低温易焊接高强韧耐候用特厚钢Q355GNHE钢板研发实践
Research and Development Practice of Q355GNHE Steel Plate with Low Temperature, Weldability, High Strength, Toughness and Weather Resistance

本文论述了60 mm~95 mm低温易焊接高强韧耐候用钢Q355GNHE生产过程，采用铁水KR预处理、120 t转炉冶炼、VD脱碳处理、LF精炼、VD真空处理、400 mm宽厚板坯连铸机浇注、3800 mm四辊轧机TMCP (热机械轧制)、ACC层流冷却、钢板高温缓冷等生产工艺及合理的成分设计，实现了以TMCP状态的60 mm~95 mm低温易焊接高强韧耐候用钢Q355GNHE钢板研发成功，可达到批量化生产。
This paper describes the production process of Q355GNHE steel with low temperature, weldability, high strength, toughness and weathering resistance from 60 mm to 95 mm. KR pretreatment, 120 t converter smelting, VD decarbonization, LF refining, VD vacuum treatment, 400 mm wide slab caster casting, 3800 mm four-high rolling mill TMCP (hot mechanical rolling), ACC laminar flow cooling and high temperature of steel plate are used. The low temperature, weldable, high strength, toughness and weathering steel Q355GNHE in TMCP state has been successfully developed and batch production can be achieved.