CN113789479A - Corrosion-resistant high-strength stainless steel and preparation process thereof - Google Patents

Corrosion-resistant high-strength stainless steel and preparation process thereof Download PDF

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Publication number
CN113789479A
CN113789479A CN202110635437.2A CN202110635437A CN113789479A CN 113789479 A CN113789479 A CN 113789479A CN 202110635437 A CN202110635437 A CN 202110635437A CN 113789479 A CN113789479 A CN 113789479A
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stainless steel
corrosion
steel coil
percent
steel
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凌金桦
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Jiangsu Zhongbo Stainless Steel Products Manufacturing Co ltd
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Jiangsu Zhongbo Stainless Steel Products Manufacturing Co ltd
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    • C—CHEMISTRY; METALLURGY
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    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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    • C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
    • C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
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    • C21D7/00—Modifying the physical properties of iron or steel by deformation
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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    • C21D8/0236—Cold rolling
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Abstract

The invention relates to the technical field of stainless steel, and discloses corrosion-resistant high-strength stainless steel which comprises the following raw materials in percentage by weight: 0.90 to 1.50 percent of chromium, 0.70 to 1.20 percent of manganese, 0.20 to 0.65 percent of nitrogen, 0.20 to 0.30 percent of molybdenum, 0.13 to 0.40 percent of silicon, 0.08 to 0.14 percent of titanium, 0.007 to 0.025 percent of carbon and less than 0.10 percent of niobium. According to the corrosion-resistant high-strength stainless steel and the preparation process thereof, the surface of the steel coil is cleaned, the adhesion of a subsequent coating is improved, and a dispersion liquid formed by mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, a water glass aqueous solution, boron carbide and potassium fluoborate is sprayed on the surface of the steel coil, so that a smooth and compact high-strength coating is formed on the surface of the steel coil, the steel coil is further protected, wherein the polyimide in the dispersion liquid can improve the deposition rate of the coating and increase the bonding strength with the stainless steel.

Description

Corrosion-resistant high-strength stainless steel and preparation process thereof
Technical Field
The invention relates to the technical field of stainless steel, in particular to corrosion-resistant high-strength stainless steel and a preparation process thereof.
Background
Stainless steel is abbreviated as acid-resistant stainless steel, and steel types which are resistant to weak corrosive media such as air, steam and water or stainless steel types are referred to as stainless steel, while steel types which are resistant to corrosion by chemical corrosive media (chemical attacks such as acid, alkali and salt) are referred to as acid-resistant steel.
The stainless steel is widely applied to the fields of petroleum, chemical engineering, aerospace, nuclear industry, low-temperature engineering, ocean engineering and the like, wherein the austenitic stainless steel accounts for 70 percent of the stainless steel due to extremely strong corrosion resistance and oxidation resistance, excellent welding performance and biocompatibility, and good plasticity and toughness.
The corrosion resistance of the existing stainless steel is poor, so that the stainless steel is easy to corrode when being used for a long time, the corrosion damage of the stainless steel is caused, the service life of the stainless steel is shortened, meanwhile, the strength of the stainless steel is poor, and when the stainless steel is collided by external force, the collision damage is easy to occur, and the service life of the stainless steel is shortened.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the corrosion-resistant high-strength stainless steel and the preparation process thereof, which have the advantages of corrosion resistance and high strength and solve the problems of poor corrosion resistance and low strength.
(II) technical scheme
In order to achieve the purpose of corrosion resistance and high strength, the invention provides the following technical scheme: the corrosion-resistant high-strength stainless steel comprises the following raw materials in percentage by weight: 0.90-1.50% of chromium, 0.70-1.20% of manganese, 0.20-0.65% of nitrogen, 0.20-0.30% of molybdenum, 0.13-0.40% of silicon, 0.08-0.14% of titanium, 0.007-0.025% of carbon, less than 0.10% of niobium, less than 0.04% of phosphorus, less than 0.04% of sulfur, less than 0.035% of copper, less than 0.015% of nickel, and the balance of iron and inevitable impurities.
