JPS60244447A - Production of clad steel ingot - Google Patents
Production of clad steel ingotInfo
- Publication number
- JPS60244447A JPS60244447A JP9761084A JP9761084A JPS60244447A JP S60244447 A JPS60244447 A JP S60244447A JP 9761084 A JP9761084 A JP 9761084A JP 9761084 A JP9761084 A JP 9761084A JP S60244447 A JPS60244447 A JP S60244447A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- base metal
- metal
- cladding
- gas
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/02—Casting compound ingots of two or more different metals in the molten state, i.e. integrally cast
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はクラッド鋼塊の製造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing a clad steel ingot.
クラツド鋼板の一製造方式として鋳込圧延法が知られて
おシ、一般にこの方式では、合せ材（芯材）たるスラブ
又は厚板を母材溶鋼で鋳包んで鋳塊を作シ、これを易塊
圧延→板圧延することによシフラッド鋼板が製造される
。The cast rolling method is known as a manufacturing method for clad steel sheets. Generally, in this method, a slab or thick plate serving as a core material is cast with base material molten steel to create an ingot. Syfrad steel plate is manufactured by easy rolling → plate rolling.
しかしながらこの方式では、母材溶鋼の鋳込時に母材と
合せ材との界面に溶鋼中のスラグ系介在物や浮遊スカム
が巻き込まれ、この結果その界面の清浄度が害され、製
品の品質を低下させるという問題がある。このような問
題に対し、従来ブラヌチツク等の有機材料やＺｎ等の低
沸点金属のコーティングを合せ材表面に予め施すことに
よシ、鋳込中における合せ材／母材の界面にガス被膜を
形成させるようにし、これによって合せ材表面に異物が
直接接触することを防止したシ、或いは合せ材周辺に耐
火物等からなる可動式の隔壁を設け、合せ材と母材溶鋼
との直接接触を機械的に防止したシすることによシ、ス
カム等の巻き込み防止を図るようにした方法が提案され
ているが、母材と合せ材とはいずれ直接接触するもので
あるため、このような方法は一時的な巻込防止対策に過
ぎず、スラグ等の巻き込みの安定した防止対策としては
不十分なものである。However, with this method, slag-based inclusions and floating scum in the molten steel are drawn into the interface between the base metal and the laminate when the base metal molten steel is poured, which impairs the cleanliness of the interface and impairs the quality of the product. There is a problem of lowering To solve this problem, conventional methods have been used to form a gas film at the interface between the laminate and the base material during casting by coating the laminate surface with an organic material such as Branuchiku or a low-boiling metal such as Zn in advance. This prevents foreign matter from coming into direct contact with the surface of the laminate, or a movable partition wall made of refractory material is installed around the laminate to prevent direct contact between the laminate and the base molten steel. A method has been proposed in which the entrainment of scum, scum, etc. is prevented by preventing the entrapment of scum, etc. This is only a temporary measure to prevent entrainment, and is insufficient as a stable measure to prevent entrainment of slag, etc.
また以上のような鋳込圧延法では、分塊圧延等の圧延過
程で合せ利と母材との溶着接合性の確保が図られるが、
一般にその溶着接合性を十分に確保するためには合せ材
を母材溶鋼に完全に鋳包む必要があシ、そのため−員歩
留が悪く製造コストが高いという難点がある。In addition, in the above-mentioned cast rolling method, the welding and bonding properties between the weld and the base material are ensured during the rolling process such as blooming, but
In general, in order to ensure sufficient weld bondability, it is necessary to completely cast the cladding material into the base metal molten steel, which has the disadvantage of poor production yields and high manufacturing costs.
本発明はこのような従来の問題点に鑑み創案されたもの
で、母材と合せ材の界面への異物巻き込みを防止し、し
かも両材料の密着性を適切に確保することができる方法
を提供せんとするものである。The present invention was devised in view of these conventional problems, and provides a method that can prevent foreign matter from getting caught in the interface between the base material and the laminate, and can also ensure appropriate adhesion between the two materials. This is what I am trying to do.
