Between 10-20 kg. The load-bearing capacity of a large steamer grate depends on the material, size and structure of the steamer. Usually the load-bearing range of a 40cm grate is between 10-20kg. A steamer grate is a grate used for steaming steamed buns. A steamer is a commonly used cooking tool in daily life, including a pot body, a steamer grate and a pot lid.