Ming Cast-Iron Technology

Timeline

1. 1368–1400Zunhua, Hebei · HebeiThe Hongwu emperor established official smelting and casting institutions such as the Baoyuan Bureau of the Ministry of Works, rebuilding blast-furnace iron smelting at Zunhua, Shanxi, and elsewhere, casting farm tools, weapons, and coins in pig iron, restoring ironmaking capacity devastated by the late Yuan wars.
2. 1403–1435Beijing · North ChinaAfter the Yongle emperor moved the capital to Beijing, iron and bronze cannons were cast on a large scale, improving clay-mold casting techniques and barrel design; Zheng He's fleets were also equipped with cast-iron anchors and iron implements, advancing the maturity of Ming military cast-iron technology.
3. 1461–1470Zhangzhou, Fujian · FujianDuring the Chenghua era, private iron smelting expanded in Fujian, Guangdong, and elsewhere; production areas like the Longyan iron mine used blast furnaces for continuous iron output, casting plowshares, hoes, and sickles for southern rice-growing regions, as cast-iron technology spread widely from official military production into civilian manufacture.
4. 1470–1644China · ChinaThe Tiangong Kaiwu of the mid-to-late Ming systematically recorded crucible steelmaking, stir-fried steel (chaogang), and cast-iron techniques; national iron output is estimated to have ranked among the world's highest, with large numbers of cast-iron cannons deployed along the Great Wall and northern frontier defenses, until the peasant wars and Manchu conquest restructured ironmaking in the late Ming.