JPH0387312A - Steel hardening using liquid cooling medium - Google Patents
Steel hardening using liquid cooling mediumInfo
- Publication number
- JPH0387312A JPH0387312A JP21593690A JP21593690A JPH0387312A JP H0387312 A JPH0387312 A JP H0387312A JP 21593690 A JP21593690 A JP 21593690A JP 21593690 A JP21593690 A JP 21593690A JP H0387312 A JPH0387312 A JP H0387312A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- cooling medium
- temperature
- cooling
- temp
- 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 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 239000002826 coolant Substances 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 title claims description 9
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 6
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 3
- 230000035882 stress Effects 0.000 claims abstract 2
- 230000008646 thermal stress Effects 0.000 claims abstract 2
- 238000010791 quenching Methods 0.000 claims description 11
- 230000000171 quenching effect Effects 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910001149 41xx steel Inorganic materials 0.000 description 1
- 238000005111 flow chemistry technique Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 230000029052 metamorphosis Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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 Articles (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、圧延プロセスに直接続いて焼き入れを行う、
液状冷却媒体による鋼の焼き入れ方法、特に比較的に大
きな直径を有する合金または非合金の熱処理鋼からなる
棒状圧延製品の焼き入れ方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides a rolling process which is directly followed by quenching.
The present invention relates to a method for hardening steel with a liquid cooling medium, and in particular to a method for hardening bar-shaped rolled products made of alloyed or non-alloyed heat-treated steel having a relatively large diameter.
***国特許第２４２６９２０号公報により、炭素含有量
が少ない鋼からなる溶接可能な棒鋼を製造する方法が知
られている。この方法では、圧延材が最後の圧延プロセ
スのすぐ後で、水で１回または数回冷却され、それに続
いて静止空気で冷却される。このように水と静止空気内
で棒状圧延材を１回または数回冷却することにより、微
小組織の改善、特に棒鋼の縁領域の焼き入れ組織の充分
な焼き戻しと、棒鋼中心部に大きな強度を有する微小組
織への変態が達成される。溶接可能な棒鋼を製造するた
めのこの公知の方法は、水と空気による多数回の連続冷
却プロセスに基づいて、比較的に多量のエネルギー、時
間およびコストを必要とするだけでなく、この方法では
小さな棒直径（例えば１０〜２０Ｍ）の鋼製捧の場合に
も、縁領域の硬化深さが浅い。更に、この方法は炭素含
有量の少ない溶接可能な棒鋼の製造に限定される。From German Patent No. 2 426 920 a method is known for producing weldable steel bars made of steel with a low carbon content. In this method, the rolled material is cooled once or several times with water immediately after the last rolling process, followed by cooling with still air. By cooling the bar-shaped rolled material once or several times in water and still air, the microstructure is improved, especially the hardened structure in the edge region of the bar is sufficiently tempered, and the center of the bar is given greater strength. Metamorphosis into a microtissue with . This known method for producing weldable steel bars is not only based on a large number of successive cooling processes with water and air, but also requires a relatively large amount of energy, time and cost. Even in the case of steel rods with small rod diameters (for example 10-20M), the hardening depth in the edge region is shallow. Furthermore, this method is limited to the production of weldable steel bars with low carbon content.
〔発明が解決しようとする課題］
本発明の課題は、任意の質と任意の寸法の鋼の硬化深さ
を大幅に増大させることができるだけでなく、比較的に
大きな直径の鋼製棒状圧延製品の完全焼き入れを簡単に
行うことができる、鋼の焼き入れ方法を提供することで
ある。[Problems to be Solved by the Invention] It is an object of the present invention to not only be able to significantly increase the hardening depth of steel of any quality and size, but also to significantly increase the hardening depth of steel bar-shaped products with a relatively large diameter. An object of the present invention is to provide a method for hardening steel, which can easily harden the steel completely.
