JPH066744B2 - Method for manufacturing high Ni-Fe alloy hot rolled steel sheet - Google Patents
Method for manufacturing high Ni-Fe alloy hot rolled steel sheetInfo
- Publication number
- JPH066744B2 JPH066744B2 JP61111224A JP11122486A JPH066744B2 JP H066744 B2 JPH066744 B2 JP H066744B2 JP 61111224 A JP61111224 A JP 61111224A JP 11122486 A JP11122486 A JP 11122486A JP H066744 B2 JPH066744 B2 JP H066744B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- steel sheet
- hot
- rolled steel
- antioxidant
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、連続鋳造したスラブ表面に特定成分を有する
酸化防止剤を塗布し、限定した温度範囲で該スラブを圧
延することにより粒界酸化の防止を計り、耳割れのない
表面疵の少ない高Ｎｉ−Ｆｅ合金熱延鋼板を製造する方
法に関するものである。TECHNICAL FIELD The present invention relates to the prevention of grain boundary oxidation by applying an antioxidant having a specific component to the surface of a continuously cast slab and rolling the slab in a limited temperature range. The present invention relates to a method for producing a high Ni-Fe alloy hot-rolled steel sheet having no cracks on the surface and less surface defects.
従来の技術 高Ｎｉ合金鋼のスラブから熱間圧延により熱延材を製造
する方法においては、加熱時にスラブ表面部に粒界酸化
が生じ、これを原因として圧延時にカブレ、ヘゲ等の表
面疵や耳割れが発生することが知られている。2. Description of the Related Art In a method for producing a hot rolled material from a slab of high Ni alloy steel by hot rolling, grain boundary oxidation occurs on the surface of the slab during heating, which causes surface defects such as burrs and baldness during rolling. It is known that ear cracking occurs.
上記粒界酸化の防止対策としては、従来より加熱するス
ラブの表面に酸化防止剤を塗布し、さらにその表面を薄
鋼板でカバー梱包して外気との接触を遮断することが行
われていた。しかし、この対策では、炉内で鋼板カバー
の剥離事故が生じ易く、そこからスラブの粒界酸化が生
じることいった問題があった。As a measure for preventing the grain boundary oxidation, conventionally, an antioxidant is applied to the surface of a slab to be heated, and the surface is covered and packaged with a thin steel plate to block the contact with the outside air. However, this measure has a problem in that the steel sheet cover is liable to be peeled off in the furnace and grain boundary oxidation of the slab is generated from the accident.
この問題を解決したのが、特開昭５９−５６５１９号公
報に開示された発明である。この発明は、スラブの炉内
スキッドとの接触により温度低下を生じる部分に、木片
を内張りしたスペーサーを介在させて上記の温度低下を
防止し、これにより炉内加熱温度を従来の１２５０〜１
２７０から１０８０〜１１５０℃まで低減可能としたこ
とによって、スラブの粒界酸化を生じ難くしたものであ
る。The invention disclosed in JP-A-59-56519 solves this problem. The present invention prevents the above-mentioned temperature decrease by interposing a spacer lined with wood chips at the portion where the temperature of the slab is decreased by the contact with the in-furnace skid, and thereby the heating temperature in the furnace is set to 1250-1.
By making it possible to reduce the temperature from 270 to 1,080 to 1,150 ° C., grain boundary oxidation of the slab is made difficult to occur.
発明が解決しようとする問題点 しかしながら、上記発明においては、圧延加熱に際して
スラブを薄鋼板でカバー梱包する必要はないものの、木
片を内張りしたスペーサーをスラブのサイズに合わせて
製作し、装着しなければならず、手間がかかり、生産性
に問題が残されていた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above invention, although it is not necessary to cover and package the slab with a thin steel plate at the time of rolling and heating, a spacer lined with wood chips is manufactured according to the size of the slab, and the spacer must be mounted. However, it was time-consuming and left a problem in productivity.
