CN104745787B - Production method of tool steel capable of being directly cold rolled - Google Patents
Production method of tool steel capable of being directly cold rolled Download PDFInfo
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Abstract
The invention provides a production method of tool steel capable of being directly cold rolled. The production method of the tool steel capable of being directly cold rolled comprises the following steps: heating a casting blank, and descaling with high pressure water; carrying out rough rolling; descaling with the high pressure water before precision rolling is carried out; carrying out precision rolling; carrying out laminar cooling; coiling; tempering; and straightening and then carrying out cold rolling. The production method of the tool steel capable of being directly cold rolled has the advantages that plasticity and toughness are good, a spheroidizing annealing operation does not need to be carried out while usability of tool steel is guaranteed, cold rolling can be directly carried out after hot rolling is finished, and a production cycle is shortened for at least 7 hours; a metallographic structure of the produced tool steel is annealed and changed into a tempered sorbite with uniform carbide, so that the spheroidizing annealing operation before cold rolling can be eliminated; and resource consumption and pollution to the environment can be reduced.
Description
Technical field
The present invention relates to a kind of production method of tool steel, specifically belongs to a kind of production of the tool steel of energy direct cold rolling
Method.
Background technology
Tool steel has the performances such as good intensity, toughness, hardness, wearability and temper resistance, mainly for the manufacture of
Various cutting tools, forming tool and survey tool.When cutter, measurer is made, it is desirable to which the thickness of steel band used by which is most thin to be reached
To 0.01mm, and hot rolled strip is most thin is only capable of reaching 2mm, needs Jing cold rolling and realizes.
For at present, in tool steel carbon content be generally higher than the tissue after 0.7%, and its hot rolling be generally pearlite or
Pearlite+bulk cementite, although its intensity, hardness are high, modeling, toughness are poor.It is poor for solution modeling, toughness, and reduce heat
The rolling load in tool steel cold-rolled process is rolled, to avoid the problem of cracking, crackle in the operation of rolling, people Jing from studying,
Spheroidizing operation will be carried out before cold rolling, to change the pattern of carbide and distribution in steel, obtain being distributed on ferrite matrix
The globular pearlite of granular carbide.Though problem has been solved, the spheroidizing activity time is long, i.e., be typically not less than 10
The process time of individual hour, and also when there is hot rolled coil and annealing in bell type annealing furnace, due to steel roll temperature skewness,
Frequently result in the uneven microstructure for finally giving.
Jing is retrieved, a kind of method for manufacturing spheroidizing-free high-quality high-strength cold forging steel (publication number：CN102676929A it is) right
Existing cooling controlling and rolling controlling process is set, and controls 900～1120 DEG C of slab heating temperature, 720～850 DEG C of finishing temperature, spinning
800～860 DEG C of temperature, enters cover after being cooled to 650～800 DEG C with 3～8 DEG C/s cooling rates, in cover, cooling rate is 0.2～0.7 DEG C/s,
What is obtained is organized as tiny sheet pearlite, and it is thinning microstructure size that the document exempts from the control method of spheroidizing, but is obtained
The plasticity and toughness of the flaky carbide in the pearlite for obtaining are poorer than granular carbide；A kind of online nodularization rolling mill practice of medium carbon steel
（CN100999775A）Controlled rolling and controlled cooling zerolling technique, rolling temperature is adopted to control 680～850 in the finish-rolling process stage
DEG C, the deflection in section is accumulative draft 50%～80%, controls rate of cooling after zerolling, make rolled parts with 3 DEG C/
Second～15 DEG C/sec of rate of cooling is cooled to 660～720 DEG C, then through isothermal process, then rolled piece naturally cools to room temperature,
Granular pearlite tissue is obtained, but adopts the technique, the rolling load in finish rolling stage is larger, be unfavorable for Strip Shape Control, and due to
Rolling temperature is too low, is likely to result in the mixed crystal phenomenon of deformed grains and not deformed crystal grain.
The content of the invention
The present invention is in view of the shortcomings of the prior art, there is provided a kind of on the premise of tool steel performance is met, nothing
Spheroidizing operation need to be carried out, energy direct cold rolling after hot rolling, the producer of the tool steel of the energy direct cold rolling that the production cycle shortens
Method.
