JPH0832329B2 - Method for manufacturing H-section steel - Google Patents
Method for manufacturing H-section steelInfo
- Publication number
- JPH0832329B2 JPH0832329B2 JP62115867A JP11586787A JPH0832329B2 JP H0832329 B2 JPH0832329 B2 JP H0832329B2 JP 62115867 A JP62115867 A JP 62115867A JP 11586787 A JP11586787 A JP 11586787A JP H0832329 B2 JPH0832329 B2 JP H0832329B2
- Authority
- JP
- Japan
- Prior art keywords
- web
- flange
- section steel
- rolling
- residual stress
- 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 27
- 239000010959 steel Substances 0.000 title claims description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000034 method Methods 0.000 title description 8
- 238000005096 rolling process Methods 0.000 claims description 25
- 238000012937 correction Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012669 compression test Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、Ｈ形鋼の製造方法に係り、特に残留応力に
よって発生するウエブ波を防止するＨ形鋼の製造方法に
関する。Description: TECHNICAL FIELD The present invention relates to a method for producing an H-section steel, and more particularly to a method for producing an H-section steel for preventing a web wave generated by residual stress.
＜従来の技術およびその問題点＞ Ｈ形鋼の断面形状は、一般に第３図に示すようにフラ
ンジ１の厚さがウエブ２の厚さよりも厚くなっているた
め、圧延過程でウエブ２の冷却速度がフランジ１に比較
して速くなり、しかもデスケーリング水等がウエブ２上
に溜まって冷却を早めるから、仕上圧延終了時にはフラ
ンジ温度がウエブ温度よりも200℃以上も高くなる場合
がある。<Prior art and its problems> The cross-sectional shape of H-section steel generally has a flange 1 thicker than a web 2 as shown in FIG. Since the speed is higher than that of the flange 1, and descaling water and the like are accumulated on the web 2 to accelerate the cooling, the flange temperature may be higher than the web temperature by 200 ° C. or more at the end of finish rolling.
この圧延終了時のフランジ１とウエブ２の仕上温度条
件および圧延後のフランジ１とウエブ２の冷却速度差の
ため室温まで冷却された状態においては、フランジ１が
ウエブ２に比べて相対的に短くなり、第４図に示すよう
にフランジ１に引張り、ウエブ２に圧縮の長手方向残留
応力が発生する。そうして、ウエブ２の圧縮残留応力が
臨界座屈応力を超えると、ウエブ２にウエブ波が発生し
形状不良となる。Due to the finishing temperature conditions of the flange 1 and the web 2 at the end of rolling and the cooling rate difference between the flange 1 and the web 2 after rolling, the flange 1 is relatively shorter than the web 2 in the state of being cooled to room temperature. As shown in FIG. 4, the flange 1 is pulled, and a compressive longitudinal residual stress is generated in the web 2. Then, when the compressive residual stress of the web 2 exceeds the critical buckling stress, a web wave is generated in the web 2 and the shape becomes defective.
この残留応力を軽減させる方法としては、例えば特公
昭41−20336号公報や特開昭56−152928号公報、特開昭5
8−93819号公報などに仕上圧延機出口にフランジ冷却手
段やウエブ加熱手段を設けるものが多数提案されてい
る。As a method for reducing this residual stress, for example, JP-B-41-20336, JP-A-56-152928 and JP-A-5-
A large number of proposals of a flange cooling means and a web heating means at the exit of the finishing mill have been proposed in Japanese Patent Publication No. 8-93819.
しかしながら、このようなフランジ冷却手段やウエブ
加熱手段を既設ラインに配設するには、スペースやレイ
アウトあるいは温度条件等により制約されるから、製品
の製造サイズが限定されることになる。However, in order to arrange such flange cooling means and web heating means on the existing line, the manufacturing size of the product is limited because it is restricted by the space, layout, temperature conditions and the like.
本発明は、上記の事情に鑑みなされたものであって、
フランジの厚さがウエブの厚さに対して非常に大きいＨ
形鋼の製造に際しても、設備の増設を伴わないでウエブ
波のないＨ形鋼を製造するのに好適な方法を提供するこ
とを目的とする。The present invention has been made in view of the above circumstances,
Flange thickness is much larger than web thickness H
It is an object of the present invention to provide a method suitable for producing an H-section steel without a wave wave even when manufacturing a section steel without adding equipment.
