24 Dec How Steel is Used in the Transportation Industry

Steel in Modern Vehicles

Steel is essential to automotive manufacturing. It accounts for about 50-60% of a typical vehicle’s weight despite increasing competition from aluminium and composites. Steel’s unmatched combination of strength, formability, cost-effectiveness, and recyclability, are qualities that make it indispensable across almost every part of a vehicle.

In modern times, the automotive industry’s relationship with steel has changed because of two seemingly contradictory demands. Vehicles need to be lighter to improve fuel efficiency and reduce emissions, but, at the same time, they must also be stronger to meet stringent safety regulations.

Automotive Applications

It is for these reasons that modern vehicles rely heavily on these advanced materials. The safety cage surrounding passengers, for instance, utilises ultra-high-strength steel that can absorb and redirect impact forces during collisions, creating a protective cocoon that has contributed to dramatic reductions in road fatalities.

Body-in-white structures, the welded sheet metal assemblage that forms a vehicle’s structural skeleton, use tailored steel blanks, where different steel grades are laser-welded together before stamping, positioning high-strength material precisely where needed.

In addition to structural applications, steel is also used in critical roles throughout vehicle systems. Suspension components demand steel’s fatigue resistance to withstand millions of stress cycles over a vehicle’s lifetime. Engine blocks in many vehicles still utilise cast iron, a form of steel prized for its vibration-damping and wear resistance. Even the humble steel spring, whether in suspension systems or valve trains, exemplifies steel’s versatility; heat treatment processes can tune these components to exact specifications for performance and durability.

Railway and Mass Transit

The automotive steel industry has responded proactively to the electric vehicle revolution. Whilst EV batteries add considerable weight, steel suppliers have developed third-generation AHSS grades that enable manufacturers to offset this through lighter body structures without compromising safety.

Battery enclosures themselves often use steel for structural rigidity and protection, with specific grades offering enhanced crash performance to safeguard lithium-ion cells.

Maritime and Aviation

Manufacturing considerations also favour steel. Established stamping, welding, and joining technologies represent decades of industrial refinement, allowing cost-effective high-volume production. Steel’s magnetic properties enable efficient spot welding, the dominant joining method in automotive assembly. New adhesive bonding techniques expand design possibilities further.

The material’s formability allows complex shapes to be pressed from flat sheets, creating aerodynamic body panels and intricate structural components in a single operation.

The Future of Transportation Steel

Sustainability influences material selection, and here, steel has impeccable credentials. Steel is the world’s most recycled material, with automotive steel containing approximately 25% recycled content on average. At the end of their lives, vehicles contribute over 14 million tonnes of steel to recycling streams annually in Europe alone, with recovery rates exceeding 85%.

This recyclability, combined with green steel production methods using hydrogen instead of coal, makes steel more important than ever now that the automotive industry is pursuing carbon neutrality targets.

Indeed, steel will be essential in the era of electric vehicles. Ongoing metallurgical innovations promise even stronger, lighter grades, whilst the material’s fundamental advantages,  strength, safety, affordability, and sustainability, make it the sensible choice for manufacturers balancing performance, cost, and environmental responsibility.

Structural Steel Fabricators Near You

If you’re looking for high-quality, CE-marked steel fabrication that will help any domestic or commercial project in the construction industry maximise its potential, Baker Steel Trading can help. To learn more, contact a member of our team today.