CN107030264B - Double-roller strip casting and rolling production process for super austenitic stainless steel - Google Patents
Double-roller strip casting and rolling production process for super austenitic stainless steel Download PDFInfo
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- CN107030264B CN107030264B CN201710288311.6A CN201710288311A CN107030264B CN 107030264 B CN107030264 B CN 107030264B CN 201710288311 A CN201710288311 A CN 201710288311A CN 107030264 B CN107030264 B CN 107030264B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0697—Accessories therefor for casting in a protected atmosphere
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a super austenitic stainless steel double-roller thin strip casting-rolling production process, which comprises the following steps: (1) hoisting the molten steel with qualified components to a ladle turret; (2) pouring molten steel into a tundish; (3) double-roller casting and rolling; (4) hot rolling the strip blank; (5) cooling the strip steel and cutting off the head and the tail; (6) and (5) coiling the strip steel. The invention directly produces the super austenitic stainless steel thin strip by the double-roller casting rolling, simplifies the hot rolling process, and avoids the surface cracking and the layered cracking of the super austenitic stainless steel during the hot rolling in the prior art. The production of 1.0-3.5mm thin gauge is realized by combining double-roller casting and hot rolling, qualified raw materials are provided for the subsequent cold rolling process, the production flow is shortened, and the energy consumption is reduced.
Description
Technical field
The invention belongs to thin-belt casting rolling production metallurgy field of engineering technology, and in particular to a kind of super austenitic stainless steel is double
Roll strip casting rolling production process.
Background technique
The metallographic structure of super austenitic stainless steel is the fully austenitic structure with face-centred cubic structure, is a kind of low-carbon
High-alloy steel, since the addition of the alloying elements such as Gao Ge, molybdenum, nickel, copper has this kind of steel, intensity is high, hardness is big, impact flexibility
Well, the strong and excellent corrosion resistance of good welding performance, high temperature creep-resisting ability.The particularization of super austenitic stainless steel
Study point, tissue and performance are widely used this kind of steel in every field, especially in many harsh work condition environments
In, such as paper pulp and paper-making industry, pharmaceuticals industry, chemical fertilizer industry and sea field.But due to the conjunction of super austenitic stainless steel
Golden component content is higher, especially Mo, Cr, makes to be easy carbide precipitate, chromium nitride and some intermetallics in stainless steel
Object, as σ phase, chi phase, Laves are equal.Especially when the use of temperature being 600~1000 DEG C, the second phase is easier from stainless
It is precipitated in steel.If amount of precipitation reaches certain value, these interphases can reduce the mechanical property and corrosion resistance of material, thus
Influence the service performance of material.
During prior art produces super austenitic stainless steel, since the high alloy content of super austenitic stainless steel causes
Make such steel manufacturing process require become very high, increase production difficulty, be prone in the hot rolling delamination splitting and
Crack of surface layer etc., this is greatly lowered product quality and lumber recovery.Further, since super austenitic stainless steel intensity is high, heat
5mm or more think gauge can only be produced by rolling, and seriously affect the popularization and application of super austenitic stainless steel.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of super Ovshinsky aiming at the problems existing in the prior art
Body stainless steel double roll strip casting rolling production process.
Technical problem to solve of the invention adopts the following technical scheme that
A kind of super austenitic stainless steel double roll strip casting rolling production process, the specific steps are as follows:
(1) molten steel of ingredient qualification is hoisted to bale panoramic tables: not by the super austenitic after the refining of LF ladle refining furnace
Rust steel molten steel is hoisted to bale panoramic tables, calm 15-25min；
(2) molten steel is injected into tundish: tundish blowing argon gas 10-20min, which drives out of, passes through long nozzle for steel after air in packet
Water is injected into tundish from ladle, and degree of superheat control is added on 20 DEG C -40 DEG C, molten steel to be mingled with for keeping the temperature and adsorbing
Tundish covering flux；；
(3) double-roller rolling: molten steel is injected in twin-roll cast-rolling mill by submersed nozzle, and slab speed is 80-120 m/
Min, casting roller gap is adjustable between 1.5-4.5mm, and the gaseous mixture of argon gas or argon gas and hydrogen is used during MOLTEN STEEL FLOW
Body is protected, and for molten steel in Casting Roller in process of setting, cooling rate control range is 300-700 DEG C/s；
(4) made-up belt hot rolling: roll casting sheet protects gas in the mixed gas protected lower carry out hot rolling of argon gas or argon gas and hydrogen
Body pressure 0.3-0.5MPa, made-up belt are sent to hot-rolling mill through pinch roller and carry out constant-tension rolling, and mill speed range is 100-150
M/min, wherein the control of made-up belt hot-rolled temperature is 1050-1200 DEG C, and steel strip thickness control range is 1.2- after made-up belt hot rolling
3.6mm；
(5) strip cooling and excision end to end
Strip after hot rolling is cooling, is sent to cutter through pinch roller and carries out the excision of strip end to end；
(6) strip coiling
Strip after excision end to end is sent to coiling machine through pinch roller and carries out strip coiling, obtains finished product thin strip steel coil.
