Thick steel plate with excellent toughness in welding heat-affected zone and manufacturing method thereof
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A welding heat-affected zone and manufacturing method technology, applied to the thick steel plate with excellent toughness in the welded heat-affected zone and its manufacturing field, can solve the problems of small amount of titanium oxide, insufficient improvement of the toughness of the welded heat-affected zone, and difficult dispersion distribution
Active Publication Date: 2016-06-22
BAOSHAN IRON & STEEL CO LTD
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However, titanium oxide has two major problems: the small amount and the difficulty of dispersing in steel.
If it is desired to increase the amount of titanium oxide by increasing the titanium content in the steel, it will inevitably lead to the formation of large titanium oxide inclusions
When the size of titanium oxide particles is greater than 5 μm, it will reduce the impact toughness of the base metal and welding heat-affected zone
Therefore, in the process of large input energy welding with welding input energy greater than 200kJ / cm, titanium oxide alone is still not enough to improve the toughness of the welding heat-affected zone
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[0063] The present invention will be further described below in conjunction with embodiment.
[0064] Table 1 is the chemical composition (mass%) and Ti / N ratio of the examples and comparative examples of the present invention. Table 2 shows the mechanical properties, inclusion properties and impact toughness of the welded heat-affected zone of the examples and comparative examples of the present invention. After smelting, refining and continuous casting, the chemical composition of the slab is shown in Table 1. Then the billet is heated to 1050°C-1250°C, the initial rolling temperature is 1000-1150°C, and the cumulative reduction rate is 50%; the finish rolling temperature is 700-850°C, and the cumulative reduction rate is 53-67%; After rolling, water-cool at a cooling rate of 2-30°C / s to a final cooling temperature of 300-550°C.
[0065] Gas-electric vertical welding is used to weld steel plates with different thicknesses one by one, and the welding line energy is 200-400k...
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Abstract
The invention discloses a thick steel plate with excellent tenacity for an excellent-tenacity welding heat affected zone and a manufacturing method thereof. The method comprises the following steps: 1) smelting, refining and continuously casting, wherein the thick steel plate comprises the following components by mass percent: 0.05-0.09% of C, 0.10-0.30% of Si, 1.2-1.6% of Mn, no more than 0.02% of P, 0.001-0.006% of S, 0.20-0.40% of Ni, 0.15-0.3% of Cu, 0.005-0.03% of Ti, 0.003-0.1% of Al, 0.0005-0.005% of Ca, no more than 0.02% of REM, no more than 0.02% of Zr, 0.0002-0.005% of B, 0.001-0.006% of N and the balance of Fe and inevitable impurities, wherein Ti / N is smaller than or equal to 6 and greater than or equal to 1; 2) rolling; 3) cooling. By adopting the manufacturing method, occluded foreign inclusions in fine dispersed distribution can be formed. By controlling the surface density of a micron occluded foreign substance of which the diameter is greater than or equal to 1 micron, the Ca / Al ratio and the length-width ratio of the occluded foreign inclusions, the surface density, the Ca / Al ratio and the length-width ratio of micron inclusions of which the diameter is greater than or equal to 1 micron, the surface density of a submicron occluded foreign substance of which the diameter is smaller than 1 micron, the tensile strength of base metal is greater than or equal to 510MPa, the welding line energy is 200-400 kJ / cm, and the welding heat affected zone has good impact toughness.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgy and iron and steel materials, and in particular relates to a thick steel plate with excellent toughness in the heat-affected zone of welding and a manufacturing method thereof. / cm, the average Charpy impact energy of the welding heat-affected zone of the steel plate at -40°C is above 50J, the welding heat-affected zone (HAZ) has good impact toughness, and the steel can be used in shipbuilding, construction, offshore platforms, bridges, pressure Welded structures in fields such as containers and oil and gas pipelines. Background technique [0002] For shipbuilding, construction, offshore platforms, bridges, pressure vessels, and oil and gas pipelines, in recent years, steel with a plate thickness of more than 50mm and a parent material with a tensile strength ≥ 510MPa has been widely used. In order to improve the welding efficiency of these thick steel plates, large input energy, single-p...
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