Large-thickness lamellar tearing-resistant high-strength steel plate with 960 MPa-level yield strength and production method thereof
A technology of anti-lamellar tearing and yield strength, applied in heat treatment equipment, furnaces, manufacturing tools, etc., can solve the problems of reduced welding cold crack sensitivity, uniformity of the whole plate, performance deterioration, etc., to improve the thickness direction performance. , The effect of promoting degeneration and floating and improving welding performance
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[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0042] The production process of the ultra-high-strength steel of the present invention is: converter or electric furnace steelmaking -> LF refining -> VD or RH vacuum degassing -> Ca treatment -> continuous casting -> heating -> rolling -> slow cooling of steel plates -> Quenching -> Tempering
[0043] The production method of the large-thickness lamellar tear resistance 960MPa grade high-strength steel plate of the embodiment 1-2 of the present invention comprises the following steps:
[0044] (1) Smelting: use 150 tons of converter for smelting, then send it to LF furnace for refining and RH vacuum degassing treatment, and conduct Ca treatment in the air, control the Ca content of 0.001-0.005%, and softly stir the molten steel after treatment. It is less than 10 minutes to ensure that the steel sulfide and oxide are completely denatured an...
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