JPS61132201A - Rolling method of billet - Google Patents
Rolling method of billetInfo
- Publication number
- JPS61132201A JPS61132201A JP25370184A JP25370184A JPS61132201A JP S61132201 A JPS61132201 A JP S61132201A JP 25370184 A JP25370184 A JP 25370184A JP 25370184 A JP25370184 A JP 25370184A JP S61132201 A JPS61132201 A JP S61132201A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- sides
- long
- short
- billet
- 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.)
- Granted
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 abstract description 10
- 239000011148 porous material Substances 0.000 abstract 2
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002788 crimping Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の技術分野〕 この発明は、鋼鋳片の圧延方法に関するものである。[Detailed description of the invention] [Technical field of invention] The present invention relates to a method for rolling steel slabs.
例えば、連続鋳造機によって製造された鋼鋳片内には、
ポロシティが必らず発生する。これは、次の理由による
。即ち、第２図に示されるように、連続鋳造された鋼鋳
片（以下、単に鋳片という）のように比較的断面積の小
さい鋳片が凝固する場合、凝固組織は、鋳片の四周から
中央部に向けて発達し、最終的に鋳片中央部で衝突して
凝固が完了する。凝固組織の先端は、必らずしも揃って
いないので、鋳片中央部には、凝固収縮に伴なうポロシ
ティが発生する。For example, in a steel slab produced by a continuous casting machine,
Porosity always occurs. This is due to the following reason. That is, as shown in Fig. 2, when a slab with a relatively small cross-sectional area, such as a continuously cast steel slab (hereinafter simply referred to as slab), solidifies, the solidification structure is formed around the four circumferences of the slab. It develops from the center toward the center of the slab, and finally collides with the center of the slab to complete solidification. Since the tips of the solidified structure are not necessarily aligned, porosity occurs in the center of the slab due to solidification shrinkage.
従来、上記ポロシティを圧着除去する方法として、下記
構成からなる方法が提案されている。Conventionally, as a method for removing the above-mentioned porosity by pressing, a method having the following configuration has been proposed.
（１）鋳片圧延時、鋳片の純粋変形抵抗（ｋ）と圧下に
よる垂直最大圧延応力（σｔ）との比（σｔ／ｋ ）が
１より大きい圧下率をある時間の間とる。(1) During slab rolling, the ratio of the pure deformation resistance (k) of the slab to the vertical maximum rolling stress (σt) due to rolling reduction (σt/k) is set at a reduction rate of greater than 1 for a certain period of time.
（２）圧延途中で鋳片を再加熱してポロシティの圧着効
果を増大させる。(2) The slab is reheated during rolling to increase the porosity compression effect.
（３）圧下によるポロシティの圧着効果を充分に高める
ために圧延速度を低下させる。(3) The rolling speed is reduced in order to sufficiently enhance the porosity compression effect due to rolling.
しかし、上述した方法は、鋳片をその長辺面側から主に
圧下して鋼板を製造する場合にポロシティ圧着効果があ
るものであって、断面が長方形状の鋳片を断面が正方形
状または円形状の製品に圧延する場合には、ポロシティ
の圧着効果は余りなかった。However, the above-mentioned method has a porosity crimping effect when manufacturing a steel plate by mainly rolling down a slab from its long side, and converts a slab with a rectangular cross section into a square or square cross section. When rolling into a circular product, the porosity had little crimp effect.
そこで、断面が長方形状の鋳片を断面が正方形状または
円形状の製品に圧延する場合に、前記鋳片内のポロシテ
ィを完全に圧着除去することができる方法が望まれてい
たが、かかる方法はまだ提案されていない。Therefore, when rolling a slab with a rectangular cross section into a product with a square or circular cross section, there has been a desire for a method that can completely press and remove the porosity in the slab. has not been proposed yet.
従って、この発明の目的は、断面が長方形状の鋳片を断
面が正方形または円形状の製品に圧延する場合に、鋳片
内のポロシティを完全に圧着除去することができる方法
を提供することにある。Therefore, an object of the present invention is to provide a method that can completely remove porosity in a slab when rolling a slab with a rectangular cross section into a product with a square or circular cross section. be.
