JPH0696746B2 - Shaped steel manufacturing method - Google Patents
Shaped steel manufacturing methodInfo
- Publication number
- JPH0696746B2 JPH0696746B2 JP27526390A JP27526390A JPH0696746B2 JP H0696746 B2 JPH0696746 B2 JP H0696746B2 JP 27526390 A JP27526390 A JP 27526390A JP 27526390 A JP27526390 A JP 27526390A JP H0696746 B2 JPH0696746 B2 JP H0696746B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- temperature
- flange
- recuperation
- heating
- 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 - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 24
- 239000010959 steel Substances 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000001816 cooling Methods 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 239000000463 material Substances 0.000 description 12
- 230000009466 transformation Effects 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007688 edging Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 101100289792 Squirrel monkey polyomavirus large T gene Proteins 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Metal Rolling (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、熱間圧延によって、 フランジ厚（TF）／ウエブ厚（TW）が３以上、ウエブ高
さ（HW）／ウエブ厚（TW）が80以上、の薄肉Ｈ形鋼を始
めとする形鋼を製造するにあたり、その冷却過程におい
て、フランジ部とウエブ部の温度差を小さくすることに
より残留応力の減少を計ること、過冷却による（低温変
態組織の生成による）靭性の劣化を防止することなどの
形鋼の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a flange thickness (T F ) / web thickness (T W ) of 3 or more and a web height (H W ) / web thickness obtained by hot rolling. When manufacturing shaped steels including thin H-shaped steels with (T W ) of 80 or more, in the cooling process, the residual stress is reduced by reducing the temperature difference between the flange and the web. The present invention relates to a method of manufacturing a shaped steel such as preventing deterioration of toughness due to supercooling (due to formation of low temperature transformation structure).
Ｈ形鋼は、フランジ厚とウエブ厚が異なるため、熱間圧
延によって製造する際の冷却過程において、フランジ部
とウエブ部との間に温度差が生じ、このため室温に冷却
された状態では、フランジ部に引張り、ウエブ部に圧縮
の長手方向残留応力が発生し、とくに、フランジ厚とウ
エブ厚が大きく異なる薄肉Ｈ形鋼においてはその値は大
きくなる。Since the H-section steel has a different flange thickness and web thickness, a temperature difference occurs between the flange portion and the web portion in the cooling process when manufacturing by hot rolling, and therefore, in the state of being cooled to room temperature, A residual stress in the longitudinal direction of tensile is generated in the flange portion and compression is generated in the web portion, and the value becomes large especially in the thin H-section steel whose flange thickness and web thickness are greatly different.
この残留応力が存在すると、その大きさにより、耐荷重
の低下、形状不良（ウエブ波の発生）加工時の割れなど
の問題が発生する。The presence of this residual stress causes problems such as reduction in withstand load and cracking during processing of defective shape (generation of web waves) due to its magnitude.
したがって、熱間圧延によるＨ形鋼の製造においては、
その冷却過程において、フランジ部とウエブ部の温度差
を小さくすることが必要になる。Therefore, in the production of H-section steel by hot rolling,
In the cooling process, it is necessary to reduce the temperature difference between the flange portion and the web portion.
この温度差を減少させる方法としては、ウエブ部を加熱
する方法や、フランジ外面を強冷却する方法があり、一
般にはフランジ部外面を強冷却する方法が多く用いられ
ている。As a method of reducing this temperature difference, there are a method of heating the web portion and a method of strongly cooling the outer surface of the flange. Generally, a method of strongly cooling the outer surface of the flange portion is often used.
（従来の技術） 残留応力を軽減する方法としては、特公昭55−43053号
公報、及び特公昭56−35734号公報等に、仕上げ圧延の
前後で、フランジ部を強冷却することにより、フランジ
部とウエブ部の温度差を減少させる方法が、 また特公昭60−37857号公報、特開平１−205028号公報
には、冷却完了時の温度目標、すなわち、フランジ部と
ウエブ部の温度差、冷却時の断面内代表点における目標
温度を決定する方法が、それぞれ開示されている。(Prior Art) As a method of reducing residual stress, Japanese Patent Publication No. 55-43053 and Japanese Patent Publication No. 56-35734 disclose that the flange portion is strongly cooled before and after finish rolling. A method of reducing the temperature difference between the web portion and the web portion is disclosed in Japanese Patent Publication No. Sho 60-37857 and Japanese Patent Laid-Open Publication No. 1-205028. Each method of determining the target temperature at the representative point in the cross section at that time is disclosed.