このため本発明は、鋳型内に位置せしめられた合せ材の
母材と接合すべき面と対向するようにしてパネル状のガ
ス燃焼加熱体を配置し、該ガス燃焼加熱体により、該加
熱体と合せ材間に形成される燃焼空間の燃焼ガス雰囲気
中の０２濃度が２．０％以下どなるよう燃料ガスの空気
比ｔ−調整しつつ、合せ材の母材と接合すべき面を溶融
しない程度に予熱し、しかる後母材溶鋼を鋳込み、少な
くとも前記予熱途中から鋳込み終了までの混銑型内空間
に不活性又は弱還元性置換ガスを供給するようにしたも
のてあシ、かかる構成により、合せ材との界面における
母材溶鋼の凝固速度が小さくなることによってスラグ、
スカム等の異物の浮上性が確保され、それら異物の母材
・合せ財界面への巻込みが適切に防止される。加えて、
合せ材の過度の再溶解を抑えつつ母材と合せ材とを適切
に溶着接合せしめることができ、鋳造段階で健全な界面
密着性が得られる。合せ材の予熱において、合せ材を再
溶解する程度に過度に加熱すると、母材溶鋼成分がその
厚み方向で変化したυ、合せ材と母材との界面部に画材
質の混合層（成分遷移層）が相当の厚みで形成されると
いう好ましくない結果を招くものであシ、これに対し本
発明によれば、合せ材は母材溶鋼と接触してはじめてそ
の表層部が半溶融又は溶融状態となり、その表層部のみ
が母材溶鋼と溶融混合し、このため薄い混合層により適
切な溶着状態が得られる。加えて、本発明では加熱体と
合せ材間の燃焼ガス雰囲気中０２＃度が規制され且つ少
なくとも予熱途中から鋳型内に不活性若しくは弱還元ガ
スを供給し続けるため合せ材の高温酸化が適切に抑えら
れる。Therefore, in the present invention, a panel-shaped gas combustion heating element is arranged so as to face the surface to be joined to the base material of the laminate placed in the mold, and the heating element is heated by the gas combustion heating element. While adjusting the air ratio of the fuel gas so that the 02 concentration in the combustion gas atmosphere in the combustion space formed between the laminate and the laminate is 2.0% or less, the surface of the laminate that is to be joined to the base material is not melted. With this configuration, the iron mixer is preheated to a certain degree, and then the base metal molten steel is poured, and an inert or weakly reducing displacement gas is supplied to the inner space of the mixed pig iron mold at least from the middle of the preheating to the end of casting. Slag,
The floating property of foreign matter such as scum is ensured, and the entrainment of such foreign matter into the base material/combined material interface is appropriately prevented. In addition,
The base material and the cladding material can be appropriately welded and joined while suppressing excessive re-melting of the cladding material, and sound interfacial adhesion can be obtained at the casting stage. When preheating the laminate, if the laminate is heated excessively to the extent that it remelts, the molten steel composition of the base material changes in the thickness direction, and a mixed layer of art material (component transition) occurs at the interface between the laminate and the base material. However, according to the present invention, the surface layer of the laminated material does not reach a semi-molten or molten state until it comes into contact with the base material molten steel. Therefore, only the surface layer melts and mixes with the base metal molten steel, so that a suitable welding state can be obtained with a thin mixed layer. In addition, in the present invention, the temperature in the combustion gas atmosphere between the heating element and the laminate is regulated, and the inert or weakly reducing gas is continued to be supplied into the mold at least during preheating, so that the high temperature oxidation of the laminate is properly performed. It can be suppressed.
第１図は本発明による２層クラッド鋼塊の一製造工程例
を示すもので、（１）は下注き定盤、（２）はこの定盤
上に設置された鋳型、（３）は湯道煉瓦である。Figure 1 shows an example of the manufacturing process of a two-layer clad steel ingot according to the present invention, in which (1) is a bottom pouring surface plate, (2) is a mold placed on this surface plate, and (3) is a mold placed on this surface plate. It is made of hot water brick.
まずクラッド用の合せ材（４）（スラブ）を鋳型（２）
内に入れ、鋳型側壁に密着するようにして支持具（６）
を介して固定する。この合せ材（４）は上方からの懸架
、或いは鋳型壁や定盤からの支持等、適当な手段によシ
固定することができる。First, place the cladding material (4) (slab) into the mold (2).
Insert the support tool (6) into the mold so that it is in close contact with the side wall of the mold.
Fixed via. This mating material (4) can be fixed by any suitable means, such as suspension from above or support from a mold wall or surface plate.
