CN-117385263-B - Stainless steel wire rod for glass sealing high-chromium ferrite and manufacturing method

CN117385263BCN 117385263 BCN117385263 BCN 117385263BCN-117385263-B

Abstract

The invention relates to the technical field of metal smelting, in particular to a stainless steel wire rod for glass sealing high-chromium ferrite, which comprises C≤0.030%、Cr:27.20~27.80%、Ni:1.10~1.50%、Cu≤0.20%、Nb：0.10~0.20%、Mn:0.40~0.70%、Si:0.20~0.50%、P:0.010~0.020%、S≤0.005%、N≤0.040%, mass percent of Fe and unavoidable impurities. The preparation method of the stainless steel wire rod comprises the steps of sequentially carrying out electric arc furnace smelting, AOD smelting, LF smelting, continuous casting, hot rolling and solid solution treatment on raw materials to finally prepare a stainless steel wire rod finished product. Through optimizing the stainless steel component design and the production process conditions, the material has good surface quality, excellent plastic toughness, finer grain size, reasonable thermal expansion coefficient, simple manufacturing flow and mass production.

Inventors

ZHANG WEINAN
LIU YANJUN
LUO BIN

Assignees

浙江青山钢铁有限公司
浙江瑞浦科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230515

Claims (5)

1. A manufacturing method of a high-chromium ferrite stainless steel wire rod for glass sealing is characterized by comprising the steps of sequentially carrying out electric arc furnace smelting, AOD smelting, LF smelting, continuous casting, hot-feed rolling and solid solution treatment on raw materials to finally obtain a stainless steel wire rod finished product, In the electric arc furnace smelting process, controlling the Si content of tapping to be 0.2-0.7%, the P content to be less than or equal to 0.015%, and controlling the tapping temperature to be 50-100 ℃ of liquidus temperature; the method comprises the steps of argon blowing in the whole process, controlling the content of C to be less than or equal to 0.020 percent, and controlling the tapping temperature to be less than or equal to 1700 ℃, wherein the AOD smelting process comprises a steel melting period, a decarburization period, a reduction period and a refining period, wherein cold lime is firstly added in the steel melting period, ferrochrome is added, raw molten steel of an electric arc furnace is added, oxygen is fed and the temperature is raised, the decarburization period is controlled to be more than 1650 ℃ and the content of C is ensured by a mode of oxygen blowing decarburization and chromium retention, ferrosilicon, a proper amount of lime and fluorite are added in the reduction period, slag skimming is carried out after stirring, lime and fluorite are added in the refining period, ferrochrome and electrolytic manganese are added according to sampling spectral components for component fine adjustment, and the tapping temperature is controlled; in the LF smelting process, firstly adding ferrochrome, electrolytic manganese and ferroniobium for fine adjustment of components, then adding pure calcium wires and blowing argon for soft blowing time is more than or equal to 10min; In the continuous casting process, a crystallizer is adopted for production, the superheat degree is controlled at 25-40 ℃, the water flow rate of the crystallizer is 95+/-10 m 3 /h, the water flow rate of a foot roller is 4.0+/-1.0 m 3 /h, the water flow rate of secondary cooling water is 4.0+/-1.0 m 3 /h, the pulling speed is controlled at 0.8-1.0 m/min, external electromagnetic stirring is adopted, the current intensity is 450-500A, and the frequency is 2.5Hz; In the hot-rolling process, a heating furnace is adopted for production, the heating temperature of the heating furnace is 1100-1200 ℃, the heating time is controlled within 180min, and meanwhile, rolling is carried out in a rolling control and cooling mode, the rolling temperature is less than or equal to 950 ℃, and the wire-laying temperature is less than or equal to 800 ℃; the high-chromium ferrite stainless steel wire rod comprises the following chemical components in percentage by mass, wherein the balance of C≤0.030%、Cr:27.20~27.80%、Ni:1.10~1.50%、Cu≤0.20%、Nb：0.10~0.20%、Mn:0.40~0.70%、Si:0.20~0.50%、P:0.010~0.020%、S≤0.005%、N≤0.040%, is Fe and unavoidable impurities.
2. The method for manufacturing a high-chromium ferrite stainless steel wire rod for glass sealing according to claim 1, wherein the method comprises the following steps: in the continuous casting billet circulation process, a hot-rolling mode is adopted for circulation.
3. The method for manufacturing a high-chromium ferrite stainless steel wire rod for glass sealing according to claim 1, wherein the temperature of the blank entering the furnace is more than or equal to 350 ℃ in the continuous casting blank circulation process.
4. The method of manufacturing a high chromium ferrite stainless steel wire rod for glass sealing according to claim 1, wherein the hot rolling step is performed by using a high-speed torsion-free rolling mill for the Daniel wire rod, and the steel wire rod is cooled on a Steyr air-cooled roller way after the rolling.
5. The method for manufacturing a high-chromium ferrite stainless steel wire rod for glass sealing according to claim 1, wherein in the solid solution treatment process, the solid solution treatment temperature is 800-850 ℃, and the heat preservation time is more than 3 hours.

