摘要
介绍了碳钢/镍基合金双金属复合管的生产工艺及其金相组织和化学成分,对离心浇注、热挤压、热处理等过程出现的缺陷进行分析。结果表明,转速控制在950~1 050r/min之间,管坯厚度不均匀性大为降低,而裂纹缺陷基本消除;热挤压时,在加热温度为1 180℃,模具预热温度为460℃、挤压力为35 MN、挤压速度为65 mm/s、挤压比为6.4、采用进口专用玻璃粉润滑剂,可避免复合管内表面凹坑和裂纹;在910℃×90min处理后油冷,然后在650℃×150min空冷后所得复合管力学性能满足技术要求。
Production process,microstructure and chemical composition of the double metal composite pipe were introduced,and defects in the double-metal composite pipe were analyzed during centrifugal casting,hot extrusion,heat treatment process.The results reveal that by controlling rotary velocity in950~1 050 r/min,thick-heterogeneity of pipe-blank is decreased greatly,and crack is basically eliminated.Concave and crack in inner surface of composite pipe can be eliminated with heating at 1 180℃and preheating mold at 460 ℃ as well as squeezing force of 35 MN,squeezing velocity of 65 mm/s,squeezing ratio of 6.4 and the imported special glass powder lubricant.With quenching at 910 ℃ for 90 min and oil cooling+tempering at 650℃for 150 min and air cooling,mechanical properties of the composite pipe can meet technological requirement.
作者
王冬林
吴金辉
蔡彬
李富强
王志鹏
李安强
王文嘉
Wang Donglin,Wu Jinhui,Cai Bin,Li Fuqiang,Wang Zhipeng,Li Anqiang,Wang Wenjia(Key Laboratory of Petroleum Tubular Engineering, CNPC Tubular Goods Research Institut)
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第3期288-290,共3页
Special Casting & Nonferrous Alloys
关键词
双金属复合管
缺陷
控制
离心浇注
热挤压
Double Metal Composite Pipe, Defects, Control, Centrifugal Casting, Hot Extrusion