近十多年来,世界上轧钢技术和生产能力有很大发展,产钢最多的美、日、苏三国,钢材热轧机的能力都已达到1.5亿吨/年左右的水平。型钢是钢材的三大品种-型钢、钢板、钢管-之一。型 In recent ten years, the world’s steel rolling technology and production capacity have great development, the largest steel production in the United States, Japan and the Soviet Union, the ability of hot-rolled steel has reached 150 million tons / year level. Steel is the three major varieties of steel - steel, steel, steel - one. type