Realize the measure of above-mentioned purpose：
A kind of production method of the tool steel of energy direct cold rolling, its step：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating and temperature control be 1150 ~
1250℃；
2）Roughing is carried out routinely；
3）Carry out the high-pressure water descaling before finish rolling；
4）Carry out finish rolling, control its finishing temperature at 800 ~ 900 DEG C, and control last frame steel belt operating speed 10 ~
20m/s；
5）Section cooling is carried out, is, under 30 ~ 50 DEG C/s, to be cooled to coiling temperature in rate of cooling；
6）Batched, coiling temperature is in Ms+30 ~ 100 DEG C；
7）Temper is carried out, temperature is 550 ~ 700 DEG C, and control heating and temperature retention time are in 2 ~ 3 hours；Metallographic
It is organized as tempered sorbite tissue；
8）Carry out Jing after aligning conventional cold rolling.
Further, temperature is controlled at 600 ~ 700 DEG C, tempering time is 2 ~ 2.5 hours.
Further, temperature is controlled at 650 ~ 700 DEG C, tempering time is 2 ~ 2.3 hours.
The effect of main technique control of the present invention：
Why rate of cooling is controlled, under 30 ~ 50 DEG C/s, to be cooled to coiling temperature by the present invention in the section cooling stage
Ms+30 ~ 100 DEG C, are found due to experiment, and which is avoided that austenite is changed into lamellar pearlite, and difficult to understand in coiling process
There is martensite transfor mation in family name's body under stress induced effect, volumetric expansion during the absorbable martensite transfor mation of retained austenite is produced
Raw impact, it is to avoid tool steel ftractures.When the dislocation and the defect such as twin that martensitic phase transformation is produced is high tempering martensite and
The decomposition of retained austenite provides energy, contributes to distribution of carbides uniform.
Why the present invention carries out temper, and controls temperature for 550 ~ 700 DEG C, and control is heated and temperature retention time
In 2 ~ 3 hours, it is to decompose martensite and retained austenite due to tempering, forms tempered sorbite group Jing after recovery and recrystallization
Knit, be conducive to ferritic reply and carbide to grow up, can further reduce instrument hardness of steel, improve plasticity, make plasticity and toughness excellent
It is good, and resistance of deformation when reducing cold rolling.Additionally, the control of tempering time is also beneficial to control the decarburization of tool steel, promote work
The raising of tool steel fatigue life.
The present invention why control finishing temperature at 800 ~ 900 DEG C, it is therefore intended that for obtain tiny, intra-die dislocation compared with
High austenite crystal, to promote martensite to be more easy to decompose in drawing process.
Compared with prior art, plasticity and toughness are excellent, and on the premise of tool steel performance is met, need not enter for the present invention
Row spheroidizing operation, energy direct cold rolling after hot rolling, production cycle shorten at least 7 hours；Due to the tool steel that produced
It is changed into the uniform tempered sorbite of carbide after metallographic structure is tempered, cold rolling front spheroidizing operation can be saved；Can reduce
The pollution of consumption and environment to resource.
Description of the drawings
Accompanying drawing is the metallographic structure figure of the present invention.
Specific embodiment
Below the present invention is described in detail：
It should be noted that following embodiment tool steel not with the technological parameter value selected by which be corresponding relation, its
Can any value in the claim limited range.
Embodiment 1
The present embodiment production for carbon tool steel T8, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1151 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 803 DEG C, last frame steel belt operating speed is in 10.5m/s for its finishing temperature；
5）Section cooling is carried out, is, under 35 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 270
℃ ；
6）Batched, coiling temperature is Ms+52 DEG C=322 DEG C；
7）Temper is carried out, temperature is 552 ~ 557 DEG C, it is 3 hours to control heating and temperature retention time；It is tempered
Afterwards, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 550Mpa, hardness 172HV, elongation percentage 28%；Production
Cycle：Original production this steel grade spheroidizing time needs 14 hours, the present embodiment to be tempered only with 3 hours, makes the production cycle
Shorten 11 hours.
Embodiment 2
The present embodiment production for alloy tool steel 9SiCr, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1247 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 843 ~ 849 DEG C, last frame steel belt operating speed is in 13m/s for its finishing temperature；
5）Section cooling is carried out, is, under 30 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 230
℃；
6）Batched, coiling temperature is Ms+32 DEG C=262 DEG C；
7）Temper is carried out, temperature is 699 DEG C, it is 2.2 hours to control heating and temperature retention time；It is tempered
Afterwards, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 670Mpa, hardness 210HV, elongation percentage 25%；Production
Cycle：Original production this steel grade spheroidizing time needs 12 hours, the present embodiment tempering only with 2.2 hours, to make production week
Phase shortens 9.8 hours.