この発明は、断面が長方形状の鋳片を圧下して断面が正
方形状または円形状の製品を製造するに際して、前記鋳
片の長辺面側から圧下を加え、次いで、前記鋳片の短辺
面側から圧下を加えることからなる操作を少なくとも１
回行なって、前記鋳片内のポロシティを圧着除去するこ
とに特徴を有する。In this invention, when manufacturing a product having a square or circular cross section by rolling down a slab with a rectangular cross section, rolling is applied from the long side of the slab, and then the short side of the slab is rolled down. At least one operation consisting of applying pressure from the side
The method is characterized in that the porosity within the slab is removed by pressing.
次に、この発明の方法の一実施態様を図面を参照しなが
ら説明する。第１図は、この発明の方法の一実施態様の
圧下スケゾュールを示す図である。Next, one embodiment of the method of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a reduction schedule of one embodiment of the method of the present invention.
第１図に示されるように、この発明の方法は、図中Ａ点
で示される、断面が長方形状の鋳片を図中Ｂ点で示され
る、断面が正方形状（または、円形状）の製品に圧延す
る場合に、第１パスは、長辺面側から鋳片を圧下する。As shown in FIG. 1, the method of the present invention converts a cast slab with a rectangular cross section, shown at point A in the figure, into a slab with a square (or circular) cross section, shown at point B in the figure. When rolling into a product, the first pass is to roll down the slab from the long side.
これによって、鋳片の短辺長さが減少する。この圧下に
際して、圧下量は、圧延機の能力が許す限９、製品の形
状が悪くならない限り、および、表面疵が発生しない限
り、できるだけ大きくとり、また、圧延速度も、できる
だけ遅くすることが望ましい。これによって、鋳片内の
ポロシティが圧着除去される。This reduces the short side length of the slab. During this rolling, it is desirable that the amount of rolling be as large as possible, as long as the capacity of the rolling mill allows9, as long as the shape of the product does not deteriorate, and as long as surface defects do not occur, and that the rolling speed be as slow as possible. . As a result, porosity within the slab is removed by pressure.
次に、第２パスにおいても、第１パスにおけると同様に
圧下することが望ましいが、製品の断面形状を考、慰す
ると、短辺面側からも鋳片を圧下する必要がある。短辺
面側から鋳片を圧下する場合、これによる長辺長さの減
少量が、その直前の第１片を圧下する必要がある場合に
も同様である。即ち、短辺面側から鋳片を圧下する場合
には、圧下量をできるだけ小さくする必要がある。また
、圧延速度は、できるだけ大きくする必要がある。これ
によって、第１パスにおいて圧着したポロシティが再び
口を開くことを防止できる。Next, in the second pass, it is desirable to roll down the slab in the same way as in the first pass, but considering the cross-sectional shape of the product, it is necessary to roll down the slab from the short side as well. When rolling down the slab from the short side side, the amount of decrease in the length of the long side is the same even when it is necessary to roll down the first piece immediately before it. That is, when rolling down the slab from the short side, it is necessary to reduce the amount of rolling down as much as possible. Further, the rolling speed needs to be as high as possible. This can prevent the porosity crimped in the first pass from opening again.
第１図中（１）および（２）の圧延方法は、この発明の
方法による圧下スケゾュールであり、（１）の方法は、
第１パスで長辺面側を短辺長さが製品の短辺長さになる
まで圧下し、次いで、第２パス以降、短辺面側を長辺長
さが製品の長辺長さになるまで繰シ返えし圧下する方法
である。（２）の方法は、第１パスで長辺面側を圧下し
、第２パスから数バスの間、短辺面側を繰り返し圧下し
、次いで、長辺面側を再び圧下した後、短辺面側を数パ
スの間繰り返し圧下する。このような操作を短辺および
長辺長さが製品の短辺および長辺長さになるまで繰シ返
えし行なう。The rolling methods (1) and (2) in FIG. 1 are rolling schedules according to the method of the present invention, and the method (1) is
In the first pass, the long side side is rolled down until the short side length becomes the short side length of the product, and then, from the second pass onwards, the short side side is rolled down until the long side length becomes the long side length of the product. This is a method of repeatedly lowering the pressure until it becomes smooth. Method (2) involves rolling down the long side in the first pass, repeatedly rolling down the short side for several passes from the second pass, then rolling down the long side again, and then rolling down the short side. Press down the edge side repeatedly for several passes. Such operations are repeated until the lengths of the short and long sides become the lengths of the short and long sides of the product.
