JPH075991B2 - Heat treatment method for steel wire - Google Patents
Heat treatment method for steel wireInfo
- Publication number
- JPH075991B2 JPH075991B2 JP63081874A JP8187488A JPH075991B2 JP H075991 B2 JPH075991 B2 JP H075991B2 JP 63081874 A JP63081874 A JP 63081874A JP 8187488 A JP8187488 A JP 8187488A JP H075991 B2 JPH075991 B2 JP H075991B2
- Authority
- JP
- Japan
- Prior art keywords
- steel wire
- wire rod
- heat treatment
- temperature
- cooling
- 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 - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 23
- 239000010959 steel Substances 0.000 title claims description 23
- 238000010438 heat treatment Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 16
- 239000003595 mist Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 14
- 239000003507 refrigerant Substances 0.000 claims description 7
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000005491 wire drawing Methods 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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 Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鋼線材の熱処理に際し、高温の線材を所定の
冷却速度で冷却する熱処理、とくに温水を用いる熱処理
方法の改良に関するものである。Description: TECHNICAL FIELD The present invention relates to an improvement in a heat treatment for cooling a high-temperature wire rod at a predetermined cooling rate, particularly, a heat treatment method using hot water in heat treatment of a steel wire rod.
［従来技術］ 核沸騰を誘発せず、膜沸騰のみで、必要かつ充分な冷却
速度を得て鉛パテンチングによるものと同等で、ばらつ
きが少なく、均質で、かつ伸線加工性良好な中．高炭素
鋼線材を製造し得る処理方法が特願昭59-105558号（特
開昭60-248824号公報）に提案されている。[Prior Art] It is equivalent to the one obtained by lead patenting by obtaining a necessary and sufficient cooling rate by only film boiling without inducing nucleate boiling, and there is little variation, homogeneity, and good wire drawing workability. A treatment method capable of producing a high carbon steel wire rod is proposed in Japanese Patent Application No. 59-105558 (Japanese Patent Laid-Open No. 60-248824).
この方法は、熱間圧延され、金属組織がオーステナイト
組織を呈する高温にある中、高炭素鋼の非同心リング状
線材を、展開した形で略水平方向に移送しながら調整冷
却して直接熱処理する方法であって、強力な攪乱状態で
あり、かつ酸化性気泡の多数が均一に分散した95℃以下
の所定の温度に保持された気水混相流体からなる冷媒を
収容した槽中で、前記鋼線材を浸漬通過せしめ、かつ冷
媒を所定の方向、速度で流動させて線材に対し、全長に
亘り均一な冷却条件を与えて熱処理を行う、いわゆる調
整冷却による方法である。This method is hot-rolled, and at a high temperature where the metal structure exhibits an austenite structure, the non-concentric ring-shaped wire rod of high carbon steel is adjusted, cooled while being transferred in a substantially horizontal direction in the expanded form, and directly heat-treated. In a tank containing a refrigerant composed of a gas-water mixed phase fluid, which is in a strong disturbing state and is maintained at a predetermined temperature of 95 ° C or less in which a large number of oxidizing bubbles are uniformly dispersed, This is a so-called regulated cooling method in which the wire rod is immersed and passed, and a refrigerant is caused to flow at a predetermined direction and speed so as to be subjected to heat treatment under uniform cooling conditions over the entire length of the wire rod.
また、特開昭61-96040号公報に示されたように、ループ
レイヤーによって、鋼線材がコンベア上に捲落させ、搬
出の段階まで、できる限り線材が均一な熱処理条件を受
けるように、線材の移送に多段カスケード配置したチェ
インコンベアを用い、非同心リング状線材のエッジ部分
における線材の重なりをほぐして、冷媒の流動をよく
し、また、チェインコンベアのチェイン条幅員とこれと
前後のカスケード配置されたチェインコンベアのチェイ
ン条幅員とに差をもたせ、チェインと線材との接触位置
を短時間ごとに変更し、コールスポットの発生を防止で
きる構成を採ることが示されている。Further, as disclosed in JP-A-61-96040, the loop layer causes the steel wire rod to be wound onto the conveyor so that the wire rod is subjected to uniform heat treatment conditions as far as possible until the carrying-out stage. Using a chain conveyor with a multi-stage cascade arrangement for transporting the non-concentric ring-shaped wire material, the overlapping of the wire materials is loosened to improve the refrigerant flow, and the chain width of the chain conveyor and the cascade arrangement before and after this It is shown that the chain width of the chain conveyor is made different from that of the chain conveyor and the contact position between the chain and the wire is changed every short time to prevent the occurrence of call spots.
