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Study on Microstructure and Properties of Pipeline Steel L415M Produced with CSP Production Line
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Jiandong Wang1, Yan Cao2, Zhengfeng Liu1, Wei Zhang1, Wenkai Zhang1, Yingli Kang1, Zhilong Zhao1, Hui Chang3
Rare Earth Steel | 2026, 52(3) : 45 - 51
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Rare Earth Steel | 2026, 52(3): 45-51
• Variety Quality and Experimental Study •
Study on Microstructure and Properties of Pipeline Steel L415M Produced with CSP Production Line
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Jiandong Wang1, Yan Cao2, Zhengfeng Liu1, Wei Zhang1, Wenkai Zhang1, Yingli Kang1, Zhilong Zhao1, Hui Chang3
Affiliations
  • 1.CSP Plant of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
  • 2.Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
  • 3.Cold Rolled Rare Earth Steel Plate Plant of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
Published: 2026-06-05
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In order to expand the product type mix of CSP production line and break the technical bottleneck of producing microalloyed pipeline steel with compact process of strip steel, the industrial trial production is carried out based on Q355B bridge mode with smelting of KR (kambara reactor)-BOF (basic oxygen furnace)-LF (ladle furnace)-CC (continuous casting) and low C-Mn-Nb-Ti microalloying system by taking the pipeline steel L415M as the object in this paper. The results showed that the performances of sample with the specification of 9.75 mm could meet the requirements as well as there was performance fluctuation at head and in the direction of 45° for sample with the specification of 7.75 mm. Due to the limit of equipment conditions, the grain is coarser, strength is lower and yield ratio is higher for the product. The stability of product with thin specification could be improved by optimizing the composition and process, which could provide the technical support for large scale production of pipeline steel with the CSP production line.

CSP  /  L415M  /  microstructure  /  mechanical properties
Jiandong Wang, Yan Cao, Zhengfeng Liu, Wei Zhang, Wenkai Zhang, Yingli Kang, Zhilong Zhao, Hui Chang. Study on Microstructure and Properties of Pipeline Steel L415M Produced with CSP Production Line[J]. Rare Earth Steel, 2026 , 52 (3) : 45 -51 .
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Year 2026 volume 52 Issue 3
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Article Info
  • Receive Date：2026-01-08
  • Online Date：2026-08-13
  • Published：2026-06-05
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History
  • Received：2026-01-08
Affiliations
    1.CSP Plant of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
    2.Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
    3.Cold Rolled Rare Earth Steel Plate Plant 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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