Chinese Ironmaking Technology

Timeline

1. c. -800–-700Sanmenxia-Luoyang · HenanFrom the late Western Zhou to the early Spring and Autumn period, bloomery iron and early iron objects appeared in the Central Plains; artifacts such as jade-handled iron swords excavated from the Guo state tombs indicate that China had mastered the basic capability of artificial ironmaking, with iron still used alongside bronze.
2. c. -600–-500Chu state territory · HubeiIn the mid-to-late Spring and Autumn period, China pioneered pig iron smelting and cast iron technology, enabling mass production of iron objects and demonstrating cost and efficiency advantages in farm tool production; archaeological finds in the Chu state and elsewhere show that pig iron use had already reached considerable scale.
3. c. -500–-300Yan-Zhao region · HebeiAround the early Warring States period, steelmaking techniques such as carburizing bloomery iron and repeated heating and forging matured; techniques like 'hundred-refined steel' significantly improved the hardness and toughness of iron weapons, laying the technical foundation for iron to fully replace bronze weapons.