この状態で鋳型（２）内にパネル状のガス燃焼加熱体（
５）ヲ吊り入れ、合せ材（４）に対向するようにして位
置せしめ、合せ材（４）の母材と接合すべき面（４１）
（以下接合面（４１）と称す〕を加熱する。この加熱
は上記接合面（４１）が溶融しない程度の温度で行われ
る。この接合面（４１）の加熱は一般に４００−１２０
０℃の温度域で行われる。温度が４００℃未満では目的
とする予熱効果が得られず、また一般に１２００１：程
度を超える温度域では合せ材の溶融がはじまる。また、
ガス燃焼加熱体（５）には、該加熱体と合せ材間に形成
される燃焼空間（Ｓ）の燃焼ガス雰囲気中の０２濃度が
２．０％以下となるよう空気比（気体燃料／空気）が調
整された燃料ガスが供給される。気体燃料と空気とはガ
ス混合装許（図示せず）で予め混合され、導入管（７）
を通じて加熱体（５）に供給される。上記燃焼ガス雰囲
気中の０２濃度が２０％を超えると、合せ材（４）の加
熱面表面温度が特に８００℃を超えるような高温域にな
った場合、被加熱面に母材との密着性を害するよう々高
温酸化皮膜が形成し易くなり、したがって燃料ガスは上
記０２濃度が２．０％以下となるよう空気比が規制され
る。In this state, a panel-shaped gas combustion heating element (
5) Hang it and position it so that it faces the laminate material (4), and the surface (41) to be joined to the base material of the laminate material (4).
(hereinafter referred to as the bonding surface (41)). This heating is performed at a temperature that does not melt the bonding surface (41). Generally, the heating of the bonding surface (41) is 400-120°C.
It is carried out in a temperature range of 0°C. If the temperature is less than 400°C, the desired preheating effect cannot be obtained, and in general, in a temperature range exceeding about 12001:, the laminate starts to melt. Also,
The gas combustion heating element (5) has an air ratio (gaseous fuel/air ) is supplied with adjusted fuel gas. The gaseous fuel and air are mixed in advance in a gas mixing device (not shown), and the inlet pipe (7)
is supplied to the heating element (5) through. When the 02 concentration in the combustion gas atmosphere exceeds 20%, the surface temperature of the heated surface of the laminate (4) reaches a high temperature range exceeding 800°C, and the adhesion of the heated surface to the base material Therefore, the air ratio of the fuel gas is regulated so that the 02 concentration is 2.0% or less.
また合せ材（４）の予熱は、その周縁部を中央部よりも
高温となるように加熱することが好ましく、これによシ
加熱体（５）を取シはずし母材溶鋼を下注ぎ注入するま
での間に温度降下しやすい周縁部温度を母材溶鋼と接触
する時点で中央部温度とｔＩＩη温度に維持することが
可能となシ、その結果、全面に亘って完全な溶着性を確
保することができる。In addition, it is preferable to preheat the laminate material (4) so that its peripheral portion is heated to a higher temperature than the center portion, so that the heating element (5) is removed and the base metal molten steel is poured downward. It is possible to maintain the temperature at the periphery, where the temperature tends to drop during the process, at the center temperature and tIIη temperature at the time of contact with the base metal molten steel, and as a result, perfect weldability is ensured over the entire surface. be able to.
上記加熱後、ガス燃焼加熱体（５）を鋳型（２）から速
かに取シ出し、合せ材（４）の接合面が所定の温度範囲
にあるうちに母材溶鋼を下注ぎで鋳込み、母材と合せ材
（４）とを溶着接合せしめる。After the above-mentioned heating, the gas combustion heating element (5) is quickly removed from the mold (2), and while the joint surface of the mating material (4) is within a predetermined temperature range, the base metal molten steel is poured by bottom pouring, The base material and the laminate material (4) are welded and joined.
このような母材溶鋼の鋳込み過程において、合せ材（４
）との界面近傍における母材溶鋼の凝固が前記合せ材（
４）の予熱によって遅されるため、ス２グやスカム等の
異物が浮上する時間的余裕が与えられ、それら異物の合
せ材界面での捕捉が適切に防止される。一方、予熱され
ている合せ拐（４）の接合面表層部は母材溶鋼との接触
によシ半溶融又は溶融状態となシ、これによシ母材溶銅
との適切な界面密着性が得られる。In the process of casting base metal molten steel, a mating material (4
) The solidification of the base metal molten steel near the interface with the bonding material (
Since the preheating is delayed by the preheating step 4), time is provided for foreign matter such as scum and scum to float, and capture of such foreign matter at the interface of the composite material is appropriately prevented. On the other hand, the surface layer of the joint surface of the preheated joint plate (4) becomes semi-molten or molten due to contact with the base metal molten steel, thereby ensuring appropriate interfacial adhesion with the base metal molten copper. is obtained.
