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俗话说，世间有三苦。撑船、打铁、卖豆腐。锻造是一个拥有四千多年历史的古老技艺，以往锻造都依赖于人工，是个重体力活。但是如今我们利用万吨压机，锻造百吨级的钢锭就像揉面团一样轻松。金属构筑成形技术帮助我们解决了世界性的难题，做成了世界上最大的金属呼啦圈，助力我们国家核能重大装备的建设实施。什么是国之重器？金属锻造有哪些好处？偏析有什么危害？我们是如何造出世界上最大的金属呼啦圈？“格致论道”是中国科学院全力推出、中国科普博览承办的科学讲坛，致力于精英思想的跨界传播。登录官方网站（self.org.cn）、微信公众号“SELFtalks”获取更多信息。
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