CN112647022A - High-silicon stainless steel pipe and preparation process thereof - Google Patents

High-silicon stainless steel pipe and preparation process thereof Download PDF

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Publication number
CN112647022A
CN112647022A CN202011557081.7A CN202011557081A CN112647022A CN 112647022 A CN112647022 A CN 112647022A CN 202011557081 A CN202011557081 A CN 202011557081A CN 112647022 A CN112647022 A CN 112647022A
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equal
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stainless steel
temperature
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王树平
华大凤
华鹏
刘威
陈杰
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Jiangsu Xinhe Alloy Technology Co ltd
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Jiangsu Xinhe Alloy Technology Co ltd
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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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • 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
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides a high-silicon stainless steel pipe, which comprises the following elements in percentage by weight: less than or equal to 0.03 percent of C, 4.5 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 18.0 to 20.0 percent of Ni, 17.0 to 19.0 percent of Cr, 0.30 to 0.80 percent of Mo, 1.50 to 2.50 percent of Cu, and the balance of Fe and inevitable impurities. The invention also provides a preparation process of the high-silicon stainless steel pipe, which comprises the following steps: preparing raw materials, vacuum smelting, electroslag remelting, forging, machining, manufacturing tubes and cold rolling the tubes. The invention has reasonable process design, optimized mixture ratio of the components of the raw materials and high yield, and the prepared high-silicon stainless steel pipe has better cold and hot processing performance and corrosion resistance, can be better suitable for the field of chemical industry, and is especially applied to a vacuum filter, a filter press and a sulfuric acid device.

Description

High-silicon stainless steel pipe and preparation process thereof
Technical Field
The invention relates to the field of corrosion-resistant alloy materials, in particular to a high-silicon stainless steel pipe and a preparation process thereof.
Background
In the 80 s of the 20 th century, China begins to develop corrosion-resistant high-silicon stainless steel, develops rapidly in recent decades, and is widely applied to the field of chemical industry, particularly strong acid devices with strong corrosivity.
Of course, as the silicon content increases, the high silicon stainless steel has poorer and poorer processability, so that the high silicon stainless steel pipe with excellent corrosion resistance and excellent processability has complex process and higher production cost.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a high-silicon stainless steel pipe and a preparation process thereof, which are used for solving the problems of complex process and high production cost of the high-silicon stainless steel pipe with high performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-silicon stainless steel pipe, which comprises the following elements in percentage by weight: less than or equal to 0.03 percent of C, 4.5 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 18.0 to 20.0 percent of Ni, 17.0 to 19.0 percent of Cr, 0.30 to 0.80 percent of Mo, 1.50 to 2.50 percent of Cu, and the balance of Fe and inevitable impurities.
Preferably, the weight percentages of the elements are as follows: less than or equal to 0.02 percent of C, 5.0 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 19.0 to 20.0 percent of Ni, 17.0 to 18.0 percent of Cr, 0.30 to 0.60 percent of Mo, 1.50 to 2.20 percent of Cu, and the balance of Fe and inevitable impurities.
The invention also provides a preparation process of the high-silicon stainless steel pipe, which comprises the following steps:
preparing S1 raw material: all the materials are required to meet the vacuum quality requirement, the materials are polished when returned to the surface of the same steel grade, the addition amount of each element is strictly controlled, the addition amount is less than or equal to 20 percent, and the materials are used after being baked according to the system.
S2 vacuum smelting: the vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in the melting period is less than 8Pa, the vacuum degree in the refining period is less than or equal to 8Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1540 ℃ for 1-2 minutes, the steel temperature is lowered to 1480 ℃ (in a steel-forming film punching state), the refining time is more than or equal to 25 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg of electrodes are poured, feeding in the later period of pouring is sufficient, and marks are broken after the pouring is.
S3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 55-60V, smelting current: 5000-6000A.
S4 forging: the heating temperature is 1140-. And S5 machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar.
S6 pipe making: heating to 1140-1170 ℃, preserving heat for 40 minutes, penetrating and rolling the pipe blank with the specification of phi 90X 8L, and pickling after heat treatment. S7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and (3) performing heat treatment on the cold-rolled or cold-drawn pipe to the temperature of 1150-1180 ℃ before the finished product is finished, and precisely rolling the finished product.