この課題は、鋼製圧延製品が圧延プロセスの後直ぐに、
冷却媒体を備えた冷却区間に供給され、冷却区間で高い
流速にさらされることによって解決される。This problem is caused by the fact that steel rolled products are
This is solved by supplying a cooling section with a cooling medium and exposing it to high flow rates in the cooling section.
圧延製品が、例えば長いトラフまたは長い樋として形成
可能な冷却区間内で、高い流速にさらされることにより
、圧延製品の外面は数分の１秒で、常に新しい冷却媒体
に接触し、それによって熱放出、ひいては圧延製品の冷
却速度が大幅に加速される。従って、任意の質と任意の
寸法の鋼の硬化深さを大幅に増大させることができ、か
つ比較的に大きな直径の鋼製棒状圧延製品の完全焼き入
れを簡単に行うことができる。Due to the fact that the rolled product is exposed to high flow velocities in the cooling section, which can be formed, for example, as a long trough or a long trough, the outer surface of the rolled product is constantly in contact with fresh cooling medium within a fraction of a second and is thereby exposed to heat. The ejection and thus the cooling rate of the rolled product is significantly accelerated. Therefore, the hardening depth of steel of any quality and size can be significantly increased, and complete hardening of relatively large diameter steel bar rolled products can be easily achieved.
本発明の非常に有利な実施形では、冷却区間の流速が、
５００００Ｗ／ｍ”／Ｋ以上の熱伝達係数を生じるよう
な速さであり、圧延材横断面積の平均温度がＭＳ−温度
以下になるまで冷却区間内で冷却され、それによって冷
却区間を出た後で、横断面全体にわたる均熱により、中
心部内にあるオーステナイトが中間段階組織（ベイナイ
ト）に変態し、同時にマルテンサイトの縁領域において
、最高ＭＳ−温度までの温度の再上昇により、加えられ
た熱応力と変態応力の大部分が取り除かれる。これによ
り、割れの形成の危険が回避されるという重要な利点が
得られる。In a very advantageous embodiment of the invention, the flow rate in the cooling section is
The rolling material is cooled at such a rate that it produces a heat transfer coefficient of 50,000 W/m"/K or more, and is cooled in the cooling section until the average temperature of the cross-sectional area of the rolled material is below the MS- temperature, so that after leaving the cooling section , the austenite in the core is transformed into an intermediate-stage structure (bainite) by soaking over the entire cross-section, and at the same time in the edge region of the martensite the applied heat is increased by a re-increase in temperature up to the maximum MS-temperature. Most of the stresses and transformation stresses are removed, which has the important advantage that the risk of crack formation is avoided.
横断面全体の温度がＭＳ−温度以下になるまで、圧延製
品が冷却区間で冷却され、それによって中心部領域もマ
ルテンサイト化されると非常に合目的である。It is very expedient if the rolled product is cooled in a cooling zone until the temperature of the entire cross section is below the MS temperature, so that the central region is also martensitized.
本発明の他の実施形では、完全焼き入れされた圧延製品
が、付加的な熱処理で、それ以降の処理にとって必要な
温度に焼き戻しされる。In another embodiment of the invention, the fully hardened rolled product is tempered with an additional heat treatment to the temperature required for further processing.
鋼の焼き入れは本発明では次のようにして有利に行うこ
とができる。すなわち、冷却区間内にある冷却媒体を通
って高速で圧延製品を運ぶことによって行うことができ
るかまたは冷却区間内にある媒体に圧延製品を浸漬し、
圧延製品の全周を流れるように、冷却媒体を高速で冷却
区間を通って移動させることによって行うことができる
。両方により、本発明による鋼の同じ冷却作用と完全焼
き入れが達成可能である。ケースバイケースで、特に設
備や圧延機が存在する場合、どの焼き入れ方法が既存の
圧延機の材料流れや後処理設備に最も迅速にかつ簡単に
統合できるかということを決定するだけでよい。Hardening of steel can advantageously be carried out in the following manner according to the invention. That is, it can be carried out by conveying the rolled product at high speed through a cooling medium located in a cooling zone or by immersing the rolled product in a medium located in a cooling zone;
This can be done by moving the cooling medium at high speed through a cooling zone so that it flows around the entire circumference of the rolled product. With both, the same cooling effect and complete hardening of the steel according to the invention can be achieved. On a case-by-case basis, it is only necessary to decide which quenching method can be most quickly and easily integrated into the existing rolling mill material flow and post-processing equipment, especially if equipment and rolling mills are present.
