JPS5811713A - Sampling method of molten steel in converter - Google Patents
Sampling method of molten steel in converterInfo
- Publication number
- JPS5811713A JPS5811713A JP56110335A JP11033581A JPS5811713A JP S5811713 A JPS5811713 A JP S5811713A JP 56110335 A JP56110335 A JP 56110335A JP 11033581 A JP11033581 A JP 11033581A JP S5811713 A JPS5811713 A JP S5811713A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- lance
- sensor
- speed
- sampling
- 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 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 4
- 238000007670 refining Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 230000035515 penetration Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/12—Dippers; Dredgers
- G01N1/125—Dippers; Dredgers adapted for sampling molten metals
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
Description
【発明の詳細な説明】
ンプリングするための特にセンサーランスの挿入方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of inserting a sensor lance, in particular for sampling.
精錬中の転炉炉内からサブランス等のセンサーランスを
用いて溶鋼の測温や、溶鋼試料を安定して採取すること
は製鋼時間の短縮や終点制御精度の向上に不可欠な条件
となる。Measuring the temperature of molten steel and stably collecting molten steel samples from inside the converter furnace during refining using a sensor lance such as a sublance are essential conditions for shortening steelmaking time and improving endpoint control accuracy.
従来、このためにサブランス等のセンサーヲ転炉内に挿
入してからの操作速度は次の如く行なっている。Conventionally, for this purpose, the operation speed after inserting a sensor such as a sub-lance into the converter is as follows.
即ち 図の■に示すように転炉向上方位置Ａから湯面
到達直前の湯面直上近接位置Ｂに至るまでは、ｉｏｏ
− ２ｏｏ ｍ／９ｊ−で降下し、この湯面直上近接位
置Ｂから鋼浴内のサンプリング用停止位置ＣまでをｊＯ
− ＆Ｏ ｍ１５＋の速度で鋼浴内に浸漬させている
。そしてこのＣ点位置で静止してサンプリングを行ない
、再び上方に引き上げるが、このときのＯ−＋Ｄへの速
度は前述のＡ−）Ｂへの降下速度と同程度で操作される
。That is, as shown in ■ in the figure, from the upper position A of the converter to the position B just above the hot water level, the ioo
- Descend at a speed of 2oo m/9j-, and move from the close position B just above the hot water surface to the sampling stop position C in the steel bath.
- immersed in a steel bath at a speed of &O m15+. Then, it stops at this point C position and performs sampling, and is pulled upward again. At this time, the speed toward O-+D is operated at the same rate as the speed of descent toward A-)B described above.
さて従来での問題はＢ−４０間即ちセンサーランスが鋼
浴内に侵入する際センサーの折損事故が起り易い。それ
は測定時の溶湯表面，或はスラグ中のＰｅＯ量によって
スラグの粘性が高く硬いからである。特に鋼中の炭素量
が０．３０ − ０．１０％の如く高い場合に問題が大
きく、センサー折損率が増加する。Now, the problem with the conventional method is that when the sensor lance enters the steel bath, breakage of the sensor is likely to occur. This is because the slag has a high viscosity and is hard depending on the amount of PeO on the molten metal surface or in the slag at the time of measurement. This problem is especially serious when the carbon content in the steel is as high as 0.30-0.10%, and the sensor breakage rate increases.
また速い速度で侵入させると、サンプル容器内でのサン
プル量に大小のバラツキが生じ、サンプル不良率が高ま
る。Furthermore, if the sample is introduced at a high speed, the amount of sample in the sample container will vary in size, increasing the sample failure rate.
本発明は、これらの問題を解決するために、センサーラ
／スの鋼浴内侵入速度の最適条件について研究を行ない
実用的に最も有効な速度範囲を見出したものである。そ
の要旨は、センサーランスの降下速度特にＢ→Ｃ点の鋼
浴内侵入速度をｌθ〜４’７７ｍ／分の遅い速度に限定
したことにある。In order to solve these problems, the present invention has been made by researching the optimal conditions for the penetration speed of the sensor lath into the steel bath and finding the most practically effective speed range. The gist of this is that the rate of descent of the sensor lance, particularly the rate of entry into the steel bath from point B to C, is limited to a slow rate of lθ~4'77 m/min.
折損事故率を極小におさえるためには、本発明者らの実
験によれば、ｌ１Ｏｖｔ／’Ｊまでは許されることがわ
かった。したがってこれより遅い場合は、衝撃による折
損は回避できるが、しかし余り遅くなるとスラグ層内の
通過時間が増え、スラグが流入してピンホール発生の原
因となるので１０７７Ｌ／％が限度である。In order to keep the breakage accident rate to a minimum, the inventors' experiments have shown that up to 11 Ovt/'J is permissible. Therefore, if it is slower than this, breakage due to impact can be avoided, but if it is too slow, the time taken to pass through the slag layer increases and the slag flows in, causing pinholes, so 1077 L/% is the limit.
従来何気なく浸漬していた侵入速度を正確に適正な速度
で操作したことによって下表に示す如き効果を得た。The effects shown in the table below were obtained by accurately controlling the penetration speed, which had conventionally been used casually, to an appropriate speed.
図はセンサーランスの操作速度を示すグラフである。 特許出願人 新日本製鐵株式会社 The figure is a graph showing the operating speed of the sensor lance. Patent applicant: Nippon Steel Corporation
Claims (1)
のサンプルを採取するサンプリング方法において、セン
サーランスの降下速度を湯面直上の近禰位置から鋼浴内
のサンプリング用停止位置までを／θ〜４Ｌ０ｍ１５）
とすることを特徴とする転炉炉内溶鋼のサンプリング方
法。In a sampling method in which a sensor lance is immersed in the molten steel in the converter furnace during refining to collect samples from the steel bath, the rate of descent of the sensor lance from the Kinne position just above the hot water level to the sampling stop position in the steel bath is measured. /θ~4L0m15)
A method for sampling molten steel in a converter furnace, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56110335A JPS5811713A (en) | 1981-07-15 | 1981-07-15 | Sampling method of molten steel in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56110335A JPS5811713A (en) | 1981-07-15 | 1981-07-15 | Sampling method of molten steel in converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5811713A true JPS5811713A (en) | 1983-01-22 |
Family
ID=14533135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56110335A Pending JPS5811713A (en) | 1981-07-15 | 1981-07-15 | Sampling method of molten steel in converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5811713A (en) |
-
1981
- 1981-07-15 JP JP56110335A patent/JPS5811713A/en active Pending
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