After analyzing information presented by domestic steel producers and its International Trade Practices Unit, the secretariat said it found "sufficient cause to open an investigation."
It says the action is part of its efforts to promote fair international trade practices.
The National Iron and Steel Industry Chamber, or Canacero, has been denouncing the domestic impact of increased steel imports from China for several months, a situation exacerbated by the recent devaluation of the yuan.
Mexico's imports of laminated steel from China had grown sharply even prior to the yuan's devaluation, rising 112.5 percent in the first half of 2015 compared with the same period of last year.
Mexico's steel trade deficit also climbed to 4.65 million tons, up 55.8 percent from January-June 2014. EFE
