Welding and Fabrication Characteristics of SM490 steel

SM490 steel is designed for superior weldability, which is one of the key reasons it dominates structural applications across Asia. Its chemical composition ensures low carbon equivalent values, allowing various welding methods including MIG, TIG, SMAW, and SAW.

Preheating is usually unnecessary for thinner sections, and when used for thicker plates or high-stress assemblies, a moderate preheat ensures stable joint performance. The steel exhibits excellent fusion and minimal risk of cracking or deformation after welding.

In fabrication workshops, SM490 steel is valued for its dimensional stability during cutting, bending, and machining. Plasma cutting and laser cutting techniques produce clean edges, minimizing secondary finishing work. For bending or rolling operations, SM490 responds smoothly without spring-back or edge tearing.

Post-weld treatments such as stress relief annealing further enhance toughness for critical structural components. Combined with its consistent mechanical performance, these properties make SM490 ideal for bridge trusses, crane booms, ship decks, and storage tank frames.

The excellent combination of weldability and strength ensures that SM490 steel meets global fabrication standards, providing efficiency, reliability, and long-term safety in modern steel engineering.

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