また、以上の予熱及び鋳込工程において、合せ材の高温
酸化を抑えるため、少なくとも予熱工程途中から鋳込み
終了までの間、鋳型内空間に不活性又は弱還元性置換ガ
スが導入管（８）を通じて供給される。この置換ガスと
しては例えばＡｒガス又はＡｒ ＋ Ｈｚガスか用いら
れ、これによシ上記合せ材の接合面（４１）の高温酸化
が抑えらｉする。In addition, in the above preheating and casting process, in order to suppress high-temperature oxidation of the composite material, an inert or weakly reducing substitution gas is supplied to the mold interior space through the introduction pipe (8) at least from the middle of the preheating process until the end of casting. Supplied. As this replacement gas, for example, Ar gas or Ar + Hz gas is used, and this suppresses high-temperature oxidation of the bonding surface (41) of the above-mentioned bonding material.
上記導入管（８）は母材溶鋼の鋳込み中溶湯面に合せて
上昇せしめる」：うにするごともできるが、組合によっ
てＶ、母材溶鋼によシ容易に溶＃ Ｌ、 得る薄肉管を
固定的に鋳型内に設けるようにしてもよい。The above-mentioned introduction pipe (8) is raised to match the molten metal surface during pouring of the base metal molten steel.Although it can be done in this way, it is possible to fix the thin-walled pipe to obtain the molten metal #L easily by V and the base metal molten steel by combination. Alternatively, it may be provided within the mold.
なお、合せ材（４）の高温酸化をよシ効果的に抑えるた
め、予８段階では固体又は半溶融状態であり、母材溶鋼
との接触直前に完全溶融するような成分系を有するよう
な公知の非晶質フラックスを、合せ材の接合面（４１）
に予め塗布しておくことが好ましい。In addition, in order to more effectively suppress high-temperature oxidation of the laminate material (4), it should be in a solid or semi-molten state at the preliminary stage 8 and have a composition system that completely melts immediately before contact with the base molten steel. A known amorphous flux was applied to the bonding surface (41) of the laminating material.
It is preferable to apply the coating in advance.
第４図ないし第６図は前記ガス燃焼加熱体（５）の詳細
を示すもので、この加熱体（５）は合せ材を容入し得る
ようＮ ｆ”ｉ面が開口したボックス状の本体（９）ｆ
有し、該本体（９）には耐火キャスタ０Ｑが内張シされ
ている。本体（９）には、多数の燃料吹込用の管体ａη
（ステンレス製絹管）がその端部開口によシ本体内面（
耐火キャスタ面）にガス吹出口（６）が形成されるよう
にして設けられるとともに、該管体０１）は本体（９）
の背面部に設けられたヘッダα１に接続され１されに該
ヘッダ０壕には前記導入管（７）が接続されている。本
実施例では、本体（９）の内側に容入された合せ材（４
）の周縁をその中心部に対して強く加熱できるようにす
るため、前記管体ＣＩη杜本鉢本体）の中央部に較べ周
辺部が密になるよう配設され、しかも本体（９）の中央
部の管体ａηと周辺部の管体αυとは、それぞれ別のヘ
ッダ（１３ａＸＩ３ｂ）と導入管（７ａＸ７ｂ）とによ
シ燃料が供給されるようになっている。その他、図面に
おいて０４は加熱体の吊り下げ支持部、０９は合せ材（
４）の支持具を容入せしめるため本体（９）の上部及び
下部に形成される凹欠部である。Figures 4 to 6 show details of the gas combustion heating element (5), which is a box-shaped body with an opening on the N f''i surface so as to accommodate the laminate. (9) f
The main body (9) is lined with fireproof casters 0Q. The main body (9) includes a large number of fuel injection pipes aη.
(stainless steel silk tube) is inserted into the inner surface of the main body (
A gas outlet (6) is formed on the fireproof caster surface), and the pipe body 01) is connected to the main body (9).
