S355ML Equivalent JIS SM490A EN 10025-4 Steel Supplier

S355ML Equivalent JIS SM490A | EN 10025-4 Steel Plate

Overview of S355ML and Its Japanese Equivalent SM490A

S355MLis a thermomechanically rolled, low-temperature, high-strength structural steel specified in EN 10025-4. It offers a minimum yield strength of 355 MPa and excellent toughness at low temperatures (–50°C typical), making it suitable for offshore, bridges, heavy machinery, and welded structures.

In the Japanese JIS G3106 standard, the closest comparable grade is SM490A, a weldable structural steel used for bridges, marine structures, and building frameworks.
Although SM490A is not fully identical to S355ML, engineers often treat them as practical equivalents in strength-level and application range.

Chemical Composition Comparison (S355ML vs JIS SM490A)

Summary:

• S355ML has stricter P+S limits.
• S355ML uses TMCP and micro-alloying, giving better weldability and toughness.
• SM490A has slightly higher carbon and no mandatory low-temperature requirements.

Mechanical Properties Comparison

Summary:

• S355ML has superior low-temperature impact toughness.
• SM490A is suitable for general structural use but does not require low-temperature toughness testing.
• Strength levels are broadly similar, although S355ML is more reliable in extreme cold environments.

Application Comparison

Both grades are used in structural engineering, but S355ML is preferred for low-temperature service:

S355ML Typical Applications

• Offshore platforms
• LNG and low-temperature equipment
• Bridges
• High-rise structures
• Wind towers
• Heavy machinery
• Crane booms

SM490A Typical Applications

• Building structures
• Bridges
• General welded construction
• Marine structures
• Machinery parts

Are S355ML and SM490A Interchangeable?

Partially.

They are often considered equivalent when:

• The project requires ~355 MPa yield strength
• The environment is normal temperature
• Toughness requirements are moderate
• Plate thickness is within typical structural ranges

However, SM490A does not meet low-temperature impact requirements.
For cold regions, offshore structures, or –20°C / –40°C / –50°C service, S355ML is the correct material.

Gangsteel Supply Range

We supply both S355ML and JIS SM490A with:

• Thickness: 6–200 mm
• Width: 1500–3500 mm
• Length: 6000–12000 mm
• UT Testing: EN10160 or JIS ultrasonic levels
• Impact test: –20°C / –40°C / –50°C available for S355ML

Mill certificates: EN 10204 3.1 or 3.2.

Others relative propery of en 10025-4 S355ML