JPS6336901A - Blooming method for steel ingot - Google Patents
Blooming method for steel ingotInfo
- Publication number
- JPS6336901A JPS6336901A JP17783486A JP17783486A JPS6336901A JP S6336901 A JPS6336901 A JP S6336901A JP 17783486 A JP17783486 A JP 17783486A JP 17783486 A JP17783486 A JP 17783486A JP S6336901 A JPS6336901 A JP S6336901A
- Authority
- JP
- Japan
- Prior art keywords
- surface layer
- temp
- steel ingot
- blooming
- heating furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims description 20
- 239000002344 surface layer Substances 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 239000003507 refrigerant Substances 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 13
- 230000009466 transformation Effects 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 abstract description 6
- 239000000498 cooling water Substances 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 abstract 2
- 238000003466 welding Methods 0.000 abstract 2
- 238000005266 casting Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 abstract 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、連続鋳造装置等により鋳造されたブルーム
等の鋼塊をビレット等に分塊圧延する鋼塊の分塊圧延方
法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for blooming a steel ingot, which involves blooming a steel ingot such as a bloom cast by a continuous casting device or the like into a billet or the like.
（従来の技術とその問題点）
従来、例えば連続鋳造装置で鋳造されたブルーム等の鋼
塊をビレット等に分塊圧延する場合、経済性を考慮して
連続鋳造装置の水冷鋳型から引き抜かれた鋳片を直ちに
加熱炉ないしは均熱炉に装入し、所要の温度まで加熱し
た後分塊圧延している。この圧延時の鋼塊の表層部と中
心部には大きな温度差があることが多く、大きな温度差
を有したまま分塊圧延すると第３図に示すように歩留ま
りが悪く、且つ鋼塊の中心部に未圧着部が生じて機械的
性質に悪影響を与え、この鋼片を機械構造用鋼等に使用
すると不都合が生じる。より具体的には、加熱炉で加熱
され圧延される鋼塊（鋼片）ｌの表層部１ａ、ｌａが中
心部１ｂより高温状態にあると、この鋼塊ｌの圧延時に
高温にある表層部１ａ＋ Ｉａの圧延量が中心部１ｂの
圧延量より大きく、中心部１ｂに介在する気孔２等の未
圧着を防止するには鍛錬比を大きく設定する必要があっ
た。又、圧延鋼片１の長手方向両側縁部１ｃ、 ｌｃは
表層部１ａと中心部１ｂの圧延量の相違から表層部１ａ
が中心部１ｂより横方向に張り出し、製品仕上げ時には
この張出部を図中切断線Ａで示す位置で切り落とす必要
があり、歩留りが悪かった。(Conventional technology and its problems) Conventionally, when blooming or other steel ingots cast in a continuous casting machine were to be rolled into billets, etc., the steel was pulled out from the water-cooled mold of the continuous casting machine in consideration of economic efficiency. The slab is immediately charged into a heating furnace or soaking furnace, heated to a required temperature, and then bloomed. There is often a large temperature difference between the surface layer and the center of the steel ingot during rolling, and if the blooming is carried out with a large temperature difference, the yield will be poor as shown in Figure 3, and the center of the steel ingot will Uncrimped parts are formed in the parts, which adversely affects the mechanical properties, and this causes inconvenience when this steel piece is used for machine structural steel, etc. More specifically, if the surface layer parts 1a and la of the steel ingot (steel billet) l heated and rolled in a heating furnace are in a higher temperature state than the center part 1b, the surface layer part which is at a high temperature when this steel ingot l is rolled. The rolling amount of 1a+Ia was larger than the rolling amount of the center portion 1b, and it was necessary to set a large forging ratio in order to prevent the pores 2, etc. present in the center portion 1b from being uncrimped. Also, the longitudinal side edges 1c and lc of the rolled steel slab 1 are different from each other in the surface layer 1a due to the difference in rolling amount between the surface layer 1a and the center portion 1b.
protrudes laterally from the center portion 1b, and when finishing the product, it is necessary to cut off this protruding portion at the position shown by cutting line A in the figure, resulting in poor yield.
又、連続鋳造装置の鋳型から引き抜かれたばかりの鋼塊
１の表層部１ａの温度がＡｒｌ変態点よりかなり高温乃
至はＡｒ＋変態点直上の温度にあり、未だオーステナイ
トの状態にある鋼塊ｌを加熱炉等で加熱すると鋼塊１の
結晶粒度が粗大化するので分塊圧延時に表面割れが発生
することが多い。In addition, the temperature of the surface layer 1a of the steel ingot 1 that has just been pulled out of the mold of the continuous casting device is considerably higher than the Arl transformation point or just above the Ar+ transformation point, and the steel ingot 1, which is still in the austenitic state, is heated. When heated in a furnace or the like, the grain size of the steel ingot 1 becomes coarser, so surface cracks often occur during blooming.