［発明が解決しようとする課題］ 上述のように線材に熱処理を施すために、ループレイヤ
ーで線材は水平コンベア上に捲落され、傾斜チェインコ
ンベアを経て、熱処理槽に浸漬され、冷却されるが、こ
のとき、非同心リング状線材が順次移送されるため、線
材が槽内浸漬時点で、リングエッジ部が高温、センター
部低温と温度差を生じている。このため得られる線材の
酸化スケールが不均一となる。[Problems to be Solved by the Invention] In order to heat treat a wire as described above, the wire is wound on a horizontal conveyor in a loop layer, passed through an inclined chain conveyor, immersed in a heat treatment tank, and cooled. At this time, since the non-concentric ring-shaped wire is sequentially transferred, when the wire is immersed in the tank, a temperature difference occurs between the ring edge part having a high temperature and the center part having a low temperature. For this reason, the oxide scale of the obtained wire becomes non-uniform.
前記従来技術に開示しているように、熱処理槽に浸漬し
てから後の線材の均等処理の進行が重要であることはい
うまでもないが、中．高炭素鋼線材がオーステナイトの
状態にあり、熱処理槽に浸漬される以前で、上述のよう
に、非同心リング状に展開されて移送される間に、リン
グエッジ部とセンター部に温度差があれば、線材表面に
できる酸化スケールが不均一となることも大きな問題で
ある。As disclosed in the above-mentioned prior art, it goes without saying that it is important to proceed with the uniform treatment of the wire rod after being immersed in the heat treatment tank. Before the high carbon steel wire rod is in the austenite state and is immersed in the heat treatment tank, as described above, there is a temperature difference between the ring edge portion and the center portion while being transferred in the non-concentric ring shape. For example, non-uniform oxide scale formed on the surface of the wire is also a big problem.
［課題を解決するための手段］ 本発明は、前記課題を解決するため、非同心リング状で
移送される線材が、熱処理槽に浸漬される以前におい
て、浸漬直前の鋼線材温度を720℃〜900℃の範囲で、且
つ、リング状コイルのエッジ部分をセンター部分よりも
低温であるように冷却して、熱処理槽に浸漬して熱処理
を行なうもので、前記温度制御を行なうために、鋼線材
にミスト、又はスプレイ水を施して冷却をはかるもので
ある。[Means for Solving the Problems] In order to solve the above problems, the present invention provides a steel wire rod temperature immediately before immersion of 720 ° C. or less before a wire rod transferred in a non-concentric ring shape is immersed in a heat treatment tank. Cooling the edge part of the ring-shaped coil at a temperature lower than that of the center part in the range of 900 ° C, and immersing it in a heat treatment tank to perform heat treatment. To control the temperature, steel wire rod is used. A mist or spray water is applied to cool the water.
以下第１図に示す実施例により本発明を説明する。The present invention will be described below with reference to the embodiment shown in FIG.
図において１はループレイヤー、３は水平ローラコンベ
ア、４は傾斜チェインコンベア、８は水平チェインコン
ベア、９は傾斜チェインコンベア４と対向して設置され
たミスト、又はスプレイ水発生装置である。In the figure, 1 is a loop layer, 3 is a horizontal roller conveyor, 4 is an inclined chain conveyor, 8 is a horizontal chain conveyor, and 9 is a mist installed facing the inclined chain conveyor 4 or a spray water generator.
鋼線材２はループレイヤー１で非同心リング状で、展開
して水平ローラーコンベア３上に捲落され、傾斜チェイ
ンコンベア４上に移送され、ここで、ミスト又はスプレ
イ水５による処理を受け、連続的に温水中又は気相混相
冷媒中に浸漬される。鋼線材は捲落された後、温水槽６
内の冷却の安定膜沸騰を実現させるため、３〜15secの
範囲内で空気酸化させる必要がある。したがってミスト
スプレイあるいはスプレイ冷却は上記捲落し後、３〜20
sec間空気酸化させた後実施する必要がある。この空気
酸化時間内で線材２は放射、対流により冷却されるが、
このときセンター部がエッジ部よりも強く冷却され、セ
ンター、エッジ間での温度差が助長される。The steel wire rod 2 has a non-concentric ring shape in the loop layer 1, is unfolded and rolled down onto the horizontal roller conveyor 3, and is transferred onto the inclined chain conveyor 4, where it is treated with mist or spray water 5 and continuously. It is immersed in warm water or a mixed refrigerant of vapor phase. After the steel wire has been rolled down, the hot water tank 6
In order to realize stable film boiling for cooling inside, it is necessary to perform air oxidation within the range of 3 to 15 seconds. Therefore, mist spray or spray cooling should be 3 to 20 after the above winding.
