Production method of toughness nodular cast iron

• Main Authors: SUN SHUQUAN, LUO WEIXIANG, SUN XIONG
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2018
• Subjects: ALLOYS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a production method of toughness nodular cast iron, which includes four steps of: mixing and smelting raw materials, performing metamorphic modification, performing modification and tempering, and performing tempering thermal treatment. In the invention, on one hand, by means of rare earth, the nodular cast iron which has uniform and continuous distribution and high hardness and is not reduced in ductility, is produced, wherein the structural strength and toughness of the nodular cast iron work piece are greatly improved; on the other hand, through metamorphic treatment, anti-fatigue performance and wear resistance of the nodular cast iron work piece are comprehensively improved; besides, by means of the casting method, defects, such as internal stress concentration, cracks and sand holes, in the nodular cast iron work piece are reduced effectively, thus improving the quality and structural strength of the nodular cast iron work piece. 本发明涉及种强韧性球墨铸铁的生产方法，包括原料混合熔炼，变质调制，改性调制及调制热处理等四个步骤。