JPS60200913A - Manufacture of high tensile invert superior in weldability - Google Patents
Manufacture of high tensile invert superior in weldabilityInfo
- Publication number
- JPS60200913A JPS60200913A JP5630284A JP5630284A JPS60200913A JP S60200913 A JPS60200913 A JP S60200913A JP 5630284 A JP5630284 A JP 5630284A JP 5630284 A JP5630284 A JP 5630284A JP S60200913 A JPS60200913 A JP S60200913A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- temperature
- invert
- web
- weldability
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、溶接性の優れたハイテン・インバート（高抗
張力不等辺不等厚山形鋼）を製造する方法に関するもの
である。本出願人は、特公昭４４−２８５７７号公報を
もって、インバートの効率的な製造方法を提供している
が、本発明は上記発明に好適なものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a high tensile invert (high tensile strength scalene angle steel) with excellent weldability. The present applicant has provided an efficient method for manufacturing an invert in Japanese Patent Publication No. 44-28577, and the present invention is suitable for the above-mentioned invention.
（発明の背景）
インバートは、主に造船用材として多用されている構造
用形鋼であるが、近年省エネルギー、省コストをめざし
て、船体等重量の軽量化が図られるにしたがい、インバ
ートのハイテン化が要望されている。(Background of the Invention) Invert is a structural steel section that is mainly used as a material for shipbuilding.In recent years, as efforts have been made to reduce the weight of ship hulls in order to save energy and cost, inverts have become more and more high-strength steel. is requested.
一般に溶接構造用高張力鋼は、第１表に示すＪＩＳ Ｇ
３］、０６ 、ＳＭ ５０Ｂに代表される。その最大元
い値を示すが、現状はＣｅｑ ＝ ０．３７〜ｏ、４２
程度に下げて実生産されている。しかし、溶接性の面か
ら見れば、上記炭素車量は高過ぎる。Generally, high-strength steel for welded structures is JIS G shown in Table 1.
3], 06, and SM 50B. The maximum original value is shown, but currently Ceq = 0.37~o, 42
It is actually produced at a lower level. However, from the viewpoint of weldability, the above carbon content is too high.
その結果、これらの高炭素当侑・の鋼材を用いて、溶接
構造物を構築する場合には、溶接部の低温割れ防止の見
地から、溶接前後工程で鋼材を加熱するか、あるい幻、
特殊な溶接材料を使用しなければならず、これ等が溶接
施工能率を阻害する大きな原因のひとつとなっている。As a result, when constructing welded structures using these high-carbon steel materials, it is necessary to heat the steel materials before and after welding, or to heat
Special welding materials must be used, which is one of the major causes of impeding welding efficiency.
まだインバートは、その断面が曲υ尺状でウェブが薄く
て長く、フランジが厚く短い形状である。The invert has a curved cross section, a thin and long web, and a thick and short flange.
このため圧延中の冷え方が、ウェブが冷えやすく、フラ
ンジが冷えにくい。第２図にその冷え方を例示する。図
中りは、ユニバーサルミル組圧延工程を示す。Therefore, during rolling, the web is easily cooled and the flange is less likely to be cooled. Figure 2 shows an example of how it cools. The middle part of the figure shows the universal mill assembly rolling process.
この例は、仕上圧延前のユニバーサルミル組６（ユニバ
ーザルミル４＋エツージヤー５）のものである。通常圧
延開始から終了までの温度は、１０５０〜ＳＯＯ℃であ
るが、図かられかるように、ウェブの方がかなり冷速か
早い。フランジとウェブの温度差が、］００〜１５０℃
となることも稀ではない。This example is of universal mill set 6 (universal mill 4 + Etsugiar 5) before finish rolling. Normally, the temperature from the start to the end of rolling is 1050 to SOO°C, but as can be seen from the figure, the web cools down much faster. Temperature difference between flange and web is 00~150℃
It is not uncommon for this to happen.
断面における分布は、第３図に例示するように、ウェブ
においては、引張強さＴＳと降伏点ＹＰが高く、伸びＥ
Ｌが低めとなり、フランジにおいては、ウェブと逆の傾
向を示す。As shown in Fig. 3, the distribution in the cross section shows that the web has a high tensile strength TS and a high yield point YP, and a high elongation E.
L becomes lower, and the flange exhibits a tendency opposite to that of the web.
このだめに、規格を満足するフランジの引張強さと、降
伏点を得るべく、化学成分を調整するのが一般的である
が、それによると、フランジはよいが、ウェブの引張り
強さは規格上限となり、伸びが規格下限に近づき易く、
更に１衆素尚量が高目になり、断面内の機械的性質が異
なる。To avoid this, it is common practice to adjust the chemical composition in order to obtain the tensile strength and yield point of the flange that satisfy the standards. Therefore, the elongation tends to approach the lower limit of the specification,
Furthermore, the amount of the primary element becomes higher, and the mechanical properties within the cross section are different.
（従来方法と問題点）
フランジが厚くウェブが薄いインバートに対１〜、仕上
げ圧延機前のローラテーブル上で、フランジの両側に散
水冷却する技術が、峙公昭５１−３１．２２７号公報に
提案されている。(Conventional method and problems) For inverts with thick flanges and thin webs, a technology was proposed in Publication No. 31-31-227 of 1987 to spray water on both sides of the flange on a roller table in front of the finishing rolling mill. has been done.
