20MnTiB液压油缸缸体用无缝钢管的性能分析及改进  

Performance Analysis and Improvement of 20MnTiB Seamless Steel Tube for Hydraulic Cylinder Body

作　　者：夏文斌[1] 郑戈 周勇[1] 赵映辉[1] XIA Wenbin;ZHENG Ge;ZHOU Yong;ZHAO Yinghui(Hengyang Valin Steel Tube Co., Ltd., Hengyang 421001, China)

机构地区：[1]衡阳华菱钢管有限公司

出　　处：《钢管》2019年第4期21-24,共4页Steel Pipe

摘　　要：分析Φ426 mm×38 mm规格厚壁高强度缸体用20MnTiB调质无缝钢管的理化性能,研究20MnTiB钢种应用于壁厚30 mm以上厚壁高强度油缸用钢管或低温使用的可行性。试验结果表明:20MnTiB钢种淬透性深度为15 mm左右,内外表面都冷却的情况下不适合生产壁厚30 mm以上的钢管;20MnTiB钢种的韧-脆转变温度在13 ℃左右,不适应低温环境工作;建议厚壁高强度液压油缸用钢管用高淬透性或低韧-脆转变温度的钢种替换20MnTiB;替代钢种具有较高的强度和优异的低温韧性,综合性能优于20MnTiB,更适合生产壁厚超过30 mm或低温环境使用的高强度液压油缸用钢管。The mechanical performance of Φ426 mm×38 mm 20MnTiB quenched and tempered seamless steel tube for cylinder casing service are studied, in order to assess the feasibility of using 20MnTiB steel in tubes thicker than 30 mm or in low temperature environment. The testing results indicate that the quenching depth of 20MnTiB steel is about 15 mm and it is not suitable for producing steel tubes thicker than 30 mm when it is cooled on both the inner and outer surfaces. Furthermore, since the ductile-brittle transition temperature of 20MnTiB steel is around 13 ℃, it is not applicable in low temperature environment. In place of 20MnTiB steel, it is suggested to use a steel type with higher hardenability and lower ductile-brittle transition temperature for thick wall high strength hydraulic cylinder pipe. The replacement has higher strength and excellent low temperature toughness and its comprehensive properties are better than 20MnTiB steel, which makes it more suitable for producing high strength hydraulic cylinder pipe with WT more than 30 mm or to be used in low temperature environment.

关 键 词：无缝钢管 液压油缸 20MnTiB 淬透深度 韧-脆转变温度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]