CN107674946A - A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel - Google Patents
A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel Download PDFInfo
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- CN107674946A CN107674946A CN201710984913.5A CN201710984913A CN107674946A CN 107674946 A CN107674946 A CN 107674946A CN 201710984913 A CN201710984913 A CN 201710984913A CN 107674946 A CN107674946 A CN 107674946A
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- 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
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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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Abstract
The invention discloses a kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, belong to stainless steel processing technique field, solve the easily broken band of existing process, be easily oxidized, oxide skin is uneven, it is also easy to produce that oxygen is residual, pickling is bad, aberration and rough surface, annealed raw material pollution Environmental costs are high, and equipment is complicated, production line length, the problem of easily scuffing.Technique comprises the following steps：Raw material hot rolling, hot-roll annealing, hot line pickling, rolling, bell-type annealing, shearing packaging.It is of the invention compared with conventional 2D production equipments, bell-type annealing furnace apparatus is simple, floor space is small, equipment cost is low, easy to operate, production method is simple, it is easily achieved, manufactured belt steel surface light, plasticity height, toughness height, surface-brightening, quenching hardness are high, beneficial to slitting, shaping and Surface Machining and surface grinding, it is easy to change and rolls production Thin Specs cutter.
Description
Technical field
The invention belongs to stainless steel processing technique field, and in particular to a kind of martensitic stainless steel for cutting tool cold-strip steel
Annealing process.
Background technology
Stainless-steel cold-rolling strip surface quality is the constantly advanced principal character of modern product quality.In recent years, by
In the progress of production technology and the promotion of the market demand, the product surface quality of martensite stainless cold-rolled steel strip is still developing, special
It is not the stability of belt steel surface, the progress of homogeneity is more prominent.General martensitic stainless steel for cutting tool is mainly supplied surface
There are casting skin, NO.1, roll the surfaces such as hard and 2D, with the raising of user's Surface Quality demand, conventional 2D surface state is not
Can meet the needs of user.2D surface productions technique is complex for martensitic stain less steel, to equipment in production process
State and technological parameter require higher, and control slightly deviation this may result in bad broken belt, pickling, surface chromatic aberration, rough surface
Etc. serious production and quality accident.Following ask be present in traditional martensitic stain less steel cold-rolled steel strip continuous annealing acid cleaning process
Topic：
1st, because producing martensite in welding process broken belt easily occurs in the production process of cold line for martensitic stain less steel, once
Generation broken belt, downtime length and device damage can be caused, causes very big economic loss.
2nd, because martensitic stain less steel chromium content is relatively low, easily oxidation, oxide skin generation is extremely uneven in annealing process, acid
Easily produce that oxygen is residual, pickling is bad, aberration and the defects of rough surface after washing, produce waste product and degradation product.
3rd, cold line annealing use natural gas, pickling using raw materials such as sulfuric acid, hydrofluoric acid and nitric acid, i.e., pollution production of environment into
This is again high.
4th, production equipment is complicated, and production line is longer, easily produces the defects of scuffing.
The content of the invention
It is existing to solve it is an object of the invention to provide a kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel
The easily broken band of technique, easily it is oxidized, oxide skin is uneven, is also easy to produce that oxygen is residual, pickling is bad, aberration and rough surface, annealed raw material
It is high to pollute Environmental costs, and equipment is complicated, production line length, the problem of easily scuffing.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, comprises the following steps：
Step 1: raw material hot rolling：
Use pure plate slab hot rolling to thickness for 3.0-6.0mm；
Step 2: hot-roll annealing：
The black volume of hot rolling carries out bell-type annealing, soaking time 12-16h under the conditions of 840-860 DEG C；840-860 DEG C of annealing temperature be
Carried out in austenite and ferrite two-phase section, can effectively eliminate martensite, hot rolling band tissue makes it fully recrystallize；
Step 3: hot line pickling：
Pickling is carried out to the stainless-steel roll using the continuous acid-washing technique of the pre- pickling of scale breading-ball blast-sulfuric acid-nitration mixture pickling,
Nitration mixture pickling stages HF concentration 5-15g/l, HNO3Concentration 30-70g/l；This step mainly removes iron scale, because of its geneva
Relatively low black 70-90 μm of the volume iron scale thickness of body stainless steel chromium content, and 304 black volume iron scale thickness are 20-30 μm, so
