CN102703803B - Globular pearlite type hot rolled coil and production method thereof - Google Patents

Globular pearlite type hot rolled coil and production method thereof Download PDF

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Publication number
CN102703803B
CN102703803B CN201210129464.3A CN201210129464A CN102703803B CN 102703803 B CN102703803 B CN 102703803B CN 201210129464 A CN201210129464 A CN 201210129464A CN 102703803 B CN102703803 B CN 102703803B
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cooling
rolled coil
hot
pearlite
temperature
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CN102703803A (en
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杨才定
张汉谦
张涛
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

Disclosed are a globular pearlite type hot rolled coil and a production method thereof. The globular pearlite type hot rolled coil comprises, by weight, 0.30-0.77% of C, 0.10-2.0% of Mn, 0.05-0.50% of Si, not more than 0.01% of S, not more than 0.02% of P, more than one of Cr, Ni and Mo, the balance of Fe and unavoidable impurities, wherein the Cr is not more than 1.5%, the Ni is not more than 1.0%, and the Mo is not more than 0.50%. Globular and rod-like pearlite more than 80% can be obtained by common rolling process and coiling process, extra annealing equipment is not needed, and the production method is energy-saving and environment-friendly.

Description

A kind of globular pearlite type hot-rolled coil and production method thereof
Technical field
The present invention relates to hot-rolled coil and production method thereof, particularly a kind of globular pearlite type hot-rolled coil and production method thereof.
Background technology
Carbon content is at more than 0.30% medium and high carbon steel or steel alloy, the tissue of hot-rolled steel sheet is generally ferrite and pearlite tissue, perlite existence due to sheet, the punching performance of steel plate is declined, in common situation, must first the perlite of sheet be carried out to Spheroidizing Annealing processing, obtain globular pearlite, thereby make steel plate there is good plasticity and punching performance.
The object of Spheroidizing Annealing process of agglomeration slowly again after being to make sheet perlite to dissolve, need to be incubated for a long time, and required time of Spheroidizing Annealing and Morphology of pearlite and the quantity under temperature and hot-rolled state have close relationship.
As Japanese Patent JP2003183775A discloses a kind of manufacture of cold rolling feeds, C content is 0.05 ~ 0.40%, after hot rolling, to be greater than the cooling rate of 30 ℃/s, to be cooled to 500 ℃ and to batch, by control, rolling rear speed of cooling controls and rolls state and organize, then steel plate is reheated to 550 ~ 700 ℃ and carry out Spheroidizing Annealing, obtain equally distributed spheroidite.
Japanese Patent JP2000045029A, this patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability, after roughing, more than Ar3, complete rolling, steel plate obtains the spheroidite that is greater than 80% after spheroidizing, carry out again deflection be greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600 ~ Ac1 is less than 1.5 and long-width ratio≤1.3 of ferrite crystal grain.This technique has obtained desirable globular structure by twice Spheroidizing Annealing.
Except above-mentioned publication, Japanese Patent JP11061272A, JP08120405A, JP59205417A, JP59013024A, from different technological angles, have set forth and have needed through off-line carbide annealing process.
Summary of the invention
The object of the present invention is to provide a kind of globular pearlite type hot-rolled coil and production method thereof, utilize common rolling technology and coiling technique just can obtain more than 80% spherical and corynebacterium pearlitic structure, without additional annealing equipment, it is a kind of energy saving and environment friendly production technique.
For achieving the above object, technical scheme of the present invention is:
A globular pearlite type hot-rolled coil, its chemical component weight per-cent is: C 0.30~0.77%, Mn 0.10~2.0%, Si 0.05 ~ 0.50%, S≤0.01%, P≤0.02%, V≤0.50%, B≤0.010%, also comprise in Cr, Ni, Mo more than one, Cr≤1.5%, Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity.
Further, also comprise containing in V, B more than one, V≤0.50%, B≤0.010%, weight percent meter.
In composition of steel design of the present invention:
C: be strengthening element most economical, the most basic in steel, have obvious effect by solution strengthening and precipitation strength to improving the intensity of steel, but improving C content have negative impact to the plasticity of steel, toughness and weldability.In order to obtain a certain proportion of perlite, carbon content is selected the higher part of carbon content in hypoeutectoid steel, and scope is 0.30~0.77%.
Si: silicon is little to the stability influence of supercooled austenite.Silicon plays solution strengthening effect in steel, and content can suppress separating out of carbide when more, improves toughness.In steel, add silicon and can improve purity of steel and play desoxydatoin, scope is 0.05~0.50%.
Mn: manganese improves stabilization of austenite and reduces austenite phase transformation temperature, and manganese is weak carbide forming element, in steel, the main solution strengthening effect that rises, is conducive to improve austenitic transformation tissue intensity.Manganese in steel is easy to sulphur in conjunction with forming MnS, avoids occurring in steel low-temperature phase FeS, prevents from occurring in course of hot rolling decrepitation, span of the present invention: 0.10~2.0%.
