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Low-yield-ratio, ultra-high-strength and high-tenacity steel for pressure-resisting shell, and preparation method of low-yield-ratio, ultra-high-strength and high-tenacity steel

A technology of pressure-resistant shell and low yield ratio, which is applied in the field of ultra-high-strength and high-toughness steel with low yield ratio and ultra-high-strength high-toughness steel for pressure-resistant shells with low yield ratio, which can solve the problem of high yield ratio of samples. problems, to achieve the effects of excellent low temperature impact toughness, ultra-high strength, and excellent weldability

Active Publication Date: 2020-09-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield ratio of the sample after the "quenching + tempering" process is too high, generally above 0.95

Method used

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  • Low-yield-ratio, ultra-high-strength and high-tenacity steel for pressure-resisting shell, and preparation method of low-yield-ratio, ultra-high-strength and high-tenacity steel
  • Low-yield-ratio, ultra-high-strength and high-tenacity steel for pressure-resisting shell, and preparation method of low-yield-ratio, ultra-high-strength and high-tenacity steel
  • Low-yield-ratio, ultra-high-strength and high-tenacity steel for pressure-resisting shell, and preparation method of low-yield-ratio, ultra-high-strength and high-tenacity steel

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Effect test

Embodiment 1

[0034] A low yield ratio (≤0.9) high-strength and high-toughness pressure-resistant casing steel of the present invention is smelted molten steel according to the set composition and cast into a slab, and the composition is by weight percentage: 0.085%C, 0.25%Si, 0.75% %Mn, 0.50% Mo, 0.6% Cr, 7.20% Ni, 0.12% V, and the balance is Fe and unavoidable impurities.

[0035]Heat the slab to 1200°C, keep it warm for 3 hours, and then carry out two-stage hot rolling; the rolling temperature of the first stage is 1150-1000°C, the reduction rate is 50%, the rolling temperature of the second stage is 920-750°C, and the reduction rate is 50% %, and finally the steel plate is hot-rolled to 12.5 mm; the hot-rolled high-temperature steel plate is air-cooled to room temperature. The hot-rolled steel plate samples were heated to 800°C and held for 30 minutes, water quenched to room temperature; then heated to 655°C again, held for 30 minutes, water quenched to room temperature; finally tempere...

Embodiment 2

[0038] A low yield ratio (≤0.9) high-strength and high-toughness pressure-resistant casing steel of the present invention is smelted molten steel according to the set composition and cast into a slab, and the composition is by weight percentage: 0.085%C, 0.25%Si, 0.75% %Mn, 0.50% Mo, 0.6% Cr, 7.20% Ni, 0.12% V, and the balance is Fe and unavoidable impurities.

[0039] Heat the slab to 1200°C, keep it warm for 3 hours, and then carry out two-stage hot rolling; the rolling temperature of the first stage is 1150-1000°C, the reduction rate is 50%, the rolling temperature of the second stage is 920-750°C, and the reduction rate is 50% %, and finally the steel plate is hot-rolled to 12.5 mm; the hot-rolled high-temperature steel plate is air-cooled to room temperature. The hot-rolled steel plate samples were heated to 800°C and held for 30 minutes, water quenched to room temperature; then heated to 680°C again, held for 30 minutes, water quenched to room temperature; finally temper...

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Abstract

The invention discloses low-yield-ratio, ultra-high-strength and high-tenacity steel for a pressure-resisting shell, and a preparation method of the low-yield-ratio, ultra-high-strength and high-tenacity steel. The low-yield-ratio, ultra-high-strength and high-tenacity steel is prepared from the chemical components in percentage by weight: 0.05-0.10% of C, 0.15-0.35% of Si, 0.60-1.00% of Mn, 0.10-0.50% of Cu, 0.10-1.00% of Mo, 0.40-0.70% of Cr, 0.05-0.15% of V, 5.00-10.00% of Ni, and the balance of Fe and inevitable impurities. According to the technical scheme, two times of quenching heat treatment is adopted, first-time quenching is conducted to enable the steel to be completely austenitized, then second-time quenching and tempering are conducted, finally heterogeneous structures such astempered martensite, critical ferrite and residual austenite are obtained, and thus performance index requirements of a low yield ratio, ultra high strength and high tenacity are met, so that application of the low-yield-ratio, ultra-high-strength and high-tenacity steel in practice is promoted.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a low-yield-ratio ultra-high-strength high-toughness steel with excellent strength and toughness, in particular to a low-yield ratio (≤0.9) ultra-high-strength, high-toughness pressure-resistant shell steel. Background technique [0002] Steel for submarine pressure hull is an important structural material for building ship hulls. With the continuous improvement of submarine combat technical performance requirements, higher requirements are put forward for the performance of submarine pressure shell steel. Submarines generally sail and fight in environments where the underwater temperature is -2.2 to 28.8°C and the surface temperature is -34 to 49°C. During the submarine's service, the hull will be subject to periodic alternating loads, and it may also be attacked by enemy anti-submarine weapons. Therefore, the pressure-resistant shell material is required to have high spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C21D8/0226C21D1/18C21D2211/008C21D2211/005C21D2211/001C21D9/46C21D8/005
Inventor 叶其斌阚立烨王昭东王庆海周成王益民田勇
Owner NORTHEASTERN UNIV LIAONING
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