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A kind of marine high-strength steel and preparation method thereof

A high-strength steel and marine technology, applied in the field of marine materials, can solve problems such as stress corrosion cracking and stress corrosion, and achieve the effects of enhanced mechanical properties, short maintenance periods, and reduced residual stress

Active Publication Date: 2019-09-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ultra-high-strength steel has the problem of stress corrosion. Stress corrosion is corrosion caused by the long-term coexistence of specific corrosive media under tensile stress or compressive stress in rare cases. In severe cases, it will lead to stress corrosion cracking. The current statistics of stress corrosion accidents show that more than 80% of the accidents are caused by chlorides

Method used

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preparation example Construction

[0031] The preparation method of the high-strength steel for marine use comprises the following steps:

[0032] (1) Electromagnetic stirring is carried out after melting BR1500HS steel, pure nickel, pure chromium and pure molybdenum to obtain molten steel;

[0033] (2) carrying out continuous casting and rolling with the molten steel that described step (1) obtains, obtains rolling plate;

[0034] (3) Carrying out homogenization annealing and heat treatment sequentially on the rolled sheet material obtained in the step (2) to obtain high-strength steel for marine use.

[0035] The invention provides a high-strength steel for marine use, which comprises the following components in weight percent according to the element composition: C 0.22%, Si 0.25%, Mn 1.3-1.5%, Cr 1.8-2%, Mo 0.8-1% , Ni 2.4~2.8%, B0.003%, S 0.006%, P 0.015%, and the balance is Fe. The invention improves the raw material ratio of the original ultra-high strength steel (BR1500HS steel), adding 1.8-2wt% Cr, 0...

Embodiment 1

[0048] Based on BR1500HS to determine the new composition formula (wt.%): C: 0.22, Si: 0.25, Mn: 1.3, Cr: 1.8, Mo: 0.8, Ni: 2.4, B: 0.003, S: 0.006, P: 0.015, Yu The amount is iron, and the molten steel is placed in the tundish, and a constant magnetic field with a magnetic field strength of 0.3T is added for electromagnetic stirring to homogenize the components. The initial steel slab is obtained through the initial steps of melting, slag removal, converter smelting, RH furnace refining, and continuous casting. The initial steel slab is cast with protective slag blowing argon, and is divided into two parts during the rolling process. First, the continuous casting slab is heated. To 1080°C, carry out rough rolling, continuous rolling for 7 passes, and then carry out finish rolling at 950°C, continuous rolling for 7 passes, and the compression ratio after rolling is 85%. Afterwards, the hot-rolled strip is cold-rolled for 5 passes by using a five-stand cold-rolling mill, and th...

Embodiment 2

[0050] Based on BR1500HS to determine the new composition formula (wt.%): C: 0.22, Si: 0.25, Mn: 1.5, Cr: 2, Mo: 1, Ni: 2.8, B: 0.003, S: 0.006, P: 0.015, Yu The amount is iron, and the molten steel is placed in the tundish, and a constant magnetic field with a magnetic field strength of 0.3T is added for electromagnetic stirring to homogenize the components. The initial steel slab is obtained through the initial steps of melting, slag removal, converter smelting, RH furnace refining, and continuous casting. The initial steel slab is cast with protective slag blowing argon, and is divided into two parts during the rolling process. First, the continuous casting slab is heated. To 1080°C, carry out rough rolling, continuous rolling for 5 passes, and then carry out finish rolling at 950°C, continuous rolling for 5 passes, and the compression ratio after rolling is 85%. Afterwards, the hot-rolled strip is cold-rolled for 5 passes by using a five-stand cold-rolling mill, and the ro...

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Abstract

The invention provides an ocean high-strength steel, and belongs to the field of ocean materials. The ocean high-strength steel has the advantages that the proportional ratio of the raw materials of the original BR1500HS steel is improved, the elements of Cr (chromium), Mo (molybdenum) and Ni (nickel) are added, and the electromagnetic stirring, continuous casting and continuous rolling technologyis adopted in the preparation process, so that the self residual stress is reduced, and the ability of resisting the erosion of chloride ions by the material is greatly improved because of the introducing of Cr, Mo and Ni; by performing equalizing annealing and heat treatment, the mechanical property of the ocean high-strength steel is enhanced; the prepared ocean high-strength steel can meet theuse requirements of high-strength steel, and can resist the erosion by the chloride and the stress corrosion; when the ocean high-strength steel is applied to the ship structure materials, the coating requirement is low, the maintenance cycle is short, the service life is long, and more economic effects are realized.

Description

technical field [0001] The invention relates to the technical field of marine materials, in particular to a high-strength steel for marine use and a preparation method thereof. Background technique [0002] High-strength steel has high strength and corrosion resistance, as well as excellent toughness, weldability, low magnetism, processability, fatigue resistance and stability. It is an important basic material for the development of naval ships, and its corrosion resistance is the advanced nature of ships. and one of the decisive factors of safety. Therefore, the development and application of high-strength steel for naval ships is of great significance and value. With the continuous improvement of the strength of steel used for ships, especially the gradual increase of the submarine's diving depth and the continuous increase of pressure, the corrosion problems of ships have become more complicated and diversified. [0003] In the prior art, the ultra-high-strength steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/54C21D8/02C21D1/25
Inventor 钟庆东徐云祥罗均鲁雄刚孙中渠蒲华燕彭艳谢少荣
Owner SHANGHAI UNIV