Embodiment 3
The present embodiment production for carbon tool steel T9, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1203 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 896 ~ 900 DEG C, last frame steel belt operating speed is in 15m/s for its finishing temperature；
5）Section cooling is carried out, is, under 40 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 235
℃ ；
6）Batched, coiling temperature is Ms+76 DEG C=311 DEG C；
7）Temper is carried out, temperature is 616 ~ 619 DEG C, it is 2.5 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 580Mpa, hardness 181HV, elongation percentage 23%；Production
Cycle：Original production this steel grade spheroidizing time needs 11 hours, the present embodiment tempering only with 2.5 hours, to make production week
Phase shortens 9.5 hours.
Embodiment 4
The present embodiment production for alloy tool steel 75Cr1, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1240 ~ 1249 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 872 ~ 881 DEG C, last frame steel belt operating speed is in 18m/s for its finishing temperature；
5）Section cooling is carried out, is, under 35 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 287
℃ ；
6）Batched, coiling temperature is Ms+76 DEG C=363 DEG C；
7）Temper is carried out, temperature is 656 ~ 661 DEG C, it is 2.4 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 520Mpa, hardness 169HV, elongation percentage 27%；Production
Cycle：Original production this steel grade spheroidizing time needs 11 hours, the present embodiment tempering only with 2.4 hours, to make production week
Phase shortens 8.6 hours.
Embodiment 5
The present embodiment production for alloy tool steel T10, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1212 ~ 1219 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 832 ~ 837 DEG C, last frame steel belt operating speed is in 20m/s for its finishing temperature；
5）Section cooling is carried out, is, under 50 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 200
℃ ；
6）Batched, coiling temperature is Ms+100 DEG C=300 DEG C；
7）Temper is carried out, temperature is 686 ~ 692 DEG C, it is 2.2 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 600Mpa, hardness 180HV, elongation percentage 29%；Production
Cycle：Original production this steel grade spheroidizing time needs 15 hours, the present embodiment tempering only with 2.2 hours, to make production week
Phase shortens 12.8 hours.
Embodiment 6
The present embodiment production for alloy tool steel 8MnSi, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1179 ~ 1186 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 883 ~ 892 DEG C, last frame steel belt operating speed is in 15m/s for its finishing temperature；
5）Section cooling is carried out, is, under 37 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 267
℃ ；
6）Batched, coiling temperature is Ms+63 DEG C=300 DEG C；
7）Temper is carried out, temperature is 667 ~ 673 DEG C, it is 2.7 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 551Mpa, hardness 168HV, elongation percentage 22%；Production
Cycle：Original production this steel grade spheroidizing time needs 12 hours, the present embodiment to be tempered only with 2 hours, makes the production cycle
Shorten 10 hours.
Embodiment 7
The present embodiment production for alloy tool steel 9Mn2V, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1219 ~ 1227 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 816 ~ 825 DEG C, last frame steel belt operating speed is in 10m/s for its finishing temperature；
5）Section cooling is carried out, is, under 30 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 232
℃ ；
6）Batched, coiling temperature is Ms+31 DEG C=263 DEG C；
7）Temper is carried out, temperature is 598 ~ 607 DEG C, it is 2.8 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 620Mpa, hardness 185HV, elongation percentage 19%；Production
Cycle：Original production this steel grade spheroidizing time needs 15 hours, the present embodiment tempering only with 2.8 hours, to make production week
Phase shortens 12.2 hours.
Embodiment 8
The present embodiment production for alloy tool steel 5CrMo, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1178 ~ 1189 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 866 ~ 876 DEG C, last frame steel belt operating speed is in 14m/s for its finishing temperature；
5）Section cooling is carried out, is, under 37 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 340
℃ ；
6）Batched, coiling temperature is Ms+49 DEG C=389 DEG C；
7）Temper is carried out, temperature is 637 ~ 646 DEG C, it is 2.7 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 519Mpa, hardness 152HV, elongation percentage 29%；Production
Cycle：Original production this steel grade spheroidizing time needs 11 hours, the present embodiment tempering only with 2.7 hours, to make production week
Phase shortens 8.3 hours.
Embodiment 9
The present embodiment production for carbon tool steel T8, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1161 ~ 1172 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 824 ~ 831 DEG C, last frame steel belt operating speed is in 12m/s for its finishing temperature；
5）Section cooling is carried out, is, under 37 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 270
℃ ；
6）Batched, coiling temperature is Ms+56 DEG C=326 DEG C；
7）Temper is carried out, temperature is 689 ~ 697 DEG C, it is 2.1 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 521Mpa, hardness 159HV, elongation percentage 30%；Production
Cycle：Original production this steel grade spheroidizing time needs 14 hours, the present embodiment tempering only with 2.1 hours, to make production week
Phase shortens 11.9 hours.