Protective gas pressure is 0.3-0.5MPa in the step (3).
The volume ratio of argon gas and hydrogen is 3: 1 in the step (3).
Protective gas pressure is 0.3-0.5MPa in the step (4).
The volume ratio of argon gas and hydrogen is 3: 1 in the step (4).
Strip in the step (5) after hot rolling is cooled to 600-650 DEG C through cooling facility for laminar flow.
Double-roll type thin-belt casting rolling technology is metallurgical cutting edge technology, has realized industrial application in carbon steel production.We are according to double
It the characteristics of roll-type thin-belt casting rolling technique, is introduced into the production of super purified austenitic stainless steel, by reasonable matching thickness, pours
The key process parameters such as temperature, teeming speed, cooling rate are cast, the qualified super austenitic stainless steel of high quality, low cost is realized
The production of product.The invention has the benefit that (1) directly produces super austenitic stainless steel strip by double-roller rolling,
Simplify hot-rolled process, the crack of surface layer and delamination splitting of super austenitic stainless steel when avoiding prior art hot rolling.(2) by double
Roller casting and hot rolling combine, and realize the production of 1.2-3.6mm thin gauge, and qualified raw material is provided for subsequent cold-rolling process,
Energy consumption is reduced while shortening production procedure.(3) casting and course of hot rolling whole process are using the mixed of argon gas or argon gas and hydrogen
Gas shield is closed, Molten Steel Cleanliness is high, and scale on surface is thin, is conducive to improve product surface quality and subsequent pickling cost
Reduction, the raising of production efficiency.
Detailed description of the invention
Fig. 1 is super austenitic stainless steel thin-belt casting rolling production procedure schematic diagram of the present invention.
Specific embodiment
In conjunction with specific embodiments, the present invention is described in further detail, but embodiments of the present invention are not limited to
This.
Embodiment 1
A kind of thickness 1.2mm, steel grade 904L super austenitic stainless steel double roll strip casting rolling production process include following step
It is rapid:
(1) molten steel of ingredient qualification is hoisted to bale panoramic tables: not by the super austenitic after the refining of LF ladle refining furnace
Rust steel molten steel is hoisted to bale panoramic tables, calm 20min；
(2) molten steel is injected into tundish: tundish blowing argon gas 15min drive out of in packet after air by long nozzle by molten steel from
Ladle is injected into tundish, and the degree of superheat is controlled at 30 DEG C, is added above molten steel for keeping the temperature and adsorbing the intermediate cladding being mingled with
Lid agent；
(3) double-roller rolling: molten steel is injected into twin-roll cast-rolling mill by submersed nozzle, and slab speed is 120m/min,
It is 1.5mm that Casting Roller, which presets roll gap, uses argon gas to be protected during MOLTEN STEEL FLOW, protective gas pressure 0.5Mpa, casting
The made-up belt obtained afterwards is with a thickness of 1.5mm.For molten steel in Casting Roller in process of setting, cooling rate control range is 700 DEG C/s；
(4) made-up belt hot rolling: roll casting sheet carries out hot rolling under protection of argon gas, and protective gas pressure 0.5Mpa, made-up belt is through pressing from both sides
Send roller be sent to hot-rolling mill carry out constant-tension rolling, 150 m/min of mill speed, 1200 DEG C of made-up belt hot-rolled temperature, after made-up belt hot rolling
Steel strip thickness is 1.2mm；
(5) strip cooling and excision end to end
When the strip that temperature is 950 DEG C after hot rolling is cooled to 650 DEG C through cooling facility for laminar flow, then shearing is sent to through pinch roller
Machine carries out the excision of strip end to end；
(6) strip coiling
Strip after excision end to end is sent to coiling machine through pinch roller and carries out strip coiling, obtains finished product thin strip steel coil.
