CN111155037A - Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering - Google Patents
Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
Abstract
The invention relates to a production method of a Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering, which comprises the following chemical components in percentage by mass: 0.05 to 0.15 percent of Nb, 0.005 to 0.015 percent of Cu, 0.008 to 0.02 percent of Cr, less than or equal to 0.02 percent of P, 0.1 to 0.27 percent of C, 0.15 to 0.35 percent of Si, 1.25 to 1.55 percent of Mn, less than or equal to 0.02 percent of S, 0.008 to 0.02 percent of Cr, and the balance of Fe and inevitable impurities; the invention ensures that the prepared steel sheet pile can meet the current requirements on ocean engineering, and simultaneously improves the strength, toughness and corrosion resistance of the steel sheet pile, reduces the abrasion degree, reduces the pollution and prolongs the service life of the steel sheet pile by adding corresponding composite elements.
Description
Technical Field
The invention relates to the technical field of steel sheet pile production, in particular to a production method of a Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering.
Background
The steel sheet pile is a section steel with lock catches, and can be divided into a hot-rolled/stretched steel sheet pile and a cold-bent steel sheet pile according to different processing and manufacturing processes, and is divided into a straight plate type, a groove type, a Z type and the like according to the cross section shape. The steel sheet pile is a steel material widely used for hydraulic engineering, ocean facility engineering and roadbed and bridge foundation engineering, can greatly reduce the use amount of earth, gravel and concrete in the construction process, very effectively protects environmental resources and has obvious environmental protection effect; in addition, the steel sheet pile has simple construction procedure, easy operation and short construction period, and can play an important role in projects with stronger timeliness, such as flood control, collapse and the like, so the steel sheet pile has very wide market potential and development prospect.
Chinese patent application with publication number CN110144526A discloses a production method of a hot-rolled steel sheet pile, wherein the steel for the steel sheet pile comprises the following chemical components, by mass, 0.21-0.50 wt% of C, less than or equal to 0.17 wt% of Si, 0.7-0.99 wt% of Mn, less than or equal to 0.030 wt% of P, less than or equal to 0.030 wt% of S, and the balance of Fe and inevitable impurities. The method adjusts the effective components in the molten steel, increases the consumption of carbon, reduces the consumption of the manganese-silicon-sulfur-phosphorus element, greatly reduces the production cost under the condition of not adding niobium-vanadium-titanium alloy, and ensures that the mechanical property of the hot-rolled steel sheet pile reaches the standard requirement.
The Chinese patent application No. 201710633851.3 discloses a hot-rolled U-shaped steel sheet pile and a forming method thereof, wherein the steel for the steel sheet pile comprises 0.1-0.25 wt% of chemical components C, 1.0-1.8 wt% of Mn, 0.4-0.6 wt% of Si, less than or equal to 0.02-0.15 wt% of Ni, 0.05-0.2 wt% of Cr, 0.001-0.01 wt% of Cu, 0.1-0.3 wt% of V, 0.01-0.1 wt% of Nb, 0.01-0.05 wt% of P, and the balance Fe. In the technical scheme, the steel sheet pile obtained by the aid of the Ni, the Cr and the Cu has good fresh water corrosion resistance, and excellent mechanical properties, particularly tensile strength of more than or equal to 590MPa, elongation of 30-35% and yield strength of more than or equal to 440 MPa.
The Chinese patent application with the application number of 201010147704 discloses a 'fresh water corrosion resistant hot-rolled U-shaped steel sheet pile', the chemical composition of steel for the steel sheet pile is as follows: 0.1 to 0.3 wt% of C, 0.8 to 1.8 wt% of Mn, 0.1 to 0.215 wt% of Si, 0.10 to 0.15 wt% of P, less than or equal to 0.02 wt% of S, 0.08 to 0.15 wt% of lanthanide, and the balance Fe. The hot-rolled U-shaped steel sheet pile has good fresh water corrosion resistance and good mechanical properties, and can meet the application requirements in general environments.
The service environment of the steel sheet pile for ocean engineering is complex and variable, and the steel sheet pile not only needs to bear the corrosion of seawater, but also needs to bear the interaction load action of flood, cofferdam and sea wave and the acting force of soil around the steel sheet pile, so that the steel sheet pile for ocean engineering needs to have the mechanical properties of seawater corrosion resistance and high strength so as to ensure the stability of the steel sheet pile in the deep-water high-flow-rate ocean, avoid the deformation and fracture of the steel sheet pile under the bad environmental climate in the ocean and improve the safety. In order to enable the steel sheet pile to work in a complicated and severe environment climate, the development of the high-strength seawater corrosion resistant steel sheet pile for ocean engineering is one of the key technical problems to be solved at present.
Disclosure of Invention
The invention provides a production method of a Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering, which can ensure that the prepared steel sheet pile can meet the current requirements on ocean engineering, and simultaneously improve the strength, toughness and corrosion resistance of the steel sheet pile, reduce the wear degree, reduce pollution and prolong the service life of the steel sheet pile by adding corresponding composite elements, thereby preparing the high-strength high-toughness corrosion resistant steel sheet pile which can adapt to the ocean engineering environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the production method of the Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for the engineering comprises the following chemical components in percentage by mass: 0.05 to 0.15 percent of Nb, 0.005 to 0.015 percent of Cu, 0.008 to 0.02 percent of Cr, less than or equal to 0.02 percent of P, 0.1 to 0.27 percent of C, 0.15 to 0.35 percent of Si, 1.25 to 1.55 percent of Mn, less than or equal to 0.02 percent of S, 0.008 to 0.02 percent of Cr0.008 to 0.02 percent of Fe and inevitable impurities; the production process of the steel sheet pile comprises the following steps:
1) smelting in a converter or an electric furnace; controlling the tapping temperature of smelting as follows: 1600-1650 ℃;
2) refining in a refining furnace; during refining in a refining furnace, the grain size of the control plate ingot is not more than 200 microns, and the steel is medium-solidThe maximum size of the bulk inclusions is not more than 2mm, the gas content in steel is not more than 0.1mL/100gFe, the corrosion point number of a plate ingot is not more than 3/mm2；
3) Continuous casting; controlling the pouring temperature to be 1570-1585 ℃, and adopting electromagnetic stirring all the time in the continuous casting process;
4) heating; heating the steel billet by a stepping heating furnace, wherein the first-stage heating temperature is 900-1200 ℃, the second-stage heating temperature is 1310-1330 ℃, and the soaking temperature is 1170-1190 ℃; the discharging temperature is 1200-1250 ℃;
5) descaling the steel billet discharged from the furnace by using high-pressure water;
6) rolling; the initial rolling temperature of the steel billet is 1100-1200 ℃; the finish rolling steel feeding temperature is more than or equal to 930 ℃, and the finish rolling steel tapping temperature is less than or equal to 850 ℃.
During refining of the refining furnace, the size of solid inclusions in steel is measured by adopting a scanning electron microscope, the gas content is measured by adopting water immersion type C-SCAN ultrasonic flaw detection, and the corrosion point number of a slab ingot is measured by adopting an electrochemical method.
The surface of the continuous casting billet cannot have visible reconnection, skinning, scabbing and inclusion defects, cracks with the depth of more than 3mm, scratches, indentations, scratches, air holes, wrinkles, splashes, bumps and pits with the depth or height of more than 2 mm; the cross section of the continuous casting billet cannot have shrinkage cavities, subcutaneous bubbles and cracks.
