CN110669992B - Continuous casting billet for seawater corrosion resistant structural steel and production method thereof - Google Patents

Continuous casting billet for seawater corrosion resistant structural steel and production method thereof Download PDF

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CN110669992B
CN110669992B CN201910955197.7A CN201910955197A CN110669992B CN 110669992 B CN110669992 B CN 110669992B CN 201910955197 A CN201910955197 A CN 201910955197A CN 110669992 B CN110669992 B CN 110669992B
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邓建军
刘印子
李�杰
赵国昌
龙杰
林明新
张萌
刘生
谢东
程含文
李媛媛
张志勇
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Wuyang Iron and Steel Co Ltd
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract

The invention discloses a continuous casting billet for seawater corrosion resistant structural steel and a production method thereof, wherein the continuous casting billet comprises the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.15-0.40%, Mn: 1.00-1.60%, P is less than or equal to 0.005%, S is less than or equal to 0.003%, Ni is less than or equal to 0.40%, Cr is less than or equal to 0.60%, Alt: 0.020 to 0.040%, Nb: 0.020-0.030 percent of Cu, less than or equal to 0.10 percent of N, less than or equal to 0.0014 percent of N, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting. The continuous casting billet for the seawater corrosion resistant structural steel is a novel seawater corrosion resistant structural steel base metal, meets the production requirement of high-quality seawater corrosion resistant steel plates, has stable process and low cost, and can realize batch domestic production.

Description

Continuous casting billet for seawater corrosion resistant structural steel and production method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a continuous casting billet for seawater corrosion resistant structural steel and a production method thereof.
Background
The aggravation of world energy consumption and the exhaustion of energy are gradually highlighted in world competition, the development of traditional energy substitution modes, particularly the development of clean energy, becomes the blue sky of the development of new energy in the world, and nuclear energy, solar energy and wind energy power generation are used as main breakthrough of the new energy.
In order to increase the safety and environmental protection coefficient, the development of offshore mobile nuclear power and wind power generation belongs to a new research and development project, and in order to meet the requirement of offshore structural steel, high-quality continuous casting blank materials need to be developed. But the production process of continuous casting has more links and long casting time, so the source range of the inclusions is wide and the structure is more complex; the inclusion is difficult to float upwards from the liquid cavity of the crystallizer, and the continuity and the compactness of the steel matrix are damaged by the inclusion. The method is very beneficial to improving the quality of steel by researching and controlling the inclusion form of the continuous casting billet to produce the ultra-clean continuous casting billet, and is particularly urgent to the development of marine resources by developing the continuous casting billet for seawater corrosion resistant structural steel.
Based on the current domestic and foreign continuous casting billet production technology, the advantages of the existing continuous casting machine equipment and technology are accumulated, a large amount of market research and data demonstration are carried out by combining the current offshore project, the continuous casting billet technology for the seawater corrosion resistant structural steel is subjected to attack development, the high-quality grade offshore structural steel continuous casting billet is obtained by the innovation of the smelting process and the continuous casting process, the high-quality structural storage material for rolling the seawater corrosion resistant structural steel is completely provided, the quality grade is internationally advanced, and the method has important significance for the development of the seawater corrosion resistant structural steel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a continuous casting billet for seawater corrosion resistant structural steel and a production method thereof. The invention makes innovation on molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, improves the internal organization structure of the continuous casting billet, improves the quality technical index of the continuous casting billet, meets the requirements of producing a low-cost and high-quality seawater corrosion resistant structural steel plate by adopting a continuous casting billet mode, has stable process and can realize batch localization.
In order to solve the technical problems, the invention adopts the technical scheme that: the continuous casting billet for the seawater corrosion resistant structural steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.15-0.40%, Mn: 1.00-1.60%, P is less than or equal to 0.005%, S is less than or equal to 0.003%, Ni is less than or equal to 0.40%, Cr is less than or equal to 0.60%, Alt: 0.020 to 0.040%, Nb: 0.020-0.030 percent of Cu, less than or equal to 0.10 percent of N, less than or equal to 0.0014 percent of N, and the balance of Fe and inevitable impurities.
The low-power sulfur mark segregation of the continuous casting billet is 0-0.5, the grain size is 9.0-10.0 grade, the rectangular degree deviation is 0.0-1.5 degrees, the crack cleaning depth is 0-5 mm, and the quality of the continuous casting billet reaches the super-high-grade level.
The invention also provides a production method of the continuous casting billet for the seawater corrosion resistant structural steel, which comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline electric arc furnace, RH vacuum treatment and casting protection; the protective casting process comprises the steps of casting under the electromagnetic stirring condition, wherein the electric stirring current is 400-450A, the vibration frequency is 5-6.5 Hz, multipoint straightening is carried out on the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 3900-5600 m3The taper is 11.6-15.0, the drawing speed is 0.65-0.75 m/min, and the section of the continuous casting billet is 200-330 mm multiplied by 1500-2500 mm.
In the molten iron pretreatment process, the slag removing machine removes blast furnace slag in a molten iron bag, and the slag is sprayed into passivated magnesium alloy through a spray gun for desulfurization and dephosphorization to remove RE noble metal, wherein the content P in the pretreated molten iron is less than or equal to 0.003 percent and the content S in the pretreated molten iron is less than or equal to 0.003 percent.
In the converter steelmaking process, the added molten iron amount is more than or equal to 80 percent, the scrap steel amount is less than or equal to 20 percent, the planned amount of the total slag charge added while the oxygen is turned on in the first batch of slag charge is more than or equal to 3:2, and the residual slag charge is added after 10min of converting.
According to the smelting process of the alkaline electric arc furnace, the bulk density of furnace burden is 1.8-2.3, and the white slag alkalinity is CaO/SiO (calcium oxide/silicon dioxide) in percentage by mass2=4～5。
In the RH vacuum treatment process, the argon blowing flow is 400-500 m3And h, degassing in a vacuum circulation mode, keeping the vacuum degree at 66-70 Pa for 10-15 min, finely adjusting chemical components until the alloy components are subjected to internal control standard circulation, and controlling the temperature of the ladle at 1560-1580 ℃.
The seawater corrosion resistant structural steel continuous casting billet product standard refers to EN 10029-1991; the detection method of the continuous casting billet is based on the standard reference YB/T4003-2016.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the chemical composition design of the invention adopts low-carbon low alloy, ultralow phosphorus and ultralow sulfur content, thus ensuring the high purity and low segregation characteristics of continuous casting billets; ni is less than or equal to 0.40 percent, Cr is less than or equal to 0.60 percent, and the smelting cost is reduced. 2. The invention adopts the production process routes of molten iron pretreatment, converter steelmaking, smelting by an alkaline arc furnace, RH vacuum treatment and protective casting, and the obtained continuous casting billet for the seawater corrosion resistant structural steel has the advantages of low-power sulfur mark segregation of 0-0.5, grain size of 9.0-10.0 grade, rectangular degree deviation of 0.0-1.5 degrees and crack cleaning depth of 0-5 mm, thereby greatly improving the yield and ensuring that the quality of the continuous casting billet reaches the super-high-grade level. 3. The continuous casting billet for the seawater corrosion resistant structural steel is a novel seawater corrosion resistant structural steel base metal, meets the production requirement of high-quality seawater corrosion resistant steel plates, has stable process and low cost, and can realize batch domestic production.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 330mm multiplied by 2400mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.003%;
(2) a converter steelmaking process: adding 80% of iron water and 20% of scrap steel, adding 3:2 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.0, the white slag alkalinity mass percent is CaO/SiO2=4.5；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 420m3Performing vacuum cycle degassing at a vacuum degree of 66Pa for 10min, fine-adjusting chemical components until the alloy components enter an internal control standard cycle, and enabling the ladle temperature to be 1570 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 400A, the vibration frequency is 5.0Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 4500m3Taper of 11.6 and drawing speed of 0.70 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.005%, S: 0.003%; the internal tissue is compact: the low-power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.0 grade; the deviation of the rectangular degree is 1.5 degrees, the crack cleaning depth is 5mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 2
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 300mm multiplied by 2000mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.002%, S: 0.001 percent;
(2) a converter steelmaking process: adding 85% of iron water and 15% of scrap steel, adding 3:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.1, the white slag alkalinity mass percent is CaO/SiO2=4.3；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 450m3Performing vacuum cycle degassing, wherein the vacuum degree is 68Pa, the vacuum retention time is 11min, performing chemical component fine adjustment until the alloy components enter an internal control standard cycle, and the ladle temperature is 1580 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 420A, the vibration frequency is 5.5Hz, multipoint straightening is carried out on the bent part of the lower opening of the crystallizer, the bending distance is 2-3 m, and the water quantity of the crystallizer is 4200m3Taper of 11.8 and drawing speed of 0.72 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.004%, S: 0.003%; the internal tissue is compact: the low-power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.0 grade; the deviation of the rectangular degree is 1.2 degrees, the crack cleaning depth is 4mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 3