Embodiment 2
A kind of thickness 1.8mm, steel grade 904L super austenitic stainless steel double roll strip casting rolling production process include following step
It is rapid:
(1) molten steel of ingredient qualification is hoisted to bale panoramic tables: not by the super austenitic after the refining of LF ladle refining furnace
Rust steel molten steel is hoisted to bale panoramic tables, calm 20min；
(2) molten steel is injected into tundish: tundish blowing argon gas 15min drive out of in packet after air by long nozzle by molten steel from
Ladle is injected into tundish, and the degree of superheat is controlled at 30 DEG C, is added above molten steel for keeping the temperature and adsorbing the intermediate cladding being mingled with
Lid agent；
(3) double-roller rolling: molten steel is injected into twin-roll cast-rolling mill by submersed nozzle, and slab speed is 100m/min,
It is 2.5mm that Casting Roller, which presets roll gap, uses the mixed gas of argon gas and hydrogen to be protected during MOLTEN STEEL FLOW, wherein argon gas
Volume ratio with hydrogen is 3: 1, and protective gas pressure 0.3MPa, the made-up belt obtained after casting is with a thickness of 2.5mm, and molten steel is in casting
In roller in process of setting, cooling rate control range is 500 DEG C/s；
(4) made-up belt hot rolling: roll casting sheet is in the mixed gas protected lower carry out hot rolling of argon gas and hydrogen, wherein argon gas and hydrogen
The volume ratio of gas is 3: 1, protective gas pressure 0.3MPa.Made-up belt is sent to hot-rolling mill through pinch roller and carries out constant-tension rolling, rolling
139 m/min of speed, 1100 DEG C of made-up belt hot-rolled temperature, steel strip thickness is 1.8mm after made-up belt hot rolling；
(5) strip cooling and excision end to end
When the strip that temperature is 910 DEG C after hot rolling is cooled to 620 DEG C through cooling facility for laminar flow, then shearing is sent to through pinch roller
Machine carries out the excision of strip end to end；
(6) strip coiling
Strip after excision end to end is sent to coiling machine through pinch roller and carries out strip coiling, obtains finished product thin strip steel coil.
Embodiment 3
A kind of thickness 3.6mm, steel grade 904L super austenitic stainless steel double roll strip casting rolling production process include following step
It is rapid:
(1) molten steel of ingredient qualification is hoisted to bale panoramic tables: not by the super austenitic after the refining of LF ladle refining furnace
Rust steel molten steel is hoisted to bale panoramic tables, calm 20min；
(2) molten steel is injected into tundish: tundish blowing argon gas 15min drive out of in packet after air by long nozzle by molten steel from
Ladle is injected into tundish, and the degree of superheat is controlled at 30 DEG C, is added above molten steel for keeping the temperature and adsorbing the intermediate cladding being mingled with
Lid agent；
(3) double-roller rolling: molten steel is injected into twin-roll cast-rolling mill by submersed nozzle, and slab speed is 80m/min, casting
It is 4.5mm that roll, which presets roll gap,.Argon gas is used to be protected during MOLTEN STEEL FLOW, protective gas pressure 0.5MPa, after casting
Obtained made-up belt is with a thickness of 4.5mm, and for molten steel in Casting Roller in process of setting, cooling rate is 300 DEG C/s；
(4) made-up belt hot rolling: roll casting sheet carries out hot rolling, protective gas pressure 0.5MPa under protection of argon gas.Made-up belt is through pressing from both sides
Send roller be sent to hot-rolling mill carry out constant-tension rolling, 100 m/min of mill speed, 1050 DEG C of made-up belt hot-rolled temperature, after made-up belt hot rolling
Steel strip thickness is 3.6mm；
(5) strip cooling and excision end to end
When the strip that temperature is 900 DEG C after hot rolling is cooled to 600 DEG C through cooling facility for laminar flow, then shearing is sent to through pinch roller
Machine carries out the excision of strip end to end；
(6) strip coiling
Strip after excision end to end is sent to coiling machine through pinch roller and carries out strip coiling, obtains finished product thin strip steel coil.
