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CN-122007162-A - Preparation process of low-temperature corrosion-resistant steel

CN122007162ACN 122007162 ACN122007162 ACN 122007162ACN-122007162-A

Abstract

The invention relates to the technical field of alloy steel, and provides a preparation process of low-temperature corrosion-resistant steel, which comprises the following steps of smelting, continuous casting, heating and hot rolling, wherein the hot rolling comprises rough rolling and finish rolling, water-based nano lubricating liquid is needed in the rough rolling and finish rolling processes, the water-based nano lubricating liquid comprises, by weight, 0.7% -1.6% of filler, 3% -4.8% of auxiliary agent and the balance of water, the filler comprises nano aluminum oxide, and the nano aluminum oxide comprises nano aluminum oxide particles and flaky nano aluminum oxide with a mass ratio of 3-4:1. Through the technical scheme, the problem of insufficient corrosion resistance of low-temperature steel in the prior art is solved.

Inventors

  • SONG XIN
  • FENG GUANGHONG
  • DI LIN
  • MAO GUOHUI
  • JI WEI
  • LIAN XINTONG
  • GUO JUNCHENG
  • ZHANG HONGLIANG
  • MA DENG
  • DONG JIANSHENG

Assignees

  • 秦皇岛佰工钢铁有限公司

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. A preparation process of low-temperature corrosion-resistant steel is characterized by comprising the following steps of smelting, continuous casting, heating and hot rolling; the hot rolling comprises rough rolling and finish rolling; the water-based nano lubricating liquid is needed to be used in the rough rolling and finish rolling processes; the water-based nano lubricating liquid consists of 0.7-1.6% of filler, 3-4.8% of auxiliary agent and the balance of water in percentage by weight; The filler comprises nano alumina; The nano aluminum oxide comprises nano aluminum oxide particles and flaky nano aluminum oxide with the mass ratio of 3-4:1.
  2. 2. The preparation process of the low-temperature corrosion-resistant steel according to claim 1 is characterized in that the auxiliary agent comprises, by weight, 1.4% -2.0% of anionic dispersing agent, 0.6% -0.8% of wetting agent and 1% -2% of polyethylene glycol.
  3. 3. The process for preparing low-temperature corrosion resistant steel according to claim 1, wherein said filler further comprises nano titanium dioxide; the mass ratio of the nano aluminum oxide to the nano titanium dioxide is 1.5:0.8-1.
  4. 4. A process for preparing a low temperature corrosion resistant steel according to claim 3, wherein the particle size of the flake nano alumina is 3nm; the particle size of the nano aluminum oxide particles is 20-30 nm; the particle size of the nano titanium dioxide is 10-15 nm.
  5. 5. A process for the preparation of a low temperature corrosion resistant steel according to claim 1, wherein said hot rolling further comprises descaling, cooling and coiling.
  6. 6. The process for preparing low-temperature corrosion-resistant steel according to claim 1, wherein the casting temperature in the continuous casting process is 1450-1550 ℃, and the casting speed is 0.9-1.2 m/min; The heating temperature is 1150-1250 ℃ and the heating time is 2-4 hours; The initial rolling temperature of rough rolling is 1120-1150 ℃, the final rolling temperature is 1050-1080 ℃, the rough rolling is carried out for 3-5 times, and the accumulated reduction rate is more than or equal to 50%; The initial rolling temperature of the finish rolling is 950-1000 ℃, the final rolling temperature is 800-820 ℃, the finish rolling is 4-6 times, and the accumulated reduction rate is more than or equal to 60%.
  7. 7. The process for preparing low-temperature corrosion resistant steel according to claim 2, wherein said anionic dispersant comprises one of sodium polyacrylate and ammonium polyacrylate; the wetting agent comprises sodium dodecyl benzene sulfonate.
  8. 8. The process for preparing low-temperature corrosion-resistant steel according to claim 5, wherein the pressure of the descaling is 20-25 MPa; when the cooling is performed, the water temperature of laminar flow water is 25-30 ℃, and the cooling speed is 15-25 ℃ per second; the coiling temperature is 550-650 ℃.
  9. 9. The process for preparing low-temperature corrosion-resistant steel according to claim 2, wherein the preparation method of the water-based nano lubricating liquid comprises the following steps: adding polyethylene glycol into water, mixing, sequentially adding anionic dispersing agent, wetting agent and filler, and uniformly mixing to obtain the water-based nano lubricating liquid.
  10. 10. A low temperature corrosion resistant steel, characterized by being prepared by the preparation process of any one of claims 1 to 9; The low-temperature corrosion-resistant steel consists of the following components in percentage by mass ：C 0.04%~0.08%、Si 0.5%~0.8%、Mn 1.5%~2.0%、P ≤0.008%、S 0.005%~0.008%、Ni 0.1%~0.3%、Cr 0.3%~0.8%、Nb 0.06%~0.12%、Cu 0.2%~0.5%、 and the balance of Fe and other unavoidable impurities.