Preferably, 0.90% of chromium, 0.70% of manganese, 0.65% of nitrogen, 0.30% of molybdenum, 0.13% of silicon, 0.08% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
Preferably, 1.50% of chromium, 1.20% of manganese, 0.20% of nitrogen, 0.20% of molybdenum, 0.40% of silicon, 0.14% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
Preferably, 1.20% of chromium, 1.10% of manganese, 0.55% of nitrogen, 0.25% of molybdenum, 0.35% of silicon, 0.1% of titanium, 0.015% of carbon, 0.5% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
A preparation process of corrosion-resistant high-strength stainless steel comprises the following steps:
1) smelting and continuous casting: firstly, according to the mixture ratio of 0.90-1.50% of chromium, 0.70-1.20% of manganese, 0.20-0.65% of nitrogen, 0.20-0.30% of molybdenum, 0.13-0.40% of silicon, 0.08-0.14% of titanium, 0.007-0.025% of carbon, 0.04% of phosphorus, 0.04% of sulfur, 0.035% of copper and the balance of iron and inevitable impurity components, smelting molten steel by an electric furnace, then adding 0.10% of niobium and 0.015% of nickel for further smelting, and then continuously casting the molten steel into a continuous casting blank;
2) hot rolling and annealing: feeding the continuous casting slab obtained in the step 1) into a heating furnace for heating, then removing surface oxide skin through rough rolling of a rough rolling mill set, then feeding the continuous casting slab into a finish rolling mill set for finish rolling, cooling a hot steel strip from the last rolling mill of the finish rolling to a set temperature through laminar flow, rolling the hot steel strip into a steel coil through a coiling machine, and then carrying out annealing and acid pickling treatment on the steel coil to remove an oxidized surface to obtain an annealed white skin coil;
3) cold rolling and annealing: the annealed white-skin coil obtained in the step 2) is processed by a cold continuous rolling unit to obtain a cold-rolled sheet, and then is processed by annealing and pickling to obtain a cold-rolled stainless steel coil;
4) shot blasting treatment: performing shot blasting treatment on the cold-rolled stainless steel coil obtained in the step 3) to obtain a reinforced steel coil;
5) cleaning treatment: placing the reinforced steel coil obtained in the step 4) into a cleaning agent, cleaning for 5-10min by utilizing 30kHz ultrasonic waves, then removing oil by adopting a chemical method, wherein the oil removing temperature is 70 ℃, the time is 15min, repeatedly cleaning and rinsing for 2-3 times, and drying the surface by using hot air or induction heating, wherein the drying temperature is less than 50 ℃;
6) spraying the paint: mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, water glass aqueous solution, boron carbide and potassium fluoborate, forming stable dispersion liquid after ultrasonic treatment, uniformly spraying the obtained dispersion liquid on the surface of the cleaned reinforced steel coil obtained in the step 5) by using a spray gun with double nozzles, taking high-pressure air as carrier gas and taking inert gas as shielding gas, and finally forming the corrosion-resistant coating through curing and plasma oxidation treatment.
Preferably, the molten steel smelting process comprises three steps of electric furnace steel making, AOD decarburization and VOD deoxidation smelting, electromagnetic stirring is adopted in the continuous casting process, the drawing speed of a continuous casting billet is 1-1.5m/min, the annealing temperature of a steel coil is 970-1000 ℃, ceramic shot-throwing bodies are adopted for the shot-throwing bodies, and the shot-throwing amount is 50 Kg/min.
Preferably, the nano aluminum powder, the nano zinc powder and the nano yttrium powder are ground by a ball mill before use, the curing temperature is 130-150 ℃, the curing time is 4-6h, and the plasma oxidation temperature is 600 ℃.
(III) advantageous effects
Compared with the prior art, the invention provides the corrosion-resistant high-strength stainless steel and the preparation process thereof, and the corrosion-resistant high-strength stainless steel has the following beneficial effects:
1. the corrosion-resistant high-strength stainless steel and the preparation process thereof have the advantages that niobium and titanium are added into raw materials, so that carbon, niobium and titanium form carbide, the effect of improving the strength of the materials is achieved, silicon is added into the raw materials, the effects of deoxidation and corrosion resistance improvement are achieved, meanwhile, the strength of the extremely high materials can be further improved, nitrogen and chromium in the raw materials and titanium form extremely stable nitride in the processing process, the effects of further hardening and strengthening the materials are also achieved, and after the raw materials are rolled and formed, the surface oxide skin of a steel coil can be removed through shot blasting treatment, the appearance quality is improved, and meanwhile, the outer surface of the steel coil is strengthened.
