A kind of high corrosion resistance high aluminum content low density steel and its preparation method

A low-density steel and high corrosion-resistant technology, applied in the field of metal materials, can solve the problems of impact toughness and corrosion resistance, low corrosion performance, low density and high strength, etc.

Active Publication Date: 2020-08-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the structure formed by austenite transformation is the hard phase in the two phases, which will reduce the toughness of the material, and Cu precipitation during tempering will also reduce the toughness of the material
Therefore, the impact toughness of the high-aluminum low-density medium-thick plate disclosed in the patent CN103484771B is predictably poor
[0004] Patent Publication No. CN106498278 discloses a preparation method of high-strength, high-elongation, low-density medium-thick plate, which realizes low-density, high-strength and solves the problem of low-temperature impact toughness, but obtains a multi-phase structure, which also exists Corrosion performance is lower than the problem of single-phase structure
[0005] Patent Publication No. CN101033520A discloses the composition and preparation method of an AlSi type economical weathering steel. This patent has good corrosion performance compared to Q235 steel by adding Al, Si, P and RE elements to Q235 steel, but Its undisclosed impact properties
According to the composition described in the patent CN101033520A, it can be inferred that the obtained microstructure is similar to that of the low-density medium-thick plate described in the patent CN103484771B. It is predictable that the atmospheric corrosion-resistant steel described in the patent CN101033520A also has impact toughness and corrosion resistance. The problem

Method used

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  • A kind of high corrosion resistance high aluminum content low density steel and its preparation method
  • A kind of high corrosion resistance high aluminum content low density steel and its preparation method
  • A kind of high corrosion resistance high aluminum content low density steel and its preparation method

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Effect test

Embodiment 1

[0030] The steel grade composition (mass percentage) of embodiment 1 of the present invention is as shown in table 1

[0031] Table 1: Alloy composition (wt%)

[0032]

[0033]

[0034] After forging, the steel billet with a thickness of 170mm is held at a homogenization temperature of 1100°C for 100 minutes for homogenization treatment, and then rolled at 1000°C. The rolling is divided into 3 stages, the first stage is rolling in the recrystallization zone, 3 passes , the pass reduction rates were 15.8%, 16.6%, 17.3%, the pass intervals were 6s, 8s, 10s, and the final rolling temperature was 960°C; In the first stage, the rolling direction is rolled at 60°, 3 passes, the pass reduction rates are 22.0%, 23.1%, 23.3%, and the pass intervals are 10s, 12s, 15s; the third stage is non-recrystallization Longitudinal rolling in the zone, the same as the rolling direction of the first stage, 3 passes, the pass reduction rates are 26.1%, 26.5%, 28%, the pass intervals are 15s, ...

Embodiment 2

[0037] The steel grade composition (mass percentage) of embodiment 2 of the present invention is as shown in table 2

[0038] Table 2: Alloy composition (wt%)

[0039] C Al mn Ni Si Nb Mo Ce Fe 0.02 4.26 0.051 1.08 0.19 0.018 0.41 0.030 margin

[0040] After forging, the steel billet with a thickness of 170mm is held at a homogenization temperature of 1150°C for 80 to 120 minutes for homogenization treatment, and then rolled at 1000°C. The rolling is divided into 3 stages, the first stage is rolling in the recrystallization zone, and 3 Passes, pass reduction rates were 15.3%, 15.9%, 17.2%, pass intervals were 5s, 8s, 9s, finish rolling temperature was 955°C; Rolling at an angle of 60° to the rolling direction of the first stage, 3 passes, the pass reduction rates are 20.8%, 21.0%, 21.8%, and the pass intervals are 11s, 13s, 15s; the third stage is not Longitudinal rolling in the recrystallization zone, the same rolling direction as th...

Embodiment 3

[0043] The steel grade composition (mass percentage) of embodiment 3 of the present invention is as shown in table 3

[0044] Table 3: Alloy composition (wt%)

[0045] C Al mn Ni Si Nb Mo Ce Fe 0.018 4.26 0.042 1.06 0.19 0.020 0.29 0.032 margin

[0046] After forging, the steel billet with a thickness of 150mm is held at a homogenization temperature of 1150°C for 80 to 120 minutes for homogenization treatment, and then rolled at 1000°C. The rolling is divided into 3 stages, the first stage is rolling in the recrystallization zone, and 3 stages Passes, pass reduction rates were 16.0%, 17.5%, 19.2%, pass intervals were 6s, 9s, 10s, finish rolling temperature was 965°C; Rolling at an angle of 75° to the rolling direction of the first stage, 3 passes, the pass reduction rates are 21.4%, 25.7%, 26.5%, and the pass intervals are 11s, 14s, 14s; the third stage is not Longitudinal rolling in the recrystallization zone, the same rolling direct...

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Abstract

The invention provides a preparation method of a high-corrosion-resistance high-aluminum-content low-density medium-thickness plate for an ocean platform. Steel, comprises, by weight, 0.010%-0,035% ofC, 4.01%-6.00% of Al, 0.010%-0.20% of Mn, 1.00%-3.00% of Ni, 0.010%-0.30% of Si, 0.008%-0.020% of Nb, 0.10%-0.80% of Mo, 0.00%-0.050% of Ce, less than or equal to 0.015% of P, and less than or equalto 0.005% of S, and other Fe and impurities. Components and tissue are controlled, so that the corrosion resistance of the steel in the marine atmospheric environment can be higher 50% or above than that of common alloy steel Corten-A, and the density is reduced by 6% or above.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of high-corrosion-resistant high-aluminum low-density steel for offshore platforms. Background technique [0002] With the continuous development of my country's ocean development, the demand for steel for offshore platforms continues to expand. The current total annual demand for steel for offshore platforms is more than 1 million tons. According to the "Medium and Long-Term Development Plan of the Offshore Engineering Equipment Manufacturing Industry", it is estimated that the average annual renewal and new addition will be about 50, and the steel consumption of offshore platforms is expected to reach more than 2 million tons. Due to the long-term environment of high (low) temperature, high pressure, high humidity, chlorine salt corrosion and marine biological erosion, the steel used for offshore platforms will undergo severe electrochemical corro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/08C22C38/12C22C38/02C21D8/02
CPCC21D8/0226C21D2211/005C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 王学敏刘丹徐翔宇延泽鹏尚成嘉杨善武
Owner UNIV OF SCI & TECH BEIJING
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