Hot rolled coil, also known as hot-rolled steel plate, is primarily made of various materials. These primarily include, but are not limited to, ordinary carbon structural steel, low-alloy steel, and alloy steel. Specifically, common grades such as Q235B, Q345B, SPHC, 510L, Q345A, and Q345E are widely used.

Ordinary carbon structural steel hot-rolled coils possess good machinability and weldability, making them suitable for general architectural structures and machinery manufacturing. Low-alloy steel hot-rolled coils, on the other hand, excel in strength, toughness, and corrosion resistance, making them ideal for engineering structures and mechanical components that demand higher material performance.

In summary, hot-rolled coils are made of diverse materials tailored to meet the specific needs of various industries.