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; depends on dimension and heat treatment.
Available forms.
Size range: Bars Ø 8–250 mm · profiles per section
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 is the European (EN) designation, while St52-3, A572 Gr.50, SM490 are the matching names used in other countries and standards (for example AISI/SAE in the USA, JIS in Japan, GB in China, former DIN in Germany). They are near equivalents and may differ slightly in chemistry; 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.
What is S355JR used for?
Typical applications include Steel structures & frames, Bridges & platforms, Industrial buildings, Heavy fabrication.