摘要
采用离心浇铸制备外层为碳钢Q235,内层为高铬铸铁的双金属复合管。在不同温度(950、980℃)及不同冷却方式(空冷、水冷、风冷)下对复合管进行热处理试验。结果表明,试验温度下,空冷、水冷、风冷方式都可消除Q235钢铸态组织中的魏氏组织;水冷可提高复合管的硬度,但复合管出现严重畸变甚至开裂。合理的热处理工艺为950℃×1 h,空冷+450℃×3.5 h回火+350℃×3.5 h回火,可使复合管达到较高的硬度(60～63 HRC),满足标准DL/T 680—1999《耐磨管道技术条件》的要求。
Bimetallic clad pipes made of carbon steel Q235/high chromium cast iron were prepared by centrifugal casting. Heat treatment tests at different temperatures （950 ℃ and 980℃ ） and in different cooling ways （ air cooling, water cooling and furnace cooling） were carried out on the clad pipes. The results show that at the test temperatures, Widmannstatten microstrncture of the as-cast Q235 steel can be eliminated in all the different cooling ways; the hardness of the clad pipes can be enhanced by water cooling, however the distortion is serious, even results in cracking. The results conclude that the proper heat treatment process is austenizing at 950℃for 1 h, air cooled ＋ tempering at 450 ℃ for 3.5 h ＋ tempering at 350℃for 3.5 h, and treated in this process, the clad pipes can obtain high hardness （60- 63 HRC） and meet the standard requirements of DIMT 680--1999 ＂Specification for wear-resistant pipes＂.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第7期22-25,共4页
Heat Treatment of Metals
关键词
离心铸造
高铬铸铁
复合管
热处理
centrifugal casting
high chromium cast iron
clad pipe
heat treatment