＜問題点を解決するための手段＞ 本発明は、仕上ユニバーサル圧延機を用いてＨ形鋼を
仕上圧延する際の最終パスにおいて、圧延中のＨ形鋼の
ウブの熱歪εＷを求めて、この熱歪εＷに相当するフラ
ンジの付加圧下量Δtfを下記式 Δtf＝｛１−1/（１＋εＷ）｝×α×tf ここで、α：修正係数（＞１）、tf:フランジ厚みで
ある。<Means for Solving Problems> The present invention seeks the thermal strain ε W of the Ubu of the H-section steel during rolling in the final pass when finish-rolling the H-section steel using a finish universal rolling mill. , The additional amount of reduction Δtf of the flange corresponding to this thermal strain ε W is expressed by the following formula Δtf = {1-1 / (1 + ε W )} × α × tf where α: correction coefficient (> 1), tf: flange thickness Is.
を用いて算出し、この付加圧下量Δtfを最終パスの仕上
圧下量Δtoに加算して得られた修正圧下量Δtsを用い
て、フランジを強圧下圧延することにより、上記目的を
達成するものである。By using the corrected reduction amount Δts obtained by adding the additional reduction amount Δtf to the finishing reduction amount Δto in the final pass, the flange is subjected to strong reduction rolling to achieve the above object. is there.
＜作 用＞ 本発明者らは、ウエブ波発生の防止のためにＨ形鋼の
ウエブの残留応力の軽減について種々検討した結果、こ
のウエブの残留応力は圧延中のウエブ温度とフランジ温
度との差によってウエブに発生する熱歪によって支配さ
れるのであるが、この圧延中のウエブの熱歪は、圧下ス
ケジュールの調整によりフランジを強圧下することによ
り減少させることが可能であることを見出し、この知見
に基づいて本発明を完成させるに至ったのである。<Operation> As a result of various studies on the reduction of the residual stress of the web of the H-section steel in order to prevent the generation of web waves, the present inventors found that the residual stress of the web is different between the web temperature and the flange temperature during rolling. Although it is governed by the thermal strain generated in the web by the difference, the thermal strain of the web during rolling is found to be reduced by strongly reducing the flange by adjusting the reduction schedule, The present invention has been completed based on the findings.
すなわち、Ｈ形鋼を圧延中にウエブの残留応力によっ
てウエブ波が発生しやすいウエブ厚の薄いＨ形鋼を圧延
する場合には、圧延中のウエブの熱歪を計算して求め、
それに応じて圧下スケジュールを調整することによっ
て、ウエブの残留応力を減少させることが可能である。That is, when rolling H-section steel having a thin web thickness in which web waves are likely to be generated due to residual stress of the web during rolling of H-section steel, the thermal strain of the web during rolling is calculated and obtained.
By adjusting the reduction schedule accordingly, it is possible to reduce the residual stress in the web.
ウエブの残留応力の大きさは、Ｈ形鋼の断面寸法や仕
上温度によって決まり、例えば、前出の特開昭58−9381
9号公報に記載されているウエブ波評価指数Wcを求める
ための下記（１）式を用いて決定することができる。The magnitude of the residual stress of the web is determined by the cross-sectional dimension of the H-section steel and the finishing temperature. For example, the above-mentioned JP-A-58-9381.
It can be determined using the following equation (1) for obtaining the web wave evaluation index Wc described in Japanese Patent Publication No.
ここで、 Wc:ウエブ波評価指数（ウエブの平均圧縮残留応力と臨
界座屈応力の比） Tf,Tw:フランジおよびウエブの仕上温度（℃） tf,tw:フランジおよびウエブの厚み（mm） Hw:ウエブ内幅（mm） a0〜a5,n1,n2:定数 TA1,TA3:フェライト変態開始および終了温度（℃） このウエブ波評価指数を示す（１）式は、具体的には
下記（1a）式で表すことができる。 Where, Wc: Web wave evaluation index (ratio of average compressive residual stress of web to critical buckling stress) Tf, Tw: Finishing temperature of flange and web (℃) tf, tw: Thickness of flange and web (mm) Hw : Web width (mm) a 0 to a 5 ,, n 1 , n 2 : constant T A1 , T A3 : ferrite transformation start and end temperature (° C) The equation (1) showing this web wave evaluation index is specifically the following equation (1a): Can be expressed as
ここで、（1a）式のウエブ波評価指数Wcはウエブの平
均圧縮残留応力σｗと臨界座屈応力σｃとの比であるか
ら、ウエブ波評価指数Wcと臨界座屈応力σｃの値がわか
れば、下記（２）式でウエブの平均圧縮残留応力σｗを
求めることができる。 Here, since the web wave evaluation index Wc of the equation (1a) is the ratio of the average compressive residual stress σw of the web and the critical buckling stress σc, if the values of the web wave evaluation index Wc and the critical buckling stress σc are known, The average compressive residual stress σw of the web can be calculated by the following equation (2).
