31343510ironPT2026-03-30 20:32:38UF31343511FeNDUF31343512ferrous metalNDBT31375248iron and iron alloyPTBT31319740elementsPTNT31373778structural ironPTNT31373776pig ironPTRT31321630ironworkPTRT31338665iron workersPTRT31340957ironworkingPTRT31343391iron oxidePTRT31344637cementitePTRT31344664maghemitePTRT31371829blacksmithingPT