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Determination and Analysis on Dynamic CCT (Continuous Cooling Transformation) Curve of Low Carbon High Niobium Steel for High Strength and Toughness Drill Pipe
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Hai-rui Bai, Xiao-ming Yuan, Li Huang, Xiong Yang
Science & Technology of Baotou Steel | 2024, 50(1) : 47 - 50
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Science & Technology of Baotou Steel | 2024, 50(1): 47-50
• Variety Quality and Experimental Study •
Determination and Analysis on Dynamic CCT (Continuous Cooling Transformation) Curve of Low Carbon High Niobium Steel for High Strength and Toughness Drill Pipe
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Hai-rui Bai, Xiao-ming Yuan, Li Huang, Xiong Yang
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  • Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
Published: 2024-02-25
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The dynamic CCT curve of low carbon high niobium steel is determined and drawn as well as the effects of cooling rate on microstructure are studied through static simulating rolling compression test of low carbon high niobium steel with MMS-200 thermomechanical simulator. The results showed that the microstructure was mainly composed of polygonal ferrite (PF), a little pearlite (P) and small quantity of acicular ferrite (AF) observed when cooling rate was 0.5 ℃/s; the microstructure was mainly composed of acicular ferrite (AF) and pearlite disappeared, but certain proportion of polygonal ferrite (PF) was still visible when cooling rate was 1.0 ℃/s; the transformation structure was completely granular bainite (GB) when cooling rate was increased to 2 ℃/s; the transformation structure was mainly composed of granular bainite (GB) and a small amount of ferrite bainite (FB) when cooling rate was increased to 5 ℃/s; the transformation structure was mainly composed of ferrite bainite (FB) and a small amount of martensite (M) when cooling rate was increased to 30 ℃/s.

drill pipe  /  low carbon high niobium steel  /  dynamic CCT curve  /  cooling rate  /  microstructure
Hai-rui Bai, Xiao-ming Yuan, Li Huang, Xiong Yang. Determination and Analysis on Dynamic CCT (Continuous Cooling Transformation) Curve of Low Carbon High Niobium Steel for High Strength and Toughness Drill Pipe[J]. Science & Technology of Baotou Steel, 2024 , 50 (1) : 47 -50 .
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  • Receive Date：2023-10-11
  • Online Date：2025-10-23
  • Published：2024-02-25
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  • Received：2023-10-11
Affiliations
    Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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