本発明では、鋼の焼き入れのための冷却媒体および急冷
媒体として、効果のある水が使用される。In the present invention, effective water is used as a cooling and quenching medium for steel hardening.
勿論、水の代わりに冷却媒体および急冷媒体として、油
、アイスウォータ、塩溶液等のような他の液体を鋼の焼
き入れに使用することができる。しかし、特殊な場合や
、水が冷却媒体および急冷媒体として所望な結果をもた
らさない場合にのみ、鋼を焼き入れするための前記冷却
媒体および急冷媒体を使用することができる。Of course, instead of water, other liquids can be used as cooling and quenching media for hardening steel, such as oil, ice water, salt solutions, etc. However, it is possible to use said cooling and quenching medium for hardening steel only in special cases and when water does not give the desired results as a cooling and quenching medium.
本発明の他の詳細、特徴および効果は、グラフに基づい
て示した実施例の以下の説明から明らかになる。この場
合、直径７０閣の品質３４ ＣｒＭｏ ４の棒鋼が、本
発明による冷却処理または熱処理、すなわち圧延熱から
の焼きならしく調質）を受ける。Other details, features and advantages of the invention emerge from the following description of graphically illustrated exemplary embodiments. In this case, a steel bar of quality 34 CrMo 4 with a diameter of 70 mm is subjected to a cooling treatment or a heat treatment according to the invention, ie tempering from the rolling heat.
第１図は、１０５０″Ｃの圧延温度から出発した、棒鋼
の中心部（Ｋ）と表面（０）の冷却曲線と平均横断面温
度（Ｍ）をグラフで示している。この場合、圧延された
棒鋼は水冷区間（Ｗ）で３２秒の時間にわたって熱伝導
係数α＞５００００Ｗ／ｍ”／Ｋで処理され、その後空
気による均熱領域（Ａ）で約５０〜６０秒経過後、横断
面全体にわたって３８０ ’Ｃの同じ温度を有する。Figure 1 graphically shows the cooling curves and average cross-sectional temperature (M) of the center (K) and surface (0) of a steel bar starting from a rolling temperature of 1050''C. The steel bar was treated in the water cooling section (W) for a period of 32 seconds with a thermal conductivity coefficient α > 50000 W/m''/K, and then in the air soaking section (A) for about 50 to 60 seconds, the entire cross section was have the same temperature of 380'C throughout.
第２図は冷却時間の関数としての、棒構断面に対する温
度経過を示している。半径が２５胴と３０１１ＩＩＩｌ
の場合の垂直な交線は、処理された棒鋼の縁から１０ｍ
ｍと５ ｍｍ離れたところの温度経過または冷却曲線に
相当する（第３図の冷却曲線Ｒ１０とＲ３参照）。FIG. 2 shows the temperature profile for the rod section as a function of the cooling time. Radius is 25 cylinder and 3011IIIl
The vertical intersection line is 10 m from the edge of the treated steel bar.
m and corresponds to the temperature profile or cooling curve at a distance of 5 mm (see cooling curves R10 and R3 in FIG. 3).