Preferably, the raw materials in the S2 vacuum smelting process are charged in the order that the small nickel plate is added to the bottom of about 1/4 percent, the bottom carbon is added to 0.030 percent, Mo and Cr are placed at the middle upper part of the crucible, and the upper Ni plate is covered.
Compared with the prior art, the invention has the beneficial effects that: by adopting the efficient and short-flow seamless tube production process, the high-silicon stainless steel tube with high yield and corrosion rate less than or equal to 0.07mm/year is successfully prepared, the raw material cost is greatly saved and the market competitiveness of the product is improved by optimizing the material proportion and using the return material.
Drawings
Fig. 1 is a flow chart of a preparation process of a high silicon stainless steel pipe of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-silicon stainless steel pipe, which comprises the following elements in percentage by weight: less than or equal to 0.03 percent of C, 4.5 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 18.0 to 20.0 percent of Ni, 17.0 to 19.0 percent of Cr, 0.30 to 0.80 percent of Mo, 1.50 to 2.50 percent of Cu, and the balance of Fe and inevitable impurities.
Preferably, the weight percentages of the elements are as follows: less than or equal to 0.02 percent of C, 5.0 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 19.0 to 20.0 percent of Ni, 17.0 to 18.0 percent of Cr, 0.30 to 0.60 percent of Mo, 1.50 to 2.20 percent of Cu, and the balance of Fe and inevitable impurities.
The elements in the high-silicon stainless steel pipe material have the following functions:
c, in order to ensure excellent mechanical property and corrosion resistance, particularly cold working property, the high-silicon austenitic stainless steel strictly controls the carbon content in the alloy, and the carbon content is controlled to be not more than 0.03 percent.
Si, a silicon element, can be deoxidized to form SiO2The invention improves the corrosion resistance of stainless steel, and the silicon content is designed to be 4.5-6.0%.
Mn is an austenite forming element and has the function of strongly stabilizing the austenite matrix of the stainless steel, so that the manganese content is controlled to be not more than 1.0 percent.
P, S, two fatal but unavoidable harmful elements which are difficult to dissolve in the alloy, can generate low melting point and eutectic compounds with nickel and chromium, and are precipitated from grain boundaries and gathered on the grain boundaries as the alloy solidifies, so that the grain boundaries become brittle. Therefore, the contents thereof are set at P: less than or equal to 0.025 percent. S: less than or equal to 0.010 percent.
Ni is a main alloy element of high-silicon stainless steel with an austenitic structure, and simultaneously improves the corrosion resistance of the stainless steel. The invention designs the nickel content to be 18.0-20.0% to ensure stable austenite structure.
Cr is the most main alloy element with corrosion resistance of high-silicon stainless steel, and in an oxidizing medium, Cr can quickly generate chromium oxide (such as Cr)2O3) The passivation film of (3) improves the corrosion resistance of the stainless steel. Since chromium is a main corrosion-resistant element in stainless steel, the present invention designs the chromium content to be 17.0-19.0% considering that chromium is a ferrite-forming element.
The invention contains molybdenum element, the molybdenum is added to improve the corrosion resistance of the steel, especially the performance of pitting corrosion resistance, crevice corrosion resistance and the like, the molybdenum is added to improve the corrosion resistance by the synergistic action of the molybdenum element and chromium and other elements, but considering that the molybdenum is a ferrite forming element, the molybdenum content of the invention is controlled to be 1.50-2.50%.
The invention contains copper element, copper is weaker austenite element and can properly improve corrosion resistance, the corrosion resistance of the stainless steel can be improved by cooperating with molybdenum element, a small amount of copper element can also improve the cold forming performance of the stainless steel, copper can form solid solution with nickel in the nickel-containing austenite stainless steel, and the copper content is controlled to be 1.50-2.50% comprehensively.
The invention also provides a preparation process of the high-silicon stainless steel pipe, which comprises the following steps:
preparing S1 raw material: all the materials are required to meet the vacuum quality requirement, the materials are polished when returned to the surface of the same steel grade, the addition amount of each element is strictly controlled, the addition amount is less than or equal to 20 percent, and the materials are used after being baked according to the system.