S and P: sulphur forms plastic occluded foreignsubstance manganese sulfide with the chemical combination such as manganese in steel, along rolling direction tensile deformation, especially unfavorable to the horizontal plastic property of steel and toughness in the operation of rolling.Therefore the content of sulphur should be low as much as possible.Phosphorus is also the harmful element in steel, the plasticity of grievous injury steel plate and toughness.During smelting, reduce sulphur, phosphorus content as far as possible, improve steel purity.
Cr and Mo: chromium is mainly used to postpone the austenitic transformation incubation time in steel, improve hardening capacity, makes to move after ferrite, perlitic transformation, suppresses such tissue and form in process of cooling, makes steel in the situation that cooling rate is not high, directly enter martensitic transformation district.Molybdenum is the element in every other alloying element, hardening capacity being had the greatest impact, and significantly postpones perlitic transformation.
Ni: nickel solid solution, in ferrite, is significantly improved the toughness of matrix.
B: add in right amount boron can significantly improve the stability of supercooled austenite in steel, but along with the increase of carbon content, the effect of boron reduces gradually.
The production method of globular pearlite type hot-rolled coil of the present invention, comprises the steps:
A) smelt, cast
Hot-rolled coil chemical component weight per-cent is: C 0.30~0.77%, and Mn 0.10~2.0%, and Si 0.05~0.50%, S≤0.01%, P≤0.02%, also comprises in Cr, Ni, Mo more than one, Cr≤1.5%, Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity;
By mentioned component, smelt, be cast as slab;
B) hot rolling
Heating of plate blank, board briquette: 1100~1300 ℃; Finish rolling final temperature: 800~950 ℃;
C) laminar flow is cooling
Take laminar flow cooling, cooling rate is 10 ~ 25 ℃/s, and final cooling temperature is 600~750 ℃;
D) batch
Coiling temperature: 600~750 ℃;
E) finished steel coils is cooling
After having batched, take the mode of Slow cooling to carry out cooling, average cooling rate is lower than 50 ℃/h.
Again, in described hot-rolled coil composition, also comprise containing in V, B more than one, V≤0.50%, B≤0.010%, weight percent meter.
The medium high carbon hot-rolled sheet coil that the present invention produces by roughing mill+hot continuous rolling unit with continuously cast bloom, its microstructure is ferrite and pearlite tissue, its Medium pearlite is spherical or corynebacterium form, proportion is higher than 80%, while needing Spheroidizing Annealing as following process, compare with sheet pearlitic structure with traditional ferrite, when carrying out Spheroidizing Annealing, can greatly shorten soaking time, thereby the efficiency of Spheroidizing Annealing operation is improved greatly.
Medium and high carbon steel is due to lower processability, is shaped and adds man-hour carrying out complexity, need to carry out in advance Spheroidizing Annealing processing, and object is to make the perlite of sheet to change into globular pearlite, improves processing characteristics.Tradition medium high carbon hot-rolled coil be organized as ferrite and sheet pearlitic structure, need insulation for a long time to ensure higher nodularization rate, the hot-rolled sheet coil that the present invention produces can obtain more than 80% globular pearlite, when needing off-line Spheroidizing Annealing to process as following process, owing to containing the globular pearlite of higher proportion, thus the required Spheroidizing Annealing time greatly reduce.The ultimate principle of Spheroidizing Annealing is: steel grade is heated to the two-phase region that austenite and ferrite coexist, make cementite generation part molten disconnected, in process of cooling, at undissolved carbide particle and local high-carbon regions, form carbide core and progressively assemble nodularization subsequently, obtaining globular pearlite tissue.Because hot-rolled coil is from great, between steel plate, batch closely, need long insulation just can be organized uniformly, when As rolled most tissues is globular pearlite, in the situation that shortening soaking time, still can obtain higher nodularization rate, thereby improve the production efficiency of Spheroidizing Annealing.
The medium and high carbon steel of the present invention's design is conventional hot rolling special steel, and intensity rank broad covered area after thermal treatment, can be widely used in all trades and professions.Realization of the present invention is the control based on to hot rolling, process for cooling, utilizes common rolling technology and coiling technique just can meet and organize requirement, without additional annealing equipment, is a kind of energy saving and environment friendly production technique.
The present invention compared with prior art has following difference:
Japanese Patent JP2003183775A, this patent relates to a kind of manufacture of cold rolling feeds, and C content is 0.05 ~ 0.40%, after hot rolling, to be greater than the cooling rate of 30 ℃/s, to be cooled to 500 ℃ and to batch, reheat to 550 ~ 700 ℃ and carry out Spheroidizing Annealing, obtain equally distributed spheroidite.The present invention does not need to reheat and carries out Spheroidizing Annealing, can obtain globular pearlite having batched in being cooled to room temperature process, so both processing routes are different.
