JPS5834130A - Production of h-beam having less residual stress - Google Patents
Production of h-beam having less residual stressInfo
- Publication number
- JPS5834130A JPS5834130A JP56131207A JP13120781A JPS5834130A JP S5834130 A JPS5834130 A JP S5834130A JP 56131207 A JP56131207 A JP 56131207A JP 13120781 A JP13120781 A JP 13120781A JP S5834130 A JPS5834130 A JP S5834130A
- Authority
- JP
- Japan
- Prior art keywords
- web
- residual stress
- flange
- finish rolling
- flanges
- 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.)
- Granted
Links
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は残留応力の少ないＨ形鋼の製造方法に係り、４
１１に数値的に仕上圧延温度を制御で龜る製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing H-beam steel with low residual stress,
Part 11 relates to a manufacturing method in which the finish rolling temperature is numerically controlled.
Ｈ形鋼ｔｖＷＲｒＭ性状は嬉１図に示す如く通常フラン
ジ１の厚さがウェブ２の厚さよりも厚くなっているため
、熱延過程でウェブ２の冷却速度が７？／ジ１に比較し
て速くな砂、仕上圧部終了時にはフランジ温度がクエプ
温度よシも２００℃以上も高くなる場合がある。この圧
延終了時の７ランジｌとウェブ２の仕上温度条件および
圧延後の７ツンジ１とウェブ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がウェブ２
に比べて相対的に短くなシ、第２図に示すようにフラン
ジ１に引張り、ウェブ２に圧縮の長手方向残留応力が発
生する。残留応力が存在すると、耐荷力の低下、形状不
良（ウェブ波）、加工時の割れなどの問題を発生する。As shown in Figure 1, the properties of the H-shaped steel tvWRrM are such that the thickness of the flange 1 is usually thicker than the thickness of the web 2, so the cooling rate of the web 2 during the hot rolling process is 7mm. When the sand speed is faster than that of 1, the flange temperature may be 200°C or more higher than the Kuep temperature at the end of the finishing pressure section. Due to the finishing temperature conditions of the 7 flange 1 and the web 2 at the end of rolling and the difference in cooling rate between the 7 flange 1 and the web 2 after rolling, the flange 1 is cooled to room temperature.
2, tensile and compressive longitudinal residual stresses are generated in the flange 1 and in the web 2, as shown in FIG. The presence of residual stress causes problems such as a decrease in load-bearing capacity, poor shape (web waves), and cracking during processing.
従来、残留応力を軽減する方法が種々開示されているが
、それらを列記すると次の如くである。Conventionally, various methods for reducing residual stress have been disclosed, and they are listed as follows.
囚 圧延時に７ランジを冷却する方法（４１公昭４ｌ−
２０３３６）
０ 圧延時にウェブを保温する方法（特開昭５Ｏ−１３
３１１０）
０ 正弧終了後に７う／ジを冷却する方法（４１１公昭
４７−３１４８１）
０ 圧延終了後にクエプを加熱あるいは保温する方法（
特公昭４７−３２１６４．％公＠５４−２０４４２）
■ 冷却床上で７ランジを冷却する方法（特公昭５ｌ−
５６０７）
上記のなかで、作業能率の点ですぐれているのは囚、＠
の方法であるが、これを実行する場合に最終仕上正弧に
おける仕上温度条件を具体的にどのＳ＊にすべきかが問
題である。Method of cooling 7 lunges during rolling (41 Kosho 4l-
20336) 0 Method of keeping web warm during rolling (Unexamined Japanese Patent Publication No. 50-13
3110) 0 Method of cooling 7 ug/ji after completion of forward arcing (411 Kosho 47-31481) 0 Method of heating or keeping heat of kuep after completion of rolling (
Special Publication Showa 47-32164. %Ko@54-20442) ■ Method of cooling 7 lunges on a cooling bed (Special Koko Showa 5l-
5607) Among the above, the one that is superior in terms of work efficiency is the prisoner @
However, when carrying out this method, the problem is which S* should be the finishing temperature condition for the final finishing positive arc.
本発明の目的は、製品の残留応力との関連において上記
の最終仕上正弧温度を具体的に決定できる残留応力の少
ないＨ形鋼の製造方法を提供するにある。An object of the present invention is to provide a method for manufacturing an H-beam steel with low residual stress, which can specifically determine the final finishing positive arc temperature in relation to the residual stress of the product.
