SM490C is a type of low-alloy high-strength structural steel plate widely used in engineering fields. Below is a detailed overview of its key characteristics, chemical composition, mechanical properties, applications, and related processing considerations:

 Basic Overview

Standard: Belongs to Japanese industrial standards, specifically specified in JIS G3106 (Rolled Steels for Welded Structure).

Category: Classified as a low-alloy steel, it contains a small amount of alloying elements (such as manganese, silicon, and trace amounts of niobium, vanadium) to enhance strength while maintaining good weldability and formability.

Primary Use: Designed for welded structural components, making it suitable for construction machinery, bridges, buildings, pressure vessels, and shipbuilding.

 

 Mechanical Properties

Yield Strength (YS): ≥325 MPa (for thickness ≤16mm; slightly lower for thicker plates, e.g., ≥295 MPa for 16-40mm)

Tensile Strength (TS): 490-610 MPa

Elongation: ≥21% (ensures good ductility for forming)

Impact Toughness: Adequate toughness at room temperature; can be optimized via heat treatment (e.g., normalizing) for low-temperature applications.

Hardness: Typically 150-200 HBW (after normalizing)

 

 

 

 

 

 

 

 

 Heat Treatment

Normalizing: Commonly used to refine grains, eliminate internal stress, and improve uniformity. The process involves heating to 880-940°C (above Ac3), holding for sufficient time, and air-cooling. This results in a fine ferrite-pearlite structure, balancing strength and toughness.

Annealing: Rarely used unless better machinability is required (lowers hardness but reduces strength).

Welding Heat Treatment: Post-weld heat treatment (PWHT) may be performed to relieve residual stresses in thick-walled components.

 

 

 

 

 

 

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