Heat treatment method for Cr-Mo wear-resistant cast iron

• Main Author: ZHOU BINGZHEN
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2017
• 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 discloses a heat treatment method for Cr-Mo wear-resistant cast iron. The Cr-Mo wear-resistant cast iron is prepared from components in percentage by weight as follows: 2.8%-3.8% of C, 1.65%-2.7% of Si, 0.5%-1.2% of Mn, 0.12%-0.7% of P, 0.2%-0.5% of Cr, 0.3%-0.8% of Mo, less than or equal to 0.09% of S and the balance of Fe. The method comprises steps of mixing, preheating, smelting, quick on-the-spot sample analysis, final deoxidation, inoculation treatment, pouring and high temperature annealing. The method is simple, through strict control on addition amounts of Cr and Mo, the structure can be refined remarkably, the comprehensive performance such as the mechanical strength, the wear resistance, the heat resistance and the like can be improved, the mechanical performance of the cast iron can reach the HT250 mark, meanwhile, the mechanical performance and the machinability are improved, and the cast iron is particularly suitable for casting of air cylinders, piston rings and tappets. 本发明公开了种铬钼