本発明の要旨とするところは次のとおりである。The gist of the present invention is as follows.
すなわちｋＨ形鋼のフランジおよびウェブの熱間正弧温
度を制御する残留応力の少ないＨ形鋼の製造方法におい
て、前記Ｈ形鋼の残留応力を前記フランジおよびウェブ
の仕上圧延温度および断面寸法の関数とする下記２式で
表示し、この２式よシ目標とする残留応力に対する仕上
圧延温度を求め鋏仕上圧延温度になる如く前記フランジ
とウェブＯ温度を調整することを特徴とする残留応力の
少ないＨ形鋼の製造方法である。That is, in a method for manufacturing an H-section steel with low residual stress in which the hot normal arc temperature of the flange and web of the kH-section steel is controlled, the residual stress of the H-section steel is determined as a function of the finish rolling temperature and cross-sectional dimension of the flange and web. is expressed by the following two equations, and based on these two equations, the finish rolling temperature for the target residual stress is determined, and the flange and web O temperatures are adjusted so as to reach the scissor finish rolling temperature. This is a method for manufacturing H-beam steel.
ｇ、★ｗｘｂ、−１−ｂ１・ΔＴＴ＠ ＋ｂ、・ΔＴ、
＋ｂｓ・ｊｎ（Ｔ、−Ｔ、）本発明者らの研究による
と、残留応力は７ランジおよびウェブの仕上温度差だけ
で決るものではなく、７ランジおよびウェブの仕上温度
の高低によっても変化する。さらに問題なのは％Ｈ形鋼
Ｏ残留応力が同一仕上温度条件であっても断面寸法が異
なると変化することである。g, ★wxb, -1-b1・ΔTT@ +b,・ΔT,
+bs・jn(T, -T,) According to the research conducted by the present inventors, residual stress is not determined only by the finishing temperature difference between the 7-lunge and the web, but also changes depending on the height of the finishing temperature of the 7-lunge and the web. . A further problem is that the %H section steel O residual stress changes if the cross-sectional dimensions differ even under the same finishing temperature conditions.
通常圧延材においては、断面内で最も大きな残留応力が
存在するのは７ランジ中央とウェブ中央であシ、第２図
に示す如く、フランジは引張応力。In a normally rolled material, the largest residual stress in the cross section is at the center of the 7 flange and the center of the web, and as shown in Figure 2, the flange has tensile stress.
ウェブは圧縮応力となる。したがって、フランジ中央と
ウェブ中央の残留応力を小さくできれば断面全体の残留
応力が下がることになる。The web becomes compressively stressed. Therefore, if the residual stress at the center of the flange and the center of the web can be reduced, the residual stress of the entire cross section will be reduced.
本発明者らの研究により、フランジ中央とウェブ中央の
それぞれの残留応力σ、会、ｃｖ舎 は仕上温度およ
び断面寸法の次のような要因の関数で精度よく表わされ
ることが明らかになった。The research conducted by the present inventors has revealed that the residual stresses σ, σ, and cv at the center of the flange and the center of the web, respectively, can be accurately expressed as a function of the following factors, such as finishing temperature and cross-sectional dimensions.
ここで＃、舎・＃１★：７ランジ中央およびウェブ中央
の残留応力（＃／−）
Ｔ、Ｔ’：フランジおよびウェブＯ仕上ｆ
ｖ
圧延温度 （嶋１）
１、．１．：フランジおよびウェブの厚さく １１ｍ１
）
１１ ＊ ＠ ｗ ：フランジおよびウェブの断面積
（−）
Ｔ Ｔ ：フエライト変態開始および終ム１１
ムｌ
了温度 （℃） −
また、鋼種（化学成分）、Ｈ形鋼のタイプ（広幅。Here, #, #1★: Residual stress (#/-) at the center of the 7 flange and the center of the web T, T': Flange and web O finish f
v Rolling temperature (Shima 1) 1,. 1. : Thickness of flange and web 11m1
) 11 * @ w : Cross-sectional area of flange and web (-) T T : Start and end of ferrite transformation 11
Completion temperature (°C) - Also, steel type (chemical composition), H-beam type (wide width).
中幅、細幅）、断面寸法の大きさく大形、中形。(medium width, narrow width), large cross-sectional dimensions, medium size.
