Research on heat-resistant austenitic steel for precision casting boiler pipe fittings
In order to optimize the process of heat-resistant austenitic steel in the precision casting of boiler pipe fittings,typical welded joints were selected for analysis,the preheating temperature was ≥5℃,the voltage was 13～14 V,the number of welding layers was 3 layers,the current was 190～200 A,and the interlayer temperature was 50～230 ℃.The results showed that AFA25-15 was a single-phase austenite matrix and the precipitated phases were NiAl,σ phase,M23C6 and MC carbides at 600～1200℃.After the appropriate cold deformation treatment,the strength was significantly improved,the tensile strength of AFA-50％and AFA-20％decreased,and the difference in elongation after fracture was not obvious.The degree of oxidation corrosion of the material is proportional to the temperature,S31042 material has the strongest oxidation and corrosion resistance,and S31035 and C-HRA-5 materials have the same oxidation and corrosion resistance.Through the research and discussion in this paper,it is beneficial to improve the comprehensive properties of heat-resistant austenitic steel for boiler pipe fittings and improve the tensile properties.
NETL
NSTL
万方数据
维普
