JPH01313189A - Powder cutting method for stainless steel slab - Google Patents
Powder cutting method for stainless steel slabInfo
- Publication number
- JPH01313189A JPH01313189A JP14364988A JP14364988A JPH01313189A JP H01313189 A JPH01313189 A JP H01313189A JP 14364988 A JP14364988 A JP 14364988A JP 14364988 A JP14364988 A JP 14364988A JP H01313189 A JPH01313189 A JP H01313189A
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- iron powder
- preheating
- carrier gas
- stainless steel
- 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
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 19
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 title claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 38
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 38
- 239000012159 carrier gas Substances 0.000 claims abstract description 28
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- -1 at about 172 to 1/3 Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、最良の状態で且つ経済的に切断が行えるステ
ンレス鋼スラブのパウダーカッティング方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for powder cutting stainless steel slabs, which allows the cutting to be carried out in the best possible manner and economically.
ステンレス鋼スラブを切断するとき、特にこれが連続鋳
造されてくるステンレス鋼スラブである場合には、次工
程の目的に合わせた長さにステンレス鋼スラブを切断す
ることを切断不能に至ること無く効率的に且つ良好に行
わねばならない。When cutting a stainless steel slab, especially if it is a continuously cast stainless steel slab, it is efficient to cut the stainless steel slab to a length that suits the purpose of the next process without becoming uncut. It must be carried out in a good manner.
ところで、普通鋼のスラブの切断は通常のガス切断方法
により行われるが、ステンレス鋼は普通鋼に比較して熱
伝導率が１７２〜ｌ／３程度に小さいので、そのスラブ
の切断にはパウダーカッティング方法が用いられる。By the way, ordinary steel slabs are cut using the usual gas cutting method, but since stainless steel has a lower thermal conductivity than ordinary steel, at about 172 to 1/3, powder cutting is used to cut the slabs. method is used.
次に一般的なパウダーカッティング方法を図面により説
明する。第２図はガス切断に用いる軟管の火口の１例を
示しくイ）は縦断面図で（ロ）は同図（イ）中のＡ−Ａ
線断面図、第３図はパウダーカッティング実施状態の説
明図である。Next, a general powder cutting method will be explained with reference to the drawings. Figure 2 shows an example of a soft pipe crater used for gas cutting.
The line sectional view and FIG. 3 are explanatory diagrams of the state in which powder cutting is performed.
パウダーカッティングの基本になっているものは通常の
ガス切断（酸素切断とも言う）である。The basis of powder cutting is ordinary gas cutting (also called oxygen cutting).
これは、例えば第２図（イ）及び（ロ）に示す如き切断
酸素口１ａを囲んでその周囲に予熱用可燃性ガス口１ｂ
及び予熱酸素口１ｃがそれぞれ配置された火口１を有す
る軟管の各日から気体を切断個所に向って噴流せしめ、
外側の予熱用可燃性ガス（例えばＬＰＧ）及び予熱酸素
によって生じる予熱フレームにより目標個所が充分な燃
焼温度に加熱された予熱域に火口１の中心部から噴流し
ている純度の高い切断酸素を吹き付けると、その切断個
所が直ちに激しい酸化反応を起こして（この部分を酸化
反応部と言う）溶融酸化鉄となり、Ｎ！素気流の力でこ
の溶融酸化鉄を吹き飛ばすことによって行われる。This includes, for example, a preheating flammable gas port 1b surrounding the cutting oxygen port 1a as shown in FIGS. 2(a) and 2(b).
and a soft pipe having a crater 1 in which a preheating oxygen port 1c is respectively disposed, and a gas is jetted toward the cutting point from each day,
High-purity cutting oxygen jetted from the center of the crater 1 is blown into the preheating area where the target location is heated to a sufficient combustion temperature by the preheating flame generated by the external preheating combustible gas (for example, LPG) and preheated oxygen. The cut area immediately undergoes a violent oxidation reaction (this area is called the oxidation reaction area) and becomes molten iron oxide, resulting in N! This is done by blowing away this molten iron oxide using the force of a stream of bare air.