本発明は、このような問題を解決したものであり、加熱
に際してスラブのスキッドとの接触部分にスペーサーを
介在させる必要がなく、単にスラブの表面に特殊な酸化
防止済を所要の膜厚で塗布しておくだけで、粒界酸化の
生じ難い比較的低温での熱間圧延を実施することができ
る耳割れおよび表面疵のない高Ｎｉ−Ｆｅ合金熱延鋼板
の製造方法の提供を目的とする。The present invention solves such a problem, it is not necessary to interpose a spacer at the contact portion of the slab with the skid at the time of heating, and a special anti-oxidant coating is simply applied to the surface of the slab with a required film thickness. It is an object of the present invention to provide a method for producing a high Ni—Fe alloy hot-rolled steel sheet that is free from intergranular oxidation and that can be hot-rolled at a relatively low temperature that does not easily cause intergranular oxidation and that does not have edge cracks and surface defects. .
問題点を解決するための手段 上記目的を達成する本発明は、重量％において、Ｎｉ：
２０〜８０％、Ｃｒ：６％以下、Ｃ：．０．０２％以
下、Si：≦０．３０％、Ｍｎ≦０．８０％、残部Ｆｅお
よび不可避的不純物よりなる鋼の連続鋳造スラブから熱
延鋼板を製造する方法において、連続鋳造後のスラブ表
面に主要成分としてＳｉＯ２１５〜１７重量％，Ａｌ２
Ｏ３≦１０重量％，Ｃｒ２Ｏ２６０〜７０重量％，Ｌｉ
２Ｏ≦５重量％を含む酸化防止剤を膜厚５０〜３００μ
塗布し、該スラブを１１００〜１２００℃の温度域に加
熱保持後、熱間圧延することを特徴とする耳割れおよび
表面疵のない高Ｎｉ−Ｆｅ合金熱延鋼板の製造方法を要
旨とする。Means for Solving the Problems The present invention which achieves the above-mentioned object is, in% by weight, Ni:
20-80%, Cr: 6% or less, C :. A method for producing a hot-rolled steel sheet from a continuously cast slab of steel comprising 0.02% or less, Si: ≤ 0.30%, Mn ≤ 0.80%, the balance Fe and unavoidable impurities, the slab surface after continuous casting 15 to 17% by weight of SiO 2 and Al 2 as main components
O 3 ≦ 10 wt%, Cr 2 O 2 60-70 wt%, Li
An antioxidant containing 2 O ≦ 5% by weight is applied to a film thickness of 50 to 300 μm.
A method for producing a high Ni-Fe alloy hot-rolled steel sheet free from edge cracks and surface flaws, which comprises coating and heating and holding the slab in a temperature range of 1100 to 1200 ° C, followed by hot rolling.
次に本発明でいう高Ｎｉ−Ｆｅ合金鋼とは、主要成分で
あるＮｉ：２０〜８０％を含有し、Ｃｒ：６％以下、Ｃ
０．０２％以下、Ｓｉ≦０．３０％、Ｍｎ≦０．８０
％、残部Ｆｅおよび不可避的不純物よりなる鋼のことを
いう。Next, the high Ni-Fe alloy steel referred to in the present invention contains Ni: 20 to 80% as a main component, Cr: 6% or less, C
0.02% or less, Si ≦ 0.30%, Mn ≦ 0.80
%, The balance Fe and unavoidable impurities.
又、酸化防止剤とは、第１の組成を含有するものをい
う。Further, the antioxidant refers to the one containing the first composition.
次に酸化防止剤の主要成分の限定理由について説明す
る。 Next, the reasons for limiting the main components of the antioxidant will be described.
Ｃｒ２Ｏ３：６０％未満の場合、形成したＡｌ２Ｏ３−
Ｃｒ２Ｏ３−ＳｉＯ２系の酸化皮膜が耐熱性ＦｅＯへの
抵抗性が悪く、粒界の酸化防止効果が不充分である。Cr 2 O 3: If less than 60%, the formed Al 2 O 3 -
The Cr 2 O 3 —SiO 2 -based oxide film has poor resistance to heat-resistant FeO, and the effect of preventing grain boundary oxidation is insufficient.
：７０％を超えるとデスケール後もスラブ表面に
残り表面疵の一因となる。: When it exceeds 70%, it remains on the surface of the slab even after descaling, which causes a surface defect.
ＳｉＯ２：１５％未満の場合、Ａｌ２Ｏ３−ＳｉＯ２−
Ｃｒ２Ｏ３系となりＦｅＯへの抵抗性が悪く粒界酸化防
止が不十分である。SiO 2 : If less than 15%, Al 2 O 3 —SiO 2 —
It becomes a Cr 2 O 3 system and has poor resistance to FeO and insufficient prevention of intergranular oxidation.
