Baoshan Iron & Steel Co., Ltd.

Ruizhi Wang

Jian Long Yang

Kai Zhu

Jianhua Zhu

Guodong Xu

Jianjun Zhi

Junkai Wang

Zhengjie Fan

Yunan Wang

Shan Gao

Zhigang Ma

Caiyi Zhang

Jianguo Shen

Yiyu Zheng

Jian Yang

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&#x2264;Ti/N&#x2264;6 and Mg/Ti&#x3e;0.017, where effective S content in steel=S&#x2212;1.3 Mg&#x2212;0.8 Ca&#x2212;0.34 REM&#x2212;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+TiO+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 &#x2265;510 MPa, insofar as welding input energy is 200-400 kJ/cm, the average Charpy impact work of the steel plate at &#x2212;40 &#xb0; C. is 100 J or more, at the same time, the average Charpy aging impact work of the base material of &#xbd; thickness at &#x2212;40&#xb0; C. is 46 J or more.

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

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&#x2264;Ti/N&#x2264;6 and (Ca+REM+Zr)/Al&#x2265;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 &#x2265;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 &#x2265;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 &#x2212;40&#xb0; C. is 100 J or more, and at the same time, the average Charpy aging impact work of the base material of &#xbd; thickness at &#x2212;40&#xb0; C. is 46 J or more.

A device for continuously measuring the flow rate of steel melt near surface thereof, comprising a flow rate detecting rod () and a deflection means (B) for the flow rate detecting rod, wherein the flow rate detecting rod () comprises a refractory material tube at one end and a stainless steel rod at the other end, and the stainless steel rod is fittedly connected with the refractory material tube. Also provided is a method for continuously measuring the flow rate of steel melt near surface thereof.

Device and method for continuously measuring flow rate near liquid steel surface

A device for measuring the flow rate of steel melt near the surface thereof. The device has a flow rate detecting rod and a deflection device for the flow rate detecting rod. The deflection device for the flow rate detecting rod has a flow rate detecting rod counterweight, a deflection bearing sleeve, a deflection bearing, a deflection angle indicating board, a deflection angle pointer and a flow rate detecting rod fastening bolt.

Device for measuring flow rate of steel melt near a surface of the steel melt

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Shanghai, China

Ruizhi Wang