特に、鋼塊１がアルミ脱酸されたキルド鋼の場合、粗大
化した粒界に窒化アルミ（ＡＩＮ）が析出し、高温度の
脆性を高め割れ発生の起因となることが多い。In particular, when the steel ingot 1 is killed steel in which aluminum has been deoxidized, aluminum nitride (AIN) precipitates at coarse grain boundaries, often increasing brittleness at high temperatures and causing cracks.
本発明は斯かる問題点を解決するためになされたもので
、鋼塊の分塊圧扉時に鋼塊の中心部を強化して中心部未
圧着の防止を図り、鋼種によって発生し易い表面割れの
防止を図り、しかも、分塊圧延前の鋼塊加熱ないしは均
熱工程の処理時間を短縮して生産性の向上を図った鋼塊
の分塊圧延方法を提供することを目的とする。The present invention has been made to solve such problems, and aims to strengthen the center of the steel ingot during the blooming process of the steel ingot to prevent the center from being unbonded, thereby preventing surface cracks that tend to occur depending on the steel type. It is an object of the present invention to provide a method for blooming a steel ingot, which aims to prevent the above problems and also improves productivity by shortening the processing time of the steel ingot heating or soaking process before blooming.
（問題点を解決するための手段）
上述の目的を達成するために本発明に依れば、加熱炉な
いしは均熱炉により加熱した鋼塊を冷媒により急冷して
前記鋼塊の表層部と中心部の温度差を所定温度以下にし
、その後に分塊圧延することを特徴とする鋼塊の分塊圧
延方法が提供される。(Means for Solving the Problems) In order to achieve the above-mentioned object, according to the present invention, a steel ingot heated in a heating furnace or a soaking furnace is rapidly cooled with a refrigerant, and the surface and center portions of the steel ingot are cooled rapidly using a refrigerant. Provided is a method for blooming a steel ingot, which comprises reducing the temperature difference between the steel ingots to a predetermined temperature or lower, and then blooming the steel ingot.
（作用）
加熱炉ないしは均熱炉により加熱され、表層部が中心部
より高温状態にある鋼塊を分塊圧延前に冷媒により急冷
して鋼塊の表層部と中心部との温度差を所定温度以下に
すると、表層部の冷却時に表層部が収縮して中心部を圧
縮し、このとき中心部の気孔等が圧着されて中心部が強
化される。(Function) A steel ingot that is heated in a heating furnace or a soaking furnace and whose surface layer is higher in temperature than its center is rapidly cooled with a refrigerant before blooming to maintain a predetermined temperature difference between the surface layer and the center of the steel ingot. When the temperature is lower than that, the surface layer contracts when the surface layer cools, compressing the center, and at this time, the pores and the like in the center are compressed and the center is strengthened.
又、必要に応じ、前記急冷時に表層部をＡｒ、変態点以
下の温度に冷却すると、急冷後の表層部温度の復熱によ
り表層部の結晶粒子が微細化され粒界が強化されて表面
割れの防止が図られる。Also, if necessary, if the surface layer is cooled to a temperature below the Ar transformation point during the rapid cooling, the crystal grains in the surface layer become finer due to the reheating of the surface layer temperature after the rapid cooling, and the grain boundaries are strengthened, causing surface cracks. This will help prevent this.
更に、圧延前に表層部を急冷すると、表面に付着してい
るスケール等が脱落してしまい、圧延時にスケールによ
り鋼片表面にキズが付くような不都合な事態が回避され
る。Furthermore, if the surface layer is rapidly cooled before rolling, scales and the like adhering to the surface will fall off, thereby avoiding an inconvenient situation where the surface of the steel piece is scratched by scale during rolling.
（実施例）
以下、本発明の一実施例を第１図及び第２図に基づいて
説明する。(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.