It is necessary to carry out after air oxidation for sec. The wire 2 is cooled by radiation and convection within this air oxidation time.
At this time, the center portion is cooled more strongly than the edge portion, and the temperature difference between the center and the edge is promoted.
第２図はミスト、又はスプレイ水発生装置９のミスト、
又はスプレイ水発生単位Ｃの配置を示す。FIG. 2 shows a mist, or a mist of the spray water generator 9,
Alternatively, the arrangement of the spray water generation unit C is shown.
矢印は、鋼線材２の進行方向を示す。前記発生単位Ｃ
は、図示のようにコンベアの進行方向の中心線対称に、
上流より下流に、非同心リング状の展開した形で移動す
る鋼線材２のリングエッジ部分、次はリングエッジ部分
とその内側部分、更にその次は、リングエッジ部分とそ
の内側部分と更に内側部分に対向して段階的に配置され
る。そして非同心リング状で移動する鋼線材２の線材交
又密度が小さいセンター部分では冷却能の影響が及ばな
いが、極めて小さい配置とする。The arrow indicates the traveling direction of the steel wire rod 2. The generating unit C
Is symmetrical with respect to the center line of the traveling direction of the conveyor, as shown in the figure.
The ring edge portion of the steel wire rod 2 that moves in a non-concentric ring-like expanded form from upstream to downstream, next to the ring edge portion and its inner portion, and then to the ring edge portion, its inner portion and further inner portion. Are arranged in stages facing each other. The cooling capacity is not affected in the center portion of the steel wire rod 2 that moves in a non-concentric ring shape and the density of the wire rods is small, but the arrangement is extremely small.
鋼線材２はこの段階でパーライト変態させないように、
720℃以上、900℃以下の温度に設定されており、ミス
ト、又はスプレイ水で冷却を調整して、非同心リング状
に展開された状態で、鋼線材２が幅方向でエッジ部をセ
ンター部分よりも低温であるように冷却した状態で温水
槽６の気泡を含む温水７に順次浸漬し、冷却し、パーラ
イト変態させる。Steel wire rod 2 should not undergo pearlite transformation at this stage.
The temperature is set to 720 ° C or more and 900 ° C or less, the cooling is adjusted with mist or spray water, and the steel wire rod 2 is developed in a non-concentric ring shape. In a state of being cooled so that the temperature is lower than that, it is successively immersed in warm water 7 containing bubbles in the warm water tank 6, cooled, and transformed into pearlite.
温度分布として、温水あるいは気水混相冷媒中での冷却
においても、エッジ部よりセンター部分の冷却が強くな
ることを考慮して、浸漬直前において鋼線材のエッジ部
分をセンター部よりも低温とするようにスプレイやミス
トスプレイで冷却することが望ましい。温水槽の温度は
70℃以上としている。As for the temperature distribution, even when cooling in hot water or a mixed phase of water and water, in consideration of the fact that the cooling of the center portion becomes stronger than the edge portion, the edge portion of the steel wire rod should be cooled to a temperature lower than the center portion immediately before immersion. It is desirable to cool with a spray or mist spray. The temperature of the hot water tank is
70 ℃ or above.
この結果、高温酸化スケールのスケール厚さの均一化、
光沢、色彩の均質化等がなしとげられ、また温水中連続
移送時のパーライト変態も均質化し、この結果、抗張力
の均質な鋼線材が得られる。As a result, uniformization of scale thickness of high temperature oxide scale,
Gloss, color homogenization, etc. are achieved, and pearlite transformation during continuous transfer in warm water is also homogenized, and as a result, a steel wire material having a uniform tensile strength can be obtained.
