KR20170021651A - Apparatus for heat treatment of steel plate - Google Patents

Apparatus for heat treatment of steel plate Download PDF

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Publication number
KR20170021651A
KR20170021651A KR1020150116284A KR20150116284A KR20170021651A KR 20170021651 A KR20170021651 A KR 20170021651A KR 1020150116284 A KR1020150116284 A KR 1020150116284A KR 20150116284 A KR20150116284 A KR 20150116284A KR 20170021651 A KR20170021651 A KR 20170021651A
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KR
South Korea
Prior art keywords
heat treatment
steel sheet
heat
steel plate
treatment unit
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KR1020150116284A
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Korean (ko)
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KR101745351B1 (en
Inventor
김호수
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주식회사 포스코
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Priority to KR1020150116284A priority Critical patent/KR101745351B1/en
Publication of KR20170021651A publication Critical patent/KR20170021651A/en
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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
    • C21D6/00—Heat treatment of ferrous alloys
    • 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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • 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
    • C21D1/34—Methods of heating
    • 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
    • C21D1/34—Methods of heating
    • C21D1/38—Heating by cathodic discharges
    • 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
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • 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
    • 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
    • C21D8/0294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a localised treatment

Abstract

The present invention relates to a heat treatment unit for heat treating a steel sheet so as to have a predetermined pattern on a surface of the steel sheet; And a cooling unit for cooling the steel plate heat-treated by the heat treatment unit, thereby providing an effect of increasing the rigidity of the entire steel plate through the patterned heat treatment pattern of the steel plate.

Description

[0001] Apparatus for heat treatment of steel plate [0002]

The present invention relates to an apparatus for heat treatment of a steel sheet, and more particularly, to a steel sheet heat treatment apparatus capable of improving the rigidity of a steel sheet by performing heat treatment and heat treatment so that predetermined patterns are arranged on the steel sheet.

In the production of automotive steel, conventionally, the steel is heated to a temperature of 1100 to 1300 degrees, which is a temperature suitable for rolling the slabs produced by processing the sinter, and then rolled to a thickness and width desired by the customer, 10 mm, and the coil is formed in the form of a coil.

These coil-shaped steels are washed with acid and then rolled to normal temperature with a colt strip mill or reverse mill to produce a smooth, polished steel sheet with a uniform thickness and then delivered to the customer.

Conventionally, in this manner, various technical attempts have been made to subject the hot-rolled material to a predetermined heat treatment process before cold-rolling. In such a heat treatment process, the rigidity of the steel may be improved or decreased. And had to meet the desired quality.

In the process of heat treatment, the stiffness of the steel sheet may be lowered. If the stiffness is maintained and the steel sheet is impacted, it is a key technology to manufacture a steel sheet that can guarantee the safety of the driver and passengers.

If the stiffness of the steel sheet is weakened, the quality of the steel sheet product is deteriorated and the steel sheet of the weak stiffness can not meet the demand of the customer. Such a weak stiffness steel sheet is undesirable because it may result in deterioration of the automobile and the safety of the driver and the passenger.

If the rigidity of the steel plate is too strong, the above-described safety of the driver or the passenger may be deteriorated. In this case, the steel plate is most ideal when a shock is properly absorbed at the same time.

KR 10-2003-0034548 A JP 2006-121578 A

The steel plate heat treatment apparatus according to the present invention has been devised to solve the above-mentioned problems of the prior art, and a heat treatment process is performed between the hot rolling and the cold rolling of the steel sheet to reinforce or at least supplement the rigidity of the steel sheet .

The solution of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

The steel plate heat treatment apparatus according to the present invention has the following means for solving the above-mentioned problems to be solved.

The steel plate heat treatment apparatus according to the present invention includes a heat treatment unit for heat treating the steel plate so as to have a predetermined pattern on the surface of the steel plate; And a cooling unit for cooling the steel plate heat-treated by the heat treatment unit.

The heat treatment unit of the steel plate heat treatment apparatus according to the present invention may include a high frequency heat treatment unit applying electromagnetic waves to the steel plate to apply local heating to the predetermined pattern.

In the steel plate heat treatment apparatus according to the present invention, the heat treatment unit may include a laser heat treatment unit for irradiating a laser beam onto the surface of the steel plate to advance the heat treatment of the predetermined pattern.

