芯棒是无缝钢管厂连轧管机组生产的重要工具。芯棒工作条件特殊,要有良好的热强度、高韧性、耐磨性及光洁的表面和相当高的精度,其合金元素含量高达80％,且冶炼芯棒钢的难度较大。 宝钢改国外的用电炉冶炼为300t转炉冶炼芯棒。他们生产的芯棒平均使用寿命达3000次以上,最高纪录为5000次,超过了该厂使用的西德芯棒平 Mandrel is a seamless pipe mill pipe rolling unit production of important tools. Mandrel special working conditions, to have good heat strength, high toughness, wear resistance and smooth surface and a very high precision, the alloying elements content up to 80%, and smelting caster steel more difficult. Baosteel smelting foreign electric furnace smelting 300t converter smelting mandibular. They produce an average life of mandrel up to 3,000 times, the highest record of 5,000 times, more than the plant used in West Germany mandibular level