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 10889874
APP PUB NO 20180363091A1
SERIAL NO

16062875

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Abstract

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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. Chemical composition is properly controlled for the steel plate and satisfies 1≤Ti/N≤6 and Mg/Ti>0.017, where effective S content in steel=S−1.3 Mg−0.8 Ca−0.34 REM−0.35 Zr, and effective S content in steel: 0.0003-0.003%; finely dispersed inclusions may be formed in the steel plate, and the amount of composite inclusion MgO+Ti2O3+MnS in the steel plate is controlled at a proportion greater than or equal to 5%. The tensile strength of a base material so acquired is ≥510 MPa, insofar as welding input energy is 200-400 kJ/cm, the average Charpy impact work of the steel plate at −40 ° C. is 100 J or more, 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 LTD201900 FUJIN ROAD BAOSHAN DISTRICT SHANGHAI 885 SHANGHAI CITY SHANGHAI CITY 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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