第３図は、公知の連続的な時間−温度−変態グラフ（鋼
／ｌｌ−１０８Ｅを熱処理するためのグラフ集）である
。この場合、オーステナイト化温度は１０５０°Ｃであ
り、保持時間は１０分であり、２分内に加熱される。こ
のグラフには、縁領域（Ｒ）の冷却曲線、すなわち５ｍ
Ｉｎの縁（Ｒ７）と１０■の縁（ＲＩＧ）の冷却曲線と
、中心部領域（Ｋ）の冷却曲線が記入されている。その
際、オーステナイトの範囲は（ＡＴ）で表され、フェラ
イト形成の範囲は（ＦＴ）で表され、パーライト形成の
範囲は（ＰＴ）で表され、中間段階組織形成の範囲は（
ＺＷ）で表され、マルテンサイト形成の範囲は（ＭＴ）
で表されている。硬度ＨＲｃまたは）ＩＶが丸付き数字
で記入されている。グラフ中の残りの数字は公知のよう
に、対応する組織成分％である。FIG. 3 is a known continuous time-temperature-transformation graph (graph collection for heat treating steel/ll-108E). In this case, the austenitizing temperature is 1050°C, the holding time is 10 minutes, and heating is done within 2 minutes. This graph shows the cooling curve of the edge region (R), i.e. 5 m
The cooling curves of the edge of In (R7) and the edge of 10cm (RIG), and the cooling curve of the central region (K) are drawn. The extent of austenite formation is then represented by (AT), the extent of ferrite formation is represented by (FT), the extent of pearlite formation is represented by (PT), and the extent of intermediate stage structure formation is represented by (
ZW), and the range of martensite formation is (MT)
It is expressed as. Hardness HRc or) IV is written in a circled number. The remaining numbers in the graph are the corresponding percent tissue components, as is known.
３８０°Ｃの焼き戻し温度（第１図参照）のときに棒鋼
の表面範囲には、４４１１Ｒｃの硬度が生じる。At a tempering temperature of 380° C. (see FIG. 1), a hardness of 4411 Rc occurs in the surface area of the steel bar.
第４図は、４０ＨＲｃの硬度を有する中心部領域（Ｋ）
の変態を恒温のＺＴＵ−グラフで示している（オーステ
ナイト化温度１０５０”Ｃ１保持時間５分、１分で加熱
される）。硬さは棒構断面にわたって、中心部の４０Ｈ
Ｒｃと表面の４４１１Ｒｃの間にある。Figure 4 shows the central region (K) with a hardness of 40 HRc.
The transformation is shown in an isothermal ZTU-graph (austenitization temperature 1050" C1 holding time 5 minutes, heating for 1 minute).
It is between Rc and 4411Rc on the surface.
これにより、横断面にわたって強度の均一化が遠戚され
る。この均一化は従来の熱処理では達成不可能である。This makes the strength more uniform across the cross section. This uniformity cannot be achieved with conventional heat treatments.
本発明による手段は、グラフに示した実施例に限定され
ない。例えば、本発明の範囲を逸脱せずに、任意の合金
および非合金の熱処理鋼を本発明に従って処理すること
ができる。特に、冷却処理の方法と冷却区間の構造的な
形成は、個々の使用４゜
範囲に応じて、当業者に委ねられる。更に、本発明では
、任意の形状の圧延製品または予備成形された焼き入れ
可能な任意の他の鋼製製品に、特別な冷却処理と熱処理
を行うことができる。いかなる場合でも、本発明による
手段により、従来得られなかった大きな硬化深さが遠戚
されるかあるいは鋼製品の中心部まで完全焼き入れが行
われ、公知の方法と比べて、エネルギーとコストが大幅
に低減される。The measures according to the invention are not limited to the examples shown in the graph. For example, any alloyed and non-alloyed heat treated steel can be treated according to the invention without departing from the scope of the invention. In particular, the method of cooling treatment and the structural design of the cooling section are left to the person skilled in the art, depending on the particular 4° range used. Furthermore, the present invention allows rolling products of any shape or any other preformed hardenable steel products to be subjected to special cooling and heat treatments. In any case, by means of the measures according to the invention, large hardening depths hitherto unobtainable can be achieved, or even complete hardening can be achieved right down to the core of the steel product, while saving energy and costs compared to known methods. significantly reduced.