S2 vacuum smelting: the vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in the melting period is less than 8Pa, the vacuum degree in the refining period is less than or equal to 8Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1540 ℃ for 1-2 minutes, the steel temperature is lowered to 1480 ℃ (in a steel-forming film punching state), the refining time is more than or equal to 25 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg of electrodes are poured, feeding in the later period of pouring is sufficient, and marks are broken after the pouring is. Preferably, the charging sequence of the raw materials is that small nickel plates are added at the bottom of about 1/4 percent, bottom carbon is added at 0.030 percent, Mo and Cr are placed at the middle upper part of the crucible, and an upper Ni plate is covered.
S3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 55-60V, smelting current: 5000-6000A.
S4 forging: the heating temperature is 1140-. And S5 machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar.
S6 pipe making: heating to 1140-1170 ℃, preserving heat for 40 minutes, penetrating and rolling the pipe blank with the specification of phi 90X 8L, and pickling after heat treatment. S7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and (3) performing heat treatment on the cold-rolled or cold-drawn pipe to the temperature of 1150-1180 ℃ before the finished product is finished, and precisely rolling the finished product.
According to the preparation process of the high-silicon stainless steel pipe, the operation sequence and the process parameters of each step are optimally designed by adopting a vacuum smelting and electroslag remelting duplex smelting method, so that the purity of the high-silicon stainless steel pipe can be improved, impurity inclusion is reduced, sufficient degassing and uniform metallographic structure and chemical components are ensured, and the corrosion resistance and the processability of the high-silicon stainless steel are improved.
Example 1:
in the high-silicon stainless steel pipe material of embodiment 1 of the present invention, the weight percentages of the elements are as follows: 0.03 percent of C, 6.0 percent of Si, 1.0 percent of Mn, 0.015 percent of P, 0.010 percent of S, 20.0 percent of Ni, 18.0 percent of Cr, 0.70 percent of Mo, 2.50 percent of Cu, and the balance of Fe and inevitable impurities.
The preparation process of the high-silicon stainless steel pipe material of the embodiment is as follows:
preparing S1 raw material: all the materials are required to meet the vacuum quality requirement, the materials are polished when returned to the surface of the same steel grade, the addition amount of each element is strictly controlled, the addition amount is less than or equal to 20 percent, and the materials are used after being baked according to the system.
S2 vacuum smelting: the raw material charging sequence is that a small nickel plate is added with 1/4 at the bottom, 0.030% of bottom carbon is added, Mo and Cr are placed at the middle upper part of a crucible, an upper Ni plate is covered, vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in a melting period is less than 8Pa, the vacuum degree in a refining period is less than or equal to 8Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-term refining are adopted, the steel temperature is increased to 1540 ℃ for 1-2 minutes, the steel temperature is reduced to 1480 ℃ (a steel conjunctiva punching state), the refining time is 30 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg of electrodes are poured, after the post-pouring feeding is full, and marks are broken.
S3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 55V, smelting current: 5000.
s4 forging: heating at 1140 deg.c and heating rate of 280 deg.c/h for 50 min, lightly chamfering before forging, heavy hammer forging, re-forging after remelting to 1150 deg.c and maintaining for 45 min to forge phi 90 rod. And S5 machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar.
S6 pipe making: heating to 1150 deg.c, maintaining for 40 min, rolling pipe blank of phi 90X 8L, heat treating and acid washing. S7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and (4) carrying out heat treatment on the cold-rolled or cold-drawn pipe at 1160 ℃ until the pipe is finished, and precisely rolling the finished product.
Example 2:
in the high-silicon stainless steel pipe material of embodiment 2 of the present invention, the weight percentages of the elements are as follows: 0.02% of C, 5.0% of Si, 1.0% of Mn, 0.015% of P, 0.010% of S, 19.0% of Ni, 17.0% of Cr, 0.60% of Mo, 2.0% of Cu, and the balance of Fe and inevitable impurities.
The preparation process of the high-silicon stainless steel pipe material of the embodiment is as follows:
preparing S1 raw material: all the materials are required to meet the vacuum quality requirement, the materials are polished when returned to the surface of the same steel grade, the addition amount of each element is strictly controlled, the addition amount is less than or equal to 20 percent, and the materials are used after being baked according to the system.