：１７％を超えると黒くなりガラス状に残り、デ
スケール後もスラブ表面に残存し表面疵の一因となる。: When it exceeds 17%, it becomes black and remains glassy, remains on the slab surface even after descaling, and contributes to surface defects.
Ａｌ２Ｏ３：１０％以下の添加により１１００℃以上の
高温域にてガラスの粘性が向上し、スラブとの密着性が
確保される。By adding Al 2 O 3 : 10% or less, the viscosity of the glass is improved in a high temperature range of 1100 ° C. or more, and the adhesion with the slab is secured.
Ｌｉ２Ｏ：５％以下の添加により、高温でのガラス粘性
が向上し、スラブとの密着性が確保される。Addition of Li 2 O: 5% or less improves the glass viscosity at high temperature and secures the adhesion with the slab.
なお、ＭｇＯは必須成分ではないが、ガラス釉薬として
作用させるため、０．５％程度添加することが望まし
い。Although MgO is not an essential component, it is desirable to add about 0.5% because it acts as a glass glaze.
他の組成については、必ずしも限定するものではない。Other compositions are not necessarily limited.
又、酸化防止剤の膜厚の限定理由は次の通りである。The reasons for limiting the film thickness of the antioxidant are as follows.
膜厚：５０μ以下の場合は、酸化防止効果が不充分であ
る。When the film thickness is 50 μm or less, the antioxidant effect is insufficient.
：３００μ以上を超えると原単位が悪くなり経済的
効果が減少する。: When it exceeds 300 μ, the basic unit is deteriorated and the economic effect is reduced.
酸化防止剤の塗布方法としては、ハケによる手塗や、機
械による吹付塗布であってもよい。塗布はスラブの略全
面が好ましいが、必ずしも限定するものではない。The antioxidant may be applied by hand coating by brush or spray coating by machine. The coating is preferably performed on the substantially entire surface of the slab, but is not limited thereto.
更にスラブの加熱保持温度を１１００〜１２００℃と限
定した理由は、第１，２図の理由による。１１００℃以
下だと変形抵抗が高く（第１図）、熱間連続圧延機にて
圧延し難く、高温捩り試験においても捩り回数が少なく
（第２図）、スラブの変形能が低く割れが発生し易く表
面疵も多くなり好ましくない。Further, the reason for limiting the heating and holding temperature of the slab to 1100 to 1200 ° C. is based on the reason shown in FIGS. If the temperature is 1100 ° C or lower, the deformation resistance is high (Fig. 1), it is difficult to roll with a hot continuous rolling mill, the number of twists is small even in the high temperature torsion test (Fig. 2), the deformability of the slab is low, and cracks occur. It is not preferable because it is easy to do and surface defects are increased.
１２００℃を超えると本発明で用いる酸化防止剤を用い
ても粒界酸化が激しく、高温捩り試験に於ける捩り回数
も少なく（第２図）耳割れ等の表面疵の発生が多くなり
好ましくない。又、本発明でいう熱間連続圧延機とは、
ホットストリップミルのような圧延機のことであり、ス
テッケル、プラネタリーミル等は含まない。If the temperature exceeds 1200 ° C, grain boundary oxidation is severe even when the antioxidant used in the present invention is used, and the number of twists in the high temperature twist test is small (Fig. 2). . Further, the hot continuous rolling mill in the present invention,
It refers to rolling mills such as hot strip mills, and does not include steckels, planetary mills, etc.
作 用 高Ｎｉ−Ｆｅ合金鋼のスラブに塗布する前記成分よりな
る酸化防止剤は、スラブの表面に粘性のガラス質で、密
着性の高い保護膜を形成する。この保護膜は高い酸化防
止機能を有し、しかも炉内で容易に破損することがな
く、スラブの表面を外気から完全に遮断する。また、ス
キッドからの低温伝播を阻止し、スラブのスキッドとの
接触部分の温度低下を防止する。The antioxidant composed of the above components, which is applied to the slab of the working Ni-Fe alloy steel, forms a viscous vitreous protective film having high adhesion on the surface of the slab. This protective film has a high anti-oxidation function, does not easily break in the furnace, and completely shields the surface of the slab from the outside air. Further, it prevents low temperature propagation from the skid and prevents the temperature of the slab from coming into contact with the skid.