しかしながら、これらの方法では、TF／TW，HW／TWが大
きくなると、残留応力によるウエブ波が発生しない様
に、フランジ外面の冷却を強化し、フランジ部分の熱容
量を減少させる必要があるが、強冷却のためフランジ冷
却面の組織が悪化し、すなわち、急冷時に低温変態組織
（マルテンサイト、ベイナイト組織をいう）が生成し、
このため、フランジ表面の硬度が上昇し、靭性が劣化し
て加工上の問題が生じる。However, in these methods, when T F / T W and H W / T W become large, it is necessary to strengthen the cooling of the outer surface of the flange and reduce the heat capacity of the flange portion so that web waves due to residual stress do not occur. However, the structure of the flange cooling surface deteriorates due to strong cooling, that is, a low-temperature transformation structure (a martensite or bainite structure) is formed during rapid cooling,
For this reason, the hardness of the flange surface increases, the toughness deteriorates, and processing problems occur.
したがって、これらの方法を、TF／TW，HW／TWの大きい
薄肉Ｈ形鋼に適用することは困難である。Therefore, it is difficult to apply these methods to thin H-section steels with large T F / T W and H W / T W.
（発明が解決しようとする課題） 熱間圧延による形鋼の製造方法であって、その冷却過程
において、フランジ部に、冷却−復熱の熱サイクルを施
すことにより、靭性劣化がなく、残留応力の少ない、形
状の良好なＨ形鋼を安定して製造する方法である。(Problem to be solved by the invention) A method of manufacturing a shaped steel by hot rolling, wherein during the cooling process, a flange portion is subjected to a heat cycle of cooling-recuperation so that there is no deterioration of toughness and residual stress. It is a method for stably producing an H-section steel with a small amount and a good shape.
薄肉Ｈ形鋼においては、冷却過程で、フランジ部に冷却
−復熱の熱サイクルを施す場合、 前にも述べたように、冷却過程で強水冷を行う必要があ
るが、強冷却であるため、フランジ部の復熱温度が不十
分となり、低温変態組織が残存するなどの材質異常を生
じ、靭性が劣化する。In the case of thin H-section steel, when the flange part is subjected to the cooling-recuperation heat cycle in the cooling process, it is necessary to perform strong water cooling in the cooling process as described above, but it is strong cooling. In addition, the reheat temperature of the flange portion becomes insufficient, and a material abnormality such as a low-temperature transformation structure remaining occurs, resulting in deterioration of toughness.
また、逆に復熱温度が十分にとれるような水冷を行なう
と、残留応力の増加によりウエブ波が発生するなどの問
題がある。On the other hand, if water cooling is performed so that the recuperation temperature can be sufficiently taken, there is a problem that a web wave is generated due to an increase in residual stress.
すなわち、目標とする復熱温度を保証するためには、フ
ランジ部の保有する熱容量、復熱時間の確保が必要であ
るが、その対応策として、 復熱ゾーンの延長。又は、 緩冷却化。In other words, in order to guarantee the target recuperation temperature, it is necessary to secure the heat capacity of the flange and the recuperation time, but as a countermeasure to this, the recuperation zone is extended. Or slow cooling.
などを行うと、フランジ部冷却不足によるウエブ波が発
生し、 復熱時間確保のための被冷却材（被圧延材）の走行速
度の低下。If you do so, web waves will be generated due to insufficient cooling of the flange, and the traveling speed of the cooled material (rolled material) will decrease to ensure the recuperation time.
を行うと、水冷ゾーンでの急冷時間も増加し、温度低下
による材質異常が発生する。If this is done, the quenching time in the water cooling zone will also increase, and material abnormalities will occur due to temperature drop.
したがって、薄肉Ｈ形鋼の製造にあたっては、これらの
問題を解決することが必要になる。Therefore, it is necessary to solve these problems in manufacturing the thin H-section steel.