Martensitic stain less steel pickling is relatively difficult；
Step 4: rolling：
The coil of strip that step 3 obtains is rolled into 2-5 passages through 20 roller mills, is rolling to target thickness, rolling reduction ratio control exists
15-45%；Plate shape is mainly controlled using less passes, avoids occurring to scratch defect, post-processing hardening is rolled in reduction ratio control
Hardness degree, the too high degreasing for being unfavorable for the later stage of hardness and annealing；
Step 5: degreasing：
The coil of strip that step 4 obtains degreasing unit degreasing, degreasing unit carry out degreasing using 80-100 DEG C of hot water；After support
Hard state surface is rolled to light；20 roller mills roll the rolled oil covering in rear coil of strip surface, do not use degreasing or degreasing not to exist totally
A large amount of oil gas can be produced in later process bell furnace, cause surface to produce serious chromatic aberration defect, more serious meeting causes bell-type
Stove fire calamity or explosion accident occur.Degreasing water temperature is more high more is beneficial to degreasing, and improves speed of production, and water temperature is too low to be caused to take off
Fat speed step-down or degreasing be not net；
Step 6: bell-type annealing：
A, the coil of strip for first obtaining step 5 is heated to 450-550 DEG C by room temperature；This stage to heat at full speed, can effectively remove and add
Work is hardened；
B, again from 450-550 DEG C of constant-speed heating to 720-800 DEG C, heat time 6-8h；The coil of strip heart can be effectively ensured in this stage
The temperature of portion and outer ring is uniform, ensures stable mechanical property；
C, annealed under the conditions of 720-800 DEG C, soaking time 8-14h；It is abundant that crystallization can be effectively ensured in this stage；
D, steel roll temperature is cooled to come out of the stove less than 150-200 DEG C；This stage is the Slow cooling stage, avoid produce cooling stress and
Surface oxidation；
Step 7: shearing packaging：Coil of strip after the bell-type annealing packaging and storage after rewinding packing paper.
In order to further realize the present invention, it is 3.5mm that step 1 light plate base, which is hot-rolled down to thickness,.
In order to further realize the present invention, annealing temperature is 850 DEG C in step 2, is incubated 14h.
In order to further realize the present invention, coil of strip rolls 3 passages, target thickness 2.0mm in step 4.
In order to further realize the present invention, step A is heated to 550 DEG C in step 6.
In order to further realize the present invention, step B is heated to 760 DEG C in step 6, heat time 6h.
In order to further realize the present invention, step C annealing temperature is 760 DEG C in step 6, is incubated 10h.
In order to further realize the present invention, annealed in step 6 and use inert gas shielding bell furnace.
Having the beneficial effect that compared to prior art of the invention：
1st, compared with conventional 2D production equipments, bell-type annealing furnace apparatus is simple, floor space is small, equipment cost is low, easy to operate, raw
Production method is simple, it is easy to accomplish.
2nd, the advantage of bell type annealing furnace, there is the advantages such as production cost is low and environmentally friendly, the coal gas and hydrogen that bell furnace uses
It is process by the flue gas reclaimed in coking, and has protective gas not produce iron scale in annealing process, is not had to
Carry out ball blast and pickling processes.And it is to consume the new energy can also produce oxidation that conventional 2D surface productions, which will pass through heated by natural gas,
Iron sheet, iron scale can produce substantial amounts of dust polluting environment by Shot Blasting, be handled after ball blast through overpickling and produce pickling
Smog and sewage, environment is seriously polluted containing nitrogen oxides in smog, contains high volence metal ion and acid solution residue in sewage
Deng, it is impossible to directly discharge, increase cost of sewage disposal of knowing clearly.
3rd, martensite be because it can produce martensitic traoformation after High-temperature cooling, so when producing 2D plate surfaces through cold line,
Martensite is produced after being welded between volume and volume, hard and crisp production accident, the broken belt accidents such as broken belt of easily occurring of martensite is typically located
The reason time is 7-10h, that is, the risk for adding device damage has a strong impact on production efficiency again.And cover annealing is entire volume annealing
In the absence of welding, the production accidents such as broken belt are also just not present.
4th, using the martensite metal surface after bell-type annealing, anaerobic is residual, pickling is bad, aberration and rough surface etc. lack
Fall into, the advantages that metallochrome distinctness.And conventional 2D production technologies are frequently present of oxygen incompleteness and fallen into, pickling again is also carried out, that is, is added
Cost adds environmental pollution again.And the defects of pickling is bad, aberration have a strong impact on surface quality add product degradation and
Retention rate.Rough surface defect after pickling be present, rough surface is serious because the relatively low antioxygenic property of its chromium content is poor in martensite steel
Appearance is influenceed, influences the deep shaping property of client, roughness drops to 0.08 μm or so from 0.15 μm compared with common process.
