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A kind of tempered sorbite high-strength and tough stainless structural steel for marine use and preparation method thereof

A tempered sorbite, strong and tough stainless technology, applied in the field of iron and steel metallurgy and the field of seismic stainless steel materials for building structures, to achieve the effect of prolonging the safety life and expanding the living space

Active Publication Date: 2020-08-07
王萍 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is how to provide a high-strength and tough stainless structural steel with high corrosion resistance and earthquake resistance for high-temperature, high-salt, and high-humidity marine environments, so as to overcome the problem of short engineering life in marine development and construction

Method used

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preparation example Construction

[0041] Wherein, the preparation method of the tempered sorbite high-strength and tough stainless structural steel for marine use comprises the following steps:

[0042] S1. The raw material is the surface ore of low-phosphorus laterite nickel ore, and the heavy metal elements in the ore are also required to be as low as possible to ensure that the total amount of As, Sn, Pb, Sb, and Bi in hot metal in blast furnace or electric furnace is not greater than 150ppm, and the individual amount is not greater than 50ppm; Melt iron is smelted by blast furnace or submerged electric furnace and sent to AOD for blowing; or molten iron obtained by smelting low-nickel iron ingots in induction furnace or electric arc furnace is sent to AOD for blowing; the marine tempering Soxhlet is completed in the AOD blowing process The adjustment of the lower limit target of the main alloying elements C, Cr, Ni, Mn, Si of the high-strength and tough stainless structural steel;

[0043] S2. Transfer the...

Embodiment 1

[0057] A tempered sorbite high-strength and tough stainless structural steel for marine use in coastal climates, the basic composition of the tempered sorbite high-strength and tough stainless structural steel for marine is calculated by mass percentage: C 0.12wt%, Si 0.6wt%, Mn0.7wt%, Cr 18.0wt%, Ni 1.5wt%, Al 0.02wt%, P 0.05wt%, S 0.010wt%, all O≤40ppm, the rest is Fe and unavoidable impurities.

[0058] Among them, the metallographic structure of the tempered sorbite high-strength and tough stainless structural steel for marine use is chromium carbides uniformly distributed on the ferrite matrix with an average size of 450 nanometers, also known as tempered sorbite; the grain average The size is less than 10 microns.

[0059] Wherein, the chromium content of the tempered sorbite high-strength stainless structural steel for marine use is 18wt%, and its neutral salt spray corrosion resistance is better than or equal to 2205 duplex stainless steel and 316 stainless steel, and ...

Embodiment 2

[0074] A kind of tempered sorbite high-strength and tough stainless structural steel for marine use in general seawater, the basic composition of the tempered sorbite high-strength and tough stainless structural steel for marine is calculated by mass percentage: C 0.10wt% , Si 0.6wt%, Mn0.7wt%, Cr 21.0wt%, Ni 2.0wt%, Mo 1.2wt%, Al 0.02wt%, P 0.03wt%, S 0.010wt%, all O ≤ 30ppm, the rest is Fe and unavoidable impurities.

[0075] Among them, the metallographic structure of the tempered sorbite high-strength and tough stainless structural steel for marine use is chromium carbides uniformly distributed on the ferrite matrix with an average size of 350 nanometers, also known as tempered sorbite; the grain average The size is less than 10 microns.

[0076] Wherein, the chromium content of the tempered sorbite high-strength and tough stainless structural steel for marine use is 21wt%, and its corrosion resistance to neutral salt spray is similar to that of austenitic 316L stainless ...

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Abstract

The invention provides a tempered sorbite high-strength and tough stainless structural steel for marine use and a preparation method thereof, belonging to the field of iron and steel metallurgy and the field of anti-seismic stainless steel materials for building structures. Its basic composition is calculated by mass percentage: C 0.07‑0.16wt%, Si 0.4‑1.5wt%, Mn≤1.0wt%, Cr 17.0‑26.0wt%, Ni 1.5‑2.5wt%, Mo≤1.5wt%, Al 0.01‑0.05wt%, P≤0.05wt%, S≤0.020wt%, all O≤40ppm, and the rest are Fe and unavoidable impurities. The invention is a high-strength and tough stainless structural steel suitable for coastal and offshore building structures that is resistant to coastal climate and general seawater corrosion, and also has an earthquake-resistant function, and meets the urgent need for high-corrosion-resistant steel in high-temperature, high-salt, and high-humidity marine environments. need.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and the field of anti-seismic stainless steel materials for building structures, and relates to a marine tempered sorbite high-strength and tough stainless structural steel suitable for marine engineering structures and resistant to marine climate and general seawater corrosion and a preparation method thereof. Background technique [0002] With the development of society, human beings are building more and more marine projects. However, due to the limitation of the performance of existing steel types, carbon steel is still the main steel used in marine engineering structures. Some marine engineering steels cannot be fully protected against rust. , the engineering life is very short. This severely limits the time and space of human activities in the marine environment, and also hinders the progress of marine development. Especially for construction in the South China Sea, based on the hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/06C22C38/04C22C38/02C22C33/04C21C5/52C21C7/06C21C7/064C21D8/02C21D1/18
CPCC21C5/52C21C7/0056C21C7/06C21C7/064C21D1/18C21D8/0205C21D8/0247C21D2211/009C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44Y02P10/20
Inventor 王平赵永璞
Owner 王萍
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