CN112195411A - 400-series high-nitrogen stainless steel and production method thereof - Google Patents

400-series high-nitrogen stainless steel and production method thereof Download PDF

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Publication number
CN112195411A
CN112195411A CN202011082809.5A CN202011082809A CN112195411A CN 112195411 A CN112195411 A CN 112195411A CN 202011082809 A CN202011082809 A CN 202011082809A CN 112195411 A CN112195411 A CN 112195411A
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Prior art keywords
nitrogen
stainless steel
molten iron
content
reduction
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CN202011082809.5A
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Chinese (zh)
Inventor
王永胜
赵刚
吴荣刚
焦玉水
乔春刚
殷齐敏
张爽
魏述一
许桂兴
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Shandong Taishan Steel Group
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Shandong Taishan Steel Group
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Priority to CN202011082809.5A priority Critical patent/CN112195411A/en
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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses 400-series high-nitrogen stainless steel which comprises the following components: 0.16-0.25% of carbon C, 0.30-0.6% of silicon Si, 0.50-0.8% of manganese Mn, 13.0-14.0% of chromium Cr, 0.01-0.030% of phosphorus P, 0.01-0.020% of sulfur S, 0.070-0.09% of nitrogen N, and 84.21-85.95% of iron and residual elements; a production method of 400 series high-nitrogen stainless steel comprises the following steps: s1, molten iron dephosphorization process; s2, a TSR furnace converting process; s3, LF refining; and S4, a continuous casting process. The invention has the advantages that: the stainless steel slab has stable components, no defects of cracks, shrinkage cavities, bubbles and the like, and is convenient to produce.

