Grain steel silos We offer complete grain storage system with services of design, budget, manufacture, erect and maintain. YIKAI steel silos are made by high quality galvanized steel plates and bolts. There are three kinds of steel silos. 1. Flat Bottom Steel Silo with Concrete Flat Foundation (1,000t - 10,000t) 2. Flat Bottom Steel Silo with Concrete Corn Bottom (800t - 5,000t) 3. Hopper Bottom Steel Silo with Steel Structure Base (10t - 1,200t)