第１図中（３）の圧延方法は、第１パスで短辺面側を長
辺長さが製品の長辺長さになるまで圧下し、次いで、第
２パスで長辺面側を短辺長さが製品の短辺長さになるま
で圧下する。（３）の圧延方法は、この発明外の圧延方
法であり、第１パスで短辺面側を圧下するので、ポロシ
ティの圧着効果はない。In the rolling method (3) in Figure 1, the short side is rolled down in the first pass until the long side length becomes the long side length of the product, and then the long side side is rolled down in the second pass. Roll down until the side length becomes the short side length of the product. The rolling method (3) is a rolling method outside the scope of this invention, and since the short side surface side is rolled down in the first pass, there is no porosity compression effect.
以上、（１）〜（３）の圧延方法によって実際に製造し
た製品のポロシティの発生状況を調べたところ、（１）
の圧延方法によるものはポロシティはほとんど見られず
、（２）の圧延方法によるものは、わずかにポロシティ
が認められ、そして（３）の圧延方法によるものはかな
りのポロシティが認められた。As a result of investigating the occurrence of porosity in products actually manufactured using the rolling methods (1) to (3) above, (1)
Almost no porosity was observed in the rolling method (2), slight porosity was observed in the rolling method (2), and considerable porosity was observed in the rolling method (3).
以上説明したように、この発明によれば、鋳片内に存在
するポロシティを圧着して除去することができるので、
品質の優れた製品を製造することができるといった有用
な効果がもたらされる。As explained above, according to the present invention, the porosity existing in the slab can be removed by crimping.
Useful effects such as being able to manufacture products of excellent quality are brought about.
第１図は、この発明の一実施態様の圧下スケゾュールを
示す図、第２図は、鋳片の凝固組織を示す図である。FIG. 1 is a diagram showing a rolling reduction schedule according to an embodiment of the present invention, and FIG. 2 is a diagram showing a solidification structure of a slab.
Claims (1)
円形状の製品を製造するに際して、前記鋳片の長辺面側
から圧下を加え、次いで、前記鋳片の短辺面側から圧下
を加えることからなる操作を少なくとも１回行なつて、
前記鋳片内のポロシテイを圧着除去することを特徴とす
る、鋼鋳片の圧延方法。When rolling down a slab with a rectangular cross section to produce a product with a square or circular cross section, rolling is applied from the long side of the slab, and then rolling is applied from the short side of the slab. performing at least one operation consisting of adding
A method for rolling a steel slab, characterized in that porosities within the slab are removed by pressing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25370184A JPS61132201A (en) | 1984-11-30 | 1984-11-30 | Rolling method of billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25370184A JPS61132201A (en) | 1984-11-30 | 1984-11-30 | Rolling method of billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61132201A true JPS61132201A (en) | 1986-06-19 |
| JPH0225681B2 JPH0225681B2 (en) | 1990-06-05 |
Family
ID=17254946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25370184A Granted JPS61132201A (en) | 1984-11-30 | 1984-11-30 | Rolling method of billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61132201A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58301A (en) * | 1981-06-24 | 1983-01-05 | Kobe Steel Ltd | Blooming method |
| JPS5823501A (en) * | 1981-08-05 | 1983-02-12 | Kawasaki Steel Corp | Rolling method for bar steel |
-
1984
- 1984-11-30 JP JP25370184A patent/JPS61132201A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58301A (en) * | 1981-06-24 | 1983-01-05 | Kobe Steel Ltd | Blooming method |
| JPS5823501A (en) * | 1981-08-05 | 1983-02-12 | Kawasaki Steel Corp | Rolling method for bar steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0225681B2 (en) | 1990-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |