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我国古代炼制刀剑的技术,历史悠久。最初期的炼钢术是人们在锻打熟铁的过程中,由于反复在木炭中加热,使铁吸收了碳,提高了含碳量(含碳量在0.25％以下的为熟铁,在O.25％至1.7％的为钢),减少了夹杂物,因而变得坚硬,渗碳成钢,而得到了钢。用这种方法得到的钢称为块铁渗碳钢。文字记载和出土文物表明,我国至晚在战国中晚期已经掌握了这种炼钢技术,并且被用来制造兵器和手工工具。当时楚国的宛出钢铁,所制的矛等兵器很锋利,“惨如蠭虿”,意思是说比蜂蝎的尾剌还要尖利。秦昭王曾夸奖楚国剑的锋利。韩国
Ancient Chinese sword refining technology, has a long history. The initial steelmaking process is that during the process of forging the wrought iron, the iron is absorbed by the iron due to repeated heating in the charcoal, and the carbon content is increased (the wrought iron with the carbon content below 0.25% is O .25% to 1.7% for steel), reduced inclusions, and thus hardened, carburized into steel, resulting in steel. The steel obtained in this way is called a bulk iron carburized steel. The written records and the unearthed relics show that our steelmaking technology has been mastered late to late in the Warring States Period and used to make weapons and hand tools. At that time Chu of the Wan Shui Steel, the spear and other weapons made sharp, “miserable,” means that the sting than the bee Scorpio even sharp. Qinzhao Wang had praised Chu sharp sword. Korea