Japanese Patent JP2000045029A, this patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability, after roughing, more than Ar3, complete rolling, steel plate obtains the spheroidite that is greater than 80% after spheroidizing, carry out again deflection be greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600 ~ Ac1 is less than 1.5 and long-width ratio≤1.3 of ferrite crystal grain.Compare with the present invention, technique has relatively big difference, and the present invention's employing is batched rear cooling technique and obtained a certain proportion of spheroidite, does not need to carry out specially Spheroidizing Annealing.
Japanese Patent JP08120405A, high carbon steel and production technique thereof that this patent is a kind of reaming performance, suitability for secondary processing is good.Between 750 ~ 900 ℃, complete rolling, between 400 ~ 650 ℃, batch, 600 ~ 720 ℃ of annealing.Different with technique of the present invention, its mode that obtains spheroidite is off-line annealing.
Japanese Patent JP59205417A, the production of the medium and high carbon steel that this patent is a kind of globular structure, the acquisition of its globular structure is to be incubated to Ac1 or following temperature by heating steel plate, and then Slow cooling obtains, and the technique that obtains spherical smooth body from the present invention is different.
Japanese Patent JP59013024A, this patent is a kind of steel manufacture method of direct spheroidizing, this patent requires 50 ℃ of drafts that carry out more than 30% below Ar1 to Ar1, then reheats between Ac1 ~ Ac3 and batches, and Slow cooling makes pearlitic spheroidization.The present invention does not need to reheat, therefore the thinking of Spheroidizing Annealing is different.
Also just like Japanese Patent JP2000045029A, this patent is the method for manufacturing of the high carbon steel of a kind of high ductibility, high hardenability, after roughing, more than Ar3, complete rolling, steel plate obtains the spheroidite that is greater than 80% after spheroidizing, carry out again deflection be greater than 30% cold rolling, the long-width ratio that annealing obtains cementite crystal grain between 600 ~ Ac1 is less than 1.5 and long-width ratio≤1.3 of ferrite crystal grain.Compare with the present invention, technique has relatively big difference, and the present invention's employing is batched rear cooling technique and obtained a certain proportion of spheroidite, does not need to carry out specially Spheroidizing Annealing.
Beneficial effect of the present invention
The present invention utilizes hot continuous rolling to produce line and manufactures ferrite and globular pearlite type hot-rolled sheet coil, substitute traditional Spheroidizing Annealing and obtain the technique that globular pearlite need to reheat, can obtain more than 80% spherical and corynebacterium perlite, this is organized in while carrying out Spheroidizing Annealing, can shorten the Spheroidizing Annealing time, enhance productivity.
Accompanying drawing explanation
Fig. 1 is the metallographic structure of the embodiment of the present invention 2.
Fig. 2 is the metallographic structure of the embodiment of the present invention 8.
Embodiment
Below just and embodiment the present invention will be further described.
Embodiment of the present invention smelting component is as shown in table 1.
Table 1 embodiment chemical composition, wt%
Embodiment C Si Mn P S Cr Ni Mo B V
1 0.30 0.25 0.10 0.010 0.005 1.50 0.15 0.10 -- --
2 0.32 0.05 1.35 0.010 0.002 0.10 -- -- 0.0015 --
3 0.35 0.27 2.00 0.011 0.005 -- 0.56 0.26 0.0020 --
4 0.41 0.25 0.78 0.010 0.003 -- -- 0.20 0.01 --
5 0.50 0.20 1.55 0.009 0.003 0.22 -- -- -- 0.50
6 0.55 0.50 0.68 0.007 0.003 -- 1.0 -- -- --
7 0.65 0.35 1.10 0.008 0.006 -- -- 0.50- -- --
8 0.67 0.25 0.65 0.010 0.002 0.03 -- --
9 0.75 0.25 0.70 0.013 0.005 0.50 -- -- -- --
10 0.77 0.30 0.75 0.008 0.002 0.02 -- -- -- 0.12
Mentioned component embodiment carries out hot rolling, sotck thinkness 250mm, and 1100~1300 ℃ of blank soaking temperatures, enough time is grilled thoroughly and is incubated at assurance blank center makes microstructure homogenization.Rolling immediately after blank insulation finishes, through multi-pass, be rolled to continuously finished product thickness, embodiment hot-rolled sheet finished product thickness 2~10mm, during rolling, controlling finishing temperature scope is 800~950 ℃, after rolling completes, steel plate is sprayed water immediately and is cooled to perlitic transformation region, when temperature is down to 600~750 ℃, batch, after batching, take the mode of slow cooling to be cooled to room temperature.
Rolling and the process for cooling of embodiment are as shown in table 2.
Table 2
From Fig. 1, Fig. 2, can find out, hot rolled strip of the present invention, its structural state is ferrite and pearlite tissue, its Medium pearlite major part is spherical and corynebacterium distribution, the long-width ratio of corynebacterium cementite is less than 5:1, and both are greater than 80% by proportion, is on a small quantity sheet and distributes.
The ferrite having with the hypoeutectoid steel of traditional normalizing rolling is compared with sheet perlite, this type tissue can significantly reduce the Spheroidizing Annealing soaking time of steel grade, and it is the same that nodularization effect is produced with traditional technology, all have compared with high ball rate, adopt the hot rolled strip of this explained hereafter, be suitable for further processing, especially can shorten the Spheroidizing Annealing time, improve the production efficiency of cold rolling special steel band.