（課題を解決するための手段） この発明は、マルテンサイトなどの低温変態組織の発生
による硬度の上昇、靭性の劣化を防止するために、強水
冷によって温度低下したフランジ部を冷却−復熱の熱サ
イクルの復熱中に、加熱することによって、目標とする
復熱温度、すなわちAc1点近傍の温度に到達させるもの
であり、 その要旨は、 形鋼の熱間圧延に際し、 熱間仕上げ圧延機の入側及び／又は出側にて，フランジ
表面温度を、Ar1点温度に対してはるかに低い温度に一
たん冷却し、その後、フランジ表面温度を保有熱量によ
って複熱昇温させる、冷却−復熱両過程よりなる熱サイ
クルを２回以上繰返す冷却パターンのもとで、 フランジ表面に、冷却過程では冷却水の噴射による冷却
を施し、復熱過程では、最終の冷却過程に続く復熱過程
を除き、Ac1点近傍の温度に達するまでの昇温を補足す
るための加熱を施すことを特徴とする形鋼の製造方法で
ある。(Means for Solving the Problem) The present invention cools a flange portion whose temperature has been lowered by strong water cooling in order to prevent an increase in hardness due to the occurrence of a low-temperature transformation structure such as martensite and a deterioration in toughness. By heating during the recuperation of the heat cycle, the target recuperation temperature, that is, the temperature near the Ac 1 point, is reached.The point is, in the hot rolling of shaped steel, the hot finish rolling mill At the inlet side and / or the outlet side of, the flange surface temperature is cooled to a temperature much lower than the Ar 1- point temperature, and then the flange surface temperature is increased by multiple heat by the retained heat amount. Under the cooling pattern in which the heat cycle consisting of both recuperation processes is repeated twice or more, the flange surface is cooled by jetting cooling water in the cooling process, and in the recuperation process, the recuperation process following the final cooling process. Excluding The method for manufacturing a shaped steel is characterized in that heating is performed to supplement the temperature rise until reaching the temperature near the Ac 1 point.
この明細書において、Ac1点近傍の温度とは、Ac1点温度
より50℃低い温度以上であることを意味し、低温本変態
織とはマルテンサイト、ベイナイト組織をいうものとす
る。In this specification, the temperature in the vicinity Ac 1 point, which means that it is 50 ° C. lower temperatures or higher than the Ac 1 point temperature, shall refer to a martensite, bainite structure and woven cold this transformation.
（作用） まず、この発明において、フランジ部を加熱することに
ついて述べる。(Operation) First, in the present invention, heating of the flange portion will be described.
フランジ部を加熱することは、本来、ウエブ波発生防止
の観点からは逆行するものである。The heating of the flange portion is essentially a reverse operation from the viewpoint of preventing the generation of web waves.
しかし、TF／TWが３以上で熱容量の大きいフランジ部
を、材質異常の発生なしに冷却するには、冷却ゾーンを
長くとって、緩冷却するなどの必要性があるが、効率よ
く、品質保証のできる製品を作り込むためには、 フランジ部を冷却−復熱の熱サイクルで冷却し、ウエブ
波発生防止のため、冷却過程では強冷却を行う必要があ
る。そして、強冷却を行うため、復熱過程においては、
復熱に要する熱容量が不足することから、新らたにAc1
点近傍の復熱温度まで上昇させる手段、すなわち、フラ
ンジ部を加熱することが必要になる。However, in order to cool the flange with T F / T W of 3 or more and a large heat capacity without causing material abnormality, it is necessary to take a long cooling zone and perform slow cooling, etc. In order to create a product that can guarantee quality, it is necessary to cool the flange part in a cooling-recuperation heat cycle and perform strong cooling in the cooling process to prevent the generation of web waves. And in order to perform strong cooling, in the recuperation process,
Since the heat capacity required for recuperation is insufficient, a new Ac 1
It is necessary to heat the means for raising the recuperation temperature near the point, that is, the flange portion.
なお、フランジ部の加熱は復熱過程で行うが、冷却−復
熱の熱サイクルを１回以上繰返した後の、最終の急冷後
の復熱過程で加熱することは、フランジ部とウエブ部の
温度差を大きくすることになるので不適である。The heating of the flange portion is performed in the reheat process, but heating in the reheat process after the final rapid cooling after repeating the cooling-reheat heat cycle one or more times means that the flange portion and the web portion are heated. This is unsuitable because it increases the temperature difference.
