The Metal Miner Index for stainless steel, which is based on global prices, rose 4.3% from February to March, as prices for nickel continued to move higher. The research service said, however, that volumes for nickel are weaker than last month. And in the U.S., stainless surcharges for 304 and 316 coil rose 0.3% and 1.96% respectively, the first increases since July last…