Steel plate for low-temperature pressure container and manufacturing method thereof
A technology for a pressure vessel and a manufacturing method, which is applied to the steel plate for low-temperature pressure vessel and its manufacturing field, can solve the problems of insufficiency, increased cost, difficult heating and rolling process, etc., and achieves low production cost, improved technical level, and improved transportation efficiency. and economic effects
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Embodiment 1~7
[0036] Examples 1-7 all produced steel according to the following steps:
[0037] 1) Through converter smelting to realize vanadium microalloying, blowing nitrogen at the bottom of the ladle furnace to heat up, vacuum to remove gas inclusions and control the level of N content in steel to achieve vanadium-nitrogen microalloying. After continuous casting, the billet is heated and controlled The heating temperature is 1170~1260℃, and the heating rate is controlled at 8~14min / cm;
[0038] 2) For hot rolling, control the start-rolling temperature to be no less than 1070°C, control the cumulative reduction of the last three passes to be no less than 30%; control the final rolling temperature to be no less than 860°C;
[0039] 3) The normalizing process is used for heat treatment, the normalizing temperature is controlled at 920~960℃, and the heat preservation time: 30~40 minutes + plate thickness in millimeters × 1 minute / mm.
[0040] Among them, Table 1 shows the chemical composition valu...
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