小形）を固定すれば（１）、（２）式はそれぞれ次の（
５）式および（６）式で近似できる。If we fix (small size), equations (1) and (2) become the following (
It can be approximated by equations (5) and (6).
ａ、４＝ａ＊ ＋ａｔ ｅΔＴ、 ＋ａｓ ｅΔＴ、
＋ａｓ ｍｉｎ （Ｔ、−’ｒ、）ｇ、１＝ｂ６ ＋ｂ
、 ｍΔＴ、 ＋ｂｌ ＊△Ｔ、、 ＋ｂ３ ｓｉｎ
（Ｔ、 Ｔ、）ここで”＠ ”−”ｌ 會ｂ１１ Ａ′
ｂｌ 警”１ ＊ ”Ｍ ｅ ｍ１ｍｍ１は定数である
。a, 4=a* +at eΔT, +as eΔT,
+as min (T, -'r,)g, 1=b6 +b
, mΔT, +bl *ΔT,, +b3 sin
(T, T,) here “@ ”-”l meeting b11 A'
bl "1 * "M e m1mm1 is a constant.
上記の（５） 、 （６）式を次のように利用して残留
応力の少ないＨ形鋼を製造する。ｔず製品として耐荷力
の低下、形状不良などの問題を生じない７ランｃ、会
を決めｓ ＃ １４ ＊ ｇ ｗ★がこれ以下になる
ように仕上温度条件を（５） 、 （６）式を使って決
定する。すなわち
ｉ＠ ＋４ｉ ・ΔＴｔ ＋ａｌ ＠ΔＴ、 ＋ａｇ
ｍｉｎ （’Ｉ’、−Ｔ−＋ｂ・＋ｂ１・ΔＴ、＋ｂ、
＠Δ’ｒ、 ＋ｂｓ ＊ｊｙｌ （Ｔｔ ’ｒ−＋圧延
温１ＥＴ、 、’ｒ、になる如く仕上圧嬌前の工程でウ
ェブ保温あるいはフランジ水冷を行えばよい。Using the above equations (5) and (6) as follows, an H-beam steel with low residual stress is manufactured. As a tzu product, 7-run c, which does not cause problems such as a decrease in load-bearing capacity or defective shape,
Determine the finishing temperature conditions using equations (5) and (6) so that s#14*gw★ is less than this. That is, i@+4i ・ΔTt +al @ΔT, +ag
min ('I', -T-+b・+b1・ΔT,+b,
@Δ'r, +bs *jyl (Tt'r-+Rolling temperature 1ET, , 'r) Web insulation or flange water cooling may be performed in the process before finishing compression.
フランジおよびウェブの仕上圧延源［Ｔ、およびＴ は
両者とも常に変更する必要はなく、一方の保温あるいは
水冷処理のみの場合もある。一般にウェブの保温は第３
図に示す如くウェブ２に平行な放熱防止板３によって行
われ、７ランジｌの水冷は第４図に示す如く７ランジ水
冷装置４によって実施される。It is not necessary to always change both the finishing rolling sources [T and T of the flange and web, and there are cases where only one of them is subjected to heat insulation or water cooling treatment. In general, web insulation is the third
As shown in the figure, this is done by a heat radiation prevention plate 3 parallel to the web 2, and the water cooling of the 7-lunge 1 is carried out by a 7-lunge water cooling device 4 as shown in FIG.
実施例
次の如き細幅の大形サイズＨ形鋼を本発明法によ〉製造
した。EXAMPLE A narrow large size H-section steel as shown below was manufactured by the method of the present invention.
鋼 種 ８８ＡｌＪＩ８ Ｇ
３１０１）ウェブ高さ ９００ｍ
フランジ幅 ３００圃
ウェブ厚 １６ｍ＋
７ランジ厚 ２８■
この場合の残留応力の予測式は次の如くである。Steel type 88AlJI8G
3101) Web height: 900 m Flange width: 300 field Web thickness: 16 m + 7 lunge thickness: 28 ■ The residual stress prediction formula in this case is as follows.
