The project carried out the design and optimization of high-strength (yield strength ≥ 785MPa for steel plates over 180mm thickness), large-size (690MPa grade steel plate with thickness of 180~256mm), easy-to-weld marine engineering steel alloy, and reveal its toughening mechanism; elucidate the control principle of low-temperature toughness of the core of extra-thick steel plates under high strength (785MPa grade steel up to KV 2 (-60℃) ≥80J ); developed clean steel smelting technology and homogenization manufacturing technology for extra-thick high-strength steel ingots, high-permeability rolling technology and high-efficiency heat treatment technology and related equipment, and produced extra-thick high-strength marine engineering steel plates with qualified performance. Carry out the research on the weldability of extra-thick and high-strength steel plates and the development of supporting welding consumables to realize the strong and tough matching of welded joints of extra-thick and high-strength steel plates. The main data content data types include metallographic microscope, scanning electron microscope, (high-resolution) transmission electron microscope, high-temperature laser confocal microscope and backscattered electron diffractometer and other microstructure fine analysis and characterization means to obtain a variety of formats of tissue microscopic morphology photos, data types include a variety of formats of photo data, software statistics from the relevant table data, a variety of testing machines The data types include photo data in various formats, related table data from software statistics, mechanical property data from various testing machines, etc. The total amount of data is about 200 items, which will be made public for 2 years.
