CN101648211B - Rolling method of dual-phase stainless steel hot continuous rolled coil - Google Patents
Rolling method of dual-phase stainless steel hot continuous rolled coil Download PDFInfo
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- CN101648211B CN101648211B CN2009100753861A CN200910075386A CN101648211B CN 101648211 B CN101648211 B CN 101648211B CN 2009100753861 A CN2009100753861 A CN 2009100753861A CN 200910075386 A CN200910075386 A CN 200910075386A CN 101648211 B CN101648211 B CN 101648211B
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Abstract
The invention relates to a rolling method of a dual-phase stainless steel hot continuous rolled coil, which comprises the following steps: I, grinding a casting blank, i.e. grinding the outer surface of the casting blank without macroscopic defects on the surface after the grinding; II, heating, i.e. heating with hot furnace temperature of 1200-1280 DEG C and furnace halting time of 180mm thick casting blank of 220-260min and 200 thick casting blank of 240-280min; III, rough rolling, i.e. placing the casting blank with the temperature is 1100-1150 DEG C before the rolling into a reversible type rolling mill to be rolled into a plate blank finished product with the thickness of 34-40mm; IV, finish rolling, i.e. placing the plate blank to a finishing mill group to be rolled with final rolling temperature higher than or equal to 950 DEG C into a coil finished product with the thickness of 4-12mm; V, rolling, i.e. placing the coil into a laminar flow to be cooled after the finish rolling, and ensuring rolling temperature to be 750-800 DEG C; VI, performing heat treatment on the coil, i.e. placing the coil into a continuous type heating furnace to be subjected to the heat treatment with heat treatment plate temperature of 1020-1100 DEG C, and water-cooling the coil after the coil is taken out of the continuous type heating furnace, wherein the temperature of the coil is generally lower than or equal to 100 DEG C after the coil is cooled; and VII, acid-washing the coil. The rolling method of the dual-phase stainless steel hot continuous rolled coil prevents the detects of the edge cracking, the decoiling and the fracture of the hot continuous rolled coil.
Description
Technical field
The present invention relates to a kind of milling method of two phase stainless steel hot continuous rolling roll bending, specifically is a kind of milling method of S31803 two phase stainless steel hot continuous rolling roll bending.
Background technology
The S31803 two phase stainless steel is the coexistence of austenite and ferrite in room temperature texture, and general ratio is near 1: 1, and such steel grade has high strength (its yield strength is generally the twice of austenitic stainless steel), good anti-Cl
-Outstanding advantages such as spot corrosion, anticorrosion stress-resistant and welding performance are used widely in petrochemical industry, salt manufacturing, water conservancy project, shipbuilding, field such as civilian.Compare with common austenitic stainless steel and super austenitic stainless steel, the content of Ni obviously reduces in the steel, and manufacturing cost reduces, and belongs to the resource-conserving steel grade.
At present, plate in the S31803 two phase stainless steel of employing " individual medium plate rolling " process exploitation, product is used for fields such as petrochemical industry, shipbuilding in a large number.For rolling production, all adopt the production technology of " steckel rolling system " successfully to produce both at home and abroad.And adopt general hot continuous rolling process production, and being easy to generate defectives such as the roll bending limit is split, uncoiling fracture, qualification rate is very low.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing two phase stainless steel hot continuous rolling roll bending milling method; The present invention provides the milling method of the high two phase stainless steel hot continuous rolling roll bending of a kind of yield rate, with the rolling two phase stainless steel hot continuous rolling roll bending of this method avoided that the limit of hot continuous rolling roll bending is split, uncoiling fracture defective.
The present invention is directed to the characteristic of S31803 steel grade and the characteristics of roll bending production technology; Through technologies such as hot rolling reduction ratio, hot rolling pass, the temperature of curling are adjusted; Solve difficult problems such as S31803 two phase stainless steel hot continuous rolling roll bending limit is split, uncoiling fracture, produced qualified hot-rolled coil.