つぎに、この発明の実施態様について述べる。Next, an embodiment of the present invention will be described.
走行する被圧延材が、水冷ゾーンを通過後、復熱ゾーン
（空冷ゾーン）を通過中に、フランジ外側面の両側に設
置したフランジ加熱装置により、フランジ面を加熱し、
フランジ部に残在する熱容量による復熱と合わされて、
目標とする復熱温度に到達せしめるものであり、かくす
ることにより材質異常のないＨ形鋼が製造できることに
なる。The material to be rolled travels through the water cooling zone and then, while passing through the recuperating zone (air cooling zone), the flange heating device installed on both sides of the flange outer surface heats the flange surface,
Combined with the heat recovery due to the heat capacity remaining in the flange,
This is to reach the target reheat temperature, and by doing so, H-section steel with no material abnormality can be manufactured.
以上さらに詳しく、第１図により説明する。The above will be described in more detail with reference to FIG.
第１図には、紙面の左から順に、粗ユニバーサルミル
３、エッジングミル４、仕上げユニバーサルミル５を設
置した形鋼の圧延ラインに、エッジングミル４と仕上げ
ユニバーサルミル５の間に、水冷装置１−１と１−２を
間隔を置いて配し、さらに仕上げユニバーサルミル５の
出側（紙面の右側）に水冷装置１−３を配置している。In FIG. 1, a water cooling device 1 is installed between the edging mill 4 and the finishing universal mill 5 in a section steel rolling line in which a rough universal mill 3, an edging mill 4 and a finishing universal mill 5 are installed in order from the left side of the drawing. -1 and 1-2 are arranged at intervals, and a water cooling device 1-3 is further arranged on the exit side (right side of the drawing) of the finishing universal mill 5.
水冷装置１−１と１−２の間、水冷装置１−２と仕上げ
ユニバーサルミルを挟んで水冷装置１−３の間は水冷後
の復熱ゾーンとなる。Between the water cooling devices 1-1 and 1-2, and between the water cooling device 1-2 and the finishing universal mill, between the water cooling devices 1-3 is a recuperation zone after water cooling.
粗圧延を終えた被圧延材は、エッジングミルを通過し、
水冷−復熱−水冷−復熱（仕上げ圧延を挟む）−水冷−
復熱の熱サイクルの冷却パターンで冷却される。After the rough rolling, the rolled material passes through the edging mill,
Water cooling-Recuperation-Water cooling-Recuperation (between finish rolling) -Water cooling-
It is cooled in the cooling pattern of the heat cycle of recuperation.
復熱時の加熱装置は復熱ゾーンの後方に設置し、復熱工
程の後半で加熱するようになっている。The heating device at the time of recuperation is installed behind the recuperation zone and heats in the latter half of the recuperation process.
なお、復熱中の加熱を誘導加熱で行う場合、水冷直後に
これを設置すると、被圧延材のフランジ面に付着した水
滴が誘導コイルに付着し、絶縁不良に至らしめるので好
ましくない。When the heating during recuperation is performed by induction heating, it is not preferable to install it immediately after cooling with water, because water droplets adhering to the flange surface of the material to be rolled adhere to the induction coil, leading to insulation failure.
この加熱装置は、第２図に示すように、フランジ外側面
に設置され、被圧延材長手方向に複数個設置することも
よく、水冷による冷却幅と加熱装置の上流に設置した温
度計（走査形）での測温結果より、加熱すべき幅を決定
し、この幅に応じて加熱コイル幅を選定するとともに、
投入すべき電力量を設定し通電する。As shown in FIG. 2, this heating device is installed on the outer surface of the flange, and it is also possible to install a plurality of heating devices in the longitudinal direction of the material to be rolled. The cooling width by water cooling and the thermometer installed upstream of the heating device (scanning) The width to be heated is determined from the temperature measurement result of the shape) and the heating coil width is selected according to this width.
Set the amount of power to be applied and energize.