先ず、例えば、連続鋳造装置の冷却鋳型から引き抜き、
適当な長さに切断したブルームを直ちに加熱炉（ないし
は均熱炉）に移送する。この加熱炉に装入した時点の鋼
塊の表層部はＡｒｚ変態点直上の温度乃至はこれより高
温度（第２図の１０時点における表層部温度Ｔｓ＋）に
ある。一方、中心部は凝固が完了したばかりであり、表
層部温度τＳより高温状態にある（第２図の１０時点に
おける中心部温度ＴｃＪ＊この鋼塊を表層部温度Ｔｓが
所定温度（例えば、１２００℃）になるまで加熱する（
第２図のｔ１時点）、この加熱炉で加熱する間（同図ｔ
０からｔ１時点間）、表層部温度Ｔｓが温度Ｔｓ０から
徐々に上昇するのに対して、鋼塊の中心部温度Ｔｃは装
入温度Ｔｃｏから一旦下降した後再び上昇し、加熱炉か
ら抽出する時点（１＋時点）では表層部温度ＴｓよりΔ
Ｔ１だけ低い温度を呈している。この温度差ΔＴ１は、
この温度差で分塊圧延を実行すると従前の、歩留りが多
く中心部に未圧着部が残存する鋼片が製造されてしまう
温度である。First, for example, it is pulled out from a cooling mold of a continuous casting machine,
The bloom cut to an appropriate length is immediately transferred to a heating furnace (or soaking furnace). At the time of charging into the heating furnace, the surface layer of the steel ingot is at a temperature just above the Arz transformation point or higher than this (surface layer temperature Ts+ at time 10 in FIG. 2). On the other hand, the center has just completed solidification and is at a higher temperature than the surface temperature τS (center temperature TcJ at time 10 in Figure 2). Heat until it reaches (℃).
(time t1 in Figure 2), and while heating in this heating furnace (time t1 in Figure 2).
0 to time t1), while the surface temperature Ts gradually rises from the temperature Ts0, the center temperature Tc of the steel ingot once drops from the charging temperature Tco and then rises again, and is extracted from the heating furnace. At the time point (1+ time point), Δ is lower than the surface temperature Ts.
The temperature is lower by T1. This temperature difference ΔT1 is
If blooming is performed at this temperature difference, a steel billet with a high yield and an unbonded portion remaining in the center will be produced, as was the case in the past.
本発明に係る鋼塊の分塊圧延方法に依れば、表層部と中
心部の温度差がΔＴ１であるｔ１時点で加熱炉から抽出
し、これを冷却水槽に２０〜３０秒程度投入・浸漬する
。この急冷により表層部温度は急激に降下するが、水槽
から引き上げると、表層部は中心部の熱源により再び上
昇し、表層部と中心部の温度差ΔＴ３が所定温度差（例
えば、１００℃）以下に復熱することになる。表層部が
復熱した時点で分塊圧延を開始する（第２図ｔ２時点）
。このとき、表層部温度Ｔｓは中心部温度Ｔｃより高く
てもよいが、中心部温度Ｔｃより低い方が望ましい。こ
のように、鋼塊を冷却水槽に投入してその表層部を急激
に冷却することにより表層部が収縮し、これにより中心
部かが急激に圧縮され中心部に介在していた気孔等が圧
着されて中心部が緻密になり、強化される。従って、分
塊圧延時に特に鍛錬比を大きく設定しなくても中心部に
おける機械的強度のすぐれた鋼片が得られることになる
。According to the blooming rolling method of a steel ingot according to the present invention, the steel ingot is extracted from the heating furnace at time t1 when the temperature difference between the surface layer and the center is ΔT1, and the ingot is put into a cooling water tank and immersed for about 20 to 30 seconds. do. This rapid cooling causes the temperature of the surface layer to drop rapidly, but when the water is removed from the water tank, the surface layer rises again due to the heat source in the center, and the temperature difference ΔT3 between the surface layer and the center falls below a predetermined temperature difference (for example, 100°C). It will regenerate. Blooming begins when the surface layer is reheated (time t2 in Figure 2)
. At this time, the surface temperature Ts may be higher than the center temperature Tc, but is preferably lower than the center temperature Tc. In this way, by putting a steel ingot into a cooling water tank and rapidly cooling its surface layer, the surface layer contracts, and as a result, the center is rapidly compressed, and the pores etc. in the center are compressed. The center becomes denser and stronger. Therefore, a steel billet with excellent mechanical strength in the center can be obtained without particularly setting a large forging ratio during blooming.
又、冷却時の表層部の急激な収縮により、加熱炉での加
熱時等に表層部に生成・付着したスケール等が脱落して
しまい表面疵を防止する上で好都合である。即ち、従来
の分塊圧延方法では加熱炉から抽出された鋼塊を粗圧延
ないしはデスケーラに掛けてこれらのスケールを削り落
としていたが、本発明方法ではこれらのデスケーラ等を
必要としない。In addition, due to rapid contraction of the surface layer during cooling, scales generated and attached to the surface layer during heating in a heating furnace or the like will fall off, which is advantageous in preventing surface flaws. That is, in the conventional blooming rolling method, the steel ingot extracted from the heating furnace is subjected to rough rolling or a descaler to remove these scales, but the method of the present invention does not require such a descaler.
更に、鋼塊の表層部と中心部との温度差を前記所定温度
差（１００℃）以下にするため、従来、第２図に示すよ
うにｔ１時点から更にｔ１時点まで加熱炉で加熱した後
圧延を行うか、加熱炉から抽出して室温で放置し、表層
部と中心部との温度差が前記所定温度差になるのを待っ
て分塊圧延を実行していたが、本発明方法に依れば冷媒
で表層部を急冷するので加熱炉での長時間の加熱等が必
要でなくなり加熱炉の熱経済性及び生産性が大きく改善
されることになる。Furthermore, in order to keep the temperature difference between the surface layer and the center of the steel ingot below the predetermined temperature difference (100°C), conventionally, as shown in FIG. 2, after heating in a heating furnace from time t1 to time t1, The method of the present invention has been used to perform blooming by rolling or extracting the material from a heating furnace and leaving it at room temperature, and waiting until the temperature difference between the surface layer and the center reaches the predetermined temperature difference. Accordingly, since the surface layer portion is rapidly cooled with a refrigerant, there is no need for long-term heating in a heating furnace, and the thermoeconomic efficiency and productivity of the heating furnace are greatly improved.
冷却水槽で所定時間急冷され、分塊圧延ラインに移送さ
れた鋼塊を通常の方法により分塊圧延する。このとき、
鋼塊の表層部と中心部との温度差が小さいために表層部
及び中心部の圧延量が均一化されることになり、製品仕
上げ時に圧延鋼片の長手方向の両側縁部の切落し量が僅
かでよく歩留りが著しく改善されることになる。The steel ingot is rapidly cooled in a cooling water tank for a predetermined period of time and transferred to a blooming line, where it is subjected to blooming in a conventional manner. At this time,
Since the temperature difference between the surface layer and the center of the steel ingot is small, the amount of rolling in the surface layer and center is equalized, and the amount of cutting off of both longitudinal edges of the rolled steel ingot during product finishing is reduced. This means that the yield is significantly improved.
尚、必要に応じ前記急冷時に鋼塊表層部温度Ｔｓの極小
値Ｔｓ、がＡｒ＋変態点以下の温度になるように鋼塊表
層部を急冷するようにしてもよい、このように表層部温
度を一旦Ａｒ＋変態点以下の温度に下げると、表層部温
度がＡｒ＋変態点温度以上に復熱するときに結晶粒度が
微細化して粒界が強化され、分塊圧延時に生じ易い表面
割れが防止される。Incidentally, if necessary, the surface layer of the steel ingot may be rapidly cooled during the rapid cooling so that the minimum value Ts of the surface layer temperature Ts of the steel ingot becomes a temperature equal to or lower than the Ar+transformation point. Once the temperature is lowered to below the Ar+ transformation point, when the surface layer temperature reheats above the Ar+ transformation point, the grain size becomes finer and the grain boundaries are strengthened, preventing surface cracks that tend to occur during blooming. .
この急冷処理は、特に、アルミ脱酸剤を添加し、粒界に
窒化アルミ（ＡＩＮ）を析出した鋼塊等に有効である。This rapid cooling treatment is particularly effective for steel ingots to which an aluminum deoxidizing agent has been added and aluminum nitride (AIN) precipitated at grain boundaries.
又、上述の実施例では連続鋳造装置により鋳造されたブ
ルーム等の鋼塊を例に分塊圧延する方法を説明したが、
本発明方法はこれに限らずインゴットケースにより造塊
される鋼塊をビレット等に分塊圧延する場合にも適用で
きることは勿論のことである。In addition, in the above-mentioned embodiment, a method of blooming was explained using a steel ingot such as a bloom cast by a continuous casting machine as an example.
It goes without saying that the method of the present invention is not limited to this, and can also be applied to the case of blooming a steel ingot formed by an ingot case into a billet or the like.
更に、上述の実施例では加熱炉から抽出した鋼塊を冷却
水槽に投入・浸漬して急冷させたが、鋼塊の表層部を急
冷する方法としてはこれに限定されず大量の冷却水を鋼
塊表面にスプレーしてもよく、又、冷媒としては水でな
くても鋼塊表層部を短時間に所定の温度まで急冷できる
ものであればよく、冷却した空気を吹きつけても良い。Furthermore, in the above example, the steel ingot extracted from the heating furnace was put into a cooling water tank and immersed in it to cool it rapidly, but the method for rapidly cooling the surface layer of the steel ingot is not limited to this. It may be sprayed onto the surface of the ingot, and the refrigerant does not need to be water as long as it can rapidly cool the surface layer of the steel ingot to a predetermined temperature in a short period of time, and cooled air may be sprayed.