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 250mm multiplied by 2000mm, and the chemical component compositions and the mass percentage contents of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.002%;
(2) a converter steelmaking process: adding 85% of iron water and 15% of scrap steel, adding 3:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.1, the white slag alkalinity mass percent is CaO/SiO2=4.0；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 480m3Performing vacuum cycle degassing at a vacuum degree of 69Pa for 13min, fine-adjusting chemical components until the alloy components enter an internal control standard cycle, and at a ladle temperature of 1575 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 420A, the vibration frequency is 5.0Hz, multipoint straightening is carried out on the bent part of the lower opening of the crystallizer, the bent part is 2-3 m, and the water quantity of the crystallizer is 4300m3Taper of 12.1 and drawing speed of 0.70 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.005%, S: 0.001 percent; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.5 grade; the deviation of the rectangular degree is 1.0 degree, the crack cleaning depth is 5mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 4
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 250mm multiplied by 2400mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.002%, S: 0.002%;
(2) a converter steelmaking process: adding 86% of iron water and 14% of waste steel, adding 3:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.1, the white slag alkalinity mass percent is CaO/SiO2=4.0；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 430m3Performing vacuum cycle degassing at vacuum degree of 67Pa for 14min, fine-adjusting chemical components until the alloy components enter an internal control standard cycle, and controlling the ladle temperature to 1565 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 400A, the vibration frequency is 5.6Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 4300m314.2 of taper and 0.68m/min of drawing speed.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.001 percent; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.5 grade; the deviation of the rectangle degree is 1.4 degrees, the crack cleaning depth is 3mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 5
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 200mm multiplied by 2400mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.003%;
(2) a converter steelmaking process: adding 80% of iron water and 20% of scrap steel, adding 3:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.2, the white slag alkalinity mass percent is CaO/SiO2=4.6；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 470m3Performing vacuum cycle degassing at a vacuum degree of 69Pa for 12min, performing fine adjustment on chemical components until the alloy components enter an internal control standard cycle, and enabling the ladle temperature to be 1573 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 450A, the vibration frequency is 6.0Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 4600m313.8 of taper and 0.75m/min of drawing speed.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.002%; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.5 grade; the deviation of the rectangular degree is 1.5 degrees, the crack cleaning depth is 4mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 6
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 200mm multiplied by 2000mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.002%, S: 0.003%;
(2) a converter steelmaking process: adding 83% of iron water and 17% of scrap steel, adding 4:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.0, the white slag alkalinity mass percent is CaO/SiO2=4.5；
(4) RH vacuum treatment process: argon blowing, vacuum circulation and degassing are carried out,argon blowing flow rate of 430m3Performing vacuum cycle degassing, wherein the vacuum degree is 68Pa, the vacuum retention time is 13min, performing chemical component fine adjustment until the alloy components enter an internal control standard cycle, and the ladle temperature is 1580 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 420A, the vibration frequency is 5.5Hz, multipoint straightening is carried out at the bending part of 2-3 m of the lower opening of the crystallizer, and the water quantity of the crystallizer is 4900m3Taper of 11.7 and drawing speed of 0.72 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.001 percent; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0, and the grain size is 9.5 grade; the deviation of the rectangle degree is 1.2 degrees, the crack cleaning depth is 4.2mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 7
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 280mm multiplied by 2200mm, and the chemical component compositions and the mass percentage contents of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.003%;
(2) a converter steelmaking process: adding 85% of iron water and 15% of scrap steel, adding 3:2 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 1.9, the white slag alkalinity is CaO/SiO in percentage by mass2=4.7；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow of 460m3Performing vacuum cycle degassing at vacuum degree of 67Pa for 14min, and fine-adjusting chemical components until the alloy components are finished in an internal control standard cycle at a ladle temperature of 1568 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 400A, the vibration frequency is 5.0Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 4800m3Taper of 12.8 and drawing speed of 0.70 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.002%; the internal tissue is compact: the low-power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.0 grade; the deviation of the rectangular degree is 1.0 degree, the crack cleaning depth is 3.5mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 8