Description

400-series high-nitrogen stainless steel and production method thereof
Technical Field
The invention relates to the technical field of metallurgy, in particular to 400-series high-nitrogen stainless steel and a production method thereof.
Background
The 400 series high nitrogen stainless steel has high strength, high hardness and strong corrosion resistance. However, the 400 series stainless steel has low nitrogen solubility, the nitrogen component control is unstable in the smelting process, and the defects of bubbles, cracks, cavities, segregation and the like are easy to occur in the casting process. The production difficulty of the 400 series high nitrogen stainless steel is high, and the yield is low.
Disclosure of Invention
The invention aims to solve the technical problem and provides 400-series high-nitrogen stainless steel which is stable in stainless steel slab components, free of defects such as cracks, shrinkage cavities and bubbles in the cast slab and convenient to produce and a production method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a400 series high nitrogen stainless steel comprises the following components: 0.16-0.25% of carbon C, 0.30-0.6% of silicon Si, 0.50-0.8% of manganese Mn, 13.0-14.0% of chromium Cr, 0.01-0.030% of phosphorus P, 0.01-0.020% of sulfur S, 0.070-0.09% of nitrogen N, and 84.21-85.95% of iron and residual elements.
A production method of 400 series high-nitrogen stainless steel comprises the following steps:
s1, dephosphorization is carried out on the molten iron, the content of phosphorus P in the molten iron is more than 0.035% before treatment, the molten iron is dephosphorized by lime powder, slag is removed cleanly after dephosphorization, and the content of phosphorus P in the molten iron is less than 150ppm after pretreatment;
s2, a TSR furnace blowing process, wherein the addition amount of high-carbon chromium iron is 20-25%, the addition amount of ferrosilicon is 1-1.5%, the addition amount of high-carbon ferromanganese is 0.8-1%, the addition amount of dephosphorized molten iron P is 0.001-0.015%, the temperature of the dephosphorized molten iron is 1300-1350 ℃, the blowing end point is controlled, the temperature is controlled to be 1720-1750 ℃, the content of carbon C is 0.15-0.20%, the reduction time is more than 8 minutes, the content of chromium Cr after reduction is 13.0-14.0%, the color of the slag after reduction is controlled to be white slag, and a secondary desulfurization process is adopted, so that the content of sulfur S in the discharged steel is less than 0.;
s3, LF refining, wherein the molten steel is emptied to 200-400 mm after reaching an LF furnace, the thickness of a slag layer in a ladle is 150-300 mm, the station entering temperature is 1550-1600 ℃, the refining time is 50-70 min, the power transmission time is 10-25 min, lime and fluorite are added to adjust the refining alkalinity so that the alkalinity is more than 2.0, the molten steel alloying is carried out simultaneously, the soft blowing time and the calming time are more than 15min, and the station leaving temperature is 1540-1550 ℃;
and S4, continuous casting, wherein the whole process is adopted for protection pouring, the superheat degree is controlled to be +/-5 ℃, the drawing speed is 1.0-1.1 m/min, the dynamic soft reduction is adopted for more than 2.0mm, the thickness of a continuous casting slab is 200mm, and the width of the continuous casting slab is 1000-1600 mm.
Further, in the TSR furnace converting process in the S2, the TSR furnace adopts top-bottom combined blowing, all inert gases in the oxidation period adopt nitrogen, and the bottom blowing flow rate is more than 40m3Min, nitrogen and argon are used as inert gases in the reduction period, and the bottom blowing flow is more than 60m3And/min, blowing nitrogen gas for nitrogen alloying, tapping after the components of the TSR furnace are stable, and refining by an LF furnace to obtain uniform and stable components and high molten steel purity.
Compared with the prior art, the invention has the advantages that: the components of the 400-series high-nitrogen stainless steel are beneficial to nitrogen fixation, the solubility of nitrogen is ensured, and the process control is stable in the smelting and continuous casting processes; dephosphorization molten iron, blowing in a TSR furnace, LF refining and continuous casting are adopted, so that the process flow is simple, the production quality is stable, and the production cost is low; and the dynamic soft reduction process is adopted, so that the defects of casting blank segregation, shrinkage cavity and the like are reduced.
Detailed Description
Example one
A400 series high nitrogen stainless steel comprises the following components: 0.18% of carbon C, 0.44% of silicon Si, 0.72% of manganese Mn, 13.9% of chromium Cr, 0.021% of phosphorus P, 0.006% of sulfur S, 0.070% of nitrogen N, and the balance of iron and residual elements.
A production method of 400 series high-nitrogen stainless steel comprises the following steps:
s1, dephosphorization of molten iron, wherein 0.086% of molten iron P and 0.46% of Si are dephosphorized by lime powder, slag is removed cleanly after dephosphorization, and the content of phosphorus P in the molten iron is 121ppm after pretreatment;
s2, TSR smelting, wherein the addition amount of high-carbon ferrochrome is 22.8%, the addition amount of ferrosilicon is 1.2%, the addition amount of high-carbon ferromanganese is 0.85%, the phosphorus P content in the dephosphorized molten iron is 0.0121%, the temperature of the dephosphorized molten iron is 1346 ℃, the blowing end point is controlled, the temperature is controlled to 1738 ℃, the carbon C content is 0.17%, the reduction time is 9 minutes, the chromium Cr content after reduction is 13.9%, the color of the slag after reduction is controlled to be white slag, a secondary desulfurization process is adopted, the tapping sulfur content is strictly controlled, and the tapping sulfur content is 0.006%;
and S3, LF refining, wherein the molten steel is emptied to 260mm after reaching the LF furnace, the thickness of a slag layer in a ladle is 180mm, the station entering temperature is 1557 ℃, the refining time is 62min, the power transmission time is 13min, lime and fluorite are added to adjust the refining alkalinity to 2.3, the molten steel is alloyed simultaneously, the soft blowing time is 16 min, the calming time is more than 15min, and the station exiting temperature is 1543 ℃.
And S4, continuous casting, wherein the continuous casting process adopts whole-process protection pouring, the superheat degree is controlled to be minus 5 to plus 3 ℃, the drawing speed is 1.1m/min, the dynamic soft reduction is adopted for more than 2.5mm, and the thickness of a continuous casting slab is 200mm, and the width is 1540 mm.
Example two
A400 series high nitrogen stainless steel comprises the following components: 0.19% of carbon C, 0.42% of silicon Si, 0.70% of manganese Mn, 13.8% of chromium Cr, 0.025% of phosphorus P, 0.006% of sulfur S, 0.073% of nitrogen N, and the balance of iron and residual elements.
S1, dephosphorization of molten iron, wherein 0.092% of molten iron P and 0.48% of Si are dephosphorized by lime powder, slag is removed cleanly after dephosphorization, and the content of phosphorus P in the molten iron is 118ppm after pretreatment;
s2, TSR smelting, wherein the addition amount of high-carbon ferrochrome is 22.1%, the addition amount of ferrosilicon is 1.2%, the addition amount of high-carbon ferromanganese is 0.86%, the P content of dephosphorized molten iron is 0.0118%, the temperature of the dephosphorized molten iron is 1341 ℃, the blowing end point is controlled, the temperature is 1735 ℃, the carbon C content is 0.18%, the reduction time is 10 minutes, the Cr content after reduction is 13.8%, the color of the slag after reduction is controlled to be white slag, a secondary desulfurization process is adopted, the tapping sulfur content is strictly controlled, and the tapping sulfur content is 0.006%.
And S3, LF refining, wherein the clearance of molten steel is 230mm after the molten steel reaches an LF furnace, the thickness of a slag layer in a ladle is 170mm, the station entering temperature is 1561 ℃, the refining time is 60min, the power transmission time is 15min, lime and fluorite are added to adjust the refining alkalinity to be 2.2, the molten steel is alloyed simultaneously, the soft blowing time is 15min, the calming time is more than 15min, and the station leaving temperature is 1541 ℃.
And S4, continuous casting, wherein the continuous casting process adopts whole-process protection pouring, the superheat degree is controlled to be minus 2 to plus 5 ℃, the drawing speed is 1.1m/min, the dynamic soft reduction is adopted for more than 2.5mm, and the thickness of a continuous casting slab is 200mm, and the width is 1540 mm.
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 (3)