又、フランジ外側面の上下方向に別個の加熱装置を配置
することにより、フランジ外側面の上下を各々別個の加
熱コイルで加熱する、すなわち、異なる投入電力量にて
加熱することができ、水冷後、フランジの上部と下部と
で温度が異なる場合にも好適に対応することができる。Also, by disposing separate heating devices in the vertical direction on the outer side surface of the flange, the upper and lower sides of the outer side surface of the flange can be heated by separate heating coils, that is, they can be heated with different amounts of input power, and after cooling with water. Even when the temperature of the upper part and the lower part of the flange are different, it is possible to appropriately cope with the temperature.
さらに、加熱深さは、周波数により変更することができ
るので、シミュレーターの結果より事前に設定すること
で、被圧延材の形状寸法、冷却条件などの変化に対応す
ることができる。Furthermore, since the heating depth can be changed according to the frequency, it is possible to cope with changes in the shape and dimensions of the material to be rolled, cooling conditions, etc. by setting in advance from the results of the simulator.
（実施例） 転炉で溶製し、連続鋳造で鋳造したビームブランクを用
いて、 ウエブ高さ :750mm フランジ幅 :200mm ウエブ厚さ :9mm フランジ厚さ :28mm の薄肉Ｈ形鋼に熱間圧延した。(Example) Using a beam blank melted in a converter and cast by continuous casting, hot-rolled into thin H-section steel with a web height of 750 mm, a flange width of 200 mm, a web thickness of 9 mm, and a flange thickness of 28 mm. did.
この熱間圧延は、第１図に示す圧延ラインで、その冷却
過程においては、水冷（１）−復熱（１）−水冷（２）
−復熱（２）−水冷（３）−復熱（３）の冷却パターン
で、この発明の適合例として復熱（１）及び（２）の過
程で加熱した場合と、比較例として復熱過程で加熱しな
い場合の冷却条件で冷却した。これらの条件を表１に示
す。This hot rolling is performed by the rolling line shown in FIG. 1, and in the cooling process, water cooling (1) -recuperation (1) -water cooling (2).
-Recuperation (2) -Water cooling (3) -Recuperation (3) cooling pattern, in the case of heating in the process of recuperation (1) and (2) as a compatible example of the present invention, and recuperation as a comparative example It was cooled under the cooling conditions when it was not heated in the process. Table 1 shows these conditions.
なお、表１に示す水冷はウエブ波の発生しない強水冷条
件とした。 The water cooling shown in Table 1 was a strong water cooling condition in which web waves were not generated.
この冷却条件下でのフランジ外側面表面温度の変化を第
３図に示すが、比較例は復熱過程における最高到達温度
がAc1点以下であり、組織調査によるとフランジ表面に
マルテンサイト、及びベイナイト組織が認められた。The change in the surface temperature of the outer surface of the flange under this cooling condition is shown in Fig. 3. In the comparative example, the highest temperature reached in the recuperation process was Ac 1 point or less, and according to the structure investigation, martensite on the flange surface, and A bainite structure was observed.
これに対し、適合例は当然のことながら復熱過程におけ
る最高到達温度がAc1点以上であり、低温変態組織は認
められなかった。On the other hand, as a matter of course, the maximum temperature reached in the recuperation process was Ac 1 point or higher in the conforming example, and no low-temperature transformation structure was observed.
また、Ｈ形鋼断面のフランジ外側表面より内に向けての
硬さ変化を第４図に示すが、比較例は内側の硬さ（安定
した硬さを示す領域の値）にくらべ表面の硬さは40Hv
（ビッカース硬さ）程度高くなっており、このため、製
品の切断、及び曲げなどの加工性に問題が生じた。Fig. 4 shows the change in hardness from the outside surface of the flange of the H-section steel to the inside, but in the comparative example, the hardness of the surface is higher than the hardness of the inside (the value in the region showing stable hardness). It is 40Hv
(Vickers hardness) is high, which causes problems in workability such as cutting and bending of the product.
これに対し、適合例は、硬さの差は20Hv程度と比較例の
半分であり、加工性も良好であった。On the other hand, in the conforming example, the difference in hardness was about 20 Hv, which was half that of the comparative example, and the workability was also good.
したがって、この発明方法は薄肉Ｈ形鋼の製造方法とし
て非常に有効な方法といえる。Therefore, it can be said that the method of the present invention is a very effective method for producing a thin H-section steel.