したがって、従来一般に行われていたように、スラブ表
面に酸化防止剤（ＳｉＯ２−Ａｌ２Ｏ３−ＭｇＯ−Ｃａ
Ｏ系）を塗布した上で、さらに鋼板による梱包を行った
り、あるいは特開昭５９−５６５１９号の発明のよう
に、スラブ表面に酸化防止剤（ＳｉＯ２−Ａｌ２Ｏ３−
ＭｇＯ−ＣａＯ系）を塗布した上で、さらに該スラブの
スキッドとの接触部分にスペーサーを介在させたりする
必要がなく、単に前記組成よりなる酸化防止剤をスラブ
表面に塗布しておくだけで粒界酸化の生じ難い比較的低
温の加熱による圧延を実施することができ、耳割れ、表
面疵のない高Ｎｉ合金熱延板に仕上げることができる。Therefore, the antioxidant (SiO 2 —Al 2 O 3 —MgO—Ca) is formed on the surface of the slab, as is conventionally done.
(O type) and then further packed by a steel plate, or as in the invention of JP-A-59-56519, an antioxidant (SiO 2 —Al 2 O 3 —
(MgO-CaO system), it is not necessary to further interpose a spacer in the contact portion of the slab with the skid, and an antioxidant having the above composition is simply applied to the slab surface. It is possible to carry out rolling by heating at a relatively low temperature at which field oxidation hardly occurs, and it is possible to finish a high Ni alloy hot-rolled sheet without edge cracks and surface flaws.
実 施 例 表２の成分からなる高Ｎｉ−Ｆｅ合金鋼を溶製し連続鋳
造気により製造したスラブ（長さ5000〜８０００mm×巾
９００〜１２５０mm×厚さ１３０〜１８０mm）の略全面
に表３の組成を有する酸化防止剤を厚さ２００μにハケ
で塗布した。該スラブを１１８０℃×５Ｈｒ加熱保持
後、ホットストリップミルにより、厚さ４．５〜６．０
mm、巾９００〜１２５０mmの熱延鋼板を製造し、Ａ,B，
Ｃ，３個のテスト鋼板を採取した。Practical Examples Table 3 is formed on substantially the entire surface of a slab (length 5000 to 8000 mm x width 900 to 1250 mm x thickness 130 to 180 mm) produced by continuous casting with a high Ni-Fe alloy steel composed of the components shown in Table 2. An antioxidant having the above composition was applied by a brush to a thickness of 200 μm. The slab was heated and held at 1180 ° C. for 5 hours, and then heated by a hot strip mill to a thickness of 4.5 to 6.0.
mm, width 900 ~ 1250mm hot rolled steel sheet is manufactured,
C, three test steel plates were taken.
採取した３個(Ａ，Ｂ，Ｃ)のテスト鋼板と、従来法鋼板
（成分、スラブサイズ、熱鋼板サイズは本発明法と同
一、但し酸化防止剤の組成は、ＳｉO2：６％、Ａl2O3：
１．０％、MgO：６３．２％、CaO：０．８％、塗布厚さ
４００μ、加熱および時間：1090℃×５Ｈｒ、よりテス
ト鋼板１個を採取）との耳割れ発生率を第３図に示す
が、従来の１２％が２％〜４％に大巾低下した。更に疵
取指数を第４図に示すが、従来の３．１が２〜２．８に
向上した。 Three (A, B, C) test steel plates sampled and a conventional steel plate (components, slab size, hot steel plate size are the same as those of the method of the present invention, except that the composition of the antioxidant is SiO 2 : 6%, Al 2 O 3 :
1.0%, MgO: 63.2%, CaO: 0.8%, coating thickness 400μ, heating and time: 1090 ° C × 5Hr, a test steel plate was collected) As shown in the figure, the conventional 12% is greatly reduced to 2% to 4%. Further, as shown in FIG. 4, the defect removal index is improved from 3.1 of the prior art to 2 to 2.8.
発明の効果 以上述べたように、本発明によれば、高Ｎｉ合金鋼スラ
ブの表面に酸化防止剤を塗布しておくだけで、該スラブ
を粒界酸化の生じ難い比較的低い温度域で熱間圧延する
ことが可能となる。Effects of the Invention As described above, according to the present invention, by simply applying an antioxidant to the surface of a high Ni alloy steel slab, the slab is heated in a relatively low temperature range in which grain boundary oxidation hardly occurs. It becomes possible to carry out hot rolling.
