精密铸造锅炉管件用耐热奥氏体钢的研究
Research on heat-resistant austenitic steel for precision casting boiler pipe fittings
杨冠锋1
作者信息
- 1. 河北省特种设备技术检查中心,河北石家庄 056011
- 折叠
摘要
为了优化耐热奥氏体钢在锅炉管件精密铸造中的工艺,选取典型焊接接头进行分析,预热温度≥5℃,电压13～14 V,焊层数3层,电流190～200 A,层间温度50～230℃.结果显示,600～1200 ℃温度环境下,AFA25-15为单相奥氏体基体,析出相为NiAl、σ相、M23C6、MC碳化物.通过适当冷变形处理之后,强度明显提升,AFA-50％与AFA-20％抗拉强度均有所降低,断后伸长率变动差异表现不明显.材料氧化腐蚀程度与温度呈正比关系,S31042材料抗氧化腐蚀能力最强,S31035与C-HRA-5材料抗氧化腐蚀能力基本相当.通过本文的研究与探讨,有利于改善锅炉管件用耐热奥氏体钢的综合性能,提升拉伸性能.
Abstract
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.
关键词
精密铸造/锅炉管件/耐热奥氏体钢/冷变形处理/抗拉强度Key words
Precision casting/Boiler pipe fittings/Heat-resistant austenitic steel/Cold deformation treat-ment/Tensile strength引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据