［実施例］ 0.81％C,0.23％Si,0.49％Mn,0.011％P,0.013％Ｓの高炭
素鋼を110×110mm角ビレットから線材圧延し、仕上圧延
温度930〜960℃に圧延し、ループレイヤーで捲落し、水
平ローラーコンベアで移送、引続き傾斜チェインコンベ
アで移送し、空気酸化時間を13〜15secとして、この位
置でチェインコンベア上部からミストにより冷却した。
ミストは、第２図に示すようにミスト発生単位12区画に
よる配置とし、各単位において水圧2kg/cm2、空気圧1.3
kg/cm2として実施した。リング展開時のミスト冷却時間
はエッジ部分で約４〜5sec間である。[Example] High carbon steel of 0.81% C, 0.23% Si, 0.49% Mn, 0.011% P, 0.013% S was rolled from a 110 x 110 mm square billet to a finish rolling temperature of 930 to 960 ° C and rolled. It was rolled down by a player, transferred by a horizontal roller conveyor, and then transferred by an inclined chain conveyor, and the air oxidation time was set to 13 to 15 seconds, and at this position, it was cooled by a mist from the upper part of the chain conveyor.
As shown in Fig. 2, the mists are arranged in 12 mist-generating units, with water pressure of 2 kg / cm 2 and air pressure of 1.3 for each unit.
It was carried out as kg / cm 2 . The mist cooling time when the ring is expanded is about 4 to 5 seconds at the edge.
このミスト発生装置下を通過したコイルリングの最低温
度、最高温度の幅は30℃以内であり、平均値は825℃で
あった。The width of the lowest temperature and the highest temperature of the coil ring that passed under the mist generator was within 30 ° C, and the average value was 825 ° C.
熱処理槽における冷媒の設定条件は、微細な空気泡を含
む93℃の温水とした。また鋼線材は段差のあるチェイン
コンベア上を移送させながら冷却変態させた。The setting condition of the refrigerant in the heat treatment tank was 93 ° C. hot water containing fine air bubbles. Further, the steel wire rod was cooled and transformed while being transported on a chain conveyor having steps.
得られた鋼線材の抗張力と表面酸化スケールを観察し
た。The tensile strength and surface oxide scale of the obtained steel wire rod were observed.
一方、比較例としては、上記処理中の中で、傾斜チェイ
ンコンベア上のミスト冷却を停止した状態で処理し、そ
の他の条件を同一とした熱処理方法によった。On the other hand, as a comparative example, a heat treatment method in which the mist cooling on the inclined chain conveyor was stopped during the above treatment and the other conditions were the same was used.
第１表に引張試験結果及び表面スケールの外観観察とス
ケール厚さ（エッジ部のスケール厚とセンター部のスケ
ール厚さの差）の差を示す。Table 1 shows the results of the tensile test, the appearance of the surface scale and the difference in scale thickness (difference between the scale thickness at the edge portion and the scale thickness at the center portion).
なお、第１表でＡは比較例として示した従来の方法によ
るもの、Ｂは本発明の方法によるものである。In Table 1, A is the conventional method shown as a comparative example, and B is the method of the present invention.
抗張力の標準偏差が本発明の場合小さく、改善されてい
る。また、従来の方法では、赤スケールがエッジ部で認
められるが、本発明の方法では黒色均質スケールとなっ
ている。またエッジ部とセンター部ではスケール厚さの
差が小さくなっており、均質化されたことが分る。The standard deviation of tensile strength is small and improved in the present invention. Further, in the conventional method, a red scale is recognized at the edge portion, but in the method of the present invention, a black uniform scale is obtained. Further, the difference in scale thickness between the edge portion and the center portion is small, which shows that the scales are homogenized.
本発明は高炭素鋼線材のほか中炭素鋼線材の熱処理に適
用できる。 INDUSTRIAL APPLICABILITY The present invention can be applied to heat treatment of medium carbon steel wire as well as high carbon steel wire.
［発明の効果］ 以上説明したように、本発明の方法によれば、表面酸化
スケールの均質化と抗張力の変動幅の減少ができ、均質
な鋼線材が得られる。[Advantages of the Invention] As described above, according to the method of the present invention, the surface oxide scale can be homogenized and the fluctuation range of the tensile strength can be reduced, and a homogeneous steel wire can be obtained.
