Japan's second-largest steelmaker, NKK Corp agreed with two other Japanese firms to consider future integration of their steel plant operations in a bid to combat severe competition. The alliance with heavy electric machinery maker Sumitomo Heavy Industries Ltd. and heavy machinery maker Hitachi Zosen Corp. was prompted partly by the emergence of giant overseas rivals, the three companies said. As the first step of the alliance, the companies will set up a joint venture in March, capitalized at $1.74 million, for sales of a variety of heavy machines used in the steel-making process to the domestic and overseas markets. The new company, which plans to launch operations in April, will be owned 34 percent by NKK, 33 percent by Sumitomo Heavy and 33 percent by Hitachi Zosen.