L垫 iron can be divided into three types: cast iron wedge-shaped pad iron, steel wedge-shaped pad iron, and explosion-proof wedge-shaped pad iron. The cast iron wedge-shaped pad iron is made of HT250 material, while the steel wedge-shaped pad iron is forged from Q235 low-carbon steel or mechanically processed. The explosion-proof wedge-shaped pad iron is made of beryllium bronze.