Claims (5)
1. a kind of super austenitic stainless steel double roll strip casting rolling production process, it is characterised in that specific step is as follows:
(1) molten steel of ingredient qualification is hoisted to bale panoramic tables: by the super austenitic stainless steel after the refining of LF ladle refining furnace
Molten steel is hoisted to bale panoramic tables, calm 15-25min；
(2) molten steel is injected into tundish: tundish blowing argon gas 10-20min drive out of in packet after air by long nozzle by molten steel from
Ladle is injected into tundish, and degree of superheat control is added on 20 DEG C -40 DEG C, molten steel for keeping the temperature and adsorbing the centre being mingled with
Covering agent；
(3) double-roller rolling: molten steel is injected in twin-roll cast-rolling mill by submersed nozzle, and slab speed is 80-120 m/min, casting
Roller gap is adjustable between 1.5-4.5mm, and the mixed gas of argon gas or argon gas and hydrogen is used to carry out during MOLTEN STEEL FLOW
Protection, for molten steel in Casting Roller in process of setting, cooling rate control range is 300-700 DEG C/s；
(4) made-up belt hot rolling: mixed gas protected lower carry out hot rolling of the roll casting sheet in argon gas or argon gas and hydrogen, protective gas pressure
Power 0.3-0.5MPa, made-up belt are sent to hot-rolling mill through pinch roller and carry out constant-tension rolling, and mill speed range is 100-150 m/
Min, wherein the control of made-up belt hot-rolled temperature is 1050-1200 DEG C, and steel strip thickness control range is 1.2-3.6mm after made-up belt hot rolling；
(5) strip cooling and excision end to end
Strip after hot rolling is cooling, is sent to cutter through pinch roller and carries out the excision of strip end to end；
(6) strip coiling
Strip after excision end to end is sent to coiling machine through pinch roller and carries out strip coiling, obtains finished product thin strip steel coil.
2. a kind of super austenitic stainless steel double roll strip casting rolling production process according to claim 1, it is characterised in that:
Protective gas pressure is 0.3-0.5MPa in the step (3).
3. a kind of super austenitic stainless steel double roll strip casting rolling production process according to claim 2, it is characterised in that:
The volume ratio of argon gas and hydrogen is 3: 1 in the step (3).
4. a kind of super austenitic stainless steel double roll strip casting rolling production process according to claim 3, it is characterised in that:
The volume ratio of argon gas and hydrogen is 3: 1 in the step (4).
5. a kind of super austenitic stainless steel double roll strip casting rolling production process according to claim 3 or 4, feature exist
In: the strip in the step (5) after hot rolling is cooled to 600-650 DEG C through cooling facility for laminar flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710288311.6A CN107030264B (en) | 2017-04-27 | 2017-04-27 | Double-roller strip casting and rolling production process for super austenitic stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710288311.6A CN107030264B (en) | 2017-04-27 | 2017-04-27 | Double-roller strip casting and rolling production process for super austenitic stainless steel |
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| CN107030264B true CN107030264B (en) | 2019-04-26 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108611565B (en) * | 2018-05-25 | 2019-12-06 | 江苏集萃冶金技术研究院有限公司 | Method for preparing high-strength low-alloy steel by twin-roll thin strip casting and aging process |
| CN108359909B (en) * | 2018-05-25 | 2020-01-03 | 江苏集萃冶金技术研究院有限公司 | Method for preparing high-strength and high-toughness martensitic steel through thin strip casting and rolling and aging process |
| CN111389914B (en) * | 2020-03-02 | 2022-03-25 | 北京鼎新时代科技有限公司 | Production method of super austenite 904L stainless steel plate strip |
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