The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 2020
Filed:
Dec. 08, 2016
Baoshan Iron & Steel Co., Ltd., Shanghai, CN;
Jian Yang, Shanghai, CN;
Shan Gao, Shanghai, CN;
Zhigang Ma, Shanghai, CN;
Ruizhi Wang, Shanghai, CN;
Caiyi Zhang, Shanghai, CN;
Junkai Wang, Shanghai, CN;
Guodong Xu, Shanghai, CN;
Yunan Wang, Shanghai, CN;
Baoshan Iron & Steel Co., Ltd., Shanghai, CN;
Abstract
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+AlO+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.