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Abstract: During daily testing in one plant,the impact toughness of multi furnace batches of
£±Cr£±£±Ni£²W£²MoVsteelbarswasfoundunqualified£®Tofindthereasonsfordisqualification,analysiswascarriedout
fromtheaspectsofchemicalcompositionandheattreatmentregime,andthecomparativetestsweredone£®The
resultsshowthat:thetemperingtemperatureofheattreatmentwasthemainfactoraffectingtheimpacttoughness
of£±Cr£±£±Ni£²W£²MoVsteel;theimpacttoughnessofthe£±Cr£±£±Ni£²W£²MoVsteelspecimenswasallqualifiedwhenthe
temperingtemperaturewas£µ£´£°£Ç£µ£¹£° ¡æ;theimpacttoughnessofsome£±Cr£±£±Ni£²W£²MoVsteelspecimenswasnot
qualifiedwhenthetemperingtemperaturewas£¶£¶£°£Ç£·£±£°¡æ£®Thequalifiedrateofthematerialcouldbeimprovedand
theproductionschedulecouldbeensuredbyselectingtemperingtemperatureas£µ£´£°£Ç£µ£¹£° ¡æ£®
Keywords:£±Cr£±£±Ni£²W£²MoVsteel;impacttoughness;temperingtemperature
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