In the heating process, the temperature difference of the head, the middle and the tail of the steel billet is not more than 20 ℃, and the temperature difference of the same batch of steel billets is not more than 30 ℃; when the billet is taken out of the heating furnace, the temperature difference of the head, the middle and the tail of the billet is not more than 20 ℃, and the temperature difference of the billet in the same batch is not more than 100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1) the steel sheet pile is made of high-strength steel containing Nb, wherein the Nb is a strong carbon compound forming element and can preferentially form a strong carbon compound at high temperature; and Nb has obvious influence on the ferrite form, the fine structure and the form of a precipitation phase, the carbide of the niobium element is formed in austenite, the recrystallization of high-temperature deformation austenite is prevented, niobium carbide (nitride) is separated out in the subsequent phase transformation process to generate precipitation strengthening, and the added Nb element can improve the strength of the steel sheet pile while keeping the toughness of the steel sheet pile unchanged;
2) cu and P elements are added into chemical components of the steel sheet pile, and the copper can generate precipitation strengthening effect through proper heat treatment and can improve the hardenability of the steel and the electrode potential of a matrix, so that the wear resistance and the corrosion resistance of the steel are improved; phosphorus is a harmful element, but trace use of phosphorus can improve the corrosion resistance and stability of steel, so that the wear resistance of the steel sheet pile is enhanced, and the high-strength seawater corrosion resistant ocean engineering steel sheet pile is obtained;
3) the corrosion resistance of the steel sheet pile is enhanced by adding Cr element, and a layer of firm and compact chromium oxide can be formed on the surface of steel in an oxidizing medium by Cr, so that the steel sheet pile is protected; in addition, the chromium is melted into the steel, so that the electrode potential of the steel can be obviously improved, the chemical corrosion caused by different electrode potentials is reduced, the pitting potential E0 & gt-0.3V of the steel sheet pile is realized, and the corrosion resistance is good; the main effect of adding Cr is to improve the corrosion resistance of steel, the steel still keeps good corrosion resistance after being soaked in 5 percent NaCl solution for 50 days, and the corrosion point number of the steel sheet pile is not higher than 3/mm2；
4) Although the niobium, vanadium and titanium are added into the chemical components of the steel sheet pile, the production cost is increased, but the niobium, vanadium and titanium elements can be melted into steel to inhibit the growth of crystal grains, so that the crystal grains of the steel material are refined, and the strength and the toughness are improved; in addition, niobium, vanadium and titanium elements can generate nitrides to generate the effect of precipitation strengthening, so that the mechanical property of the hot-rolled steel sheet pile which can meet the service condition in the complex environment of ocean engineering is ensured.
Detailed Description
The invention relates to a production method of a Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering, which comprises the following chemical components in percentage by mass: 0.05 to 0.15 percent of Nb, 0.005 to 0.015 percent of Cu, 0.008 to 0.02 percent of Cr0.008 to 0.02 percent of P, less than or equal to 0.02 percent of C, 0.1 to 0.27 percent of Si, 1.15 to 0.35 percent of Mn, less than or equal to 0.02 percent of S, 0.008 to 0.02 percent of Cr, and the balance of Fe and inevitable impurities; the production process of the steel sheet pile comprises the following steps:
1) smelting in a converter or an electric furnace; controlling the tapping temperature of smelting as follows: 1600-1650 ℃;
2) refining in a refining furnace; during refining in a refining furnace, the grain size of the control plate ingot is not more than 200 microns, the size of solid inclusions in steel is not more than 2mm at most, the gas content in steel is not more than 0.1mL/100gFe, the corrosion point number of the plate ingot is not more than 3/mm2；
3) Continuous casting; controlling the pouring temperature to be 1570-1585 ℃, and adopting electromagnetic stirring all the time in the continuous casting process;
4) heating; heating the steel billet by a stepping heating furnace, wherein the first-stage heating temperature is 900-1200 ℃, the second-stage heating temperature is 1310-1330 ℃, and the soaking temperature is 1170-1190 ℃; the discharging temperature is 1200-1250 ℃;
5) descaling the steel billet discharged from the furnace by using high-pressure water;
6) rolling; the initial rolling temperature of the steel billet is 1100-1200 ℃; the finish rolling steel feeding temperature is more than or equal to 930 ℃, and the finish rolling steel tapping temperature is less than or equal to 850 ℃.
During refining of the refining furnace, the size of solid inclusions in steel is measured by adopting a scanning electron microscope, the gas content is measured by adopting water immersion type C-SCAN ultrasonic flaw detection, and the corrosion point number of a slab ingot is measured by adopting an electrochemical method.