第１図は、棒鋼の中心部と表面の冷却曲線と平均横断面
温度を示すグラフ、第２図は冷却時間の関数としての、
棒構断面に対する温度経過を示すグラフ、第３図は、公
知の連続的な時間−温度変態グラフ、第４図は、４０Ｈ
Ｒｃの硬度を有する中心部領域の変態を示す恒温のＺＴ
Ｕ−グラフである。Figure 1 is a graph showing the cooling curve and average cross-sectional temperature of the center and surface of a steel bar, Figure 2 is a graph showing the cooling curve and average cross-sectional temperature as a function of cooling time.
A graph showing the temperature progression with respect to the cross section of the rod structure, FIG. 3 is a known continuous time-temperature transformation graph, and FIG. 4 is a 40H
Isothermal ZT showing transformation of the central region with hardness of Rc
It is a U-graph.
Claims (1)
に大きな直径を有する合金または非合金の熱処理鋼から
なる棒状圧延製品の焼き入れ方法であって、しかも圧延
プロセスに直接続いて焼き入れする方法において、 鋼製圧延製品が圧延プロセスの後直ぐに、冷却媒体を備
えた冷却区間に供給され、冷却区間で高い流速にさらさ
れることを特徴とする液状冷却媒体による鋼の焼き入れ
方法。 ２、冷却区間の流速が、５００００Ｗ／ｍ＾２／Ｋ以上
の熱伝達係数を生じるような速さであり、圧延材横断面
積の平均温度がＭＳ−温度以下になるまで冷却区間内で
冷却され、それによって冷却区間を出た後で、横断面全
体にわたる均熱により、中心部内にあるオーステナイト
が中間段階組織（ベイナイト）に変態し、同時にマルテ
ンサイトの縁領域において、最高ＭＳ−温度までの温度
の再上昇により、加えられた熱応力と変態応力の大部分
が取り除かれることを特徴とする、請求項１記載の液状
冷却媒体による鋼の焼き入れ方法。 ３、横断面全体の温度がＭＳ−温度以下になるまで、圧
延製品が冷却区間で冷却され、それによって中心部領域
もマルテンサイト化されることを特徴とする、請求項１
または請求項２記載の液状冷却媒体による鋼の焼き入れ
方法。 ４、完全焼き入れされた圧延製品が、付加的な熱処理で
、それ以降の処理にとって必要な温度に焼き戻しされる
ことを特徴とする、請求項１から請求項３までのいずれ
か一つに記載の液状冷却媒体による鋼の焼き入れ方法。 ５、冷却媒体として水が使用されることを特徴とする、
請求項１から請求項４までのいずれか一つに記載の液状
冷却媒体による鋼の焼き入れ方法。 ６、直径が７０ｍｍまでの棒状熱処理鋼が処理されるこ
とを特徴とする、請求項１から請求項５までのいずれか
一つに記載の液状冷却媒体による鋼の焼き入れ方法。[Scope of Claims] 1. A method for quenching steel using a liquid cooling medium, in particular a method for quenching bar-shaped rolled products made of alloyed or non-alloyed heat-treated steel having a relatively large diameter, and which is suitable for the rolling process. In the method of direct subsequent quenching, the steel rolled product is fed immediately after the rolling process to a cooling zone with a cooling medium, and is exposed to a high flow rate in the cooling zone. Quenching method. 2. The flow velocity in the cooling section is such that a heat transfer coefficient of 50000 W/m^2/K or more is generated, and the rolling material is cooled in the cooling section until the average temperature of the cross-sectional area of the rolled material becomes below the MS- temperature. , so that after leaving the cooling zone, the austenite in the core is transformed into an intermediate stage structure (bainite) by soaking over the entire cross-section, and at the same time in the edge region of the martensite, the temperature increases up to the maximum MS-temperature. 2. The method of quenching steel using a liquid cooling medium according to claim 1, wherein most of the applied thermal stress and transformation stress are removed by re-raising the temperature. 3. The rolled product is cooled in a cooling section until the temperature of the entire cross section is below the MS-temperature, whereby the central region is also martensited, as claimed in claim 1.