The introduction pipe (7) is connected to the header α1 provided on the back side of the header 1, and the introduction pipe (7) is connected to the header 0 trench. In this embodiment, the lining material (4) contained inside the main body (9) is
In order to be able to heat the periphery of the body (9) strongly relative to its center, the periphery of the pipe body (9) is arranged so as to be denser than the center of the body (9). The pipe body aη in the section and the pipe body αυ in the peripheral part are supplied with fuel through separate headers (13aXI3b) and introduction pipes (7aX7b), respectively. In addition, in the drawing, 04 is the hanging support part of the heating element, and 09 is the laminating material (
These are recessed notches formed in the upper and lower parts of the main body (9) to accommodate the supporting tools (4).
また前記耐火キャスタｃＩＩの表面には各ガス吹出口α
ａを中心とした凹部が形成され、加熱効率が増加するよ
うな配慮がなされている。In addition, each gas outlet α is provided on the surface of the fireproof caster cII.
A concave portion centered at point a is formed to increase heating efficiency.
第２図は２Ｍクラッド鋼塊の他の製造例を示すもので、
２枚重ねの合せ材（４ａ） （４ｂ） ｋ鋳型（２）の
中央に支持具（６）を介して懸架せしめ、その両側から
ガス燃焼加熱体（ｓａ） （ｓｂ）で予熱するものであ
シ、その他の構成については第１図に示す実施例と同様
である。本実施例では母材溶鋼の鋳込、凝固稜重合した
合せ材（４ａ〕（４ｂ）が剥離せしめられ、１対の２層
クラッド鋼塊が得られる。Figure 2 shows another example of manufacturing a 2M clad steel ingot.
Two laminated materials (4a) (4b) K are suspended in the center of the mold (2) via a support (6), and preheated from both sides with gas-fired heating elements (SA) (SB). The other configurations are the same as those of the embodiment shown in FIG. In this example, the base material molten steel is cast, the solidified edge-polymerized laminates (4a) (4b) are peeled off, and a pair of two-layer clad steel ingots are obtained.
寸だ第３図は３層クラッド鋼塊（合せ材が２層の鋼塊）
の製造例を示すものて、鋳型（２）の対向する壁にそれ
ぞれ合せｌ／Ａ’ （４ａ） （４ｂ） ｖｌ−支持具
を介して固定し、各合せ材（４ａ） （４ｂ）に対応し
た加熱体（ｓａ） （５ｂ）によシ予熱するものであシ
、これもその他の構成については第１図に示す実施例と
同様である。Figure 3 shows a three-layer clad steel ingot (a steel ingot with two layers of cladding material)
This is an example of manufacturing 1/A' (4a) (4b) vl- fixed to opposing walls of mold (2) via supports, corresponding to each mating material (4a) (4b). Preheating is performed by a heated heating element (sa) (5b), and this is also the same as the embodiment shown in FIG. 1 with respect to other configurations.
・実施例
１５）ン鋼塊を得る下注ぎ鋳型６本を下注ぎ用定盤に据
え、合せ材として５ＵＳ−３０４、母材として４０キロ
級Ａｔ−８ｉキルド鋼をそれぞれ用い、第１図、第２図
及び第３図に各示す本発明法及び従来の鋳包法でクラッ
ド鋼塊を製造した。・Example 15) Six bottom pouring molds for obtaining a steel ingot were placed on a bottom pouring surface plate, 5US-304 was used as the cladding material, and 40 kg class At-8i killed steel was used as the base material. Clad steel ingots were manufactured by the method of the present invention and the conventional casting method shown in FIGS. 2 and 3, respectively.
その製造条件は以下の通シである。なお、本発明で社第
４図ないし第６図に示されるような構造め加熱体を使用
し、Ｃガスに空気を所交の割合で予混合した燃料ガスに
よシ合せ材の予熱を実施し、この予熱途中から鋳込み終
了までの間、鋳型内空間に不活性弱還元性ガス（置換ガ
ス）を供給した。The manufacturing conditions are as follows. In addition, in the present invention, a heating element having a structure as shown in FIGS. 4 to 6 is used to preheat the joining material with fuel gas prepared by premixing C gas and air at a given ratio. From the middle of this preheating to the end of casting, an inert weakly reducing gas (replacement gas) was supplied to the mold interior space.