Description

Stainless steel wire rod for glass sealing high-chromium ferrite and manufacturing method Technical Field The invention relates to the technical field of high-chromium ferrite stainless steel smelting and wire rod rolling, in particular to a high-chromium ferrite stainless steel wire rod for glass sealing and a manufacturing method thereof. Background The ferrochrome 4J28 is an expansion alloy with special thermal expansion characteristics, is a common metal material in an electric vacuum device, is used for matching and sealing with corresponding soft glass, and is an important sealing structure material in the electric vacuum industry. The material is widely applied to the fields of electronic industry, precision measuring tools, precision instruments, cryogenic engineering and the like. The 4J28 stainless steel has higher ductile-brittle transition temperature, and meanwhile, the material is softer and has weak plastic toughness at high temperature, so that the production difficulty is brought to the smelting of blanks and the rolling of wire rods, and in industrial production, the material is often required to be cold-processed and punched into various sealing parts with complex shapes, and the current material characteristics and production process cannot meet the production requirements. Disclosure of Invention In order to solve the problems in the background art, the invention provides the high-chromium ferrite stainless steel wire rod for glass sealing and the preparation method thereof, and the stainless steel composition design and the optimization of the production process conditions enable the material to have good surface quality, excellent plasticity and toughness, finer grain size, reasonable thermal expansion coefficient and simple manufacturing flow, and mass production can be carried out. The invention provides a manufacturing method of a high-chromium ferrite stainless steel wire rod for glass sealing, which comprises the following steps of sequentially carrying out electric arc furnace smelting, AOD smelting, LF smelting, continuous casting, hot-feed rolling and solid solution treatment on raw materials to finally obtain a stainless steel wire rod finished product, In the smelting process of the electric arc furnace, controlling the Si content of tapping to be 0.2-0.7%, and the P content to be less than or equal to 0.015%; in the AOD smelting process, argon is blown in the whole process, the content of C is controlled to be less than or equal to 0.020 percent, and meanwhile, the tapping temperature is controlled to be less than or equal to 1700 ℃; in the LF smelting process, firstly adding ferrochrome, electrolytic manganese and ferroniobium for fine adjustment of components, then adding pure calcium wires and blowing argon for soft blowing time is more than or equal to 10min; the high-chromium ferrite stainless steel wire rod comprises the following chemical components in percentage by mass, wherein the balance of C≤0.030%、Cr:27.20~27.80%、Ni:1.10~1.50%、Cu≤0.20%、Nb：0.10~0.20%、Mn:0.40~0.70%、Si:0.20~0.50%、P:0.010~0.020%、S≤0.005%、N≤0.040%, is Fe and unavoidable impurities. Preferably, in the arc furnace smelting process, the tapping temperature is controlled to be 50-100 ℃ in liquidus temperature. The AOD smelting process comprises a steel melting stage, a decarburization stage, a reduction stage and a refining stage, wherein cold lime is added in the steel melting stage, ferrochrome is added, coarse molten steel of an electric arc furnace is added, oxygen is fed and the temperature is raised, the temperature is controlled to be over 1650 ℃ in the decarburization and chromium retention mode by oxygen blowing, ferrosilicon, a proper amount of lime and fluorite are added in the reduction stage, slag skimming is carried out after stirring, lime and fluorite are added in the refining stage, ferrochrome and electrolytic manganese are added according to the sampling spectrum components for component fine adjustment, and tapping temperature is controlled. Preferably, in the continuous casting process, a crystallizer is adopted for production, the superheat degree is controlled at 25-40 ℃, the water flow rate of the crystallizer is 95+/-10 m < 3 >/h, the water flow rate of a foot roller is 4.0+/-1.0 m < 3 >/h, the water flow rate of secondary cooling water is 4.0+/-1.0 m < 3 >/h, the pulling speed is controlled at 0.8-1.0 m < min, external electromagnetic stirring is adopted, the current intensity is 450-500A, and the frequency is 2.5Hz. Preferably, in the continuous casting billet circulation process, circulation is performed by adopting a hot-rolling mode. Preferably, in the continuous casting billet circulation process, the billet charging temperature is more than or equal to 350 ℃. Preferably, in the hot-rolling process, a heating furnace is adopted for production, the heating temperature of the heating furnace is 1100-1200 ℃, the heating time is controlled within 180min, meanwhile, rolling is