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室兰钢厂1420毫米热连轧板机于1957年投入生产。该轧机轧线长度为250米,用于生产单位卷重为7公斤/毫米的板卷,月产量6万吨。该轧机自投产以来,22年内共生产了近3000万吨产品。六十至七十年代大型高炉、转炉和板坯连铸机的问世,促进了大型热连轧板机的发展。出现了一批轧制速度高(20米/秒以上)、单位卷重大(21.5公斤/毫米以上)、电子计算机控制的大型热连轧板机。与现代化热连轧板机相比,室兰厂的轧机显得落后了。为了市场竞争,1965年开始实行在250米轧线上以少量投资生产大型优质板卷的技术改造规划。
Muroran 1420 mill hot rolling mill in 1957 put into production. The rolling mill has a length of 250 meters and is used for the production of coils with a unit weight of 7 kg / mm and a monthly output of 60,000 tons. The mill has produced nearly 30 million tons of products in 22 years since it was put into production. The advent of large blast furnaces, converters and slab caster in the 60s and 70s promoted the development of large hot strip mill. A number of large-scale hot-rolling mill machines with high rolling speed (20m / s or more) and heavy unit volume (21.5kg / mm) and computerized control have appeared. Compared with the modern hot-rolling mill, Muroran mill is outdated. In order to compete in the market, the technical transformation plan for large-scale high-quality coil production with a small amount of investment on a 250-meter rolling line began in 1965.