & platforms, Industrial buildings, Heavy fabrication.