Thick steel plate for high heat input welding and having great heat-affected area toughness and manufacturing method therefor

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United States of America Patent

PATENT NO 10837089
APP PUB NO 20180371587A1
SERIAL NO

16062880

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A thick steel plate for high heat input welding and having great heat-affected area toughness and a manufacturing method therefor, comprising the steps of smelting, casting, rolling, and cooling. Also, the chemical composition of the steel plate satisfies 1≤Ti/N≤6 and (Ca+REM+Zr)/Al≥0.11, where the effective S content in steel=S-0.8Ca-0.34REM-0.35Zr. and the effective S content in steel: 0.0006-0.005%; finely dispersed inclusions may be formed, and the amount of composite inclusion CaO+Al2O3+MnS+TiN in the steel plate is at a proportion of ≥12%. With respect to welding in which the thickness of the steel plate is 50-70 mm, the tensile strength of a base material is ≥510 MPa. and welding input energy is 200-400 kJ/cm, the average Charpy impact work of a welding heat-affected area of the steel plate at −40° C. is 100 J or more, and at the same time, the average Charpy aging impact work of the base material of ½ thickness at −40° C. is 46 J or more.

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Patent Owner(s)

Patent OwnerAddress
BAOSHAN IRON & STEEL CO LTDSHANGHAI 201900

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gao, Shan Shanghai, CN 179 875
Ma, Zhigang Shanghai, CN 39 487
Wang, Junkai Shanghai, CN 6 9
Wang, Ruizhi Shanghai, CN 10 4
Wang, Yunan Shanghai, CN 12 4
Xu, Guodong Shanghai, CN 25 49
Yang, Jian Shanghai, CN 606 6431
Zhang, Caiyi Shanghai, CN 2 1

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