The heat treatment unit of the steel plate heat treatment apparatus according to the present invention may include a plasma heat treatment unit for forming the predetermined pattern on the steel sheet through heat treatment through plasma.

The plasma heat treatment unit of the steel plate heat treatment apparatus according to the present invention includes a plurality of nozzles for applying plasma heat toward the steel sheet, wherein the plurality of nozzles include a pilot gas layer and a plasma gas layer, Is added.

The nozzle of the steel plate heat treatment apparatus according to the present invention further includes a shielding gas layer formed along the outer circumferential surface of the nozzle and formed to surround the side surfaces of the pilot gas layer and the plasma gas layer to block the outflow of the plasma heat .

The heat treatment unit of the steel plate heat treatment apparatus according to the present invention may include a projection heat treatment unit applying spot welding to one surface of the steel sheet and applying heat treatment to the steel sheet.

The heat treatment unit of the steel plate heat treatment apparatus according to the present invention includes a seam heat treatment unit which is in contact with the upper and lower surfaces of the steel sheet and applies a heat treatment with the predetermined pattern in a direction perpendicular to the progressing direction of the steel sheet .

The seam heat treatment unit of the steel plate heat treatment apparatus according to the present invention comprises: a pair of pressure rolls which are brought into contact with the upper and lower surfaces of the steel sheet to roll the steel sheet; And a plurality of hot wires arranged inside the pressing roll in parallel to the axis of the pressing roll and generating heat by electrical resistance.

The predetermined pattern of the steel plate heat treatment apparatus according to the present invention may be a plurality of lines formed along the progressing direction of the steel plate.

The predetermined pattern of the steel plate heat treatment apparatus according to the present invention may be a plurality of spots formed on the surface of the steel sheet.

The heat treatment unit of the steel plate heat treatment apparatus according to the present invention may be characterized in that the steel plate is heated to a range of 1100 to 1350 degrees Celsius.

The cooling unit of the steel plate heat treatment apparatus according to the present invention may be characterized in that the heat treated steel sheet is cooled to a range of 500 to 800 degrees Celsius per second.

The steel plate heat treatment apparatus according to the present invention having the above-described structure has the following effects.

First, the rigidity of the entire steel plate is reinforced through the patterned heat-treated portion formed along the surface of the steel plate.

Second, through the patterned heat treatment pattern, the energy absorption rate of the steel sheet is remarkably increased when the steel plate is impacted, thereby providing an advantage of protecting the life of the driver and the passenger when applied to the automotive steel plate.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a side view showing an embodiment of a high frequency heat treatment unit of the present invention.
2 is a side view showing an embodiment of the laser heat treatment unit of the present invention.
3 is a side cross-sectional view showing one embodiment of a nozzle of the plasma heat treatment unit of the present invention.
4 illustrates a steel sheet having a pattern formed by performing a heat treatment of a steel sheet by a laser / plasma heat treatment unit according to an embodiment of the present invention.
5 is an enlarged view showing an organization chart of the steel plate base material and the heat-treated portion in Fig.
6 is a side view showing one embodiment of the projection heat treatment unit of the present invention.
7 shows a steel sheet on which a pattern is formed by performing heat treatment of a steel sheet by a projection heat treatment unit according to an embodiment of the present invention.
8 is an enlarged view showing an organization chart of the steel plate base material and the heat-treated portion in Fig. 7. Fig.
9 is a side view illustrating a seam heat treatment unit, in accordance with an embodiment of the present invention.
10 shows a steel sheet in which a pattern is formed by performing heat treatment of a steel sheet by a seam heat treatment unit according to an embodiment of the present invention.
11 is an enlarged photograph showing an organization chart of the steel sheet base material and the heat-treated portion in Fig.
FIGS. 12 to 14 are photographs of experiments for observing the degree of bending and the bent shape by applying an external force to a steel sheet heat treated to have a pattern.

The steel plate heat treatment apparatus according to the present invention can be variously modified and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the description. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a steel sheet heat treatment apparatus according to the present invention will be described in detail with reference to the drawings.