短辺 長辺 高さ
０鋳型内側形状： ８８０ Ｘ １０５０ Ｘ ２７０
０厚み 幅 高さ
０合せ財形状： ２２０ Ｘ １０００ Ｘ ２０００
０鋳造条件
（１ン注湯溶鋼温度 ： １５８０℃
（２）鋳型内湯上シ速度：平均４００ ｍｍ／ｍｉ ｎ
０合せ付加熱条件（本発明法）
（１）予熱時間 ： ９０〜１２０ｍ１ｎ（２）予熱温
度 ２８００〜１２００℃０燃料ガス空気比： １５（
空気／燃料のＶｏ ｌ ｕｍｅ比）以上の条件で鋼塊を
製造し、この鋼塊を分塊圧延してスラブと力し、このス
ラブ段階での合せ材と母材の接着性及び界面清浄性を超
音波探傷法によシ調べた。さらにそのスラブを鋼板まで
成品圧延し、その−貫歩留を調べた。それらの結果を第
１表に示す。Short side Long side Height 0 Mold inner shape: 880 x 1050 x 270
0 Thickness Width Height 0 Combined product shape: 220 x 1000 x 2000
0 casting conditions (1-inch pouring molten steel temperature: 1580°C (2) Molten rising speed in mold: average 400 mm/min
0 matching additional heat conditions (method of the present invention) (1) Preheating time: 90 to 120 m1n (2) Preheating temperature 2800 to 1200°C 0 Fuel gas air ratio: 15 (
A steel ingot is manufactured under the above conditions (air/fuel volume ratio), this steel ingot is bloomed and pressed into a slab, and the adhesion and interfacial cleanliness of the laminate and base material at this slab stage are evaluated. were investigated using ultrasonic flaw detection. Furthermore, the slab was rolled into a steel plate, and its throughput was investigated. The results are shown in Table 1.
このように本発明法では、従来法に較べ母材７合せ材界
面の接着性と清浄性に優れたクラッド鋼塊が得られてお
シ、またこれによｐ−＊歩留も向上していることが判る
。As described above, in the method of the present invention, a clad steel ingot with superior adhesiveness and cleanliness at the interface of the base material 7 and the laminate material was obtained compared to the conventional method, and the p-* yield was also improved. I know that there is.
以上述べた本発明によれば、合せ材の接合面に高温酸化
被膜を形成せしめることなく、母材と合せ材の界面への
異物巻込みを適切に防止することができるとともに、母
材溶鋼成分がその厚み方向で変化したシ、合せ材と母材
との界面部に両材質が混合した厚い成分遷移層が形成さ
れたシすることなく合せ材と母材との適切な溶着状態を
得ることができ、このようなことからクラツド鋼板の製
品品質とその一貫歩留を従来に較べ大きく向上させるこ
とができる。According to the present invention described above, it is possible to appropriately prevent foreign matter from being entrapped at the interface between the base material and the laminate without forming a high-temperature oxide film on the bonding surface of the laminate, and also to To obtain an appropriate welding state between the laminate material and the base material without causing changes in the thickness direction of the laminate material and the formation of a thick component transition layer in which both materials are mixed at the interface between the laminate material and the base material. As a result, the product quality and consistent yield of clad steel sheets can be greatly improved compared to the conventional method.
第１図は本発明法を２層クラッド鋼塊の製造に適用した
場合の一実施例を示す説明図である。第２図は同じく他
の実施例を示す説明図である。第３図は本発明法を３層
クラッド鋼塊の製造に適用した場合の一実施例を示す説
明図である。第４図ないし第６図は本発明法で使用され
るガス燃焼加熱体を示すもので、第４図は斜視図、第５
図は縦断面図、第６図は水平断面図である。
図において、（１）は下注ぎ定盤、、＜２＞ｈ鋳型、（
４Ｘ４ａＸ４ｂ）は合せ材、（５）（５ａ）（５ｂ）は
ガス燃焼加熱体、（８ンは置換ガスの導入管、（４１）
は接合面、（Ｓ）は燃焼空間を各示す。
特許出願人 日本鋼管株式会社
発 明 者 宮 原 思
量 麦 １） 幹 雄
同 鈴 木 具
間 寺 １） 作
間 水 岡 誠 支
筒１図 第２図
第３図
＊４＠
ｉｇ５図
３FIG. 1 is an explanatory diagram showing an example in which the method of the present invention is applied to the production of a two-layer clad steel ingot. FIG. 2 is an explanatory diagram showing another embodiment. FIG. 3 is an explanatory diagram showing an example in which the method of the present invention is applied to the production of a three-layer clad steel ingot. Figures 4 to 6 show the gas combustion heating element used in the method of the present invention, with Figure 4 being a perspective view and Figure 5 being a perspective view.
