【Haichuan Chemical Technology Documentation】Why did most sword makers in ancient times temper swords at night?
Thread Content
【Haichuan Chemical Technology Documentation】Why did most sword makers in ancient times temper swords at night? Why did ancient swordsmiths choose to harden blades only at night? Is there something that we can’t see during the day? That’s indeed the case.
【Ten Years of Rapid Development in Chemical Processing Equipment】2842-2025 **The research on ‘Key Technologies for Surface Treatment of Storage Tanks in Pipeline Systems, as well as the Development and Industrial Application of Intelligent Maintenance Systems’ has been evaluated as being at an internationally leading level** https://bbs.hcbbs.com/thread-5705865-1-1.html (Source: Haichuan Chemical Industry Forum (HCBBS))
【Ten Years of Rapid Development in Chemical Processing Equipment】2842-2025 **The research on ‘Key Technologies for Surface Treatment of Storage Tanks in Pipeline Systems, as well as the Development and Industrial Application of Intelligent Maintenance Systems’ has been evaluated as being at an internationally leading level** https://bbs.hcbbs.com/thread-5705865-1-1.html (Source: Haichuan Chemical Industry Forum (HCBBS))
【HaiChuan Safety Discussion】Compilation of Hidden Dangers Around Us – with pictures and texts; everyone is welcome to join the discussion: https://bbs.hcbbs.com/thread-5705518-1-1.html (Source: HaiChuan Chemical Forum (HuaHaiChuanLiu hcbbs))
【Ten Years of Rapid Development in Chemical Equipment】The world’s largest seamless steel pipe production line, 2843-2025, was officially put into operation at Shandong Guangfu Group. https://bbs.hcbbs.com/thread-5705991-1-1.html (Source: Haichuan Chemical Forum (Hua Haichuan Liu hcbbs))
【Ten Years of Rapid Development in Chemical Engineering Equipment】2844-2025: China’s first project for generating electricity from the surplus pressure of high-pressure natural gas transmission pipelines – the Haimen Station natural gas surplus pressure power generation project – has been put into operation in Nantong, Jiangsu. https://bbs.hcbbs.com/thread-5706004-1-1.html (Source: Haichuan Chemical Industry Forum (HCBBS))
【Ten Years of Rapid Development in Chemical Engineering Equipment】The 2845-2025 2MW/600℃ ultra-high temperature heat pump energy storage demonstration project was successfully commissioned on its first attempt. https://bbs.hcbbs.com/thread-5706020-1-1.html (Source: Haichuan Chemical Engineering Forum (Hua Haichuan Liu hcbbs))
【Ten Years of Rapid Development in Chemical Engineering Equipment】The 2845-2025 2MW/600℃ ultra-high temperature heat pump energy storage demonstration project was successfully commissioned on its first attempt. https://bbs.hcbbs.com/thread-5706020-1-1.html (Source: Haichuan Chemical Engineering Forum (Hua Haichuan Liu hcbbs))
【HaiChuan Safety Discussion】Hidden Dangers Around Us – Basic Safety Requirements for Work at Heights https://bbs.hcbbs.com/thread-5706329-1-1.html (Source: HaiChuan Chemical Forum (HuaHaiChuanLiu hcbbs))
【Ten Years of Rapid Development in Chemical Equipment】2847-2025: The first domestically produced million-ton-scale methanol synthesis reactor passed the factory acceptance test. https://bbs.hcbbs.com/thread-5706030-1-1.html (Source: Haichuan Chemical Forum (Hua Haichuan Liu hcbbs))