Up to now, the heaviest bronze ware unearthed in China and the world is Simu Wuding, but the heaviest cultural relic unearthed is not Simu Wuding, weighing 832.84 kg, which is less than 1t, while Kaiyuan Tieniu unearthed four iron cows, four iron men, two iron mountains, a group of seven-star iron columns and three earth-rock rammed piles at one time. Among them, an iron cow weighs 45t~72t, which may be the heaviest cultural relic unearthed in China.

Kaiyuan Iron Bull, also known as Yellow River Iron Bull.