第１図は、本発明を実施する装置の一例を示す。 第２図は、ミスト、又はスプレイ水発生装置の配置の一
例を示す。 １…ループレイヤー、２…鋼線材、３…水平ローラーコ
ンベア、４…傾斜チェインコンベア、５…ミスト、又は
スプレイ水、６…温水槽、７…気泡を含む温水、８…水
平チェインコンベア、９…ミスト、又はスプレイ水発生
装置。FIG. 1 shows an example of an apparatus for implementing the present invention. FIG. 2 shows an example of the arrangement of the mist or spray water generator. 1 ... Loop layer, 2 ... Steel wire rod, 3 ... Horizontal roller conveyor, 4 ... Inclined chain conveyor, 5 ... Mist or spray water, 6 ... Hot water tank, 7 ... Hot water containing air bubbles, 8 ... Horizontal chain conveyor, 9 ... Mist or spray water generator.
Claims (1)
を呈する高温にある鋼線材のリング状コイルを、水平に
展開した形で連続的に移送しながら70℃以上の温水か、
又は気水混相冷媒中に浸漬して、調整冷却してパーライ
ト変態を行なわせる熱処理方法において、ループレイヤ
ーで捲落した鋼線材を冷媒槽へ導びく浸漬用コンベア上
で３〜20sec間空気酸化させた後、ひき続いて、ミスト
又はスプレイ水を該コンベア上を移動する鋼線材に施し
て冷却し、浸漬直前の鋼線材温度を720℃〜900℃の範囲
で、且つ、前記リング状コイルのエッジ部分をセンター
部分よりも低温であるように冷却することを特徴とする
鋼線材の熱処理方法。1. Hot water of 70 ° C. or higher while continuously transferring a ring-shaped coil of steel wire rod which is hot rolled and has a metal structure of austenite at a high temperature while being horizontally expanded,
Alternatively, in the heat treatment method of immersing in a mixed refrigerant of air and water and adjusting and cooling it to carry out pearlite transformation, the steel wire rolled up in the loop layer is air-oxidized for 3 to 20 seconds on a dipping conveyor that leads to the refrigerant tank. After that, subsequently, mist or spray water is applied to the steel wire rod moving on the conveyor to cool it, and the temperature of the steel wire rod immediately before immersion is in the range of 720 ° C. to 900 ° C., and the edge of the ring-shaped coil. A method for heat treating a steel wire rod, comprising cooling the portion so that the temperature is lower than that of the center portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081874A JPH075991B2 (en) | 1988-04-01 | 1988-04-01 | Heat treatment method for steel wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63081874A JPH075991B2 (en) | 1988-04-01 | 1988-04-01 | Heat treatment method for steel wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01255627A JPH01255627A (en) | 1989-10-12 |
| JPH075991B2 true JPH075991B2 (en) | 1995-01-25 |
Family
ID=13758608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63081874A Expired - Fee Related JPH075991B2 (en) | 1988-04-01 | 1988-04-01 | Heat treatment method for steel wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH075991B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101309943B1 (en) * | 2011-08-26 | 2013-09-17 | 주식회사 포스코 | Apparatus for Cooling Wire-rod Coil |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100516517B1 (en) * | 2001-12-24 | 2005-09-26 | 주식회사 포스코 | A method for manufacturing a high carbon wire having homogeneous tensile strength |
| EP1921172B1 (en) * | 2005-08-12 | 2012-11-28 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for production of steel material having excellent scale detachment property, and steel wire material having excellent scale detachment property |
| JP4836121B2 (en) * | 2006-01-13 | 2011-12-14 | 株式会社神戸製鋼所 | Method for producing high carbon steel wire rod excellent in wire drawability |
| JP5215720B2 (en) * | 2008-04-28 | 2013-06-19 | 株式会社神戸製鋼所 | Steel wire rod |
| CN109402356B (en) * | 2018-11-09 | 2020-02-07 | 江阴兴澄合金材料有限公司 | Controlled cooling and controlled rolling method for controlling net shape of bearing steel wire carbide |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60248824A (en) * | 1984-05-24 | 1985-12-09 | Sumitomo Electric Ind Ltd | Direct heat treatment method and equipment for medium and high carbon steel wire rods |
-
1988
- 1988-04-01 JP JP63081874A patent/JPH075991B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101309943B1 (en) * | 2011-08-26 | 2013-09-17 | 주식회사 포스코 | Apparatus for Cooling Wire-rod Coil |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01255627A (en) | 1989-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |