The JIS G3106 SM490B Equivalent carbon steel plate

SM490B steel is a low carbon, welding structural steel grade under the JIS G3106 standard. Due to its low carbon equivalent, it exhibits excellent weldability and good cold forming performance, making it suitable for components that require cutting, welding, bending, and machining.

SM490B steel plates are commonly supplied in hot rolled or controlled rolling delivery conditions to ensure stable mechanical properties and uniform structure.

Compared with ordinary structural steel, SM490B offers higher strength and toughness, allowing engineers to reduce material thickness and weight, while still maintaining structural safety and durability.

SM490B Applications

SM490B steel plate is widely used in construction, machinery, shipbuilding, and manufacturing industries. Typical applications include:

Construction and Building Structures
Columns, beams, frames, trusses, and fabricated steel structures for industrial plants and commercial buildings.

Boiler and Pressure Vessel Components
Due to its stable mechanical performance and weldability, it is suitable for medium-strength pressure-bearing applications.

Container and Storage Tank Fabrication
Used in storage tanks, container frames, and structural panels.

Shipbuilding and Offshore Engineering
Suitable for hull structures, deck components, and support frames.

General Mechanical and Manufacturing Uses
Cranes, construction machinery frames, bridges, highway guardrails, and rail transit equipment.

Surface Treatment Options for SM490B Steel

To meet different environmental and corrosion resistance requirements, SM490B steel plates can be provided with diverse surface finishes:

Black Painted - Basic anti-rust coating for storage and transportation.

PE / PVC Coated - Surface protection during laser cutting, bending, or forming operations.

Galvanized (Zinc Coating) - Enhanced corrosion resistance, suitable for outdoor exposure.

Color Coated / Pre-Painted - Decorative and protective coating for architectural use.

SM490B Equivalent Grades

The following table lists commonly accepted equivalent or comparable grades in different standards and regions.
(Note: Exact equivalence varies by specification; mechanical comparison is recommended when replacing materials.)