Inverted angles are also known as "L-shaped section steel" " unequal-leg and unequal-thickness angle steel". It is a new type of profiled bar produced to meet the needs of large-scale shipbuilding. Apart from being used in the construction of large ships, inverted angles can also be applied in ocean engineering structures and construction engineering structures with high requirements. Marine equal-leg and unequal-leg angle steel is mainly used for the fabrication of frame structures.