σｗ＝Wc×σｃ ……（２） このウエブの平均圧縮残留応力の殆どが仕上圧延前の
熱歪に起因するものであるから、仕上ユニバーサル圧延
機においてウエブ波が発生した場合、第２図に示すよう
に残留応力分布曲線Ａがウエブの臨界座屈応力Ｂを超え
ることになる。そこでウエブ２の圧下量はそのままと
し、フランジ１に強圧下を加えると残留応力分布は曲線
Ｃで示すようにウエブの臨界座屈応力以下となってウエ
ブ波が発生しない。したがって、仕上ユニバーサル圧延
機に与えるフランジ１の圧下量を、通常のフランジ圧下
量（フランジの延伸率とウエブの延伸率が等しくなるよ
うに設定した圧下量）より大きくして、ウエブの熱歪相
当の圧延歪をウエブに発生させることにより、ウエブの
平均圧縮残留応力は減少する。σw = Wc × σc (2) Most of the average compressive residual stress of this web is due to the thermal strain before finish rolling. As shown, the residual stress distribution curve A exceeds the critical buckling stress B of the web. Therefore, if the amount of reduction of the web 2 is left as it is and a strong reduction is applied to the flange 1, the residual stress distribution becomes less than the critical buckling stress of the web as shown by the curve C, and no web wave is generated. Therefore, the amount of reduction of the flange 1 given to the finishing universal rolling mill is made larger than the usual amount of reduction of the flange (the amount of reduction set so that the stretch ratio of the flange and the stretch ratio of the web are equal), and the heat distortion of the web is equivalent. By generating the rolling strain of the web in the web, the average compressive residual stress of the web is reduced.
＜実施例＞ 以下に、本発明の実施例について図面を参照して説明
する。第１図は、本発明方法の手順を示す流れ図であ
る。<Examples> Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing the procedure of the method of the present invention.
Ｈ形鋼の断面寸法（ウエブ厚みtw,フランジ厚みtf,
ウエブ内幅Hw）とウエブおよびフランジの仕上予想温度
Tw,Tfを予測する。これらの温度予測は伝熱方程式を用
いて計算によって求めることができるが、繰り返し圧延
される寸法のＨ形鋼では、実測データの平均値を使用す
ることが簡便である。Sectional dimensions of H-section steel (web thickness tw, flange thickness tf,
Inner width of web Hw) and expected finish temperature of web and flange
Predict Tw and Tf. These temperature predictions can be obtained by calculation using a heat transfer equation, but it is convenient to use the average value of the actual measurement data for the H-section steel of the dimension that is repeatedly rolled.
ついで、前記（２）式を用いてウエブに発生するウ
エブの平均圧縮残留応力σｗを求める。そのためには、
まずウエブの臨界座屈応力σｃを求める必要があるが、
これは仕上温度と同じ高温での圧縮試験で求めることが
できる。Next, the average compressive residual stress σw of the web generated in the web is obtained by using the equation (2). for that purpose,
First, it is necessary to obtain the critical buckling stress σc of the web.
This can be obtained by a compression test at the same high temperature as the finishing temperature.
次に、この平均圧縮残留応力σｗからウエブの熱歪
εｗを求める。Next, the thermal strain εw of the web is obtained from the average compressive residual stress σw.
εｗ＝σw/E ……（３） ここで、E;ヤング率である。εw = σw / E (3) Here, E is Young's modulus.