The figure is a longitudinal sectional view, and FIG. 6 is a horizontal sectional view. In the figure, (1) is the bottom pouring surface plate, <2>h mold, (
4X4aX4b) is the laminating material, (5) (5a) (5b) is the gas combustion heating element, (8 is the replacement gas introduction pipe, (41)
indicates the joint surface, and (S) indicates the combustion space. Patent applicant: Nippon Kokan Co., Ltd. Inventor: Mugi Miyahara 1) Yudo Miki Suzuki Guma Tera 1) Makoto Mizuoka Sakuma Branch 1 Figure 2 Figure 3 *4 @ ig5 Figure 3
Claims (1)
母材溶鋼を鋳込んで合せ材と母材とを溶着せしめクラッ
ド鋼塊を製造する方法において、鋳型内に位置せしめら
れた合せ材の母材と接合すべき面と対向するようにして
パネル状のガス燃焼加熱体を配置し、該ガス燃焼加熱体
により、該加熱体と合せ材間に形成される燃焼空間の燃
焼ガス雰囲気中の０２濃度が２．０％以下となるよう燃
料ガスの空気比を調整しつつ、合せ材の母材と接合すべ
き面を溶融しない程度に予熱し、しかる後母材溶鋼を鋳
込み、少なくとも前記予熱途中から鋳込み終了までの混
銑型内空間に不活性又は弱還元性置換ガスを供給するこ
とを特徴とするクラッド鋼塊の製造方法０After placing the cladding slab or plank in the mold,
In a method of manufacturing a clad steel ingot by pouring base metal molten steel and welding the cladding material and the base metal, the cladding material placed in the mold is placed in a panel shape so as to face the surface to be joined to the base material. A gas-fired heating element is arranged, and the gas-fired heating element is used to heat the air of the fuel gas so that the 02 concentration in the combustion gas atmosphere in the combustion space formed between the heating element and the laminate is 2.0% or less. While adjusting the ratio, preheat the surface of the mating material to be joined to the base metal to an extent that it does not melt, and then pour the base metal molten steel, and fill the inner space of the pig iron mold with an inert or weak material from at least the middle of the preheating to the end of casting. Method 0 for producing a clad steel ingot characterized by supplying a reducing displacement gas
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761084A JPS60244447A (en) | 1984-05-17 | 1984-05-17 | Production of clad steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761084A JPS60244447A (en) | 1984-05-17 | 1984-05-17 | Production of clad steel ingot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60244447A true JPS60244447A (en) | 1985-12-04 |
Family
ID=14196983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9761084A Pending JPS60244447A (en) | 1984-05-17 | 1984-05-17 | Production of clad steel ingot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60244447A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109332656A (en) * | 2018-12-10 | 2019-02-15 | 东北大学 | A kind of prefabricated roller core heating device of continuous casting compound high speed steel roll and its application method |
| CN110039031A (en) * | 2019-04-11 | 2019-07-23 | 中国石油天然气集团有限公司 | A kind of device and its pouring procedure being poured bimetallic pipe billet |
| CN117324574A (en) * | 2023-10-25 | 2024-01-02 | 黄山众友耐磨材料有限公司 | Vacuum casting box and bimetal thermal composite casting technology based on same |
-
1984
- 1984-05-17 JP JP9761084A patent/JPS60244447A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109332656A (en) * | 2018-12-10 | 2019-02-15 | 东北大学 | A kind of prefabricated roller core heating device of continuous casting compound high speed steel roll and its application method |
| CN110039031A (en) * | 2019-04-11 | 2019-07-23 | 中国石油天然气集团有限公司 | A kind of device and its pouring procedure being poured bimetallic pipe billet |
| CN117324574A (en) * | 2023-10-25 | 2024-01-02 | 黄山众友耐磨材料有限公司 | Vacuum casting box and bimetal thermal composite casting technology based on same |
| CN117324574B (en) * | 2023-10-25 | 2024-05-31 | 黄山众友耐磨材料有限公司 | Vacuum casting box and bimetal thermal composite casting technology based on same |
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