The surface of the continuous casting billet cannot have visible reconnection, skinning, scabbing and inclusion defects, cracks with the depth of more than 3mm, scratches, indentations, scratches, air holes, wrinkles, splashes, bumps and pits with the depth or height of more than 2 mm; the cross section of the continuous casting billet cannot have shrinkage cavities, subcutaneous bubbles and cracks.
In the heating process, the temperature difference of the head, the middle and the tail of the steel billet is not more than 20 ℃, and the temperature difference of the same batch of steel billets is not more than 30 ℃; when the billet is taken out of the heating furnace, the temperature difference of the head, the middle and the tail of the billet is not more than 20 ℃, and the temperature difference of the billet in the same batch is not more than 100 ℃.
According to the steel sheet pile, micro-alloy elements such as Nb, V and Ti are added in the alloy smelting process, the effective components in molten steel are reasonably matched, and a steel sheet pile plate ingot is subjected to heat treatment, dephosphorization, rough rolling and finish rolling to obtain the high-strength and corrosion-resistant hot-rolled steel sheet pile.
Niobium-containing high-strength steel is selected as a raw material, and a niobium element is a strong carbon compound forming element, so that the strong carbon compound is preferentially formed at high temperature. And niobium has obvious influence on ferrite morphology, fine structure and precipitated phase morphology, the carbide of niobium element is formed in austenite, high temperature deformation austenite recrystallization is prevented, niobium carbide (nitride) is separated out in the subsequent phase transformation process to generate precipitation strengthening, and the toughness of the steel sheet pile is kept unchanged and the strength of the steel sheet pile is improved by adding the niobium element. Vanadium is an excellent deoxidizer of steel, and the addition of trace vanadium in the steel can refine structure grains and improve strength and toughness. The carbide formed by vanadium and carbon can improve the hydrogen corrosion resistance under high temperature and high pressure. Titanium is a strong deoxidizer in steel, and can make the internal structure of steel compact, refine grain strength, reduce ageing sensitivity and cold brittleness. The complete solid solution temperature of niobium is 1325-. When niobium and vanadium are added compositely, the strength of the steel can be improved, and the toughness can be improved. The yield strength of the steel sheet pile is more than or equal to 420MPa, the tensile strength is kept at 520-680 MPa, and the elongation is more than or equal to 20%.
The invention enhances the corrosion resistance of the steel sheet pile by adding Cr element, forms a layer of firm and compact chromium oxide on the surface of the steel in an oxidizing medium to protect the steel sheet pile, can obviously improve the electrode potential of the steel in addition to the chromium melted into the steel, reduces the chemical corrosion caused by different electrode potentials, improves the corrosion resistance of the steel sheet pile, keeps good corrosion resistance after being soaked in 5 percent NaCl solution for 50 days, and has the corrosion point number of the steel sheet pile not higher than 3/mm2The service life of the steel sheet pile is prolonged to 20-50 years, and the safety is improved.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the embodiment, the prepared hot-rolled steel sheet pile comprises the following chemical components in percentage by mass: 0.08 percent of Nb, 0.012 percent of Cu0.012 percent of Cr, less than or equal to 0.02 percent of P, 0.15 percent of C, 0.20 percent of Si, 1.30 percent of Mn, less than or equal to 0.02 percent of S, 0.008 to 0.02 percent of Cr, and the balance of Fe and inevitable impurities.
The production process of the steel sheet pile comprises the following steps:
1) smelting in a converter, and controlling the temperature of smelting tapping to be 1600-1630 ℃.