（発明の効果）
以上詳述したように本発明の鋼塊の分塊圧延方法に依れ
ば、加熱炉ないしは均熱炉により加熱した鋼塊を冷媒に
より急冷して鋼塊の表層部と中心部の温度差を所定温度
以下にし、その後に分塊圧延するようにしたので、又、
必要に応じ前記急冷時に鋼塊の表層部をＡｒ、変態点以
下の温度に冷却するようにしたので、加熱炉等における
熱経済性、及び生産性を向上させつつ鋼塊中心部の気孔
等の未圧着を防止して中心部の強化が図れ、しかも、歩
留りの向上が図れ、表面割れの発生が防止出来るとうい
う種々の優れた効果を奏する。(Effects of the Invention) As detailed above, according to the method for blooming steel ingots of the present invention, a steel ingot heated in a heating furnace or a soaking furnace is rapidly cooled with a refrigerant, and the surface and center portions of the steel ingot are Since the temperature difference between the two parts is set below a predetermined temperature and then the blooming is carried out,
If necessary, during the quenching process, the surface layer of the steel ingot is cooled to a temperature below the Ar transformation point, which improves the thermo-economic efficiency and productivity in the heating furnace, while also eliminating pores in the center of the steel ingot. It has various excellent effects such as preventing non-crimping, strengthening the center, improving yield, and preventing surface cracks.
第１図は本発明に係る鋼塊の分塊圧延方法の一実施例に
よる分塊圧延手順を示す工程図、第２図は鋼塊が加熱炉
に装入・加熱されてから同加熱炉から抽出されて急冷さ
れ、その後分塊圧延が開始されるまでの鋼塊の表層部及
び中心部の温度変化を模式的に示すグラフ、第３図は従
来の方法により圧延された場合の問題点を説明するため
の、圧延鋼片の断面図である。
１・・・圧延鋼片、１ａ・・・表層部、１ｂ・・・中心
部、２・・・気孔。Fig. 1 is a process diagram showing a blooming procedure according to an embodiment of the method for blooming a steel ingot according to the present invention, and Fig. 2 shows a steel ingot after being charged and heated in a heating furnace and then removed from the same heating furnace. A graph schematically showing the temperature changes in the surface layer and center of the steel ingot after it is extracted and rapidly cooled until the start of blooming. Figure 3 shows the problems when rolling by the conventional method. It is a sectional view of a rolled steel piece for explanation. DESCRIPTION OF SYMBOLS 1... Rolled steel piece, 1a... Surface layer part, 1b... Center part, 2... Pore.
Claims (2)
により急冷して前記鋼塊の表層部と中心部の温度差を所
定温度以下にし、その後に分塊圧延することを特徴とす
る鋼塊の分塊圧延方法。(1) Steel characterized in that a steel ingot heated in a heating furnace or a soaking furnace is rapidly cooled with a refrigerant so that the temperature difference between the surface layer and the center of the steel ingot is below a predetermined temperature, and then blooming is carried out. A method of blooming and rolling a lump.
の温度に冷却することを特徴とする特許請求の範囲第１
項記載の鋼塊の分塊圧延方法。(2) During the rapid cooling, the surface layer of the steel ingot is cooled to a temperature below the Ar_1 transformation point.
A method for blooming a steel ingot as described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17783486A JPS6336901A (en) | 1986-07-30 | 1986-07-30 | Blooming method for steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17783486A JPS6336901A (en) | 1986-07-30 | 1986-07-30 | Blooming method for steel ingot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6336901A true JPS6336901A (en) | 1988-02-17 |
Family
ID=16037927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17783486A Pending JPS6336901A (en) | 1986-07-30 | 1986-07-30 | Blooming method for steel ingot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6336901A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673445A (en) * | 1992-08-27 | 1994-03-15 | Kobe Steel Ltd | Manufacture of steel material having little surface flaw |
| JP2017006964A (en) * | 2015-06-24 | 2017-01-12 | 新日鐵住金株式会社 | Billet manufacturing method and billet manufacturing equipment |
-
1986
- 1986-07-30 JP JP17783486A patent/JPS6336901A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673445A (en) * | 1992-08-27 | 1994-03-15 | Kobe Steel Ltd | Manufacture of steel material having little surface flaw |
| JP2017006964A (en) * | 2015-06-24 | 2017-01-12 | 新日鐵住金株式会社 | Billet manufacturing method and billet manufacturing equipment |
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