1 is a side view showing an embodiment of a high frequency heat treatment unit of the present invention. 2 is a side view showing an embodiment of the laser heat treatment unit of the present invention. 3 is a side cross-sectional view showing one embodiment of a nozzle of the plasma heat treatment unit of the present invention. 4 illustrates a steel sheet having a pattern formed by performing a heat treatment of a steel sheet by a laser / plasma heat treatment unit according to an embodiment of the present invention. 5 is an enlarged view showing an organization chart of the steel plate base material and the heat-treated portion in Fig. 6 is a side view showing one embodiment of the projection heat treatment unit of the present invention. 7 shows a steel sheet on which a pattern is formed by performing heat treatment of a steel sheet by a projection heat treatment unit according to an embodiment of the present invention. 8 is an enlarged view showing an organization chart of the steel plate base material and the heat-treated portion in Fig. 7. Fig. 9 is a side view illustrating a seam heat treatment unit, in accordance with an embodiment of the present invention. 10 shows a steel sheet in which a pattern is formed by performing heat treatment of a steel sheet by a seam heat treatment unit according to an embodiment of the present invention. 11 is an enlarged photograph showing an organization chart of the steel sheet base material and the heat-treated portion in Fig. FIGS. 12 to 14 are photographs of experiments for observing the degree of bending and the bent shape by applying an external force to a steel sheet heat treated to have a pattern.

As shown in FIGS. 1, 2, 6 and 9, the steel sheet heat treatment apparatus according to the present invention includes a heat treatment unit (not shown) for preventing the lowering of the rigidity of a steel sheet which may occur between hot rolling and cold rolling of the steel sheet 1 110 to 140) and a cooling unit (30).

First, the heat treatment units 110 to 140 draw the hot-rolled steel sheet 1 and heat-treat the surface of the steel sheet 1 so as to have a predetermined pattern on the surface of the steel sheet 1.

The heat treatment units 110 to 140 do not heat the entire surface of the steel plate 1 but are heat treated on one surface, for example, the upper surface or the entire thickness so as to have a predetermined pattern, as mentioned above.

These heat treatment units 110 to 140 heat treat only the above-described optional portions, instead of performing the heat treatment on the steel sheet 1 and the heat treatment over the entire area, and then the cooling unit 30 is heated at the set cooling rate The steel plate 1 is made to have a rigidity only in a part of the upper surface thereof. The heat treatment and the cooling process of the part having a predetermined pattern partially maintain or reinforce the rigidity of the steel plate 1 In addition, when the steel sheet 1 is used as a steel sheet for automobiles, the steel sheet 1 absorbs the impact of the automobile, thereby having a remarkably heterogeneous effect of protecting the life of the vehicle driver and the passenger.

In the case of the steel sheet 1 here, generally, all the steel grades produced in the steel making process can be covered, but the technical requirement of the shock absorption together with the improvement of the rigidity in the steel sheet for automobiles greatly plays a role, And the DP 590 (3.05 mm) steel, which is used as the steel, is mainly used.

The DP 590 steel is known in the following table as shown in the table below. After the heat treatment as described below, cold rolling is performed to 0.8 mmt, and tensile, textural, hardness and micro- The difference in hardness between the base material and the heat-treated part was also examined by confirming how much more than the heat treatment interval (20 mm).

division C Si Mn P S Cr Mo Al Nb V DP
590 river 0.082 0.025 1.771 0.045 0.0032 0.049 0.0019 0.439 0.0003 0.0018

The normal steel of the steel sheet 1 is heated to a range of austenite (1100 to 1350 degrees Celsius) and then subjected to heat treatment while controlling the temperature of 800 to 500 degrees Celsius per second by the cooling unit 30 The rigidity of the base material is higher than that of the base material and the ductility and toughness are equal.

The predetermined pattern is formed to appear linearly along the progressing direction of the steel plate 1. Such a linear pattern is formed so that a plurality of patterns appear along the width of the steel plate 1 and these patterns are subjected to heat treatment .

In the case of the heat treatment units 110 to 140, the heat treatment may be performed in various ways. First, as shown in FIG. 1, the heat treatment units 110 to 140 may be performed by the high frequency heat treatment unit 110.

The high frequency heat treatment unit 110 can apply local heating to the steel plate 1 by applying electromagnetic waves to induce heating to have a predetermined pattern, i.e., a linear pattern, by electromagnetic induction heating.

In addition, the heat treatment units 110 to 140 may form a heat treatment part having a predetermined pattern by irradiating a laser beam onto the surface of the steel plate 1, and may include a laser heat treatment unit 120 for this purpose.