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 240mm multiplied by 2400mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.002%, S: 0.003%;
(2) a converter steelmaking process: adding 85% of iron water and 15% of scrap steel, adding 3:2 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.3, the white slag alkalinity mass percent is CaO/SiO2=4.7；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow rate of 470m3Performing vacuum cycle degassing at a vacuum degree of 69Pa for 13min, and finely adjusting chemical components until alloy components are finished in an internal control standard cycle at a ladle temperature of 1563 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 440A, the vibration frequency is 5.8Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 5200m3Taper and degree of taper13.8 and the pulling speed is 0.73 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.002%; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 9.5 grade; the deviation of the rectangle degree is 1.1 degrees, the crack cleaning depth is 3.5mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 9
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 220mm multiplied by 2000mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.001 percent;
(2) a converter steelmaking process: adding 85% of iron water and 15% of scrap steel, adding 3:2 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.2, the white slag alkalinity mass percent is CaO/SiO2=4.7；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow of 410m3Performing vacuum cycle degassing at a vacuum degree of 68Pa for 11min, fine-adjusting chemical components until the alloy components enter an internal control standard cycle, and enabling the ladle temperature to be 1577 ℃;
(5) a protective casting process: casting under the condition of electromagnetic stirring, wherein the electric stirring current is 425A, the vibration frequency is 6.3Hz, multipoint straightening is carried out at the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 5000m314.2 of taper and 0.75m/min of drawing speed.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.003%, S: 0.001 percent; the internal tissue is compact: the low-power sulfur mark segregation of the continuous casting billet is 0, and the grain size is 10 grades; the deviation of the rectangular degree is 0.5 degree, the crack cleaning depth is 3mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 10
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 200mm multiplied by 1500mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.002%, S: 0.001 percent;
(2) a converter steelmaking process: adding 88% of iron water and 12% of scrap steel, adding 2:1 of total slag charge while starting oxygen for first batch of slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 1.8, the white slag alkalinity is CaO/SiO in percentage by mass2=4.3；
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow of 400m3Performing vacuum cycle degassing at a vacuum degree of 70Pa for 10min, and finely adjusting chemical components until alloy components enter an internal control standard cycle and the temperature of a ladle is 1580 ℃;
(5) a protective casting process: casting under the conditions of electromagnetic stirring current 400A and vibration frequency 5.0Hz, and carrying out multipoint straightening at the bending part of 2-3 m of the lower opening of the crystallizer, wherein the water quantity of the crystallizer is 3900m3Taper of 12.7 and drawing speed of 0.65 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.004%, S: 0.002%; the internal tissue is compact: the low power sulfur mark segregation of the continuous casting billet is 0, and the grain size is 9.5 grade; the deviation of the rectangular degree is 0 degree, the crack cleaning depth is 2mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Example 11
The section of the continuous casting billet for the seawater corrosion resistant structural steel is 330mm multiplied by 2500mm, and the chemical component composition and the mass percentage content of the continuous casting billet are shown in table 1.
The production method of the continuous casting billet for the seawater corrosion resistant structural steel comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline arc furnace, RH vacuum treatment and protective casting, and comprises the following specific process steps:
(1) a molten iron pretreatment process: the slag removing machine removes blast furnace slag in the foundry ladle, sprays passivated magnesium alloy through a spray gun for desulfurization and dephosphorization, removes RE noble metal, and pre-treats the molten iron to obtain the molten iron with the content P: 0.003%, S: 0.002%;
(2) a converter steelmaking process: adding 90% of iron water and 10% of scrap steel, adding 5:1 of total slag charge while starting oxygen for first batch slag charge, and adding the rest slag charge after blowing for 10 min;
(3) an alkaline electric arc furnace smelting process: the bulk density of furnace burden is 2.3, and the mass percent of white slag alkalinity is CaO/SiO = 5.0;
(4) RH vacuum treatment process: argon blowing vacuum circulation degassing with argon blowing flow of 500m3Performing vacuum cycle degassing at a vacuum degree of 66Pa for 15min, and finely adjusting chemical components until alloy components are finished in an internal control standard cycle at a ladle temperature of 1560 ℃;
(5) a protective casting process: casting under the conditions of electromagnetic stirring current 450A and vibration frequency 6.5Hz, and performing multipoint straightening at the bending part of 2-3 m of the lower opening of the crystallizer, wherein the water amount of the crystallizer is 5600m3Taper of 15 and drawing speed of 0.75 m/min.
