The bell , valve and fire duct are important equipments to guarantee the production of blast furnace in the first iron mill of Jinan Iron and Steel Group Co.

• 济钢第一炼铁厂高炉料钟、放散阀、火管是维系高炉生产的重要设备,其寿命成为制约高炉技术经济指标提高的瓶颈。