Embodiment 10
The present embodiment production for alloy tool steel 9Mn2V, its production stage：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating-up temperature is at 1237 ~ 1243 DEG C；
2）Roughing is carried out routinely；
3）The high-pressure water descaling before finish rolling is carried out, removes the iron scale of surface of steel plate clean；
4）Finish rolling is carried out, at 856 ~ 863 DEG C, last frame steel belt operating speed is in 13m/s for its finishing temperature；
5）Section cooling is carried out, is, under 34 DEG C/s, to be cooled to coiling temperature in rate of cooling；The Ms of this tool steel is 232
℃ ；
6）Batched, coiling temperature is Ms+61 DEG C=293 DEG C；
7）Temper is carried out, temperature is 641 ~ 647 DEG C, it is 2.4 hours to control heating and temperature retention time；Jing is returned
After fire, metallographic structure is organized for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
After testing, the mechanical property of the present embodiment steel is：Tensile strength 601Mpa, hardness 175HV, elongation percentage 22%；Production
Cycle：Original production this steel grade spheroidizing time needs 15 hours, the present embodiment tempering only with 2.4 hours, to make production week
Phase shortens 12.8 hours.
This specific embodiment is only most preferably enumerated, not the restricted enforcement to technical solution of the present invention.
Claims (3)
1. it is a kind of can direct cold rolling tool steel production method, its step：
1）Strand is carried out after conventional heating, carry out the high-pressure water descaling before roughing；Heating and temperature control is 1150 ~ 1250 DEG C；
2）Roughing is carried out routinely；
3）Carry out the high-pressure water descaling before finish rolling；
4）Finish rolling is carried out, its finishing temperature is controlled at 800 ~ 866 DEG C, and control last frame steel belt operating speed in 10 ~ 20m/s；
5）Section cooling is carried out, is, under 30 ~ 50 DEG C/s, to be cooled to coiling temperature in rate of cooling；
6）Batched, coiling temperature is in Ms+30 ~ 100 DEG C；
7）Temper is carried out, temperature is 550 ~ 700 DEG C, and control heating and temperature retention time are in 2 ~ 3 hours；Metallographic structure
Organize for tempered sorbite；
8）Carry out Jing after aligning conventional cold rolling.
2. it is as claimed in claim 1 it is a kind of can direct cold rolling tool steel production method, it is characterised in that：Control tempering temperature
Spend for 600 ~ 700 DEG C, tempering time is 2 ~ 2.5 hours.
3. it is as claimed in claim 1 or 2 it is a kind of can direct cold rolling tool steel production method, it is characterised in that：Control back
At 650 ~ 700 DEG C, tempering time is 2 ~ 2.3 hours to fiery temperature.
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| CN106424193B (en) * | 2016-09-21 | 2018-08-03 | 唐山国丰钢铁有限公司 | Hypereutectoid spheroidizing pearlite hot-strip production method |
| CN110616303A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Manufacturing method of 980MPa grade or above cold-rolled or galvanized dual-phase steel plate |
| CN109513744A (en) * | 2018-11-02 | 2019-03-26 | 北京首钢股份有限公司 | A kind of high carbon tool steel hot-rolling method |
| CN110106322B (en) * | 2019-05-22 | 2021-03-02 | 武汉钢铁有限公司 | High-strength steel for thin engineering machinery and plate shape control method |
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| US4140524A (en) * | 1974-02-04 | 1979-02-20 | Carpenter Technology Corporation | Low alloy band saw steel and method of making the same |
| JPS5486422A (en) * | 1977-12-21 | 1979-07-10 | Kubota Ltd | Cast alloy for composite roll shell |
| US5651938A (en) * | 1995-05-01 | 1997-07-29 | Blount, Inc. | High strength steel composition having enhanced low temperature toughness |
| CN101618396B (en) * | 2008-06-30 | 2011-01-19 | 上海梅山钢铁股份有限公司 | Method for rolling interstitial free steel ferrite on traditional hot rolling mills |
| CN101358319B (en) * | 2008-09-02 | 2010-12-01 | 首钢总公司 | Low carbonaceous steel plate for 610MPa grade high strength pressure vessels and production method thereof |
| CN102134681B (en) * | 2010-01-22 | 2013-02-06 | 宝山钢铁股份有限公司 | Steel for saw blade substrate and manufacturing method thereof |
| CN102247985B (en) * | 2011-07-01 | 2013-06-26 | 河北省首钢迁安钢铁有限责任公司 | Method for producing steel for stirring tank with limit specification through hot rolling |
| CN102671992A (en) * | 2012-05-29 | 2012-09-19 | 东北大学 | Method for making easy-to-pickle steel plate |
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