In FIG. 2, the laser heat treatment unit and the plasma heat treatment unit are similar in shape, and the laser heat treatment unit and the plasma heat treatment unit are shown by way of example in FIG. 2, To 140 are denoted by the same reference numeral 120 in the laser heat treatment unit and the plasma heat treatment unit.

The heat treatment units 110 to 140 of the present invention may also include a plasma heat treatment unit 120. The plasma heat treatment unit 120 is a known plasma treatment method itself and will be briefly described as follows . As the temperature rises, the state of the material changes to solid, liquid, and gas. When it continues to heat up to thousands of degrees, the gas molecules are dissociated into atoms and separated into electrons and positively charged ions. Plasma is a gas in which the negative and positive electric charges as a whole are neutrals as a separated gas, and applying heat treatment through such a high temperature plasma gas is the basis of the plasma heat treatment technique.

As shown in FIG. 3, the plasma heat treatment unit 120 may be formed with a nozzle for generating a high-temperature plasma gas, and the plurality of nozzles may form each pattern.

In the case of the plasma heat treatment unit 120, the temperature increases due to the interaction, including the layered gas layer 123 and the plasma gas layer 124, to form a heat-treated portion having a pattern on the surface of the steel sheet 1 .

The nozzles may further include a shielding gas layer 125 which is formed along the outer circumferential surface of the nozzle and surrounds the outer surfaces of the filer gas layer 123 and the plasma gas layer 124, Heat is prevented from flowing out to form a heat-treated portion having an elaborate pattern (see FIG. 4).

5, the heat-treated portion having the pattern 2 on the base material portion of the steel sheet 1 is provided with a dense structure as shown in the figure, The rigidity is superior to that of the base material portion. The overall stiffness of the steel plate 1 is also reinforced by this. The reason why such a pattern is not formed over the entire steel plate 1 will be described later in conjunction with Figs. 12 to 14. Fig.

Another embodiment of the heat treatment units 110 - 140 may include a projection heat treatment unit 130.

6, the projection heat treatment unit 130 applies spot welding to one surface of the steel sheet 1, that is, the upper surface thereof, to heat the upper surface of the steel sheet 1 partially.

The projection heat treatment unit 130 forms a spot heat treatment pattern as shown in FIG. 7 while pressing the upper surface of the steel sheet 1 as shown in FIG. 6 and then quenching ).

As shown in FIG. 7, in the case of the projection heat treatment unit 130, the spot pattern is subjected to heat treatment from the upper surface to the lower surface of the steel sheet 1 as a base material. 7, the portion of the heat-treated and cooled portion is dense and has a higher rigidity than that of the base material. Therefore, Thereby providing the effect of raising the rigidity of the steel plate 1 as a whole and providing the function of shock absorption in addition to the rigidity of the entire steel plate 1, as will be described later.

As another example, the heat treatment units 110 to 140 may include a seam heat treatment unit 140, as shown in FIG.

9, the seam heat treatment unit 140 is provided with a pair of pressure rolls 141 provided in the upper and lower portions, and the steel strip 1 is drawn in by the rolling of the pressure rolls 141 .

The pressing roll 141 is provided with a plurality of heat lines 144. The hot plate 144 is instantaneously subjected to heat treatment at a portion of the steel plate 1 adjacent to the heat line 144.

In the case of the seam heat treatment unit 140, the heat ray 144 is applied to the pressing roll 141 (FIG. 1) inside the pressing roll 141 to be rolled, And a heat treatment pattern is formed along a line, that is, a width, perpendicular to the traveling direction of the steel plate 1. The heat treatment pattern is formed along the axis of the steel plate 1,

A plurality of such heat lines 144 may be provided, and the heat lines 144 may have different arrangement intervals depending on the circumference of the pressing roll 141 in consideration of a pattern to be formed.

12 to 14, how the steel plate 1 has improved rigidity and impact absorption performance according to the application of the present invention will be described.

12 is a steel plate 1 having a heat treatment by the laser heat treatment unit 120. In the case of FIG. 13, the heat treated steel plate 1 by the seam heat treatment unit 140 and the projection heat treatment unit Treated steel sheet 1 by the heat-treating method.

