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High-strength and low-temperature-resistant hull-structure steel plate and preparation method thereof

A low-temperature-resistant and high-strength technology, applied in the field of high-strength and low-temperature-resistant hull structural steel plates and their preparation, can solve problems such as high capital investment, high energy consumption, and complex processes

Active Publication Date: 2019-01-04
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are complex process, many equipments, long production line, high infrastructure investment; long production cycle and high energy consumption

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0042] A high-strength low-temperature-resistant steel for ship structures, the composition weight percent of which is: C: 0.12-0.13%, Si: 1.0-1.1%, Mn: 1.50-1.80%, P: ≤0.010%, S: ≤0.002%, Nb: 0.03-0.04%, Ti: 0.02-0.03%, Al: 0.5-1.0%, Cr: 0.6-0.7%, Cu: 0.5-0.6%, Ni: 1.4-1.5%, Mo: 0.4-0.5%, Sb : 0.05-0.1%, N: 0.002-0.0035%, Mg: 0.001-0.003%, Ca: 0.001-0.005%, B: 0.001-0.003%, Ti / N between 7-10, Ti / Mg between 8- Between 20, the rest is Fe and unavoidable impurities,

[0043] The preparation method is characterized in that: the process route includes: smelting→refining→continuous casting→rough rolling→finish rolling→cooling and leveling; the specific steps are as follows:

[0044] (1) KR molten iron is pretreated to remove S, and the S in the molten iron is controlled to be less than or equal to 0.005%. Afterwards, the top-bottom combined blowing converter smelting is carried out. The mass ratio of molten iron to scrap steel is 8:1. Scrap steel is added first, and then molten ir...

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Abstract

The invention relates to a high-strength and low-temperature-resistant hull-structure steel plate and a preparation method thereof. The high-strength and low-temperature-resistant hull-structure steelis at least composed of C, Si, Mn, P, S, Nb, Ti, Al, Cr, Cu, Ni, Mo, Sb, N, Mg, Ca, B and the balance Fe and inevitable impurities. After smelting, refining, continuous casting, rough rolling, finishing rolling, cooling and leveling to the room temperature, the microstructure of the hull-structure steel includes, by volume, 50-55% of polygonal ferrite, 20-25% of quasi-polygonal ferrite, 15-20% ofgranular bainites, 1-13% of martensites and the balance austenites and strip martensites, the yield strength is 520-580 MPa, the tensile strength is 650-750 MPa and the elongation is 20-30% and the absorption energy of transverse V-shaped impact at -40 DEG C is more than 120 J.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a high-strength low-temperature-resistant ship hull structural steel plate and a preparation method thereof. Background technique [0002] The price of marine steel accounts for about 15-20% of the cost of shipbuilding production, and more than 70% of the supply price of ship raw materials. The steel products demanded by the shipbuilding industry mainly include plates, profiles and pipes, among which plates are the main products. With the substantial increase in shipbuilding output and the requirements for large-scale, lightweight, specialized and high-tech ships, the development trend of shipbuilding steel in the future is: the demand for low-alloy high-strength steel will increase significantly; The board will be larger; the specifications and dimensional accuracy will be higher; the quality will be further improved, and the variety will increase. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58C22C38/60C21D8/02C21D9/00
CPCC21D8/0226C21D9/0081C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58C22C38/60Y02P10/20
Inventor 张觉灵杨海西曹喜军胡建利
Owner JINGYE STEEL CO LTD
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