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

Active Publication Date: 2022-05-13
CENT IRON & STEEL RES INST +1
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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a 440MPa high-nitrogen easy-weldable steel and its preparation method to solve the problems of poor strength, poor toughness and poor weldability of existing alloy steels

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  • A kind of 440mpa grade high nitrogen easily weldable steel and its preparation method
  • A kind of 440mpa grade high nitrogen easily weldable steel and its preparation method
  • A kind of 440mpa grade high nitrogen easily weldable steel and its preparation method

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preparation example Construction

[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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Abstract

The invention relates to a 440MPa grade high-nitrogen easily weldable steel and a preparation method thereof, belonging to the field of ship and marine engineering steel, and solving the problems of poor strength, poor toughness and poor weldability of alloy steel in the prior art. The chemical composition of the 440MPa grade high-nitrogen easy-welding steel is C≤0.06%, Si: 0.20%-0.40%, Mn: 1.10%-1.50%, P≤0.008%, S≤0.003%, Ni: 0.20% in weight percentage ~0.40%, Cr: 0.20%~0.40%, Cu: 0.20%~0.40%, Als: 0.010~0.020, Ti: 0.010%~0.030%, Nb: 0.030%~0.050%, V: 0.050%~0.080%, N: 0.010% to 0.020%; the balance is Fe and unavoidable impurity elements. The invention realizes the matching of the strength, toughness and weldability of the 440MPa grade easy-to-weld steel plate.

Description

technical field [0001] The invention relates to the technical field of steel for ships and marine engineering, in particular to a 440MPa high-nitrogen easy-to-weld steel and a preparation method thereof. Background technique [0002] In recent years, the lightweight, high-efficiency, and low-cost construction of ships and ocean engineering equipment is becoming their development direction. The structural weight reduction of ships and ocean engineering equipment requires the use of materials with higher strength levels to achieve weight reduction, while high-efficiency and low-cost construction requires an urgent need to improve welding construction efficiency. Therefore, the corresponding steel for ships and marine engineering is developing in the direction of high strength, high toughness and easy welding. At present, the most widely used steel for ships and marine engineering in China is E36 steel plate. Its main performance indicators are: yield strength ≥ 355MPa, tensil...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/06C22C38/50C22C38/48C22C38/46C21C7/00C21D8/02
CPCC22C38/02C22C38/04C22C38/42C22C38/06C22C38/50C22C38/48C22C38/46C22C38/001C21C7/0056C21C7/0006C21D8/0226C21D2211/005C21D2211/009
Inventor 柴希阳师仲然王天琪罗小兵柴锋潘涛杨才福
Owner CENT IRON & STEEL RES INST
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