5th, bell furnace production technology, without stress so abundant with recrystallization because of its Slow cooling, elongation percentage and deep-draw
The advantages that performance is good.Conventional 2D plate surfaces use water cooling, because stress comparatively fast be present in its cooling rate, so elongation percentage and deep drawability compared with
Difference.
Embodiment
With reference to embodiment, the present invention will be further described.
Embodiment 1：A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, comprises the following steps：
Step 1: raw material hot rolling：
Use pure plate slab hot rolling to thickness for 3.0mm；
Step 2: hot-roll annealing：
The black volume of hot rolling carries out bell-type annealing, soaking time 12h under the conditions of 840 DEG C；
Step 3: hot line pickling：
Pickling is carried out to the stainless-steel roll using the continuous acid-washing technique of the pre- pickling of scale breading-ball blast-sulfuric acid-nitration mixture pickling,
Nitration mixture pickling stages HF concentration 5g/l, HNO3Concentration 30g/l, concentration of metal ions is in below 50g/l；
Step 4: rolling：
The coil of strip that step 3 obtains is rolled into 2 passages through 20 roller mills, is rolling to target thickness 2.0mm, rolling reduction ratio control
15%；
Step 5: degreasing：
The coil of strip that step 4 obtains degreasing unit degreasing, degreasing unit carry out degreasing using 80 DEG C of hot water；Light is obtained after support
Bright rolls hard state surface；
Step 6: bell-type annealing：
A, using inert gas shielding bell furnace, the coil of strip that step 5 obtains first is heated to 450 DEG C by room temperature；
B, again from 450 DEG C of constant-speed heatings to 720 DEG C, heat time 6h；
C, annealed under the conditions of 720 DEG C, soaking time 8h；
D, steel roll temperature is cooled to come out of the stove less than 1500 DEG C.
Step 7: shearing packaging：Coil of strip after the bell-type annealing packaging and storage after rewinding packing paper；
The strip that the present embodiment makes has surface-brightening, plasticity height, rolls production Thin Specs cutter beneficial to changing.
Embodiment 2：A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, comprises the following steps：
Step 1: raw material hot rolling：
Use pure plate slab hot rolling to thickness for 6.0mm；
Step 2: hot-roll annealing：
The black volume of hot rolling carries out bell-type annealing, soaking time 16h under the conditions of 860 DEG C；
Step 3: hot line pickling：
Pickling is carried out to the stainless-steel roll using the continuous acid-washing technique of the pre- pickling of scale breading-ball blast-sulfuric acid-nitration mixture pickling,
Nitration mixture pickling stages HF concentration 15g/l, HNO3Concentration 70g/l, concentration of metal ions is in below 50g/l；
Step 4: rolling：
The coil of strip that step 3 obtains is rolled into 5 passages through 20 roller mills, is rolling to target thickness 2.0mm, rolling reduction ratio control
45%；
Step 5: degreasing：
The coil of strip that step 4 obtains degreasing unit degreasing, degreasing unit carry out degreasing using 100 DEG C of hot water；Light is obtained after support
Bright rolls hard state surface；
Step 6: bell-type annealing：
A, using inert gas shielding bell furnace, the coil of strip that step 5 obtains first is heated to 550 DEG C by room temperature；
B, again from 550 DEG C of constant-speed heatings to 800 DEG C, heat time 8h；
C, annealed under the conditions of 800 DEG C, soaking time 14h；；
D, steel roll temperature is cooled to come out of the stove less than 200 DEG C；
Step 7: shearing packaging：Coil of strip after the bell-type annealing packaging and storage after rewinding packing paper.
The strip that the present embodiment makes has the characteristics of toughness height, surface-brightening, high quenching hardness.
