Study on Influencing Factors of N Content in Cr12N High Nitrogen Steel

By varying temperature,pressure,bottom blowing time and bottom blowing flux during vacuum smelting Cr12N steel for the purpose of determinating factors influencing N content in a Cr12N high nitrogen steel.The results indicated that N content decreased from 0.37% to 0.34% when the tested temperature increased from 1 560℃ to 1 620℃,The N content in Cr12N high nitrogen steel increased from 0.31% to 0.39% with pressure raising from 1.1 MPa to 1.6 MPa.Due to higher pressure the relationship between N content and pressure was nonlinear,which did not comply with Sievert law.N content increased with bottom blowing time extending at 5~15 minutes and remained constant after blowing for more than 15 minutes.Increasing bottom blowing flux at 0.16~0.18 m³/h would increase N content,while bottom blowing flux exceeded 0.18 m³/h.further increasing blowing flux led to reduction in N content.