しかしながら、ステンレス鋼スラブの場合は通常のガス
切断方法のみでは溶融状態が不充分なために良好に切断
できない、そこでパウダーカッティング方法が採用され
ている。この原理は、通常用いられているガス切断方法
において、第３図に示す如く鉄粉２を乾燥空気又は窒素
を主とするキャリアガスにより火口１の近くの鉄粉供給
管３から酸化反応部６に向って噴射注入すると、鉄粉２
は予熱フレーム４を貫通するとき予熱された状態となっ
て酸化反応部６に達し、鉄粉２と切断酸素５とが反応し
て生じる酸化熱を利用して酸化反応部６の加熱を強めて
ステンレス鋼スラブの切断個所を溶融させ、切断を可能
にさせるのである。鉄粉２としては一般に粒径２０〜３
００声のものが使用される。However, in the case of stainless steel slabs, ordinary gas cutting methods alone cannot cut the slabs well because the molten state is insufficient, so powder cutting methods are employed. This principle is based on the commonly used gas cutting method, in which iron powder 2 is transferred from an iron powder supply pipe 3 near a crater 1 to an oxidation reaction section 6 using dry air or a carrier gas mainly composed of nitrogen, as shown in FIG. When injected toward the iron powder 2
When passing through the preheating frame 4, it reaches the oxidation reaction section 6 in a preheated state, and the oxidation heat generated by the reaction between the iron powder 2 and the cutting oxygen 5 is used to intensify the heating of the oxidation reaction section 6. This melts the stainless steel slab at the point where it will be cut, allowing it to be cut. Iron powder 2 generally has a particle size of 20 to 3
00 voices are used.
従来、ステンレス鋼スラブのパウダーカッティングにお
いては、切断酸素量（Ｎ ｒｎ’ ７分）と鉄粉供給Ｍ
、Ｃｇ１分）とは多い目の方が切断能力があり、そして
切断酸素量（Ｎ ｒｎ’ ７分）：鉄粉供給量（ｇ／分
）を１．５ ： （２００〜２５０）とすると最も良好
な結果が得られるとするのが通説であり、また鉄粉を供
給するキャリアガスの圧力は０．７〜０．８ｋｇ／ｆｆ
ｌが適正だと言われてきた。Conventionally, in powder cutting of stainless steel slabs, cutting oxygen amount (N rn' 7 minutes) and iron powder supply M
, Cg1min), the higher the cutting capacity, the greater the cutting capacity.If the cutting oxygen amount (Nrn' 7min): iron powder supply amount (g/min) is 1.5: (200-250), the most It is generally accepted that good results can be obtained, and the pressure of the carrier gas supplying the iron powder is 0.7 to 0.8 kg/ff.
It has been said that l is appropriate.
しかしながら、実際には上記従来の条件で行うと酸化反
応部６の溶融が不充分で、切断速度を上げようとすると
予熱や溶融が不足で吹上げが発生し、飛散した溶鋼が火
口１に付着して切断不能となって火口１の交換を強いら
れ、交換が間に合わない場合は連続鋳造停止に至ること
もあった。また切断速度が上げられないため、同じ位置
を時間をかけて切断することになり、切断ノロが多く発
生してロール表面やスラブ切断面に付着することが屡々
あった。このため、次工程でのスラブ手入れ時間や歩留
等へ影響を及ぼしコスト高となっていた。However, in reality, when the conventional conditions described above are used, the melting of the oxidation reaction zone 6 is insufficient, and when trying to increase the cutting speed, blow-up occurs due to insufficient preheating and melting, and the scattered molten steel adheres to the crater 1. When it became impossible to cut, the tip 1 had to be replaced, and if the replacement was not done in time, continuous casting could be halted. Furthermore, since the cutting speed cannot be increased, it takes a long time to cut at the same position, and a lot of cutting slag is generated and often adheres to the roll surface or the cut surface of the slab. For this reason, the slab cleaning time and yield rate in the next process are affected, resulting in high costs.
本発明の課題は、上記従来技術の欠点を解消し、最良の
状態で且つ経済的に切断が行えるようにステンレス鋼ス
ラブのパウダーカッティング方法の条件を定めることに
ある。SUMMARY OF THE INVENTION The object of the present invention is to eliminate the drawbacks of the prior art described above and to define conditions for a method for powder cutting stainless steel slabs so that the cutting can be carried out in the best possible condition and economically.
本発明考等は上記課題を解決するため、種々な検討を行
った。In order to solve the above-mentioned problems, the present inventors conducted various studies.