Description

Preparation process of low-temperature corrosion-resistant steel Technical Field The invention relates to the technical field of alloy steel, in particular to a preparation process of low-temperature corrosion-resistant steel. Background When the steel is applied to environments with low temperature, large temperature difference fluctuation and complex corrosive medium, stricter requirements are put on the comprehensive performance of the steel. At present, low-temperature steel is studied very much, but the low-temperature steel is difficult to consider in terms of low-temperature and corrosion resistance, so that thick oxide scale with the thickness of more than or equal to 15 mu m is easy to generate on the surface of a steel plate in the rolling stage of a steel billet, the bonding force between the oxide scale and a steel substrate is poor, the structure is loose and easy to fall off, the thick oxide scale is difficult to thoroughly remove in the subsequent pickling process, residues are easy to form on the surface of the steel plate, and the residual oxide scale becomes a corrosion starting point in the subsequent service process and accelerates the corrosion failure of the steel. Conventional rolling lubrication technology cannot achieve rolling efficiency and oxide skin control, and is difficult to adapt to the large-scale and high-quality production requirements of high-performance low-temperature steel. Disclosure of Invention The invention provides a preparation process of low-temperature corrosion-resistant steel, which solves the problem of insufficient corrosion resistance of the low-temperature steel in the related technology. The technical scheme of the invention is as follows: the invention provides a preparation process of low-temperature corrosion-resistant steel, which comprises the following steps of smelting, continuous casting, heating and hot rolling; the hot rolling comprises rough rolling and finish rolling; the water-based nano lubricating liquid is needed to be used in the rough rolling and finish rolling processes; the water-based nano lubricating liquid consists of 0.7-1.6% of filler, 3-4.8% of auxiliary agent and the balance of water in percentage by weight; The filler comprises nano alumina; The nano aluminum oxide comprises nano aluminum oxide particles and flaky nano aluminum oxide with the mass ratio of 3-4:1. As a further technical scheme, the auxiliary agent comprises, by weight, 1.4% -2.0% of an anionic dispersing agent, 0.6% -0.8% of a wetting agent and 1% -2% of polyethylene glycol. As a further technical scheme, the filler also comprises nano titanium dioxide. As a further technical scheme, the mass ratio of the nano aluminum oxide to the nano titanium dioxide is 1.5:0.8-1. As a further technical scheme, the particle size of the flaky nano aluminum oxide is 3nm; the particle size of the nano aluminum oxide particles is 20-30 nm; the particle size of the nano titanium dioxide is 10-15 nm. According to the water-based nano lubricating liquid, 3 nm-particle-size flaky nano aluminum oxide can be more tightly arranged on the surfaces of a roller and a steel billet to form a more compact lubricating film, the effect of reducing friction coefficient is achieved, the larger-particle-size nano aluminum oxide particles can bear a certain pressure under the action of rolling force to avoid crushing, the rolling antifriction persistence is ensured, 10-15 nm-particle-size nano titanium dioxide is filled in gaps of the nano aluminum oxide particles, the overall stability and uniformity of the lubricating film are enhanced, the contact between the steel billet and oxygen is reduced, the generation of oxide scale is avoided, and therefore the final steel plate has excellent corrosion resistance. As a further aspect, the hot rolling further includes descaling, cooling and coiling. As a further technical scheme, the casting temperature in the continuous casting process is 1450-1550 ℃, and the casting speed is 0.9-1.2 m/min. As a further technical scheme, the heating temperature is 1150-1250 ℃ and the heating time is 2-4 hours. As a further technical scheme, the initial rolling temperature of rough rolling is 1120-1150 ℃, the final rolling temperature is 1050-1080 ℃, rough rolling is performed for 3-5 times, and the accumulated reduction is more than or equal to 50%. As a further technical scheme, the initial rolling temperature of the finish rolling is 950-1000 ℃, the final rolling temperature is 800-820 ℃, the finish rolling is performed for 4-6 times, and the accumulated reduction is more than or equal to 60%. As a further technical scheme, the anionic dispersing agent comprises one of sodium polyacrylate and ammonium polyacrylate. As a further technical scheme, the wetting agent comprises sodium dodecyl benzene sulfonate. As a further technical scheme, the pressure of the descaling is 20-25 MPa. As a further technical scheme, when cooling, the water temperature of laminar flow wate