In the case of these heat-treated and quenched steel sheets 1, the regions where the patterns are formed, that is, the heat-treated and cooled-down local portions form a stiff resistance region even when the steel sheet 1 is bent by providing a pressing force, It was observed that the steel plate 1 was bent along both sides of the stiffness resistance section. That is, when an external impact is applied to the steel strip 1, the fold is not formed along one line but bent along both sides of the stiffness resistance section, and the bent steel strip 1 itself is bent like a spring When the steel sheet 1 produced by the present invention is used as a steel sheet for an automobile due to such a phenomenon, even if an impact is applied to the steel sheet 1 due to an automobile accident or the like, It is a phenomenon that instantly expresses the function of absorption. The wider the width of the heat treatment area, the broader the stiffness resistance range of the material. However, if it is too wide, the bending phenomenon like a spring can not be observed, and it is desirable to form a pattern having an appropriate width. Therefore, it is preferable that the width is formed to be about 50 mm to 200 mm.

The scope of the present invention is defined by the claims, the parentheses used in the claims are not used for optional limitation but are used for the definite components and the description in parentheses is also interpreted as an essential component .

1: steel plate
10: Rollers
20: Cold Rolled Roller
30: cooling section
110: High frequency heat treatment unit
120: laser plasma heat treatment unit
130: projection heat treatment unit
140: Seam heat treatment unit

Claims (13)

A heat treatment unit for subjecting the steel sheet to a heat treatment so as to have a predetermined pattern on a surface of the steel sheet; And
And a cooling unit for cooling the steel sheet heat-treated by the heat treatment unit.
The heat treatment apparatus according to claim 1,
And a high frequency heat treatment unit applying electromagnetic waves to the steel plate to apply local heating to the predetermined pattern.
The heat treatment apparatus according to claim 1,
And a laser annealing unit for irradiating the surface of the steel sheet with a laser to advance the heat treatment of the predetermined pattern.
The heat treatment apparatus according to claim 1,
And a plasma heat treatment unit for forming the predetermined pattern on the steel plate through heat treatment through a plasma.
The plasma processing apparatus according to claim 4,
And a plurality of nozzles for applying plasma heat toward the steel sheet,
Wherein the plurality of nozzles comprises:
Including a pilot gas layer and a plasma gas layer,
And a heat treatment is applied to the surface of the steel sheet.
6. The apparatus according to claim 5,
Further comprising a shielding gas layer formed along an outer circumferential surface of the nozzle and formed to surround the side surfaces of the pilot gas layer and the plasma gas layer to block outflow of the plasma heat.
The heat treatment apparatus according to claim 1,
And a projection heat treatment unit applying spot welding to one surface of the steel sheet to apply heat treatment to the steel sheet.
The heat treatment apparatus according to claim 1,
And a seam heat treatment unit contacting the upper and lower surfaces of the steel sheet and applying a heat treatment with the predetermined pattern in a direction perpendicular to a traveling direction of the steel sheet.
9. The apparatus according to claim 8, wherein the seam heat-
A pair of pressing rolls which are brought into contact with the upper and lower surfaces of the steel sheet to roll the steel sheet; And
And a plurality of hot wires arranged inside the pressing roll so as to be parallel to the axis of the pressing roll and generating heat by electrical resistance.
7. The method according to any one of claims 2 to 6,
Wherein the plurality of lines are formed along a traveling direction of the steel plate.
8. The method according to claim 7,
And a plurality of spots formed on the surface of the steel sheet.
The heat treatment apparatus according to claim 1,
Wherein the steel sheet is heated to a range of 1100 to 1350 degrees Celsius.
The refrigeration system according to claim 1,
Wherein the heat treated steel sheet is cooled to a range of 500 to 800 degrees Celsius per second.
KR1020150116284A 2015-08-18 2015-08-18 Apparatus for heat treatment of steel plate KR101745351B1 (en)

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KR101745351B1 KR101745351B1 (en) 2017-06-09

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030034548A (en) 2001-10-26 2003-05-09 주식회사 성우하이텍 Method for strengthening of Steel Sheets for Automobile and thereof Products
JP2006121578A (en) 2004-10-25 2006-05-11 Matsushita Electric Ind Co Ltd Image transmission system, image transmitting apparatus, image receiving apparatus and image transmitting method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030034548A (en) 2001-10-26 2003-05-09 주식회사 성우하이텍 Method for strengthening of Steel Sheets for Automobile and thereof Products
JP2006121578A (en) 2004-10-25 2006-05-11 Matsushita Electric Ind Co Ltd Image transmission system, image transmitting apparatus, image receiving apparatus and image transmitting method

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