Method for producing malleable iron pipe by using reclaiming waste

• Main Authors: CHEN XIUJUN, LIU TANG, LIU JINSHENG, AI CHENGUANG, REN FUYAN, CHEN FENGYU
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2017
• Subjects: ALLOYS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for producing a malleable iron pipe by using reclaiming waste. The method is characterized in that a medium frequency furnace smelting process is adopted, foundry pig iron with waste machine iron, and raw materials include, by weight, 45-55 parts of foundry returns, 10-30 parts of waste rolled steel, 20-35 parts of the machine iron, 0.6-1 part of a carburetant, 0.25-0.5 part of ferrosilicon and 0-10 parts of malleable cast iron chippings. According to the method, the raw material structure and the matching process are optimized, the matrix structure of a cast workblank piece is improved, the product performance is stabilized, the phenomenon of casting grey pieces is reduced, and the rejection rate of cast products is reduced. 种使用回收废料生产可锻铸铁管件的方法，所述方法采用中频电炉熔炼工艺，以废机铁替代铸造生铁，其原料的重量份配比为：回炉料，45～55份；废钢材，10～30份；机铁，20～35份；增碳剂，0.6～1份；硅铁，0.25～0.5份；玛钢屑，0～10份。本发明通过优化原料结构和配比工艺，改善了铸造毛坯件的基体组织，稳定了产品的性能，减少了铸造灰件现象，降低了铸造产品的废品率。