The Mexican government has applied duties to exports of carbon steel pipes from four countries including South Korea, following a similar case against China in February. Mexico’s imports of those products declined overall, with a 15% drop in the three months to February 28, though shipments from Germany surged 36%. That illustrates a continuing problem in the commodity metals industries, where duties on supplies from one country just leads to supplies from elsewhere. That will be exacerbated by the U.S. section 232 duties on steel and aluminum. Suppliers seeking to avoid the latter may s...