The milling method of this two phase stainless steel hot continuous rolling roll bending comprises following sequential steps:
I reconditioning strand
The appearance of S31803 two phase stainless steel strand is carried out reconditioning, and strand reconditioning rate is 2.0%～3.0%, and casting billet surface does not have macroscopic defective after the reconditioning.
The specification of S31803 two phase stainless steel strand is: (180-200) mm * 1200～2000mm * 8000～12000mm,
The mass percent of S31803 two phase stainless steel strand composition is:
0.01％≤C≤0.030％ 0.30％≤Si≤1.00％ 0.50％≤Mn≤2.00％ P≤0.030％
S≤0.020% Cr:21.0%～23.0% Ni:4.50%～6.50% Mo:2.50%～3.50%N:0.08%～0.20%, all the other are Fe and unavoidable impurities.
The II heating
Strand is delivered to the walking beam furnace heating, the heating furnace temperature: 1200～1280 ℃, the thick strand of time in the stove: 180mm, 220～260min, the thick strand 240～280min of 200mm.
The III roughing
It is rolling that strand is delivered to reversible mill, and the strand temperature is 1100-1150 ℃ before the hot rolling, is rolled into the slab that thickness is 34～40mm through reversible mill.
IV finish rolling
It is rolling that slab is delivered to mm finishing mill unit, and finishing temperature is not less than 950 ℃, and rolling through mm finishing mill unit, rolling finished product thickness is the roll bending of 4～12mm.
V curls
The laminar flow cooling is dropped in the intact back of finish rolling, and the temperature that guarantees to curl is 750 ℃～800 ℃.
The heat treatment of VI roll bending
Roll bending is delivered to continuous-type furnace heat treatment, 1020～1100 ℃ of heat treatment plate temperature.Roll bending speed of service 10-20m/min in the stove.Water-cooled after heat treatment is come out of the stove, cooling back band temperature generally is not higher than 100 ℃.
The pickling of VII roll bending
Pickling medium: H
2SO
4Pickling mode: electrolysis; Acid concentration: 200-280 (g/l); Temperature: 50-90 ℃ of acid.
In the two phase stainless steel roll bending milling method provided by the invention, the mechanism of technical process is such:
The heating of strand: purpose is to reduce resistance of deformation, and under the situation that guarantees heating-up temperature, it is even that strand is grilled thoroughly.Temperature is too high will to make grain growth, cause rolling crack easily; It is big that temperature is crossed low-intensity, deformation.
The roughing of strand, finish rolling: because the tissue of S31803 steel is ferrite and austenite coexistence; And the softening mechanism of the two is different; Ferrite mainly is the dynamic recovery in the strain path, and austenite is the dynamic recrystallization that is higher than critical value, therefore in thermal deformation process; Produce the inharmonious distortion of two phases, the stress skewness causes crack nucleation and expansion at the phase boundary place easily.Big rate of deformation has increased replys and the critical strain amount that takes place of crystallization again, and it is very fast that dislocation density increases, make begin to reply and again crystallization speed reduce, work hardening can not eliminate to greatest extent, improves the sensitiveness that crackle produces.Therefore multi-pass deformation is adopted in roughing, and finish rolling takes the small deformation amount to be rolled.
Curl: because S31803 contains high Cr, Mo, and be austenite and ferrite coexistence, to the extremely sensitivity of separating out of σ phase, this is also common 304,316L does not have.σ is intermetallic compound mutually, its characteristic feature has been enrichment Cr, Mo, and also hard, crisp.In the S31803 two phase stainless steel, between 600-1020 ℃, all there is σ to separate out mutually; Separating out more obviously more than 850 ℃, the mechanism of separating out is for " α → γ+σ ", in case separate out; Plasticity, toughness and the corrosion resistance of meeting severe exacerbation material cause the crooked fracture that occurs.
For preventing the S31803 too high σ of the separating out phase of back temperature of curling, and brittle fracture occurs, the laminar flow cooling is dropped in the intact back of finish rolling, and the temperature that guarantees to curl is 600～800 ℃.