S2 vacuum smelting: the raw material charging sequence is that a small nickel plate is added with 1/4 at the bottom, 0.030% of bottom carbon is added, Mo and Cr are placed at the middle upper part of a crucible, an upper Ni plate is covered, vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in a melting period is 7Pa, the vacuum degree in a refining period is 7Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1540 ℃ for 1-2 minutes, the steel temperature is lowered to 1480 ℃ (a steel film punching state), the refining time is 28 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg electrodes are poured, after-casting feeding is sufficient, and marks are broken after casting is completed for 10 minutes.
S3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 58V, smelting current: 5500A.
S4 forging: heating temperature 1160 ℃, heating rate 300 ℃/h in the heating process, preserving heat for 40 minutes, lightly chamfering before forging, then forging by a heavy hammer, returning to the furnace and heating to 1150 ℃, preserving heat for 45 minutes, then forging, and forging the phi 90 bar. And S5 machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar.
S6 pipe making: heating to 1160 deg.C, holding for 40 min, rolling to obtain tube blank with specification of phi 90X 8L, heat treating, and acid washing.
S7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and (4) carrying out heat treatment on the cold-rolled or cold-drawn pipe at 1160 ℃ until the pipe is finished, and precisely rolling the finished product.
Example 3:
in the high-silicon stainless steel pipe material of embodiment 3 of the present invention, the weight percentages of the elements are as follows: 0.02% of C, 5.5% of Si, 0.8% of Mn, 0.010% of P, 0.010% of S, 20.0% of Ni, 18.0% of Cr, 0.5% of Mo, 1.50% of Cu, and the balance of Fe and inevitable impurities.
The preparation process of the high-silicon stainless steel pipe material of the embodiment is as follows:
preparing S1 raw material: all the materials are required to meet the vacuum quality requirement, the materials are polished when returned to the surface of the same steel grade, the addition amount of each element is strictly controlled, the addition amount is less than or equal to 20 percent, and the materials are used after being baked according to the system.
S2 vacuum smelting: the raw material charging sequence is that a small nickel plate is added with 1/4 at the bottom, 0.030% of bottom carbon is added, Mo and Cr are placed at the middle upper part of a crucible, an upper Ni plate is covered, vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in a melting period is 7Pa, the vacuum degree in a refining period is 88Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1540 ℃ for 1-2 minutes, the steel temperature is lowered to 1480 ℃ (a steel film punching state), the refining time is 25 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg electrodes are poured, after-casting feeding is sufficient, and marks are broken after casting is completed for 10 minutes.
S3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 60V, smelting current: 6000A.
S4 forging: the heating temperature is 1140-. And S5 machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar.
S6 pipe making: heating at 1170 ℃, preserving the heat for 40 minutes, penetrating and rolling the pipe blank with the specification of phi 90X 8L, and pickling after heat treatment.
S7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and 1180 ℃, performing heat treatment on the cold-rolled or cold-drawn pipe until the finished product is obtained, and precisely rolling the finished product.
In conclusion, the invention provides the high-silicon stainless steel pipe and the preparation process thereof, the alloy components are optimally designed, so that the alloy has better corrosion resistance and excellent processing performance, and the return material is used, thereby greatly saving the raw material cost and improving the market competitiveness of the product; by adopting the efficient and short-flow seamless tube production process, the high-silicon stainless steel tube with high yield and corrosion rate of less than or equal to 0.07mm/year is successfully prepared, and the vacuum smelting and electroslag remelting duplex smelting method is adopted, so that the alloy purity is improved, impurity impurities are reduced, sufficient degassing is ensured, and the metallographic structure and the chemical components are uniform.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims (4)

1. A high silicon stainless steel pipe is characterized in that: the weight percentages of the elements are as follows: less than or equal to 0.03 percent of C, 4.5 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, 18.0 to 20.0 percent of Ni, 17.0 to 19.0 percent of Cr, 0.30 to 0.80 percent of Mo, 1.50 to 2.50 percent of Cu, and the balance of Fe and inevitable impurities.
2. The high silicon stainless steel tubing of claim 1, wherein: the weight percentages of the elements are as follows: less than or equal to 0.02 percent of C, 5.0 to 6.0 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 19.0 to 20.0 percent of Ni, 17.0 to 18.0 percent of Cr, 0.30 to 0.60 percent of Mo, 1.50 to 2.20 percent of Cu, and the balance of Fe and inevitable impurities.
