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Ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and preparation method

A technology of yield strength and ship plate steel, which is applied in the field of ship plate steel with a yield strength of 390MPa and its preparation, can solve the problems of large differences in the structure of extra-thick plates, poor low-temperature toughness, and large fluctuations in core performance, so as to reduce alloy costs, Effects of increasing elongation and improving low temperature toughness

Active Publication Date: 2018-05-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The second object of the present invention is to provide a method for preparing the ship plate steel, which can effectively eliminate the large structural differences in the thickness direction, large fluctuations in core properties, and poor low-temperature toughness of extra-thick plates during the controlled rolling and controlled cooling processes. question

Method used

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  • Ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and preparation method
  • Ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and preparation method
  • Ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Component content: C: 0.05%, Si: 0.21%, Mn: 1.41%, P: 0.013%, S: 0.005%, Nb: 0.035%, V: 0.045%, Al: 0.025%, Ti: 0.02%, Mo : 0.03%, Cr: 0.10%, Cu: 0.28%, Ni: 0.35%, and the rest are Fe and unavoidable impurity elements.

[0039] The preparation method comprises the following steps:

[0040] (1) Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, sequentially carry out converter or electric furnace smelting, refining outside the furnace, vacuum treatment and continuous casting process to form a continuous casting slab with a thickness of 320mm;

[0041] (2) Slab reheating: heat the prepared continuous casting slab to 1170°C and keep it warm for 0.7h;

[0042] (3) Two-stage rolling: descale the above-mentioned reheated continuous casting slab with high-pressure water to remove the iron oxide scale produced on the surface of the continuous casting slab during the heating process, and then carry out rolling in the re...

Embodiment 2

[0052] Component content: same as embodiment 1.

[0053] The preparation method comprises the following steps:

[0054] (1) Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, and sequentially carry out converter or electric furnace smelting, refining outside the furnace, vacuum treatment and continuous casting processes to form a continuous casting slab with a thickness of 320mm;

[0055] (2) Slab reheating: heat the prepared continuous casting slab to 1150°C and keep it warm for 0.5h;

[0056] (3) Two-stage rolling: descale the above-mentioned reheated continuous casting slab with high-pressure water to remove the iron oxide scale produced on the surface of the continuous casting slab during the heating process, and then carry out rolling in the recrystallization zone during rolling , and then rolling in the non-recrystallization zone; wherein, the starting rolling temperature of the recrystallization zone rolling is...

Embodiment 3

[0066] Component content: C: 0.07%, Si: 0.35%, Mn: 1.55%, P: 0.009%, S: 0.003%, Nb: 0.015%, V: 0.025%, Al: 0.025%, Ti: 0.015%, Mo : 0.06%, Cr: 0.18%, Cu: 0.18%, Ni: 0.25%, and the rest are Fe and unavoidable impurity elements.

[0067] The preparation method comprises the following steps:

[0068] (1) Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, sequentially carry out converter or electric furnace smelting, refining outside the furnace, vacuum treatment and continuous casting process to form a continuous casting slab with a thickness of 260mm;

[0069] (2) Slab reheating: heat the prepared continuous casting slab to 1200°C and keep it warm for 1h;

[0070] (3) Two-stage rolling: descale the above-mentioned reheated continuous casting slab with high-pressure water to remove the iron oxide scale produced on the surface of the continuous casting slab during the heating process, and then carry out rolling in the rec...

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Abstract

The invention discloses ship plate steel with thickness not greater than 100mm and yield strength of 390MPa and a preparation method. The ship plate steel comprises C, Si, Mn, P, S, Nb, V, Al, Ti, Mo,Cr, Cu, Ni, and the balance Fe and impurities. The preparation method comprises the following steps: heating a continuous casting slab which comprises the same components with the ship plate steel; the continuous casting slab is sequentially processed by cooling through first laminar flow, air cooling and cooling through second laminar flow after being subjected to two-section type rolling; thenthe continuous casting slab is cooled through air until room temperature is reached, thus obtaining the ship plate steel. The ship plate steel has the obvious advantages that the thickness of the shipplate steel is not greater than 100mm; the yield strength is 390MPa; the low-temperature toughness is outstanding; in addition, the component design is simple; the welding performance and the corrosion resistance are outstanding; the comprehensive mechanical property is high.

Description

technical field [0001] The invention belongs to the field of ship plate steel manufacturing, and in particular relates to a ship plate steel with a thickness of less than or equal to 100 mm and a yield strength of 390 MPa and a preparation method thereof. Background technique [0002] With the gradual implementation of the national marine economic strategy and the gradual prosperity of the marine transportation industry, container ships are becoming larger and lighter in weight, which puts forward higher and higher requirements for the performance and quality of ship plate steel. [0003] When the container ship reaches 10000TEU, the maximum thickness of the 390MPa-class ship plate is required to reach 70mm, while the 18000TEU container ship requires the maximum thickness of the 390MPa-class ship plate to reach 85mm, and the larger container ship requires a greater thickness of the 390MPa-class ship plate. [0004] However, the greater the thickness of the high-strength ship...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/46C22C38/06C22C38/50C22C38/44C22C38/42C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 邱保文崔强车马俊胡峰赵晋斌尹雨群
Owner NANJING IRON & STEEL CO LTD
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