1. A400-series high-nitrogen stainless steel is characterized by comprising the following components: 0.16-0.25% of carbon C, 0.30-0.6% of silicon Si, 0.50-0.8% of manganese Mn, 13.0-14.0% of chromium Cr, 0.01-0.030% of phosphorus P, 0.01-0.020% of sulfur S, 0.070-0.09% of nitrogen N, and 84.21-85.95% of iron and residual elements.
2. A production method of 400 series high-nitrogen stainless steel is characterized by comprising the following steps:
s1, dephosphorization is carried out on the molten iron, the content of phosphorus P in the molten iron is more than 0.035% before treatment, the molten iron is dephosphorized by lime powder, slag is removed cleanly after dephosphorization, and the content of phosphorus P in the molten iron is less than 150ppm after pretreatment;
s2, a TSR furnace blowing process, wherein the addition amount of high-carbon chromium iron is 20-25%, the addition amount of ferrosilicon is 1-1.5%, the addition amount of high-carbon ferromanganese is 0.8-1%, the addition amount of dephosphorized molten iron P is 0.001-0.015%, the temperature of the dephosphorized molten iron is 1300-1350 ℃, the blowing end point is controlled, the temperature is controlled to be 1720-1750 ℃, the content of carbon C is 0.15-0.20%, the reduction time is more than 8 minutes, the content of chromium Cr after reduction is 13.0-14.0%, the color of the slag after reduction is controlled to be white slag, and a secondary desulfurization process is adopted, so that the content of sulfur S in the discharged steel is less than 0.;
s3, LF refining, wherein the molten steel is emptied to 200-400 mm after reaching an LF furnace, the thickness of a slag layer in a ladle is 150-300 mm, the station entering temperature is 1550-1600 ℃, the refining time is 50-70 min, the power transmission time is 10-25 min, lime and fluorite are added to adjust the refining alkalinity so that the alkalinity is more than 2.0, the molten steel alloying is carried out simultaneously, the soft blowing time and the calming time are more than 15min, and the station leaving temperature is 1540-1550 ℃;
and S4, continuous casting, wherein the whole process is adopted for protection pouring, the superheat degree is controlled to be +/-5 ℃, the drawing speed is 1.0-1.1 m/min, the dynamic soft reduction is adopted for more than 2.0mm, the thickness of a continuous casting slab is 200mm, and the width of the continuous casting slab is 1000-1600 mm.
3. The method for producing a 400-series high nitrogen stainless steel according to claim 1, wherein: in the TSR furnace converting process in the S2, the TSR furnace adopts top-bottom combined blowing, all inert gases in the oxidation period adopt nitrogen, and the bottom blowing flow rate is more than 40m3Min, nitrogen and argon are used as inert gases in the reduction period, and the bottom blowing flow is more than 60m3/min。
CN202011082809.5A 2020-10-12 2020-10-12 400-series high-nitrogen stainless steel and production method thereof Pending CN112195411A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113088613A (en) * 2021-03-31 2021-07-09 山东泰山钢铁集团有限公司 Operation method for controlling middle cracks of 400-series stainless steel slab

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003231953A (en) * 2001-12-03 2003-08-19 Hitachi Metals Ltd Heat resistant high-chromium ferritic steel with excellent strength at elevated temperature
CN103540871A (en) * 2013-11-07 2014-01-29 首钢总公司 Low-carbon high-chromium high-nitrogen high-corrosion resistance steel and production method thereof
CN106011371A (en) * 2016-06-24 2016-10-12 东北大学 Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method
CN107904352A (en) * 2017-11-28 2018-04-13 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of smelting process of high nitrogen martensitic stain less steel
CN108728754A (en) * 2018-04-04 2018-11-02 中国科学院金属研究所 A kind of martensite antimicrobial stainless steel
CN108941492A (en) * 2018-07-19 2018-12-07 山东泰山钢铁集团有限公司 A kind of high-nitrogen austenitic stainless steel smelting process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003231953A (en) * 2001-12-03 2003-08-19 Hitachi Metals Ltd Heat resistant high-chromium ferritic steel with excellent strength at elevated temperature
CN103540871A (en) * 2013-11-07 2014-01-29 首钢总公司 Low-carbon high-chromium high-nitrogen high-corrosion resistance steel and production method thereof
CN106011371A (en) * 2016-06-24 2016-10-12 东北大学 Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method
CN107904352A (en) * 2017-11-28 2018-04-13 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of smelting process of high nitrogen martensitic stain less steel
CN108728754A (en) * 2018-04-04 2018-11-02 中国科学院金属研究所 A kind of martensite antimicrobial stainless steel
CN108941492A (en) * 2018-07-19 2018-12-07 山东泰山钢铁集团有限公司 A kind of high-nitrogen austenitic stainless steel smelting process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113088613A (en) * 2021-03-31 2021-07-09 山东泰山钢铁集团有限公司 Operation method for controlling middle cracks of 400-series stainless steel slab

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Application publication date: 20210108