このウエブの熱歪εｗに相当するフランジの付加圧
下量Δtfを下記（４）式により求める。The amount of additional pressure reduction Δtf of the flange corresponding to the thermal strain εw of this web is obtained by the following equation (4).
Δtf＝｛１−1/（１＋εｗ）｝×α×tf ……（４） ここで、α：修正係数（＞１）である。Δtf = {1-1 / (1 + εw)} × α × tf (4) where α is a correction coefficient (> 1).
前記（４）で求めた付加圧下量Δtfを、最終パスの
仕上圧下量Δtoに加算して修正圧下量Δtsを求める。The additional reduction amount Δtf obtained in (4) above is added to the finishing reduction amount Δto in the final pass to obtain the corrected reduction amount Δts.
Δts＝Δto＋Δtf ……（５） この修正圧下量Δtsを圧下スケジュールに取り込む
ことによって、Ｈ形鋼に強圧下圧延を施す。Δts = Δto + Δtf (5) The H-section steel is subjected to strong reduction rolling by incorporating the corrected reduction amount Δts in the reduction schedule.
つぎに、本発明をウエブ幅:300mm×フランジ高さ:150
mmで、ウエブ厚みtw:6mm、フランジ厚みtf:12mm（tw/tf
＝1/2）、ウエブ内幅Hw:276mmの寸法のＨ形鋼に適用し
た例について説明する。Next, the present invention is a web width: 300 mm × flange height: 150
mm, web thickness tw: 6mm, flange thickness tf: 12mm (tw / tf
= 1/2), and an example applied to an H-section steel having a web inner width Hw: 276 mm.
まず、ウエブ仕上予想温度Twおよびフランジ仕上予想
温度Tfを予測して、それぞれ700℃および800℃を得た。First, the predicted web finishing temperature Tw and the predicted flange finishing temperature Tf were predicted to obtain 700 ° C. and 800 ° C., respectively.
ついで、上記の諸条件を用いて（1a）式でウエブ波評
価指数Wcを求めたところ、1.60を得た。Then, the web wave evaluation index Wc was calculated by the equation (1a) using the above conditions, and was 1.60.
一方、上記Ｈ形鋼の臨界座屈応力σｃを高温での圧縮
試験を求めたところ、試験温度700℃で10kgf/mm2である
ことから、ウエブの平均圧縮残留応力σｗは（２）式に
よって、 σｗ＝10×1.6＝16kgf/mm2 として求めた。つぎに、このＨ形鋼の700℃でのヤング
率Ｅは1.55×104kgf/mm2であるから、（３）式を用いて
ウエブの熱歪εｗを εｗ＝16/1.55×104＝10.3×10-4 として求め、続いて（４）式を用いて修正係数αを1.2
として付加圧下量Δtfを演算して、 Δtf＝{１−1/(１＋10.3×10-4)}×1.2×12＝0.015mm を得た。On the other hand, when the compression buckling stress σc of the above H-section steel was obtained by a compression test at a high temperature, it was 10 kgf / mm 2 at a test temperature of 700 ° C. Therefore, the average compressive residual stress σw of the web was calculated by the equation (2). , Σw = 10 × 1.6 = 16 kgf / mm 2 . Next, since the Young's modulus E of this H-shaped steel at 700 ° C. is 1.55 × 10 4 kgf / mm 2 , the thermal strain εw of the web is εw = 16 / 1.55 × 10 4 = using equation (3). Calculated as 10.3 × 10 -4 , and then using the formula (4), set the correction coefficient α to 1.2
Then, the additional reduction amount Δtf was calculated to obtain Δtf = {1-1 / (1 + 10.3 × 10 −4 )} × 1.2 × 12 = 0.015 mm.
そして、仕上ユニバーサル圧延機における最終パスで
の通常のフランジ圧下量Δtoは0.1mmであるので、
（５）式から修正圧下量Δtsは Δts＝0.1＋0.015＝0.115mm を得た。And since the normal flange reduction Δto in the final pass in the finishing universal rolling mill is 0.1 mm,
From equation (5), the corrected rolling reduction amount Δts was Δts = 0.1 + 0.015 = 0.115 mm.
