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    Research on International Competitiveness of China-made Seamless Steel Tube Products in GCC Market
    WANG Liang
    2020, 49(4): 1-8.
    Abstract PDF
    Development of Full-length Normalization Process for Large-sized SAWL Pipe
    XIE Shiqiang, SUN Leilei, WANG Bo
    2020, 49(4): 9-13.
    Abstract PDF
    Study and Application of Online Retained Mandrel Speed Model
    LI Miao, MU Dong, OUYANG Jian
    2020, 49(4): 14-17.
    Abstract PDF
    Study on Hot-extrusion Pressure for Incoloy 825 Alloy Tube
    LI Zhijun, ZENG Fanbo, OU Yuefei, TANG Yunfei
    2020, 49(4): 18-21.
    Abstract PDF
    Process and Equipment for Φ100 mm 3-roll Mandrel Pipe Mill
    WANG Zenghai, LIN Zhen, GAO Feng, GAO Heping, LI Libin, BAI Zhifeng, ZHANG Ruilin, KAO Ran
    2020, 49(4): 22-27.
    Abstract PDF
    Effects by C and Mn Contents on HIC Resistance of X65MS Linepipe Steel
    ZHAI Dongyu
    2020, 49(4): 28-31.
    Abstract PDF
    Discussion on Internal Punching Process for Friction-welded Oil Drill Pipe
    NIU Chengjie, ZHANG Meimei, DAI Shutan, KONG Lingnan
    2020, 49(4): 32-35.
    Abstract PDF
    Discussion on Causes for Unstable Elongation Rate of N80Q Oil Tubing
    ZHANG Youpeng, WU Yuxin, LI Dahang, LIU Xuan, ZHOU Hongqing, ZHU Yixuan, ZHAO Gang
    2020, 49(4): 36-38.
    Abstract PDF
    Causes for Weld Seam Performance Nonconformance and Spot Defect of SAWL Pipe
    WANG Yan
    2020, 49(4): 39-42.
    Abstract PDF
    Effect by Nonmetallic Inclusions on Ultrasonic Detection of TP316L Seamless Steel Tube
    ZHANG Yabin, PANG Yusi, WANG Lianhua, GUO Ling, LIU Jing, CHEN Shulei
    2020, 49(4): 43-46.
    Abstract PDF
    Discussion on Common Problems as Staying with Push-type Tube Hot-expanding Process with Local Medium-frequency Induction Heating
    WANG Jianwen, XIAO Changming
    2020, 49(4): 47-49.
    Abstract PDF
    Analysis of Reasons for Nonconformance of Heat Treatment Performance of AISI 1340 Heavy Wall Drill Collar Pipe Body
    SONG Guangxin, HE Tieshan, GUO Sheng, ZUO Guofeng, ZHAO Yinghui, ZHOU Yong
    2020, 49(4): 50-55.
    Abstract PDF
    Analysis of Reasons for Quench-caused Crack of Seamless Steel Tube and Relevant Preventive Actions
    HUANG Beibei, HOU Qiang, HU Li
    2020, 49(4): 56-59.
    Abstract PDF
    Theoretic Study on Influence by Machining Ovality of Premium Connections
    ZHAN Xianjue, ZHANG Zhonghua, MA Jilong
    2020, 49(4): 60-63.
    Abstract PDF
    Experimental Research on Sealing Ability of Oil Tubing/Casing Premium Connection
    TANG Jiarui, CHAO Lining, XU Kai, ZHOU Xinyi, WANG Qiang, YANG Xiaolong
    2020, 49(4): 64-69.
    Abstract PDF
    Analysis and Handling of Fault F030 of Siemens 6RA70 DC Speed Control Device
    WANG Renbo, WANG Chao
    2020, 49(4): 70-75.
    Abstract PDF
    Application and Research of Motor Speed-torque Electric Synchronization System
    DAI Yaohui
    2020, 49(4): 76-79.
    Abstract PDF
    Process technology for steel tube sizing（reducing）（Ⅲ） —Practical Technology for Hot-rolled Seamless Steel Tube
    CHENG Haitao, LI Chibo, LI Xiao
    2020, 49(4): 80-83.
    Abstract PDF