σ −−４６１−０，０００５２ΔＴ３ｆ−α０００２
５ΔＴ” ＋ｆ会
ＷＣ１舎■２＆８＋α０５５９ΔＴ、＋α０８５
ΔＴ、−＆９２ｊｎ （Ｔ、−＃：會、ＩＣ二舎１ を
２０ｋｇ／−とし、ウェブ仕上圧延温度を７００℃、７
５０℃、８００℃とした場合のフランジ仕上圧延温度条
件を計算し、結果を第１１！に示した。σ −−461−0,00052ΔT3f−α0002
5ΔT” +f meeting
WC1 building■2&8+α0559ΔT,+α085
ΔT, -&92jn (T, -#: Kai, IC Nisha 1 is 20 kg/-, web finish rolling temperature is 700°C, 7
Calculate the flange finish rolling temperature conditions at 50℃ and 800℃, and summarize the results in the 11th! It was shown to.
第′１表の仕上圧延温度条件になる如く、仕上正弧前の
工程においてウェブの保温あるいは）員ンジの水冷例れ
か少なくとも一方の処理を行い、仕上圧嬌後の製品の残
留応力を測定し、その結果を温度処理を実施しない比較
例として同時に表示した。In order to achieve the finishing rolling temperature conditions shown in Table '1, at least one of the following processes is performed, such as keeping the web warm or cooling the member with water in the process before finishing straight arcing, and measuring the residual stress of the product after finishing rolling. However, the results were also displayed as a comparative example in which no temperature treatment was performed.
［２表よ）明らかな如く本実施例の測定残留応力値は目
標通ｆｉ２０＃／−より軽減しておシ、一方比較例にお
いては２７＃／−も残留している。[Table 2] As is clear, the measured residual stress value of this example was reduced from the target fi 20#/-, while in the comparative example, a value of 27#/- remained.
上記の実施例から４ｈ明らかな如く、製品の残留応力と
仕上圧延温度および断面寸法との関数式を作〉、この式
から必要な仕上圧延温度を求め、仕上正弧工薯前にフラ
ンジおよびウェブの温度を制御することによＬ目標通ヤ
の残留応力の少ないＨ形鋼を製造することができた。As is clear from the above example, a functional formula for the residual stress of the product, finish rolling temperature, and cross-sectional dimension is created, the necessary finish rolling temperature is determined from this formula, and the flange and web are By controlling the temperature, it was possible to manufacture an H-beam steel with low residual stress in the L target thread.
本発明においては残留応力の計算に関数式を利用し九が
、その他にも熱間圧延により製造される特開Ｂ１１１５
８−３４１３０（４）
Ｈ形鋼のウェブ波の発生判定式あるいは鋼矢板の冷却後
の反シ予測式においても、本発明と同様に仕上圧延温度
と断面寸法の関数として表現が可能であって、広く適用
できると考えられる。In the present invention, a functional formula is used to calculate the residual stress.
8-34130 (4) The formula for determining the occurrence of web waves in H-section steel or the formula for predicting the reversal of steel sheet piles after cooling can be expressed as a function of finish rolling temperature and cross-sectional dimension in the same manner as in the present invention. , is considered to be widely applicable.
第１図はＨ形鋼の断面図、第２図はＨ形鋼の残留応力分
布を示す断面図、第３図はウェブの保温状況を示す断面
図、第４図は７ランジの水冷状況を示す断面図である。
ｌ・・・７ランジ ２・・・ウェブ３・・・放熱
防止板 ４・・・７ランジ水冷装置代理人 中
路 武 雄
第１図
引弦り十斤ｍ 丘纏＋引儀す第３図
３
第４図Figure 1 is a cross-sectional view of the H-beam steel, Figure 2 is a cross-sectional view showing the residual stress distribution of the H-shape steel, Figure 3 is a cross-sectional view showing the web heat retention status, and Figure 4 is the water cooling status of the 7-lunge. FIG. l...7 lunge 2...web 3...heat radiation prevention plate 4...7 lunge water cooling device agent medium
Takeo Michi Figure 1 Hikizuru 10 kanm Okamatome + Hikigisu Figure 3 Figure 4
Claims (1)
制御する残留応力の少ないＨ形鋼の製造方法において、
前記Ｈ形鋼の残留応力を前記フランジおよびウェブの仕
上圧延温度および断面寸法の関数とする下記２式で表示
し、この２式より目標とする残留応力に対する仕上圧延
温度を求め咳仕上圧延温度になる如く前記７ランジとウ
ェブの温度を調整することを特徴とする残留応力の少な
いＨ形鋼の製造方法。 ｍ−、ｍ ｂ＠ ＋ｂ１−ΔＴ７ ＋ｂ、 −ΔＴ：”
＋ｂｓ ｅｊｎ （Ｔ、−Ｔ、）＋ここでσ ・
：７ランジ中央およびウェブ中ｆ★ Ｗ会 夫の残留応力（Ｍｙ／−） Ｔ 、Ｔ ： フランジおよびウェブの仕上圧延
温１ 曾 度（℃） ｍｌ−’−ｍ＠ 、ｂ＠２ｂ＠ 、 ｎｈ Ｊ
、ｍｌ 、ｍｌ ： 常数(1) In a method for manufacturing H-section steel with low residual stress, which controls the hot rolling temperature of the flange and web of H-section steel,
The residual stress of the H-section steel is expressed by the following two equations as a function of the finish rolling temperature and cross-sectional dimension of the flange and web, and from these two equations, the finish rolling temperature for the target residual stress is determined and the finish rolling temperature is determined. A method for manufacturing an H-section steel with little residual stress, characterized by adjusting the temperatures of the seven flanges and the web as desired. m-, m b@ +b1-ΔT7 +b, -ΔT:”
+bs ejn (T, -T,)+where σ ・
: 7 Residual stress in the center of the flange and in the web f★ W member (My/-) T, T: Finish rolling temperature of the flange and web 1 degree (℃) ml-'-m@, b@2b@, nh J
, ml, ml: constant
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56131207A JPS5834130A (en) | 1981-08-21 | 1981-08-21 | Production of h-beam having less residual stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56131207A JPS5834130A (en) | 1981-08-21 | 1981-08-21 | Production of h-beam having less residual stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5834130A true JPS5834130A (en) | 1983-02-28 |
| JPH0217241B2 JPH0217241B2 (en) | 1990-04-19 |
Family
ID=15052541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56131207A Granted JPS5834130A (en) | 1981-08-21 | 1981-08-21 | Production of h-beam having less residual stress |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834130A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6228002A (en) * | 1985-07-29 | 1987-02-06 | Kawasaki Steel Corp | Method and apparatus for heating web in rolling of wide flange beam |
| JPS63216923A (en) * | 1987-03-04 | 1988-09-09 | Kawasaki Steel Corp | Manufacture of thin h-shape steel |
| JPS6454506U (en) * | 1987-09-30 | 1989-04-04 | ||
| EP0462783A2 (en) * | 1990-06-21 | 1991-12-27 | Nippon Steel Corporation | Process and apparatus for producing thin-webbed H-beam steel |
| US5259229A (en) * | 1990-06-21 | 1993-11-09 | Nippon Steel Corporation | Apparatus for cooling thin-webbed H-beam steel |
| JP2017144481A (en) * | 2016-02-16 | 2017-08-24 | Ｊｆｅスチール株式会社 | Method for producing linear steel sheet pile and linear steel sheet pile |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5356146A (en) * | 1976-11-01 | 1978-05-22 | Sumitomo Metal Ind | H shape steel sections residual stress decreasing |
-
1981
- 1981-08-21 JP JP56131207A patent/JPS5834130A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5356146A (en) * | 1976-11-01 | 1978-05-22 | Sumitomo Metal Ind | H shape steel sections residual stress decreasing |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6228002A (en) * | 1985-07-29 | 1987-02-06 | Kawasaki Steel Corp | Method and apparatus for heating web in rolling of wide flange beam |
| JPS63216923A (en) * | 1987-03-04 | 1988-09-09 | Kawasaki Steel Corp | Manufacture of thin h-shape steel |
| JPS6454506U (en) * | 1987-09-30 | 1989-04-04 | ||
| EP0462783A2 (en) * | 1990-06-21 | 1991-12-27 | Nippon Steel Corporation | Process and apparatus for producing thin-webbed H-beam steel |
| US5191778A (en) * | 1990-06-21 | 1993-03-09 | Nippon Steel Corporation | Process for producing thin-webbed h-beam steel |
| US5259229A (en) * | 1990-06-21 | 1993-11-09 | Nippon Steel Corporation | Apparatus for cooling thin-webbed H-beam steel |
| JP2017144481A (en) * | 2016-02-16 | 2017-08-24 | Ｊｆｅスチール株式会社 | Method for producing linear steel sheet pile and linear steel sheet pile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0217241B2 (en) | 1990-04-19 |
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