したがって、耳割れおよび表面疵のない高品質の高Ｎｉ
−Ｆｅ合金熱延鋼板を極めて生産性よく製造することが
できる。Therefore, high quality, high Ni without ear cracks and surface flaws
-Fe alloy hot rolled steel sheet can be manufactured with extremely high productivity.
第１図は、本発明の高Ｎｉ−Ｆｅ合金鋼板の加熱温度と
変形抵抗の関係を示す。 第２図は、本発明の高Ｎｉ−Ｆｅ合金鋼板の加熱温度と
捩り回数の関係を示す。 第３図は、従来法および本発明法と耳割れ発生率の関係
を示す。 第４図は、従来法および本発明法と疵取指数の関係を示
す。FIG. 1 shows the relationship between the heating temperature and the deformation resistance of the high Ni—Fe alloy steel sheet of the present invention. FIG. 2 shows the relationship between the heating temperature and the number of twists of the high Ni—Fe alloy steel sheet of the present invention. FIG. 3 shows the relationship between the conventional method and the method of the present invention and the ear crack occurrence rate. FIG. 4 shows the relationship between the conventional method and the method of the present invention and the flaw removal index.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２２Ｃ 38/08 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C22C 38/08
Claims (1)
ｒ：６％以下、Ｃ：０．０２％以下、Ｓｉ≦０．３０
％、Ｍｎ≦０．８０％、残部Ｆｅおよび不可避的不純物
よりなる鋼の連続鋳造スラブから熱延鋼板を製造する方
法において、連続鋳造後のスラブ表面に主要成分として
ＳｉＯ２１５〜１７重量％、Ａｌ２Ｏ２≦１０重量％、
Ｃｒ２Ｏ３６０〜７０重量％、Ｌｉ２Ｏ≦５重量％を含
む酸化防止剤を膜厚５０〜３００μ塗布し、該スラブを
１１００〜１２００℃の温度域に加熱保持後、熱間連続
圧延することを特徴とする耳割れおよび表面疵のない高
Ｎｉ−Ｆｅ合金熱延鋼板の製造方法。1. In weight%, Ni: 20-80%, C
r: 6% or less, C: 0.02% or less, Si ≦ 0.30
%, Mn ≦ 0.80%, balance Fe and inevitable impurities in the method of producing a hot-rolled steel sheet from a continuously cast slab, in the slab surface after continuous casting, SiO 2 15 to 17 wt% as a main component, Al 2 O 2 ≦ 10% by weight,
An antioxidant containing 60 to 70% by weight of Cr 2 O 3 and 5% by weight of Li 2 O is applied to a film thickness of 50 to 300 μm, the slab is heated and held in a temperature range of 1100 to 1200 ° C., and then hot continuous rolling is performed. A method for producing a high Ni—Fe alloy hot-rolled steel sheet free from edge cracks and surface defects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61111224A JPH066744B2 (en) | 1986-05-15 | 1986-05-15 | Method for manufacturing high Ni-Fe alloy hot rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61111224A JPH066744B2 (en) | 1986-05-15 | 1986-05-15 | Method for manufacturing high Ni-Fe alloy hot rolled steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62267457A JPS62267457A (en) | 1987-11-20 |
| JPH066744B2 true JPH066744B2 (en) | 1994-01-26 |
Family
ID=14555685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61111224A Expired - Lifetime JPH066744B2 (en) | 1986-05-15 | 1986-05-15 | Method for manufacturing high Ni-Fe alloy hot rolled steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066744B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250919A (en) * | 1988-04-15 | 1990-02-20 | Nippon Mining Co Ltd | Production of iron-nickel based alloy material for shadow mask |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1123187B (en) * | 1979-09-17 | 1986-04-30 | Lpb Ist Farm | PROCESS FOR THE PREPARATION OF L-ALPHA-GLYCERYLPHOSPHORYLCHOLINE |
| JPS58133320A (en) * | 1982-02-04 | 1983-08-09 | Kawasaki Steel Corp | Oxidation inhibitor of steel material |
| JPS5956519A (en) * | 1982-09-27 | 1984-04-02 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled high ni alloy steel plate |
-
1986
- 1986-05-15 JP JP61111224A patent/JPH066744B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62267457A (en) | 1987-11-20 |
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