2. According to the corrosion-resistant high-strength stainless steel and the preparation process thereof, the surface of the steel coil is cleaned, the adhesion of a subsequent coating is improved, and a dispersion liquid formed by mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, a water glass aqueous solution, boron carbide and potassium fluoborate is sprayed on the surface of the steel coil, so that a smooth and compact high-strength coating is formed on the surface of the steel coil, the steel coil is further protected, wherein the polyimide in the dispersion liquid can improve the deposition rate of the coating and increase the bonding strength with the stainless steel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: the corrosion-resistant high-strength stainless steel comprises the following raw materials in percentage by weight: 0.90% of chromium, 0.70% of manganese, 0.65% of nitrogen, 0.30% of molybdenum, 0.13% of silicon, 0.08% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
A preparation process of corrosion-resistant high-strength stainless steel comprises the following steps:
1) smelting and continuous casting: firstly, smelting molten steel by an electric furnace according to the mixture ratio of 0.90 percent of chromium, 0.70 percent of manganese, 0.65 percent of nitrogen, 0.30 percent of molybdenum, 0.13 percent of silicon, 0.08 percent of titanium, 0.025 percent of carbon, 0.035 percent of phosphorus, 0.035 percent of sulfur, 0.02 percent of copper and the balance of iron and inevitable impurity components, then adding 0.8 percent of niobium and 0.01 percent of nickel for further smelting, and then continuously casting the molten steel into a continuous casting billet;
2) hot rolling and annealing: feeding the continuous casting slab obtained in the step 1) into a heating furnace for heating, then removing surface oxide skin through rough rolling of a rough rolling mill set, then feeding the continuous casting slab into a finish rolling mill set for finish rolling, cooling a hot steel strip from the last rolling mill of the finish rolling to a set temperature through laminar flow, rolling the hot steel strip into a steel coil through a coiling machine, and then carrying out annealing and acid pickling treatment on the steel coil to remove an oxidized surface to obtain an annealed white skin coil;
3) cold rolling and annealing: the annealed white-skin coil obtained in the step 2) is processed by a cold continuous rolling unit to obtain a cold-rolled sheet, then the cold-rolled stainless steel coil is obtained through annealing and pickling treatment, the cold-rolled stainless steel is annealed, and the purpose of softening is achieved by eliminating work hardening through a recrystallization process, wherein the pickling purpose is to remove an oxide layer formed on the surface of the steel coil in the annealing process and passivate the surface of the stainless steel, so that the corrosion resistance of the steel coil is improved;
4) shot blasting treatment: performing shot blasting treatment on the cold-rolled stainless steel coil obtained in the step 3) to obtain a reinforced steel coil;
5) cleaning treatment: placing the reinforced steel coil obtained in the step 4) into a cleaning agent, cleaning for 5-10min by utilizing 30kHz ultrasonic waves, then removing oil by adopting a chemical method, wherein the oil removing temperature is 70 ℃, the time is 15min, repeatedly cleaning and rinsing for 2-3 times, and drying the surface by using hot air or induction heating, wherein the drying temperature is less than 50 ℃;
6) spraying the paint: mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, water glass aqueous solution, boron carbide and potassium fluoborate, forming stable dispersion liquid after ultrasonic treatment, uniformly spraying the obtained dispersion liquid on the surface of the cleaned reinforced steel coil obtained in the step 5) by using a spray gun with double nozzles, taking high-pressure air as carrier gas and taking inert gas as shielding gas, and finally forming the corrosion-resistant coating through curing and plasma oxidation treatment.
It is noted that the molten steel smelting process comprises three-step smelting of electric furnace steelmaking, AOD decarburization and VOD deoxidation, electromagnetic stirring is adopted in the continuous casting process, the drawing speed of a continuous casting billet is 1-1.5m/min, the annealing temperature of a steel coil is 970-1000 ℃, a ceramic shot-blasting body is adopted as a shot-blasting body, and the shot-blasting amount is 50 Kg/min.
It is noted that the nano aluminum powder, the nano zinc powder and the nano yttrium powder are ground by a ball mill before use, the curing temperature is 130-150 ℃, the curing time is 4-6h, and the plasma oxidation temperature is 600 ℃.
Example two: the corrosion-resistant high-strength stainless steel comprises the following raw materials in percentage by weight: 1.50% of chromium, 1.20% of manganese, 0.20% of nitrogen, 0.20% of molybdenum, 0.40% of silicon, 0.14% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
A preparation process of corrosion-resistant high-strength stainless steel comprises the following steps:
1) smelting and continuous casting: firstly, smelting molten steel by an electric furnace according to the mixture ratio of 1.50% of chromium, 1.20% of manganese, 0.20% of nitrogen, 0.20% of molybdenum, 0.40% of silicon, 0.14% of titanium, 0.025% of carbon, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper and the balance of iron and inevitable impurity components, then adding 0.8% of niobium and 0.01% of nickel for further smelting, and then continuously casting the molten steel into a continuous casting billet;
2) hot rolling and annealing: feeding the continuous casting slab obtained in the step 1) into a heating furnace for heating, then removing surface oxide skin through rough rolling of a rough rolling mill set, then feeding the continuous casting slab into a finish rolling mill set for finish rolling, cooling a hot steel strip from the last rolling mill of the finish rolling to a set temperature through laminar flow, rolling the hot steel strip into a steel coil through a coiling machine, and then carrying out annealing and acid pickling treatment on the steel coil to remove an oxidized surface to obtain an annealed white skin coil;
3) cold rolling and annealing: the annealed white-skin coil obtained in the step 2) is processed by a cold continuous rolling unit to obtain a cold-rolled sheet, then the cold-rolled stainless steel coil is obtained through annealing and pickling treatment, the cold-rolled stainless steel is annealed, and the purpose of softening is achieved by eliminating work hardening through a recrystallization process, wherein the pickling purpose is to remove an oxide layer formed on the surface of the steel coil in the annealing process and passivate the surface of the stainless steel, so that the corrosion resistance of the steel coil is improved;
4) shot blasting treatment: performing shot blasting treatment on the cold-rolled stainless steel coil obtained in the step 3) to obtain a reinforced steel coil;
5) cleaning treatment: placing the reinforced steel coil obtained in the step 4) into a cleaning agent, cleaning for 5-10min by utilizing 30kHz ultrasonic waves, then removing oil by adopting a chemical method, wherein the oil removing temperature is 70 ℃, the time is 15min, repeatedly cleaning and rinsing for 2-3 times, and drying the surface by using hot air or induction heating, wherein the drying temperature is less than 50 ℃;
6) spraying the paint: mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, water glass aqueous solution, boron carbide and potassium fluoborate, forming stable dispersion liquid after ultrasonic treatment, uniformly spraying the obtained dispersion liquid on the surface of the cleaned reinforced steel coil obtained in the step 5) by using a spray gun with double nozzles, taking high-pressure air as carrier gas and taking inert gas as shielding gas, and finally forming the corrosion-resistant coating through curing and plasma oxidation treatment.
It is noted that the molten steel smelting process comprises three-step smelting of electric furnace steelmaking, AOD decarburization and VOD deoxidation, electromagnetic stirring is adopted in the continuous casting process, the drawing speed of a continuous casting billet is 1-1.5m/min, the annealing temperature of a steel coil is 970-1000 ℃, a ceramic shot-blasting body is adopted as a shot-blasting body, and the shot-blasting amount is 50 Kg/min.
It is noted that the nano aluminum powder, the nano zinc powder and the nano yttrium powder are ground by a ball mill before use, the curing temperature is 130-150 ℃, the curing time is 4-6h, and the plasma oxidation temperature is 600 ℃.
Example three: the corrosion-resistant high-strength stainless steel comprises the following raw materials in percentage by weight: 1.20% of chromium, 1.10% of manganese, 0.55% of nitrogen, 0.25% of molybdenum, 0.35% of silicon, 0.1% of titanium, 0.015% of carbon, 0.5% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
A preparation process of corrosion-resistant high-strength stainless steel comprises the following steps:
1) smelting and continuous casting: firstly, smelting molten steel by an electric furnace according to the mixture ratio of 1.20% of chromium, 1.10% of manganese, 0.55% of nitrogen, 0.25% of molybdenum, 0.35% of silicon, 0.1% of titanium, 0.015% of carbon, 0.035% of phosphorus, 0.035% of sulfur and 0.02% of copper, and the balance of iron and inevitable impurity components, then adding 0.5% of niobium and 0.01% of nickel for further smelting, and then continuously casting the molten steel into a continuous casting billet;
2) hot rolling and annealing: feeding the continuous casting slab obtained in the step 1) into a heating furnace for heating, then removing surface oxide skin through rough rolling of a rough rolling mill set, then feeding the continuous casting slab into a finish rolling mill set for finish rolling, cooling a hot steel strip from the last rolling mill of the finish rolling to a set temperature through laminar flow, rolling the hot steel strip into a steel coil through a coiling machine, and then carrying out annealing and acid pickling treatment on the steel coil to remove an oxidized surface to obtain an annealed white skin coil;
3) cold rolling and annealing: the annealed white-skin coil obtained in the step 2) is processed by a cold continuous rolling unit to obtain a cold-rolled sheet, then the cold-rolled stainless steel coil is obtained through annealing and pickling treatment, the cold-rolled stainless steel is annealed, and the purpose of softening is achieved by eliminating work hardening through a recrystallization process, wherein the pickling purpose is to remove an oxide layer formed on the surface of the steel coil in the annealing process and passivate the surface of the stainless steel, so that the corrosion resistance of the steel coil is improved;
4) shot blasting treatment: performing shot blasting treatment on the cold-rolled stainless steel coil obtained in the step 3) to obtain a reinforced steel coil;
5) cleaning treatment: placing the reinforced steel coil obtained in the step 4) into a cleaning agent, cleaning for 5-10min by utilizing 30kHz ultrasonic waves, then removing oil by adopting a chemical method, wherein the oil removing temperature is 70 ℃, the time is 15min, repeatedly cleaning and rinsing for 2-3 times, and drying the surface by using hot air or induction heating, wherein the drying temperature is less than 50 ℃;
6) spraying the paint: mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, water glass aqueous solution, boron carbide and potassium fluoborate, forming stable dispersion liquid after ultrasonic treatment, uniformly spraying the obtained dispersion liquid on the surface of the cleaned reinforced steel coil obtained in the step 5) by using a spray gun with double nozzles, taking high-pressure air as carrier gas and taking inert gas as shielding gas, and finally forming the corrosion-resistant coating through curing and plasma oxidation treatment.
It is noted that the molten steel smelting process comprises three-step smelting of electric furnace steelmaking, AOD decarburization and VOD deoxidation, electromagnetic stirring is adopted in the continuous casting process, the drawing speed of a continuous casting billet is 1-1.5m/min, the annealing temperature of a steel coil is 970-1000 ℃, a ceramic shot-blasting body is adopted as a shot-blasting body, and the shot-blasting amount is 50 Kg/min.
It is noted that the nano aluminum powder, the nano zinc powder and the nano yttrium powder are ground by a ball mill before use, the curing temperature is 130-150 ℃, the curing time is 4-6h, and the plasma oxidation temperature is 600 ℃.
The invention has the beneficial effects that:
1. through adding niobium and titanium in the raw materials, make carbon and niobium, titanium forms the carbide, play the effect that improves material strength, through adding silicon in the raw materials, play the effect of deoxidization and improvement corrosion resistance, simultaneously can also further high material's intensity, nitrogen and chromium in the raw materials, titanium form extremely stable nitride in the course of working, also play the effect to further hardening and reinforceing of material, and after the raw materials roll forming, through throwing ball processing, can get rid of coil of strip surface scale, improve appearance quality, strengthen the coil of strip surface simultaneously.
2. The surface of the steel coil is cleaned to improve the adhesion of subsequent coatings, and a dispersion liquid formed by mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, a water glass aqueous solution, boron carbide and potassium fluoborate is sprayed on the surface of the steel coil to form a smooth and compact high-strength coating on the surface of the steel coil, so that the steel coil is further protected, wherein the polyimide in the dispersion liquid can improve the deposition rate of the coating and increase the bonding strength with stainless steel.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The corrosion-resistant high-strength stainless steel is characterized by comprising the following raw materials in percentage by weight: 0.90-1.50% of chromium, 0.70-1.20% of manganese, 0.20-0.65% of nitrogen, 0.20-0.30% of molybdenum, 0.13-0.40% of silicon, 0.08-0.14% of titanium, 0.007-0.025% of carbon, less than 0.10% of niobium, less than 0.04% of phosphorus, less than 0.04% of sulfur, less than 0.035% of copper, less than 0.015% of nickel, and the balance of iron and inevitable impurities.
2. The corrosion-resistant high-strength stainless steel according to claim 1, comprising the following raw materials in percentage by weight: 0.90% of chromium, 0.70% of manganese, 0.65% of nitrogen, 0.30% of molybdenum, 0.13% of silicon, 0.08% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
3. The corrosion-resistant high-strength stainless steel according to claim 1, comprising the following raw materials in percentage by weight: 1.50% of chromium, 1.20% of manganese, 0.20% of nitrogen, 0.20% of molybdenum, 0.40% of silicon, 0.14% of titanium, 0.025% of carbon, 0.8% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
4. The corrosion-resistant high-strength stainless steel according to claim 1, comprising the following raw materials in percentage by weight: 1.20% of chromium, 1.10% of manganese, 0.55% of nitrogen, 0.25% of molybdenum, 0.35% of silicon, 0.1% of titanium, 0.015% of carbon, 0.5% of niobium, 0.035% of phosphorus, 0.035% of sulfur, 0.02% of copper, 0.01% of nickel, and the balance of iron and inevitable impurities.
5. A preparation process of corrosion-resistant high-strength stainless steel is characterized by comprising the following steps:
1) smelting and continuous casting: firstly, according to the mixture ratio of 0.90-1.50% of chromium, 0.70-1.20% of manganese, 0.20-0.65% of nitrogen, 0.20-0.30% of molybdenum, 0.13-0.40% of silicon, 0.08-0.14% of titanium, 0.007-0.025% of carbon, 0.04% of phosphorus, 0.04% of sulfur, 0.035% of copper and the balance of iron and inevitable impurity components, smelting molten steel by an electric furnace, then adding 0.10% of niobium and 0.015% of nickel for further smelting, and then continuously casting the molten steel into a continuous casting blank;
2) hot rolling and annealing: feeding the continuous casting slab obtained in the step 1) into a heating furnace for heating, then removing surface oxide skin through rough rolling of a rough rolling mill set, then feeding the continuous casting slab into a finish rolling mill set for finish rolling, cooling a hot steel strip from the last rolling mill of the finish rolling to a set temperature through laminar flow, rolling the hot steel strip into a steel coil through a coiling machine, and then carrying out annealing and acid pickling treatment on the steel coil to remove an oxidized surface to obtain an annealed white skin coil;
3) cold rolling and annealing: the annealed white-skin coil obtained in the step 2) is processed by a cold continuous rolling unit to obtain a cold-rolled sheet, and then is processed by annealing and pickling to obtain a cold-rolled stainless steel coil;
4) shot blasting treatment: performing shot blasting treatment on the cold-rolled stainless steel coil obtained in the step 3) to obtain a reinforced steel coil;
5) cleaning treatment: placing the reinforced steel coil obtained in the step 4) into a cleaning agent, cleaning for 5-10min by utilizing 30kHz ultrasonic waves, then removing oil by adopting a chemical method, wherein the oil removing temperature is 70 ℃, the time is 15min, repeatedly cleaning and rinsing for 2-3 times, and drying the surface by using hot air or induction heating, wherein the drying temperature is less than 50 ℃;
6) spraying the paint: mixing nano aluminum powder, nano zinc powder, nano yttrium powder, polyimide, water glass aqueous solution, boron carbide and potassium fluoborate, forming stable dispersion liquid after ultrasonic treatment, uniformly spraying the obtained dispersion liquid on the surface of the cleaned reinforced steel coil obtained in the step 5) by using a spray gun with double nozzles, taking high-pressure air as carrier gas and taking inert gas as shielding gas, and finally forming the corrosion-resistant coating through curing and plasma oxidation treatment.
6. The process of making a corrosion-resistant, high strength stainless steel according to claim 5, wherein: the molten steel smelting process comprises three-step smelting of electric furnace steelmaking, AOD decarburization and VOD deoxidation, wherein electromagnetic stirring is adopted in the continuous casting process, the drawing speed of a continuous casting billet is 1-1.5m/min, the steel coil annealing temperature is 970-1000 ℃, ceramic shot-throwing bodies are adopted for the shot-throwing bodies, and the shot-throwing amount is 50 Kg/min.
7. The process of making a corrosion-resistant, high strength stainless steel according to claim 5, wherein: the nano aluminum powder, the nano zinc powder and the nano yttrium powder are ground by a ball mill before use, the curing temperature is 130-150 ℃, the curing time is 4-6h, and the plasma oxidation temperature is 600 ℃.
CN202110635437.2A 2021-06-08 2021-06-08 Corrosion-resistant high-strength stainless steel and preparation process thereof Pending CN113789479A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI813491B (en) * 2022-11-04 2023-08-21 中國鋼鐵股份有限公司 Corrosion resistant steel and method for producing the same
CN116875938A (en) * 2023-07-17 2023-10-13 淮安市淮宁钢结构有限公司 Corrosion-resistant composite steel plate and preparation process thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI813491B (en) * 2022-11-04 2023-08-21 中國鋼鐵股份有限公司 Corrosion resistant steel and method for producing the same
CN116875938A (en) * 2023-07-17 2023-10-13 淮安市淮宁钢结构有限公司 Corrosion-resistant composite steel plate and preparation process thereof

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