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Application Performance of Microalloyed 2 000 MPa Grade Thermoformed Steels
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Guangxiang Cao1, 2, Longqing Zhao1, 2, Qi Jing1, Guangming Xia1, 2, Meng Ju1, 2, Fengning Liu1, 2
Automobile Technology & Material | 2025, (4) : 46 - 52
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Automobile Technology & Material | 2025, (4): 46-52
• Original article •
Application Performance of Microalloyed 2 000 MPa Grade Thermoformed Steels
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Guangxiang Cao1, 2, Longqing Zhao1, 2, Qi Jing1, Guangming Xia1, 2, Meng Ju1, 2, Fengning Liu1, 2
Affiliations
  • 1 Global R&D Center, China FAW Corporation Limited, Changchun 130013
  • 2 National Key Laboratory of Advanced Vehicle Integration and Control, Changchun 130013
Published: 2025-04-20 doi: 10.19710/J.cnki.1003-8817.20240259
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This study investigates the tensile properties, bending properties, hydrogen embrittlement sensitivity, spot welding performance, and coating corrosion resistance of Al-Si coated thermoformed steel based on vanadium and niobium composite microalloy under typical hot forming processes. The results indicate that under heating temperature of 930 ℃, heating time of 300 s and holding time of 10 s, the experimental material achieves a tensile strength of 2 000 MPa and extreme tip cold bending angle is greater than 50°, demonstrating a favorable combination of strength and toughness. The mechanical properties exhibit significant anisotropy, with a notable improvement in toughness after baking at 170 ℃ for 20 minutes. The strength and ductility parameters display varying strain rate sensitivities across different strain rates ranging from 0.1 ~ 500 s-1. In a four-point bending test at 100% yield strength in an air environment, the hot-formed material show no cracks or fractures after 300 h, indicating excellent resistance to hydrogen embrittlement. Additionally, the spot welding performance and coating corrosion resistance of the experimental material meet application requirements.

Microalloying  /  Thermoformed steel  /  Bending property  /  Hydrogen induced delayed cracking  /  Spot welding joint performance
Guangxiang Cao, Longqing Zhao, Qi Jing, Guangming Xia, Meng Ju, Fengning Liu. Application Performance of Microalloyed 2 000 MPa Grade Thermoformed Steels[J]. Automobile Technology & Material, 2025 , (4) : 46 -52 . DOI: 10.19710/J.cnki.1003-8817.20240259
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doi: 10.19710/J.cnki.1003-8817.20240259
  • Online Date：2025-11-13
  • Published：2025-04-20
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    1 Global R&D Center, China FAW Corporation Limited, Changchun 130013
    2 National Key Laboratory of Advanced Vehicle Integration and Control, Changchun 130013
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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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