先ず、従来のパウダーカッティング条件で切断時の状態
を詳細にａｍした結果、切断個所から切断方向のわずか
な先にある酸化反応部６が安定且つ連続的に形成されて
おらず、噴射された鉄粉の酸化反応部６への供給状態も
良くないことが判明した。もともとこのパウダーカッテ
ィングにおいてはステンレス鋼の小さな熱伝導率に基づ
く酸化反応部６の加熱不足を補う目的で鉄粉２を供給し
てその酸化熱溶剤作用を利用して切断するのであるから
、その目的に反して酸化反応部６が安定して形成されて
いないことは改善すべき重要な事項である。更に、切断
後のスラブを観察すると未反応の鉄粉２が切断部付近に
多量に付着していた。First of all, as a result of a detailed analysis of the state during cutting under conventional powder cutting conditions, it was found that the oxidation reaction zone 6 located slightly ahead of the cutting point in the cutting direction was not stably and continuously formed, and the injected iron It was also found that the supply condition of the powder to the oxidation reaction section 6 was not good. Originally, in this powder cutting, iron powder 2 was supplied to compensate for the insufficient heating of the oxidation reaction part 6 due to the small thermal conductivity of stainless steel, and the cutting was performed using the oxidation thermal solvent action. On the other hand, the fact that the oxidation reaction portion 6 is not stably formed is an important matter that should be improved. Furthermore, when the slab after cutting was observed, a large amount of unreacted iron powder 2 was found to have adhered to the vicinity of the cut portion.
これらのことから鉄粉供給量が多いと鉄粉２の予熱不足
により却って酸化反応が妨げられ、またキャリアガス圧
が高いとキャリアガスによる冷却効果や鉄粉２の予熱フ
レーム４Ｎ３Ｍ時間短縮のために充分に鉄粉２が予熱さ
れないのではないかと考え、段階的に条件を変更して種
々検討を重ねた結果、供給される鉄粉２が予熱フレーム
４で予熱されて燃焼直前の状態となってから切断酸素５
と反応させて一気に燃焼させる条件が最適であること、
そしてこのような状態にするためには切断酸素量に対す
る鉄粉供給量及びキャリアガス圧は従来の通説よりも可
成り小さいところにその最適範囲があり、この条件を定
めることによって上記課題を解決できることを究明して
本発明を成した。For these reasons, if the amount of iron powder supplied is large, the oxidation reaction will be hindered due to insufficient preheating of iron powder 2, and if the carrier gas pressure is high, the cooling effect of the carrier gas and the preheating frame 4N3M time of iron powder 2 will be shortened. I thought that the iron powder 2 might not be sufficiently preheated, and as a result of various studies by changing the conditions step by step, I found that the supplied iron powder 2 was preheated in the preheating frame 4 and reached a state just before combustion. cutting oxygen from 5
The conditions for reacting with and combusting all at once are optimal;
In order to achieve this condition, the optimum range of the iron powder supply amount and carrier gas pressure relative to the cutting oxygen amount is much smaller than the conventional wisdom, and by setting these conditions, the above problems can be solved. The present invention was achieved by investigating the following.
以下、本発明に係るステンレス鋼スラブのパウダーカッ
ティング方法を図面によって詳細に説明する。Hereinafter, the method for powder cutting a stainless steel slab according to the present invention will be explained in detail with reference to the drawings.
第１図はキャリアガスの各種圧力における切断酸素量と
鉄粉供給量との比と切断速度との関係を示す図である。FIG. 1 is a diagram showing the relationship between the ratio of cutting oxygen amount to iron powder supply amount and cutting speed at various carrier gas pressures.
本発明方法はステンレス鋼スラブをパウダーカッティン
グするに当り、切断酸素量（８２７分）と鉄粉供給量（
ｇ／分）との比を１＝２５〜１：４０とし且つキャリア
ガスの圧力を０．２〜０．３ｋｇ／ｃｄとすることが特
徴である。The method of the present invention uses the amount of cutting oxygen (827 minutes) and the amount of iron powder supplied (
The carrier gas is characterized by having a ratio of 1=25 to 1:40 and a carrier gas pressure of 0.2 to 0.3 kg/cd.
