The Iron Pillar of Delhi, standing 23 feet, weighing 6 tonnes and containing 99.72% iron without any signs of rust, is a remarkable example of metallurgical science in 5th century AD. Cited in 1. Metal Casting - Overview . （页面存档备份，存于互联网档案馆）
The Iron Pillar of Delhi, standing 23 feet, weighing 6 tonnes and containing 99.72% iron without any signs of rust, is a remarkable example of metallurgical science in 5th century AD. Cited in 1. Metal Casting - Overview . （页面存档备份，存于互联网档案馆）
