Canadian steel and aluminum exporters may be granted another extension to talks to secure an exemption from America’s section 232 duties. That may be necessary given the risk that NAFTA negotiations stretch beyond the June 1 final deadline for such an exemption, which itself was stretched from the prior May 1 final deadline. Exporters appear to be preparing for duties though, with a 10.9% surge in shipments to the U.S. from Canada in 1Q sequentially. That resulted in a new record since at least 2009 in March. Yet, there is a degree of mutually assured destruction if Canada retaliates wit...