このことは第１図から説明される。第１図はキャリアガ
スの圧力を０．１ｋｇ／ａＪ、 ０．２ｋｇ／ａ＃、
０．３ｋｇ／ｃｄ、 ０．５ｋｇ／ａＪ及び０．８ｋｇ
／ａｄの各種として用い、各圧毎に切断酸素量（Ｎｎ（
／分）と鉄粉供給ｔ （ｇ／分）との比（以下、酸素・
鉄粉比と言うことがある）を種々に変えて、そのときの
良好且つ安定状態で切断可能な最大切断速度（ｍ ／分
）との関係を長期間に亘って実験確認して集積したデー
ターに基づいて作成した図である。This is explained from FIG. Figure 1 shows carrier gas pressures of 0.1 kg/aJ, 0.2 kg/a#,
0.3kg/cd, 0.5kg/aJ and 0.8kg
/ad, and cut oxygen amount (Nn(
/min) and iron powder supply t (g/min) (hereinafter referred to as oxygen/
Data collected by experimenting over a long period of time to confirm the relationship between the maximum cutting speed (m/min) that can be cut in good and stable conditions by varying the iron powder ratio (sometimes referred to as the iron powder ratio). This is a diagram created based on.
この第１図から上記本発明で規定した酸素・鉄粉比及び
キャリヤガス圧の範囲の場合に最大切断速度が大きいす
なわち切断状態が良好なことが判り、また切断速度を上
げても吹上げもなかった。逆に酸素・鉄粉比及びキャリ
アガス圧が上記範囲よりも大き過ぎると過剰な鉄粉２や
キャリアガスの冷却効果により安定した切断に必要な充
分な予熱が得られず、また反対に小さ過ぎる場合は鉄粉
２の供給不足によりこれもまた熱不足となり、酸化反応
部６における安定且つ連続的な溶融状態が得ら
′れず、切断がスムーズに行えないのである。更に説明
すると、鉄粉２がキャリアガスと共に予熱フレーム４を
通過する間に鉄粉２が充分予熱されることが必要である
が、鉄粉２を多量に供給することは却って予熱を妨げて
いることになる。またキャリアガス圧が高いとキャリア
ガスの流速が速すぎるため予熱フレーム４を乱し、この
ようなことによっても効率良く鉄粉の予熱が行われない
ことになるのである０本発明方法で規定した切断酸素ｆ
ｉ（ＮｒｒＩ″／分）：鉄粉供給量（ｇ／分）及びキャ
リアガス圧に関する前記条件は、上記の如き酸化反応部
６の溶融を不充分とさせる要因をすべて排除したもので
ある。本発明方法において規定した条件以外のパウダー
カッティング条件（各ガスの圧力や流量等）は従来のパ
ウダーカッティングのそれで良く、その標準的なものは
実施例で示す。From FIG. 1, it can be seen that when the oxygen/iron powder ratio and carrier gas pressure are within the ranges specified in the present invention, the maximum cutting speed is high, that is, the cutting condition is good, and even if the cutting speed is increased, no blow-up occurs. There wasn't. On the other hand, if the oxygen/iron powder ratio and carrier gas pressure are too large than the above ranges, sufficient preheating necessary for stable cutting cannot be obtained due to the cooling effect of excess iron powder 2 and carrier gas, or on the contrary, it is too small. In this case, due to the insufficient supply of iron powder 2, there is also a lack of heat, and a stable and continuous molten state cannot be obtained in the oxidation reaction section 6.
This prevents smooth cutting. To explain further, the iron powder 2 needs to be sufficiently preheated while passing through the preheating frame 4 together with the carrier gas, but supplying a large amount of the iron powder 2 actually impedes preheating. It turns out. Furthermore, if the carrier gas pressure is high, the flow rate of the carrier gas is too fast, which disturbs the preheating frame 4, which also prevents the iron powder from being efficiently preheated. cutting oxygen f
i (NrrI''/min): The above conditions regarding the iron powder supply amount (g/min) and carrier gas pressure exclude all factors that would cause insufficient melting in the oxidation reaction section 6 as described above. The powder cutting conditions (pressure and flow rate of each gas, etc.) other than those specified in the method of the invention may be those of conventional powder cutting, and the standard conditions are shown in the examples.
厚さ２００ｍｍの５ＩＩ９３０４の連続鋳造スラブを第
２図に示す火口１（火口１の外径２９ｍ、切断酸素口１
ａの直径５ｍ＋、予熱用可燃性ガスロ１ｂの１つの孔の
直径２ ｍ 、予熱用可燃性ガス口１ｂの孔数１１．予
熱酸素口１ｃの幅１臘で外側径１９＋ｍ）を使用して本
発明方法によりパウダーカッティングを行った。A continuously cast slab of 5II9304 with a thickness of 200 mm was placed at the crater 1 shown in Figure 2 (the outer diameter of the crater 1 was 29 m, the cutting oxygen port 1 was
a diameter of 5 m+, the diameter of one hole of the preheating flammable gas outlet 1b is 2 m, and the number of holes of the preheating flammable gas outlet 1b is 11. Powder cutting was performed according to the method of the present invention using a preheated oxygen port 1c with a width of 1 l and an outer diameter of 19+ m.
予熱用可燃性ガスとしてはＬＰＧを、また鉄粉キャリア
ガスとしては窒素ガスをそれぞれ使用したパウダーカッ
ティングの各条件は表に示す、キャリアガス以外の各ガ
スの圧力は軟管入口でのものである。ここで、切断酸素
圧を９ ｋｇ／ａｄとしたのは、高圧酸素規制（１０ｋ
ｇ／ｃｄ以上）以下でなるべく高い圧力としたからであ
り、また予熱酸素圧及びＬＰＧ圧がそれぞれ３ ｋｇ／
ａ＃及び０．３ｋｇ／ａｊであるのは、予熱フレーム４
の先端１１５程がスラブ表面にかかった状態にしたとき
の圧力である。キャリアガス圧は、鉄粉を供給する場合
常時均一には送粉できず、どうしても多少変動するから
平均圧力で示しである。また、使用する鉄粉の粒径につ
いても種々検討した結果、従来より若干細粒の３０〜２
５０μｓのものを使用した。上記条件下に良好に切断で
きた最大切断速度及び切断溝幅を表に示す。The powder cutting conditions using LPG as the flammable gas for preheating and nitrogen gas as the iron powder carrier gas are shown in the table.The pressures of each gas other than the carrier gas are at the soft tube inlet. . Here, the cutting oxygen pressure was set to 9 kg/ad because of the high pressure oxygen regulation (10 kg/ad).
This is because the pressure was set as high as possible (at least 3 kg/cd) and the preheating oxygen pressure and LPG pressure were each 3 kg/cd.
a# and 0.3 kg/aj are preheating frame 4
This is the pressure when about 115 of the tip is applied to the slab surface. When supplying iron powder, the carrier gas pressure cannot be uniformly distributed all the time, and it inevitably fluctuates somewhat, so the average pressure is shown. In addition, as a result of various studies regarding the particle size of the iron powder used, we found that the particle size of the iron powder used was slightly finer than the conventional one.
A 50 μs one was used. The table shows the maximum cutting speed and width of the cutting groove that could be cut successfully under the above conditions.
鉄粉供給量及びキャリアガス圧（従って流量）を変えた
以外は上記と同様の条件の従来方法で行った比較例も表
に併記する。Comparative examples conducted using the conventional method under the same conditions as above except that the amount of iron powder supplied and the carrier gas pressure (therefore, the flow rate) were changed are also listed in the table.
表
表から本発明方法による場合は従来方法と比較して遥か
に速く（本例では１．４倍の速さで）良好に、且つ切断
溝幅も格段に狭く（本例では３５〜４０％狭く）ステン
レス鋼スラブを切断できることが判る。そして切断ノロ
の発生が少なかった。As can be seen from the table, the method of the present invention is much faster than the conventional method (1.4 times faster in this example), and the width of the cutting groove is also much narrower (35 to 40% in this example). It can be seen that it is possible to cut stainless steel slabs (narrowly). Also, there was less occurrence of cutting slag.
５ＵＳ４３０．５ＵＳ３１６等のスラブについても本発
明方法を実施し、同様な結果が得られている。The method of the present invention was also applied to slabs such as 5US430.5US316, and similar results were obtained.
以上詳述した本発明に係るステンレス鋼スラブのパウダ
ーカッティング方法は、切断酸素量と鉄粉供給量との比
及びキャリアガスの圧力を従来の定説とは異なる特定の
範囲に規定したことにより、以下に述べる効果を有する
。The stainless steel slab powder cutting method according to the present invention described in detail above is as follows by specifying the ratio of cutting oxygen amount to iron powder supply amount and the carrier gas pressure to a specific range different from the conventional theory. It has the effects described in .
（ａ）切断不能に至ること無く良好に切断できる最大切
断速度が従来の条件に比較し、大幅に向上した。(a) The maximum cutting speed that allows good cutting without becoming impossible to cut has been significantly improved compared to conventional conditions.
（ｂ）鉄粉使用量が約１７４に減少した。(b) The amount of iron powder used decreased to about 174.
（Ｃ）切断溝幅が格段に狭くなり、従って封材歩留が向
上した。(C) The width of the cutting groove was significantly narrowed, and the yield of sealing material was therefore improved.
（ｄ）切断ノロの発生が少なくなってロール面やスラブ
切断面へのノロ付着が減少し、従ってスラブ手入れ時間
が減少すると共にスラブ疵取時の歩留が向上した。(d) The generation of cutting slag is reduced, and the adhesion of slag to the roll surface and the cut surface of the slab is reduced, and therefore, the slab cleaning time is reduced and the yield when removing defects from the slab is improved.
第１図はキャリアガスの各種圧力における切断酸素量と
鉄粉供給量との比と切断速度との関係を示す図であり、
第２図はガス切断に用いる軟管の火口の１例の（イ）は
縦断面図で（ロ）は同図（イ）中Ａ−Ａ線断面図、第３
図はパウダーカッティング実施状態の説明図である。
図面中
１・・・・火口
ｌａ・・・・切断酸素口
１ｂ・・・・予熱用可燃性ガス口
１ｃ・・・・予熱酸素口
２・・・・鉄粉
３・・・・鉄粉供給管
４・・・・予熱フレーム
５・・・・切断酸素
６・・・・酸化反応部FIG. 1 is a diagram showing the relationship between the ratio of cutting oxygen amount to iron powder supply amount and cutting speed at various pressures of carrier gas,
Figure 2 shows an example of a soft pipe crater used for gas cutting.
The figure is an explanatory diagram of a state in which powder cutting is performed. In the drawing 1... Crater la... Cutting oxygen port 1b... Preheating flammable gas port 1c... Preheating oxygen port 2... Iron powder 3... Iron powder supply Pipe 4... Preheating frame 5... Cutting oxygen 6... Oxidation reaction section
Claims (1)
可燃性ガス流及び予熱酸素流とを火口より噴流させ後者
によつて生じる予熱フレームにより加熱された予熱域に
切断酸素が吹き付けられて形成されている酸化反応部に
上記予熱フレームを貫通してキャリアガスにより鉄粉を
噴射供給してステンレス鋼スラブをパウダーカッティン
グするに当り、切断酸素量（Ｎｍ＾３／分）と鉄粉供給
量（ｇ／分）との比を１：２５〜１：４０とし且つキャ
リアガスの圧力を０．２〜０．３ｋｇ／ｃｍ＾２とする
ことを特徴とするステンレス鋼スラブのパウダーカッテ
ィング方法。 ２ 鉄粉として粒径が３０〜２５０μｍのものを使用す
る請求項１に記載のステンレス鋼スラブのパウダーカッ
ティング方法。[Scope of Claims] 1. A cutting oxygen stream is directed toward the cutting location, and surrounding it, a preheating flammable gas stream and a preheating oxygen stream are jetted from a crater into a preheating area heated by a preheating flame generated by the latter. When powder cutting a stainless steel slab by injecting and supplying iron powder with a carrier gas through the preheating frame to the oxidation reaction zone formed by spraying cutting oxygen, the amount of cutting oxygen (Nm^3/min) is ) and iron powder supply rate (g/min) is 1:25 to 1:40, and the carrier gas pressure is 0.2 to 0.3 kg/cm^2. powder cutting method. 2. The method for powder cutting a stainless steel slab according to claim 1, wherein iron powder having a particle size of 30 to 250 μm is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14364988A JPH0661614B2 (en) | 1988-06-13 | 1988-06-13 | How to powder cut stainless steel slabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14364988A JPH0661614B2 (en) | 1988-06-13 | 1988-06-13 | How to powder cut stainless steel slabs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01313189A true JPH01313189A (en) | 1989-12-18 |
| JPH0661614B2 JPH0661614B2 (en) | 1994-08-17 |
Family
ID=15343695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14364988A Expired - Lifetime JPH0661614B2 (en) | 1988-06-13 | 1988-06-13 | How to powder cut stainless steel slabs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0661614B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118180475A (en) * | 2024-05-17 | 2024-06-14 | 四川汇达未来科技有限公司 | Equidistant cutting device for manufacturing teaching instrument and use method |
-
1988
- 1988-06-13 JP JP14364988A patent/JPH0661614B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118180475A (en) * | 2024-05-17 | 2024-06-14 | 四川汇达未来科技有限公司 | Equidistant cutting device for manufacturing teaching instrument and use method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0661614B2 (en) | 1994-08-17 |
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