The structure purity of the continuous casting billet for the seawater corrosion resistant structural steel is high: p: 0.005%, S: 0.003%; the internal tissue is compact: the low-power sulfur mark segregation of the continuous casting billet is 0.5, and the grain size is 10 grades; the deviation of the rectangular degree is 1.0 degree, the crack cleaning depth is 0mm, and the quality of the continuous casting billet reaches the super-high-grade level.
Examples 1-11 seawater Corrosion resistant continuous casting slab for structural Steel, chemical composition and mass% thereof
Figure DEST_PATH_IMAGE002
The balance of the ingredients in table 1 are Fe and inevitable impurity elements.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (4)

1. The continuous casting billet for the seawater corrosion resistant structural steel is characterized by comprising the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.15-0.40%, Mn: 1.00-1.60%, P is less than or equal to 0.005%, S is less than or equal to 0.003%, Ni is less than or equal to 0.40%, Cr is less than or equal to 0.60%, Alt: 0.020 to 0.040%, Nb: 0.020-0.030 percent of Cu, less than or equal to 0.10 percent of N, less than or equal to 0.0014 percent of N, and the balance of Fe and inevitable impurities;
the low-power sulfur mark segregation of the continuous casting billet is 0-0.5, the grain size is 9.0-10.0 grade, the rectangular degree deviation is 0.0-1.5 degrees, and the crack cleaning depth is 0-5 mm;
the continuous casting billet for the seawater corrosion resistant structural steel is produced by the following method: comprises the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline electric arc furnace, RH vacuum treatment and protective casting; the protective casting process comprises the steps of casting under the electromagnetic stirring condition, wherein the electric stirring current is 400-450A, the vibration frequency is 5-6.5 Hz, multipoint straightening is carried out on the bending part of the lower opening of the crystallizer, the bending part is 2-3 m, and the water quantity of the crystallizer is 3900-5600 m3The taper is 11.6-15.0, the drawing speed is 0.65-0.75 m/min, and the section of the continuous casting billet is 200-330 mm multiplied by 1500-2500 mm;
in the smelting process of the alkaline electric arc furnace, the bulk density of furnace burden is 1.8-2.3, and the mass percentage of white slag alkalinity is CaO/SiO2=4～5。
2. The production method of the continuous casting billet for the seawater corrosion resistant structural steel, which is based on the claim 1, is characterized by comprising the working procedures of molten iron pretreatment, converter steelmaking, smelting in an alkaline electric arc furnace, RH vacuum treatment and protective casting; the protective casting process is as followsCasting under the condition of electromagnetic stirring, wherein the electric stirring current is 400-450A, the vibration frequency is 5-6.5 Hz, multipoint straightening is carried out on the bent part of the lower opening of the crystallizer, the bent part is 2-3 m, and the water quantity of the crystallizer is 3900-5600 m3The taper is 11.6-15.0, the drawing speed is 0.65-0.75 m/min, and the section of the continuous casting billet is 200-330 mm multiplied by 1500-2500 mm;
in the smelting process of the alkaline electric arc furnace, the bulk density of furnace burden is 1.8-2.3, and the mass percentage of white slag alkalinity is CaO/SiO2=4～5。
3. The method for producing the continuous casting billet for the seawater corrosion resistant structural steel as claimed in claim 2, wherein in the converter steelmaking process, the amount of added molten iron is more than or equal to 80%, the amount of scrap steel is less than or equal to 20%, the planned amount of added total slag charge is more than or equal to 3:2 when the first batch of slag charge is subjected to oxygen opening, and the rest slag charge is added after 10min of blowing.
4. The production method of the continuous casting slab for the seawater corrosion resistant structural steel as claimed in claim 2 or 3, wherein in the RH vacuum treatment process, the argon blowing flow is 400-500 m3And h, degassing in a vacuum circulation mode, keeping the vacuum degree at 66-70 Pa for 10-15 min, finely adjusting chemical components until the alloy components are subjected to internal control standard circulation, and controlling the temperature of the ladle at 1560-1580 ℃.
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