The present invention adopts qualified S31803 two phase stainless steel strand material; Through adopting rational heating, roughing, finish rolling, the technology of curling; Avoid the S31803 two phase stainless steel in the roll bending course of hot rolling, to produce raw edges and separate out σ and cause mutually defectives such as roll bending fracture, produced up-to-standard roll bending.Qualification rate is 100%, has obviously improved lumber recovery, and the roll bending performance satisfies standard-required, steady quality.
Specify the milling method of S31803 two phase stainless steel hot continuous rolling roll bending below in conjunction with embodiment, but the specific embodiment of two phase stainless steel roll bending milling method of the present invention is not limited to following embodiment.
The specific embodiment
The milling method of this two phase stainless steel hot continuous rolling roll bending comprises following sequential steps:
I reconditioning strand
The appearance of S31803 two phase stainless steel strand is carried out reconditioning, casting blank specification 200mm * 1535mm * 8700mm, strand reconditioning rate is 2.8%, casting billet surface does not have macroscopic defective after the reconditioning.
The quality per distribution ratio of present embodiment S31803 chemical composition is:
C：0.023％ Si：0.70％ Mn：0.80％ P：0.028％ S：0.006％
Cr：22.47％ Ni：5.31％ ?Mo：3.42％ ?N：0.19％
All the other are Fe and unavoidable impurities.
The II heating
Strand heats at walking beam furnace, the heating furnace temperature: 1270 ℃, and the time in the stove: 250min.
The III roughing
It is rolling that strand is delivered to reversible mill, and the strand temperature is 1100-1150 ℃ before the strand hot rolling, and rolling through reversible mill, rolling thickness is the slab of 37mm.
IV finish rolling
It is rolling that slab is delivered to mm finishing mill unit, rolling through mm finishing mill unit, 970 ℃ of finishing temperatures, and rolling finished product thickness is 6mm.
V curls
The laminar flow cooling is dropped in the intact back of finish rolling, and curling temperature is 700 ℃.
The heat treatment of VI roll bending
Roll bending is sent into continuous-type furnace heat treatment, 1040 ℃ of heat treatment plate temperature, roll bending speed of service 10-20m/min in the stove.
Water-cooled after heat treatment is come out of the stove, cooling back band temperature generally is not higher than 100 ℃.
The pickling of VII roll bending
Pickling medium: H
2SO
4Pickling mode: electrolysis; Acid concentration: 270 (g/l); The acid temperature: 60 ℃, pickling speed: 18m/min.
Claims (1)
1. the milling method of a two phase stainless steel hot continuous rolling roll bending, it comprises following sequential steps:
I reconditioning strand
The appearance of S31803 two phase stainless steel strand is carried out reconditioning, and strand reconditioning rate is 2.0%～3.0%, and casting billet surface does not have macroscopic defective after the reconditioning;
The II heating
Strand is delivered to the walking beam furnace heating, the heating furnace temperature: 1200～1280 ℃, the thick strand of time in the stove: 180mm, 220～260min, the thick strand 240～280min of 200mm;
The III roughing
It is rolling that strand is delivered to reversible mill, and the strand temperature is 1100-1150 ℃ before the hot rolling, is rolled into the slab that thickness is 34～40mm through reversible mill;
IV finish rolling
It is rolling that slab is delivered to mm finishing mill unit, and finishing temperature is not less than 950 ℃, and rolling through mm finishing mill unit, rolling finished product thickness is the roll bending of 4～12mm;
V curls
The laminar flow cooling is dropped in the intact back of finish rolling, and the temperature that guarantees to curl is 750～800 ℃;
The heat treatment of VI roll bending
Roll bending is delivered to continuous-type furnace heat treatment, 1020-1100 ℃ of heat treatment plate temperature; Roll bending speed of service 10-20m/min in the stove; Water-cooled after heat treatment is come out of the stove, cooling back band temperature is not higher than 100 ℃;
The pickling of VII roll bending.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102773266A (en) * | 2012-06-12 | 2012-11-14 | 山西太钢不锈钢股份有限公司 | Method for rolling double-phase stainless steel pipe blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773266A (en) * | 2012-06-12 | 2012-11-14 | 山西太钢不锈钢股份有限公司 | Method for rolling double-phase stainless steel pipe blank |
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