（発明の効果） この発明は、熱間圧延により、薄肉Ｈ形鋼などを製造す
るにあたり、その冷却過程において、フランジ外側面
を、冷却と加熱を加えた復熱の熱サイクルによる冷却を
施すことにより、ウエブ波の発生がなく、かつ、材質異
常のない形鋼を効率的に製造できるようにしたものであ
る。(Effect of the Invention) According to the present invention, when manufacturing thin H-section steel or the like by hot rolling, in the cooling process, the flange outer surface is cooled by a heat cycle of recuperation with cooling and heating. Thus, it is possible to efficiently manufacture a shaped steel that does not generate a web wave and has no material abnormality.
第１図は、粗ユニバーサルミル、エッジングミル、及び
仕上げユニバーサルミル、さらに冷却装置、及び加熱装
置の配置を示す平面図、 第２図は、フランジ部加熱装置の斜視図、第３図は、こ
の発明の適合例と比較例の、冷却過程におけるフランジ
外側面表面温度の変化を示すグラフ、及び、 第４図は、この発明の適合例と比較例のフランジ外側面
の表面より内に向けての硬さ変化を示すグラフである。 １−1,1−2,1−３…フランジ水冷装置 ２…フランジ加熱装置本体 ２−１…フランジ加熱用鉄心 ２−２…フランジ加熱用誘導コイル ３…粗ユニバーサルミル ４…エッジングミル ５…仕上げユニバーサルミル ６…Ｈ形鋼 ６−１…フランジ ６−２…ウエブFIG. 1 is a plan view showing the arrangement of a rough universal mill, an edging mill, a finishing universal mill, a cooling device, and a heating device, FIG. 2 is a perspective view of a flange heating device, and FIG. The graph which shows the change of the flange outer side surface temperature in the cooling process of the conforming example of the invention and a comparative example, and FIG. It is a graph which shows a hardness change. 1-1, 1-2, 1-3 ... Flange water cooling device 2 ... Flange heating device body 2-1 ... Flange heating iron core 2-2 ... Flange heating induction coil 3 ... Coarse universal mill 4 ... Edging mill 5 ... Finishing Universal mill 6 ... H-shaped steel 6-1 ... Flange 6-2 ... Web
Claims (1)
表面温度を、Ar1点温度に対してはるかに低い温度に一
たん冷却し、その後、フランジ表面温度を保有熱量によ
って復熱昇温させる、冷却−復熱両過程よりなる熱サイ
クルを２回以上繰返す冷却パターンのもとで、 フランジ表面に、冷却過程では冷却水の噴射による冷却
を施し、復熱過程では、最終の冷却過程に続く復熱過程
を除き、Ac1点近傍の温度に達するまでの昇温を補足す
るための加熱を施すことを特徴とする形鋼の製造方法。1. Hot rolling of a shaped steel is performed by cooling the flange surface temperature to a temperature much lower than the Ar 1 point temperature on the inlet side and / or the outlet side of a hot finish rolling mill. After that, the flange surface temperature is reheated by the amount of retained heat, and the heat cycle consisting of both cooling and reheating processes is repeated twice or more. Manufacturing of shaped steel characterized by performing cooling, and in the reheating process, except for the reheating process following the final cooling process, heating to supplement the temperature rise until reaching the temperature near the Ac 1 point. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27526390A JPH0696746B2 (en) | 1990-10-16 | 1990-10-16 | Shaped steel manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27526390A JPH0696746B2 (en) | 1990-10-16 | 1990-10-16 | Shaped steel manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04154917A JPH04154917A (en) | 1992-05-27 |
| JPH0696746B2 true JPH0696746B2 (en) | 1994-11-30 |
Family
ID=17552982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27526390A Expired - Lifetime JPH0696746B2 (en) | 1990-10-16 | 1990-10-16 | Shaped steel manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0696746B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2837056B2 (en) * | 1993-02-04 | 1998-12-14 | 新日本製鐵株式会社 | Method for producing low carbon equivalent rolled section steel by controlled rolling |
| TWI526258B (en) * | 2013-12-27 | 2016-03-21 | Continuous linear rolling equipment for linear slides |
-
1990
- 1990-10-16 JP JP27526390A patent/JPH0696746B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04154917A (en) | 1992-05-27 |
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