A kind of 440mpa grade high nitrogen easily weldable steel and its preparation method
An easy-to-weld, high-nitrogen technology, applied in the field of ship and marine engineering steel, can solve the problems of poor strength, poor weldability, and poor toughness of alloy steel, and achieve the goal of improving toughness, improving toughness, and inhibiting austenite growth. Effect
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[0053] On the other hand, the present invention provides a kind of preparation method of 440MPa level high-nitrogen easily weldable steel, and the steps comprise:
[0054] Step 1: molten iron pretreatment;
[0055] Step 2: converter smelting;
[0056] A converter is used to smelt the pretreated molten iron, and after the smelting is completed, the converter is tapped.
[0057] Step 3. Nitrogen increase;
[0058] After the converter is tapped, adjust the oxygen activity range of the molten steel to ≤80ppm, and use the wire feeder to feed vanadium nitrogen or high nitrogen manganese iron alloy wire into the ladle to adjust to the target nitrogen content.
[0059] Step 4: refining;
[0060] The refining process includes LF refining and RH refining.
[0061] Step 5: continuous casting;
[0062] In order to obtain a continuous casting slab with uniform composition and fewer surface defects, the continuous casting adopts the water volume scheme of strong cooling in the crystall...
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