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公开(公告)号：EP0588128B1
公开(公告)日：1998-01-21
申请号：EP93113749.1
申请日：1993-08-27
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2.发明公开Process of hot forging at ultrahigh temperature 失效Verfahren zum Warmschmieden bei Ultrahoch -Temperatur。
公开(公告)号：EP0588128A1
公开(公告)日：1994-03-23
申请号：EP93113749.1
申请日：1993-08-27
发明人： Toda, Masahiro, c/o NIPPON STEEL CORPORATION , Miki, Takeshi, c/o NIPPON STEEL CORPORATION , Kada, Osamu, c/o NIPPON STEEL CORPORATION
摘要： A process of hot forging a steel at an ultrahigh temperature, including the steps of: heating a steel containing 0.1 wt% or more and less than 1 wt% carbon, in a non-oxidizing gas atmosphere, at a heating rate of from 3 to 20 °C/sec, in a differential manner such that the steel shell having a thickness of from 0.5 mm to 1/5 of a maximum diameter of the steel is heated to a temperature within a range from a higher value selected from a temperature 45°C below a solidus line and a temperature of 1250°C to a temperature 20°C below a liquidus line while the steel core is heated to a temperature 20°C below the liquidus line or higher; blowing a cooling medium onto the surface of the heated steel to remove an oxide film from the steel furnace while cooling the steel shell having a thickness of from 1 mm to 1/5 of the maximum diameter of the steel, at a high cooling rate of 10 °C/sec or more to a hot forging temperature of 1200°C or lower; and hot forging the steel, after the blowing, either in a die at a working speed of 500 mm/sec or more or in a die preheated to a temperature of 200°C of higher at a working speed of 200 mm/sec or more.
摘要翻译： 一种在超高温下热锻钢的方法，包括以下步骤：在非氧化性气体气氛中，以含有0.1重量％以上且小于1重量％的碳的钢，以3〜 20℃/秒，使钢的最大直径的厚度为0.5〜1/5的钢壳加热到从温度45以上的较高值的范围内的温度 DEGC低于固相线，温度为1250℃至液相线以下20℃的温度，同时将钢芯加热至液相线以下20℃以上; 将冷却介质吹到被加热钢的表面上，从钢炉中除去氧化膜，同时冷却钢的最大直径的1mm至1/5的钢壳，以高的冷却速度 10℃/秒以上至热锻温度1200℃以下; 并且在以500mm / sec以上的加工速度在模具中或者在200mm / sec以上的加工速度下预热至200℃的模具中，对钢进行热锻， 。
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