Abstract
Following on the investigation of optimum chemical compositions to improve creep rupture strengths of modified 2.5 Cr-1 Mo weld metals which revealed that the decrease of C and Mn contents in weld metals was effective in improving creep rupture strength, the effects of N and Ni on mechanical properties were investigated. This investigation showed that an increase of N lowered creep rupture strength of weld metal, hut Ni had not any clear effect on tensile properties of weld metal. According to these investigations, welding consumables were newly designed and tested; the mechanical properties of weld metals satisfied the requirements of V-modified 2.5 Cr-1 Mo steel.
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