摘要
介绍了合金球墨铸铁轧辊的技术要求及铸件结构，详细阐述了铸件的试制方法：选用60％重RE球化剂＋40％轻RE球化剂，冲入法进行球化处理，球化剂加入量1．40％；采用高Ba—Ca孕育剂进行包内孕育，加入量为O．7％，在铁液浇注时加入0．1％、粒度为0．3～1mm的S-O孕育剂，进行随流孕育；采用部分奥氏体化正火＋回火热处理工艺，奥氏体化温度为880～900℃，回火温度为580～600℃。生产结果显示：铸件的抗拉强度平均为667MPa，屈服强度平均为411MPa，伸长率为14％，布氏硬度平均为320HB，且铸件的内外硬度基本一致。
The technical requirements and cast structure of nodular iron alloy roller were introduced. The trial production method of casting was described in detail：nodularizing agent was 60% heavy RE＋40% light RE. It was thrust into iron melt by 1.4% volume. High Ba-Ca inoculant was add by 0.7% in ladle. In metal-stream inoculation,S-O inoculant in the particle size of 0.3-1 mm was added into the melt. Partial austenitizing normalizing＋tempering heat treatment process were taken. The austenitizing temperature was 880-900 ℃ and tempering temperature was 580-600 ℃.The results showed that the average tensile strength of the castings was 667 MPa,the average yield strength was 411 MPa,the elongation was 14% and the Brinell hardness was 320 HB. The hardness inside and outside the castings were basically the same.
出处
《现代铸铁》
CAS
2016年第6期31-34,共4页
Modern Cast Iron
关键词
球墨铸铁
轧辊
热处理
力学性能
硬度
nodular iron
roll
heat treatment
mechanical properties
hardness