2) Refining in a refining furnace; controlling the grain size of the plate ingot to be not more than 200 microns, measuring the maximum size of solid inclusions by adopting a Scanning Electron Microscope (SEM) to be not more than 2mm, measuring the gas content by adopting a water immersion type C-SCAN ultrasonic flaw detection to be not more than 0.1mL/100gFe, preparing acid liquor by adopting a chemical method, counting and corroding conditions, and finally measuring the corrosion point number of the plate ingot to be not more than 3/mm2。
3) Continuous casting; controlling the pouring temperature to be 1570-1575 ℃, and carrying out electromagnetic stirring all the time in the continuous casting process;
4) the furnace is a walking beam type heating furnace with an upper heating mode and a lower heating mode, and the heating mode of the furnace is three-section heating. The heating temperature of the steel billet is controlled, the furnace temperature is stable, and the temperature difference of the steel billet along the length direction and the section is ensured to be small. When the rolling is standby, the furnace temperature is rapidly adjusted, and the billet in the furnace is ensured not to be overheated and overburning. The steel billet is uniformly heated according to the requirement, and the temperature difference of the head part, the middle part and the tail part of the steel billet is not more than 20 ℃ and the temperature difference of the same batch of steel billets is not more than 30 ℃ in general conditions. The temperature of the first heating section is 1000-1100 ℃, the temperature of the second heating section is 1310-1320 ℃, the temperature of the soaking section is 1180-1190 ℃, and the temperature of the furnace tail is not required. And steel tapping is granted only when the tapping temperature is met. Generally, the temperature difference of the head, the middle and the tail of the billet is not more than 20 ℃, and the temperature difference of the billet in the same batch is not more than 100 ℃. Under special conditions, the temperature exceeds the standard, the tapping speed is slowed down under the condition of not influencing the tolerance of equipment and finished products, the temperature is gradually increased for production, otherwise, the tapping is stopped, and the rolling is started after the temperature is increased. Tapping temperature: 1200-1220 ℃.
5) Removing phosphorus by using high-pressure water;
6) rough rolling, wherein the initial rolling temperature of a steel billet is as follows: 1100-1150 ℃. The roughing mill is a two-roll reversible mill, low-temperature steel, blackhead steel and burr steel are strictly forbidden to be bitten in the roughing process, and the influence on production caused by roll breakage and outlet guide and guard flushing in the rolling process is avoided.
7) Fine rolling to obtain a steel sheet pile finished product; the finish rolling steel feeding temperature is more than or equal to 930 ℃, and the finish rolling steel tapping temperature is less than or equal to 850 ℃.
The pitting potential E0 > -0.3V of the steel sheet pile prepared by the embodiment is good in corrosion resistance; the steel sheet pile still keeps good corrosion resistance after being soaked in 5 percent NaCl solution for 50 days, and the corrosion point number of the steel sheet pile is less than 3/mm2。
[ example 2 ]
In the embodiment, the prepared hot-rolled steel sheet pile comprises the following chemical components in percentage by mass: 0.1 percent of Nb, 0.011 percent of Cu0.011 percent of Cr, less than or equal to 0.02 percent of P, 0.25 percent of C, 0.20 percent of Si, 1.35 percent of Mn, less than or equal to 0.02 percent of S, and the balance of Fe and inevitable impurities.
The production process of the steel sheet pile comprises the following steps:
1) smelting in a converter, and controlling the smelting tapping temperature to be 1620-1650 ℃.
2) Refining in a refining furnace; the grain size of the control plate ingot is not more than 200 microns, the size of solid inclusions in steel is not more than 2mm at most, the gas content in the steel is not more than 0.1mL/100gFe, the corrosion point number of the plate ingot is not more than 3/mm2；
3) Continuous casting; controlling the pouring temperature to 1580-1585 ℃, and electromagnetically stirring all the time in the continuous casting process;
4) heating by using a stepping heating furnace, heating the continuous casting billet to 1250-1300 ℃, wherein the tapping temperature is as follows: 1230-1250 ℃.
5) Removing phosphorus by using high-pressure water;
6) rough rolling, wherein the initial rolling temperature of a steel billet is as follows: 1150-1200 ℃.
7) Fine rolling to obtain a steel sheet pile finished product; the finish rolling steel feeding temperature is more than or equal to 930 ℃, and the finish rolling steel tapping temperature is less than or equal to 850 ℃.