3. The process for preparing a high silicon stainless steel tubing according to any one of claims 1-2, comprising the steps of:
preparing S1 raw material: all the materials meet the quality requirement, the blending amount of the returned surface polishing treatment of the same steel grade is less than or equal to 20 percent, the blending amount of each element is strictly controlled by the blending, and the materials are used after being baked according to a system;
s2 vacuum smelting: vacuum smelting is carried out according to a welding wire smelting process, the vacuum degree in a melting period is less than 8Pa, the vacuum degree in a refining period is less than or equal to 8Pa, at least two times of high-temperature instantaneous refining and one time of low-temperature long-time refining are adopted, the steel temperature is raised to 1540 ℃ for 1-2 minutes, the steel temperature is lowered to 1480 ℃ (in a steel-forming film punching state), the refining time is more than or equal to 25 minutes, the refining temperature is 1480 ℃, the tapping temperature is 1520 ℃, 200Kg of electrodes are poured, feeding is full in the later pouring period, and marks are broken after the pouring is completed for;
s3 electroslag remelting: cutting shrinkage cavity, grinding surface oxide to remove impurities, wherein the used slag is as follows: CaF2：AL2O3: CaO = 75: 20: 5, voltage: 55-60V, smelting current: 5000-6000A;
s4 forging: heating at 1140-;
s5, machining, namely, polishing the surface of the bar to remove oxide skin, and sizing L800-1200 mm/bar;
s6 pipe making: heating to 1140-1170 ℃, preserving heat for 40 minutes, penetrating and rolling the pipe blank with the specification of phi 90X 8L, and pickling after heat treatment;
s7 cold rolling of the tube: the surface of the pipe is inspected, polished and subjected to defect removal and end crack removal, and the annealing heat treatment temperature is as follows: and (3) performing heat treatment on the cold-rolled or cold-drawn pipe to the temperature of 1150-1180 ℃ before the finished product is finished, and precisely rolling the finished product.
4. The process for preparing a high-silicon stainless steel pipe as claimed in claim 3, wherein: the raw material charging sequence in the S2 vacuum smelting process is that a small nickel plate is added to the bottom of about 1/4 percent, bottom carbon is added to 0.030 percent, Mo and Cr are placed at the middle upper part of a crucible, and the upper part of the crucible is covered by a Ni plate.
CN202011557081.7A 2020-12-25 2020-12-25 High-silicon stainless steel pipe and preparation process thereof Pending CN112647022A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115896647A (en) * 2022-11-16 2023-04-04 江苏新华合金有限公司 Manufacturing process method of heat-resistant steel seamless pipe blank material for atmosphere protection annealing furnace
CN116240429A (en) * 2021-12-07 2023-06-09 江苏新华合金有限公司 Manufacturing process of zirconium-containing ferrotitanium-chromium-aluminum alloy material

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JPH07188752A (en) * 1993-12-28 1995-07-25 Kawasaki Steel Corp Production of nonoriented silicon steel sheet remarkably reduced in iron loss and excellent in low magnetic field property
US20160247613A1 (en) * 2014-09-28 2016-08-25 Northeastern University A preparation method of oriented high silicon steel
CN108085597A (en) * 2017-12-25 2018-05-29 永兴特种不锈钢股份有限公司 A kind of austenitic stainless steel of high temperature resistant high-concentration sulfuric acid
CN111850403A (en) * 2020-07-09 2020-10-30 江苏银环精密钢管有限公司 Stainless steel cladding tube for lead alloy liquid metal cooling fast reactor and manufacturing method

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JPH07188752A (en) * 1993-12-28 1995-07-25 Kawasaki Steel Corp Production of nonoriented silicon steel sheet remarkably reduced in iron loss and excellent in low magnetic field property
US20160247613A1 (en) * 2014-09-28 2016-08-25 Northeastern University A preparation method of oriented high silicon steel
CN108085597A (en) * 2017-12-25 2018-05-29 永兴特种不锈钢股份有限公司 A kind of austenitic stainless steel of high temperature resistant high-concentration sulfuric acid
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CN116240429A (en) * 2021-12-07 2023-06-09 江苏新华合金有限公司 Manufacturing process of zirconium-containing ferrotitanium-chromium-aluminum alloy material
CN115896647A (en) * 2022-11-16 2023-04-04 江苏新华合金有限公司 Manufacturing process method of heat-resistant steel seamless pipe blank material for atmosphere protection annealing furnace

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Application publication date: 20210413