そこで、得られた修正圧下量Δtsを用いて仕上ユニバ
ーサル圧延機の圧下スケジュールを修正し、Ｈ形鋼フラ
ンジに強圧下圧延した結果、ウエブ波のないＨ形鋼を製
造することができた。Therefore, the rolling schedule of the finishing universal rolling mill was corrected using the obtained corrected rolling amount Δts, and the H-shaped steel flange was subjected to the strong reduction rolling, and as a result, the H-shaped steel without web waves could be manufactured.
＜発明の効果＞ 以上説明したように、本発明によれば、フランジの厚
さがウエブの厚さに対して非常に大きいＨ形鋼の製造に
際して、ウエブ波の発生を防止することが可能になった
ので、次のような効果を奏するものである。<Effects of the Invention> As described above, according to the present invention, it is possible to prevent the generation of a web wave when manufacturing an H-section steel in which the thickness of the flange is much larger than the thickness of the web. Now, it has the following effects.
既設ラインの改造等を行わずに、ウエブ厚の薄いＨ
形鋼製品が製造可能である。Thin web without modification of existing line
Shaped steel products can be manufactured.
本発明方法をウエブ加熱やフランジ冷却と組合わせ
ることにより、大幅なウエブの薄肉化の達成が可能であ
る。By combining the method of the present invention with web heating and flange cooling, it is possible to achieve a significant reduction in web thickness.
第１図は、本発明方法の手順を示す流れ図、第２図は、
フランジ強圧下時の残留応力の分布を示す断面図、第３
図は、Ｈ形鋼の断面図、第４図は、Ｈ形鋼に発生する残
留応力の分布を示す断面図である。 １……フランジ,2……ウエブ， Ａ……残留応力分布曲線,B……ウエブ波限界応力線,C…
…強圧下時の残留応力分布曲線。FIG. 1 is a flow chart showing the procedure of the method of the present invention, and FIG.
Sectional drawing showing distribution of residual stress when flange is pressed down, 3rd
FIG. 4 is a sectional view of H-section steel, and FIG. 4 is a sectional view showing distribution of residual stress generated in H-section steel. 1 ... Flange, 2 ... Web, A ... Residual stress distribution curve, B ... Web wave limit stress line, C ...
… Residual stress distribution curve under high pressure.
Claims (1)
仕上圧延する際の最終パスにおいて、圧延中のＨ形鋼の
ウエブの熱歪εＷを求めて、この熱歪εＷに相当するフ
ランジの付加圧下量Δtfを下記式を用いて算出し、この
付加圧下量Δtfを最終パスの仕上圧下量Δtoに加算して
得られた修正圧下量Δtsを用いて、フランジを強圧下圧
延することを特徴とするＨ形鋼の製造方法。 Δtf＝｛１−1/（１＋εＷ）｝×α×tf ここで、α：修正係数（＞１）、tf:フランジ厚みであ
る。1. A thermal strain ε W of a web of H-section steel being rolled is obtained in the final pass of finish-rolling H-section steel using a finish universal rolling mill and corresponds to this thermal strain ε W. Calculate the additional reduction amount Δtf of the flange using the following formula, and use the corrected reduction amount Δts obtained by adding this additional reduction amount Δtf to the finishing reduction amount Δto of the final pass to perform the strong reduction rolling of the flange. A method for producing an H-section steel, characterized by: Δtf = {1-1 / (1 + ε W )} × α × tf where α is a correction coefficient (> 1) and tf is a flange thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62115867A JPH0832329B2 (en) | 1987-05-14 | 1987-05-14 | Method for manufacturing H-section steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62115867A JPH0832329B2 (en) | 1987-05-14 | 1987-05-14 | Method for manufacturing H-section steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63281701A JPS63281701A (en) | 1988-11-18 |
| JPH0832329B2 true JPH0832329B2 (en) | 1996-03-29 |
Family
ID=14673118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62115867A Expired - Lifetime JPH0832329B2 (en) | 1987-05-14 | 1987-05-14 | Method for manufacturing H-section steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0832329B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558317A (en) * | 1978-07-03 | 1980-01-21 | Nippon Steel Corp | Residual stress reducing method of h-beam |
| JPS57168701A (en) * | 1981-04-08 | 1982-10-18 | Kawasaki Steel Corp | Deciding method for web waving in rolling of h-steel |
-
1987
- 1987-05-14 JP JP62115867A patent/JPH0832329B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63281701A (en) | 1988-11-18 |
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