The pitting potential E0 > -0.3V of the steel sheet pile prepared by the embodiment is good in corrosion resistance; the steel sheet pile still keeps good corrosion resistance after being soaked in 5 percent NaCl solution for 50 days, and the corrosion point number of the steel sheet pile is less than 3/mm2。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The production method of the Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for the engineering is characterized in that the steel sheet pile comprises the following chemical components in percentage by mass: 0.05 to 0.15 percent of Nb, 0.005 to 0.015 percent of Cu, 0.008 to 0.02 percent of Cr, less than or equal to 0.02 percent of P, 0.1 to 0.27 percent of C, 0.15 to 0.35 percent of Si, 1.25 to 1.55 percent of Mn, less than or equal to 0.02 percent of S, 0.008 to 0.02 percent of Cr, and the balance of Fe and inevitable impurities; the production process of the steel sheet pile comprises the following steps:
1) smelting in a converter or an electric furnace; controlling the tapping temperature of smelting as follows: 1600-1650 ℃;
2) refining in a refining furnace; during refining in a refining furnace, the grain size of the control plate ingot is not more than 200 microns, the size of solid inclusions in steel is not more than 2mm at most, the gas content in steel is not more than 0.1mL/100gFe, the corrosion point number of the plate ingot is not more than 3/mm2；
3) Continuous casting; controlling the pouring temperature to be 1570-1585 ℃, and adopting electromagnetic stirring all the time in the continuous casting process;
4) heating; heating the steel billet by a stepping heating furnace, wherein the first-stage heating temperature is 900-1200 ℃, the second-stage heating temperature is 1310-1330 ℃, and the soaking temperature is 1170-1190 ℃; the discharging temperature is 1200-1250 ℃;
5) descaling the steel billet discharged from the furnace by using high-pressure water;
6) rolling; the initial rolling temperature of the steel billet is 1100-1200 ℃; the finish rolling steel feeding temperature is more than or equal to 930 ℃, and the finish rolling steel tapping temperature is less than or equal to 850 ℃.
2. The method for producing the Nb-containing microalloyed high-strength seawater corrosion resistant engineering steel sheet pile as claimed in claim 1, wherein the refining furnace is used for refining, a scanning electron microscope is used for measuring the size of solid inclusions in the steel, a water immersion type C-SCAN ultrasonic flaw detection is used for measuring the gas content, and the corrosion point number of a plate ingot is measured by an electrochemical method.
3. The method for producing a Nb-containing microalloyed high-strength seawater corrosion resistant engineering steel sheet pile as claimed in claim 1, wherein the continuous casting billet has no visible reconnection, skinning, scabing, inclusion defects, cracks with a depth of more than 3mm, scratches, indentations, gouges, pores, wrinkles, splashes, bumps, pits; the cross section of the continuous casting billet cannot have shrinkage cavities, subcutaneous bubbles and cracks.
4. The method for producing a Nb-containing microalloyed high-strength seawater corrosion resistant engineering steel sheet pile as claimed in claim 1, wherein the temperature difference of the head, the middle and the tail of the billet during heating is not more than 20 ℃, and the temperature difference of the billet in the same batch is not more than 30 ℃; when the billet is taken out of the heating furnace, the temperature difference of the head, the middle and the tail of the billet is not more than 20 ℃, and the temperature difference of the billet in the same batch is not more than 100 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010090561.0A CN111155037B (en) | 2020-02-13 | 2020-02-13 | Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering |
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| CN202010090561.0A CN111155037B (en) | 2020-02-13 | 2020-02-13 | Production method of Nb-containing microalloyed high-strength seawater corrosion resistant steel sheet pile for engineering |
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| CN111155037A true CN111155037A (en) | 2020-05-15 |
| CN111155037B CN111155037B (en) | 2021-06-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114107782A (en) * | 2021-11-18 | 2022-03-01 | 辽宁科技大学 | Method for improving yield strength stability of deformed steel bar HRB400E |
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| CN114107782B (en) * | 2021-11-18 | 2022-05-27 | 辽宁科技大学 | Method for improving yield strength stability of deformed steel bar HRB400E |
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