Or a method of hardening steel using a liquid cooling medium according to claim 2. 4. According to any one of claims 1 to 3, characterized in that the fully hardened rolled product is tempered in an additional heat treatment to the temperature required for further processing. A method of hardening steel using a liquid cooling medium as described. 5.Characterized in that water is used as a cooling medium,
A method of hardening steel using a liquid cooling medium according to any one of claims 1 to 4. 6. A method for hardening steel with a liquid cooling medium according to any one of claims 1 to 5, characterized in that a rod-shaped heat-treated steel having a diameter of up to 70 mm is treated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3927276.1 | 1989-08-18 | ||
| DE19893927276 DE3927276A1 (en) | 1989-08-18 | 1989-08-18 | METHOD FOR HARDENING STEEL WITH THE AID OF LIQUID COOLING MEDIA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0387312A true JPH0387312A (en) | 1991-04-12 |
Family
ID=6387361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21593690A Pending JPH0387312A (en) | 1989-08-18 | 1990-08-17 | Steel hardening using liquid cooling medium |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0418506A1 (en) |
| JP (1) | JPH0387312A (en) |
| DE (1) | DE3927276A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19612818C2 (en) * | 1996-03-30 | 1998-04-09 | Schloemann Siemag Ag | Process for cooling warm-rolled steel profiles |
| DE19718530B4 (en) * | 1997-05-02 | 2005-02-03 | Sms Demag Ag | Process for cooling of rolling-cold rolling stock and apparatus for carrying out the method and use of the apparatus |
| DE19850739A1 (en) * | 1998-11-04 | 2000-05-11 | Schloemann Siemag Ag | Method and device for cooling hot rolled material, in particular hot wide strip |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE907532C (en) * | 1944-04-04 | 1954-03-25 | Deutsche Edelstahlwerke Ag | Intermediate quenching of unalloyed and alloyed steels |
| DE904294C (en) * | 1951-03-25 | 1954-02-18 | Wilhelm Stich Dipl Ing Dr | Method and device for rolling hardening directly from the finished pass, namely with a higher rolling speed and rolling core or steel pipe length |
| NL170159C (en) * | 1973-06-04 | 1982-10-01 | Estel Hoogovens Bv | METHOD FOR MANUFACTURING WELDABLE LOW CARBON STEEL MATERIAL BY CONTROLLED COOLING |
| DD119270B1 (en) * | 1975-04-02 | 1987-10-14 | Florin Stahl Walzwerk | PROCESS FOR PRODUCING ROLLED STEEL PRODUCTS WITH DEFINED EDGE ZONE AND HIGH-FIXED CORE |
| GB2088900A (en) * | 1980-12-02 | 1982-06-16 | British Steel Corp | Production of nickel steel bar and rod |
| FR2522688B1 (en) * | 1982-03-03 | 1990-09-14 | Siderurgie Fse Inst Rech | PROCESS AND INSTALLATION FOR HEAT TREATMENT OF ALLOYED STEEL BARS READY FOR USE, PARTICULARLY FOR MECHANICAL CONSTRUCTION |
| DD253581B3 (en) * | 1986-11-14 | 1992-11-19 | Thaelmann Schwermaschbau Veb | DEVICE FOR COOLING ROLLING IN WATER COOLING TRACKS |
-
1989
- 1989-08-18 DE DE19893927276 patent/DE3927276A1/en not_active Withdrawn
-
1990
- 1990-07-25 EP EP90114203A patent/EP0418506A1/en not_active Ceased
- 1990-08-17 JP JP21593690A patent/JPH0387312A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0418506A1 (en) | 1991-03-27 |
| DE3927276A1 (en) | 1991-02-21 |
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