Abstract: A sampling device and method for evaluating ecological risk of soil in a high geological background area comprises an impact sampling mechanism, a soil layer stripping mechanism and an auxiliary support frame. The impact sampling mechanism comprises a sampling hopper with a downward opening. A connecting sliding rod is fixedly arranged on the top of the sampling hopper. An upper end of the connecting sliding rod is connected with an impact rod. The impact rod is internally provided with an impact hammer capable of reciprocating along an axis of the impact rod. The soil layer stripping mechanism comprises a stripping sliding cylinder in sliding fit with the connecting sliding rod, and a support disc. A plurality of stripping plates are connected to a lower side edge of the support disc in a sliding fit mode.

Abstract: A sampling device and method for evaluating ecological risk of soil in a high geological background area comprises an impact sampling mechanism, a soil layer stripping mechanism and an auxiliary support frame. The impact sampling mechanism comprises a sampling hopper with a downward opening. A connecting sliding rod is fixedly arranged on the top of the sampling hopper. An upper end of the connecting sliding rod is connected with an impact rod. The impact rod is internally provided with an impact hammer capable of reciprocating along an axis of the impact rod. The soil layer stripping mechanism comprises a stripping sliding cylinder in sliding fit with the connecting sliding rod, and a support disc. A plurality of stripping plates are connected to a lower side edge of the support disc in a sliding fit mode.

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. 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.

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+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.

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+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.

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. 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.