The meteoric rise in global nickel prices is overdone and will not likely be sustained in the coming months, says Goldman Sachs. But right now, nickel's fundamentals remain tight as disruptions to current production and delays to much-needed new projects continue to plague the market, Goldman Sachs adds. Demand from the stainless steel sector is also firm. LME nickel trades last at $35,500/ton, up from $34,700/ton Monday.