Effects of Alloying Elements and Condensed Film of the Inner Wall of Vacuum Fusion Apparatus on the Carbon Monoxide and Nitrogen Extraction

Abstract

SynopsisThe aUlhors made some eX/Jerimenls wilh resjICcl 10 Ilze nitrogen and carbon monoxide exlractions by Ilze vacuum Jusion method Jar Ihe analysis of gases in steels. As Jor the nilrogen gas, the varialion oj results in the rim oj analysis and the in.fluence q! alloying elemCllts were irwesligated to com/Jare willz tlze results obtained by clzemical analysis. On tlze other hand. the lowering tendency q! ox)'gen values in the pure iron by lite addition oj Al or Mn , relal;ng wilh the e./Ject oj M o-Izood, was studied. T emjJeralure measuremenls at Ihe inner wall surface oj Ihe Jurnace tube and the analyses oj the condCllsed lIletaLLic film on tlze surface and oj Ihe residual melals in the graphite crucible were also /Jerfonned. (1 ) Ascertained Ihat some elements like C r, V , M o and A I, Mn are hamiflll Jor the extraction oj nitrogen and carbon monoxide, res/Jectively. (2) Studied the cause and mechanism of the insllJficient nilrogen exlraction where its values are lower tlzan tlzose in tlze chemical analysis.(3) D iscussed the carbon monoxide adsolption mechanism oj tlze filill oj Ih e inner 1wLL mainly com/Josed oj Fe, Mn and AI. TIzCll it was Jound that tlze Mo-hood was considerably e./Jective in /Jreventil1g such a /Jhel1omenon.