Embodiment 3：A kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, comprises the following steps：
Step 1: raw material hot rolling：
Use pure plate slab hot rolling to thickness for 3.5mm；
Step 2: hot-roll annealing：
The black volume of hot rolling carries out bell-type annealing, soaking time 14h under the conditions of 850 DEG C；
Step 3: hot line pickling：
Pickling is carried out to the stainless-steel roll using the continuous acid-washing technique of the pre- pickling of scale breading-ball blast-sulfuric acid-nitration mixture pickling,
Nitration mixture pickling stages HF concentration 10g/l, HNO3Concentration 50g/l, concentration of metal ions is in below 50g/l；
Step 4: rolling：
The coil of strip that step 3 obtains is rolled into 3 passages through 20 roller mills, is rolling to target thickness, rolling reduction ratio control is 30%；
Step 5: degreasing：
The coil of strip that step 4 obtains degreasing unit degreasing, degreasing unit carry out degreasing using 90 DEG C of hot water；Light is obtained after support
Bright rolls hard state surface；
Step 6: bell-type annealing：
A, using argon protecting cover formula stove, the coil of strip that step 5 obtains first is heated to 550 DEG C by room temperature；
B, again from 550 DEG C of constant-speed heatings to 760 DEG C, heat time 6h；
C, annealed under the conditions of 760 DEG C, soaking time 10h；
D, steel roll temperature is cooled to come out of the stove less than 200 DEG C；
Step 7: shearing packaging：Coil of strip after the bell-type annealing packaging and storage after rewinding packing paper.
The strip that the present embodiment makes has surface-brightening, plasticity high, is ground beneficial to slitting, shaping and Surface Machining and surface
Mill.
Claims (8)
1. a kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel, it is characterised in that comprise the following steps：
Step 1: raw material hot rolling：
Use pure plate slab hot rolling to thickness for 3.0-6.0mm；
Step 2: hot-roll annealing：
The black volume of hot rolling carries out bell-type annealing, soaking time 12-16h under the conditions of 840-860 DEG C；
Step 3: hot line pickling：
Pickling is carried out to the stainless-steel roll using the continuous acid-washing technique of the pre- pickling of scale breading-ball blast-sulfuric acid-nitration mixture pickling,
Nitration mixture pickling stages HF concentration 5-15g/l, HNO3Concentration 30-70g/l；
Step 4: rolling：
The coil of strip that step 3 obtains is rolled into 2-5 passages through 20 roller mills, is rolling to target thickness, rolling reduction ratio control exists
15-45%；
Step 5: degreasing：
The coil of strip that step 4 obtains degreasing unit degreasing, degreasing unit carry out degreasing using 80-100 DEG C of hot water；After support
Hard state surface is rolled to light；
Step 6: bell-type annealing：
A, the coil of strip for first obtaining step 5 is heated to 450-550 DEG C by room temperature；
B, again from 450-550 DEG C of constant-speed heating to 720-800 DEG C, heat time 6-8h；
C, annealed under the conditions of 720-800 DEG C, soaking time 8-14h；
D, steel roll temperature is cooled to come out of the stove less than 150-200 DEG C；
Step 7: shearing packaging：Coil of strip after the bell-type annealing packaging and storage after rewinding packing paper.
A kind of 2. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 1, it is characterised in that：Step
It is 3.5mm that plate slab described in rapid one, which is hot-rolled down to thickness,.
3. a kind of annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 1 or 2, its feature exist
In：Annealing temperature described in step 2 is 850 DEG C, is incubated 14h.
A kind of 4. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 3, it is characterised in that：Step
Coil of strip described in rapid four rolls 3 passages, target thickness 2.0mm.
A kind of 5. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 4, it is characterised in that：Step
Step A is heated to 550 DEG C described in rapid six.
A kind of 6. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 5, it is characterised in that：Step
760 DEG C are heated in rapid six described in step B, heat time 6h.
A kind of 7. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 6, it is characterised in that：Step
Annealing temperature described in step C is 760 DEG C in rapid six, is incubated 10h.
A kind of 8. annealing process of martensitic stainless steel for cutting tool cold-strip steel as claimed in claim 7, it is characterised in that：Step
Annealing uses inert gas shielding bell furnace described in rapid six.
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| CN110129547A (en) * | 2019-06-12 | 2019-08-16 | 山西太钢不锈钢精密带钢有限公司 | The bell furnace heat treatment method of ultra-thin stainless steel band |
| CN110964893A (en) * | 2019-11-18 | 2020-04-07 | 江苏延汉材料科技有限公司 | Controlled rolling annealing method for stainless steel for cutter |
| CN111266817A (en) * | 2020-02-17 | 2020-06-12 | 晏榕谦 | Cold rolling method of cutter blank |
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| CN114525391A (en) * | 2022-02-22 | 2022-05-24 | 湖南华菱涟源钢铁有限公司 | Production process of high-carbon tool steel cold-rolled coil |
| CN114657463A (en) * | 2022-03-01 | 2022-06-24 | 湖南华菱涟钢特种新材料有限公司 | 550 MPa-grade high-strength steel and preparation method thereof |
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