Development of 800 MPa Low Welding Crack Sensitivity High Strength Steel Plate SX780CF for Hydropower Station

罗应明; 王九清; 庞辉勇; 张朋; 蒙耀华; 赵燕青

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Development of 800 MPa Low Welding Crack Sensitivity High Strength Steel Plate SX780CF for Hydropower Station

更新时间：2026-01-21

- Development of 800 MPa Low Welding Crack Sensitivity High Strength Steel Plate SX780CF for Hydropower Station
- Special Steel Vol. 43, Issue 3, Pages: 21-24(2022)
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- Received：12 October 2021，
  
  Online First：16 June 2022，
  
  Published：16 June 2022
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罗应明, 王九清, 庞辉勇, et al. Development of 800 MPa Low Welding Crack Sensitivity High Strength Steel Plate SX780CF for Hydropower Station[J]. Special Steel, 2022, 43(3): 21-24.
DOI：

罗应明, 王九清, 庞辉勇, et al. Development of 800 MPa Low Welding Crack Sensitivity High Strength Steel Plate SX780CF for Hydropower Station[J]. Special Steel, 2022, 43(3): 21-24. DOI：

摘要

通过设计成分(/%：0. 09C

0. 15Si

l. 15Mn

0. 58Ni

0. 47Cr

0. 44Mo

0. 033V

0. 022Nb

0. 0012B

0.036Al

0.014Ti)

控制熔炼分析N含量≤20x10

-6

冶炼，钢锭最高加热温度≤ 1 200℃ 轧制、930℃淬火、610℃回火，开发出的60 mm厚SX780CF钢板屈服强度780 MPa

抗拉强度887 MPa

延伸率18%

5%应变250 °C时效后 -20 ℃冲击功(KV

) 203 - 210 J

满足水电站用800 MPa级低焊接裂纹敏感性高强钢技术要求。

Abstract

Through the design composition (/% : 0. 09C

0. 15Si

1. 15Mn

0. 58Ni

0. 47Cr

0. 44Mo

0. 033V

0.022Nb

0.0012B

0.036Al

0.014Ti)

the N content of smelting analysis controlled to be ≤ 20 x 10

-6

in steel smelting

rolling with ingot maximum heating temperature ≤1 200 °C

and quenching at 930 °C and tempering at 610 °C

the developed 60 mm SX780CF steel plate has yield strength 780 MPa

tensile strength 887 MPa

elongation 18% and 5% strain 250 °C aged -20 °C impact energy (KV

) 203 ~ 210 J

which meet the technical requirements of 800 MPa low welding crack sensitivity high strength steel for hydropower station.

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