Claims (4)

1. a globular pearlite type hot-rolled coil, its chemical component weight per-cent is: C0.30~0.77%, Mn0.10~2.0%, Si0.05~0.50%, S≤0.01%, P≤0.02%, also comprise in Cr, Ni, Mo more than one, Cr≤1.5%, Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity; It is adopted with the following method and obtains:
A) smelt, cast
By mentioned component, smelt, be cast as slab;
B) hot rolling
Heating of plate blank, board briquette: 1100~1300 ℃, 950~1050 ℃ of roughing temperature, finish rolling final temperature: 800~950 ℃;
C) laminar flow is cooling
Take laminar flow cooling, cooling rate is 10~25 ℃/s, and final cooling temperature is 600~750 ℃;
D) batch
Coiling temperature: 600~750 ℃;
E) finished steel coils is cooling
After having batched, take the mode of Slow cooling to carry out cooling, average cooling rate is lower than 50 ℃/h; The microstructure of the Finished Steel obtaining is ferrite and pearlite tissue, and its Medium pearlite is spherical or corynebacterium form, and proportion is higher than 80%.
2. globular pearlite type hot-rolled coil as claimed in claim 1, is characterized in that, also comprise containing in V, B more than one, V≤0.50%, B≤0.010%, weight percent meter.
3. a production method for globular pearlite type hot-rolled coil, comprises the steps:
A) smelt, cast
Hot-rolled coil chemical component weight per-cent is: C0.30~0.77%, Mn0.10~2.0%, Si0.05~0.50%, S≤0.01%, P≤0.02%, also comprises in Cr, Ni, Mo more than one, Cr≤1.5%, Ni≤1.0%, Mo≤0.50%, all the other are Fe and inevitable impurity; By mentioned component, smelt, be cast as slab;
B) hot rolling
Heating of plate blank, board briquette: 1100~1300 ℃, 950~1050 ℃ of roughing temperature, finish rolling final temperature: 800~950 ℃;
C) laminar flow is cooling
Take laminar flow cooling, cooling rate is 10~25 ℃/s, and final cooling temperature is 600~750 ℃;
D) batch
Coiling temperature: 600~750 ℃;
E) finished steel coils is cooling
After having batched, take the mode of Slow cooling to carry out cooling, average cooling rate is lower than 50 ℃/h; The Finished Steel microstructure obtaining is ferrite and pearlite tissue, and its Medium pearlite is spherical or corynebacterium form, and proportion is higher than 80%.
4. the production method of globular pearlite type hot-rolled coil as claimed in claim 3, is characterized in that, in described hot-rolled coil composition, also comprise containing in V, B more than one, V≤0.50%, B≤0.010%, weight percent meter.
CN201210129464.3A 2012-04-27 2012-04-27 Globular pearlite type hot rolled coil and production method thereof Active CN102703803B (en)

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CN106048415B (en) * 2016-07-06 2018-05-22 山东钢铁股份有限公司 A kind of Ni microalloyings stone oil drill collar steel and preparation method thereof
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
CN106591724A (en) * 2016-12-15 2017-04-26 武汉钢铁股份有限公司 Hot-rolled annealed steel plate for cold forming and production method thereof
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CN109266965A (en) * 2018-11-01 2019-01-25 宁波钢铁有限公司 A kind of hot rolled strip and its preparation and application
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CN101845583A (en) * 2009-03-25 2010-09-29 宝山钢铁股份有限公司 Petroleum sleeve steel and manufacturing method thereof

Patent Citations (1)

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CN101845583A (en) * 2009-03-25 2010-09-29 宝山钢铁股份有限公司 Petroleum sleeve steel and manufacturing method thereof

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