S355ML Equivalent ASTM A633Gr.C EN 10025-4 Supplier

 

S355ML Equivalent ASTM A633 Gr.C | EN 10025-4 Steel Plate

S355ML Equivalent ASTM A633 Grade C (Overview)

S355ML is a thermomechanically rolled, low-temperature steel grade specified in EN 10025-4. It offers high strength, excellent toughness at low temperatures, and good weldability due to its low carbon equivalent.
In the American ASTM system, the closest equivalent grade is ASTM A633 Grade C, a normalized high-strength steel used for welded structures, offshore platforms, and heavy machinery.

Although S355ML and A633 Gr.C are not identical, engineers commonly consider them comparable in terms of strength level, impact toughness, plate thickness availability, and mechanical behavior.

Chemical Composition Comparison (S355ML vs ASTM A633 Grade C)

Element (%)	S355ML (EN 10025-4)	ASTM A633 Gr.C
C	≤ 0.16	≤ 0.20
Mn	1.00 – 1.70	≤ 1.50
Si	≤ 0.60	≤ 0.45
P	≤ 0.025	≤ 0.035
S	≤ 0.020	≤ 0.040
Nb, V, Ti (Total micro-alloying)	Allowed	Allowed
CE (IIW)	≤ 0.43	≈ 0.45

 

Summary:
Both grades use micro-alloying (Nb, V, Ti) and controlled rolling to achieve strength.
S355ML has slightly lower P+S limits and slightly lower carbon content, offering better weldability.

Mechanical Properties (S355ML vs A633 Gr.C)

Property	S355ML	ASTM A633 Grade C
Yield Strength (ReH)	355 MPa (≤16mm), 345 MPa (16–40mm)	345 MPa
Tensile Strength (Rm)	470–630 MPa	490–620 MPa
Elongation	≥ 22%	≥ 20%
Impact Energy	27J at –50°C	27J at –40°C
Delivery Condition	TMCP	Normalized

Summary:

• S355ML performs better at lower temperatures (–50°C).
• A633 Gr.C has similar strength, slightly lower impact toughness.

Application Comparison

Both S355ML and ASTM A633 Grade C are widely used in structural and low-temperature environments:

Typical Applications

• Offshore platforms & structures
• Oil & gas equipment
• Shipbuilding and marine components
• Heavy machinery and cranes
• Welded structural beams
• Low-temperature storage tanks

Are S355ML and ASTM A633 Gr.C Fully Interchangeable?

Not 100%.
However, they are commonly treated as practical equivalents when:

• The engineering specification requires ~350 MPa yield strength
• Low-temperature toughness is required (–40°C to –50°C)
• Weldability and micro-alloyed composition are important
• Plate thickness is within the standard range

For critical applications, material substitution should be approved by the project engineer.

Gangsteel Supply Range

We supply both S355ML (EN 10025-4) and ASTM A633 Grade C with:

• Thickness: 6–200 mm
• Width: 1500–3500 mm
• Length: 6000–12000 mm
• UT Testing: EN 10160 S1–S3, ASTM A578 A/B/C
• Impact test temperatures: –20°C / –40°C / –50°C

Mill MTC includes EN 10204 3.1 or 3.2 certification.

 

Others relative propery of en 10025-4 S355ML