この方法は、二段孔型圧延機で製造されたインバート（
ロールインバート）の冷却過程における熱歪を防止して
、形状の良い形鋼となし、矯正作業、テーブル移送等の
精整作業に好都合にしたもめｆあ六へ左とる≠Ｓ−どの
方法は嵐１て用ρ止務の７杉鋼の形状を改善したにとど
捷り、この方法のみによって溶接性の優れたノ・イテン
・インバートを製造することはできない。殊に溝形状形
鋼は、フランジを散水冷却しようとすると、ウェブにも
水が乗ってし捷いウェブが冷えやすい。このために従来
好適な方法、装置がなかった。This method uses an invert (
By preventing thermal distortion during the cooling process of roll inverts, the steel can be made into well-shaped sections, making it convenient for straightening work, table transfer, and other finishing work. Even if the shape of the 7-cedar steel used for cutting is improved, it is not possible to manufacture an invert with excellent weldability by this method alone. In particular, when trying to cool the flanges of channel-shaped steel by spraying water, water also gets on the web, which tends to cool the web. For this purpose, there have been no suitable methods or devices.
（発明の目的）
本発明に一１如上の点に鑑み、溶接性の優れたノ・イテ
ン・インバートを効率的にかつ経済的に製造する方法を
提供するものである。(Object of the Invention) In view of the above points, it is an object of the present invention to provide a method for efficiently and economically manufacturing a no-item invert with excellent weldability.
（発明の構成・作用）
／Ｉ【発明者等Ｕ１、インバート断面内の機械的性質を
均−比するとともに、炭素当量を低下させるべく、谷桃
試験を行なって本究明に到達したものであり、その要旨
は、Ｃ；０．０７へ・０．１．５ 、Ｓｉ、 ；０．１
５＝０．３５． Ｍｎ ； ０．９０−］、、３０．
Ｐ＜０．０２５． Ｓ＜０．０２５． Ｓｏｌ、ＡＰ、
；００］Ｏ〜００３５の谷重量係を含有し、残部Ｆｅお
よび不可避（」゛コ不純物よりなり、かつ炭素当量（Ｃ
ｅｑ ＝ Ｃ＋Ｍｎ Ｓｊ Ｎｊ、 Ｏｒ Ｍｏ Ｖ
−＋−−１−−−−１−〜十〜十−） ＜ ０．３６係
の連５ ２４ ４０ ５ ４、 １４
温度が、９００℃以下のときユニバーサルミル糾により
圧延開始するとともに、７５０±４０℃になる甘でに、
」二記ユニバーサルミル組による圧延を終えて溝状形鋼
となし、該溝状形鋼を仕上圧延した後、冷却および矯正
を行ない、次いで該溝状形鋼を縦切断して、２本のイン
バートとなすことを％徴とする。(Structure and operation of the invention) /I [The inventors U1 conducted the Tanimomo test in order to equalize the mechanical properties within the inverted cross section and reduce the carbon equivalent, and arrived at the present investigation. , the gist of which is C; to 0.07・0.1.5 , Si, ;0.1
5=0.35. Mn; 0.90-], 30.
P<0.025. S<0.025. Sol, A.P.
;00]O to 0035, the remainder consists of Fe and unavoidable impurities, and the carbon equivalent (C
eq = C+Mn Sj Nj, Or Mo V -+--1----1-~10-10-) < 0.36 relation 5 24 40 5 4, 14 Universal mill when the temperature is 900°C or less As soon as rolling begins, the temperature reaches 750±40℃,
After finishing the rolling with the universal mill set mentioned above, it is made into a channel shaped steel, and after finish rolling the channel shaped steel, it is cooled and straightened, and then the channel shaped steel is longitudinally cut into two pieces. The percentage sign is that it is inverted.
以下図面とともに本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
捷ず、合金元素含有量について述べると、Ｃは母材強度
を維持するだめの不可欠の元素であるか、多ずぎると溶
接性と靭性を害し、少なすきると旬月強度が不足するの
で、その範囲を０．０７〜０．１．５係とする。Regarding the content of alloying elements, C is an essential element for maintaining the strength of the base metal. The range is 0.07 to 0.1.5.
Ｓｌ は強度向上に有効な元素であるが、多ずぎると溶
接部靭性を低下させるし、少なすぎると母材強度が不足
するので、その範囲を０．１５〜０３５饅とする。Sl is an element effective in improving strength, but if it is too large, it will reduce the toughness of the weld zone, and if it is too small, the strength of the base metal will be insufficient, so the range is set to 0.15 to 0.35.
Ｍｎ は強度ならびに靭性の向上に有効な元素であるが
、過多または過少で、母材及び浴接部の靭性を劣化さぜ
るので、その範囲を０．９０〜１．３０係とした。Although Mn is an effective element for improving strength and toughness, too much or too little deteriorates the toughness of the base metal and the bath welding part, so the range was set to 0.90 to 1.30.
Ｐ、Ｓは不純物として鋼中に不可避的に含有され、強度
、靭性を劣化させるので、可及的少計であることか望丑
しいが、工莱的に比較的容易に調整できる」二限として
、００２５％としたが、０．０１０リードが好寸しく、
炭素当量Ｃｅｑも０．３４以下が望訃しい。P and S are unavoidably contained in steel as impurities and deteriorate strength and toughness, so it is desirable to keep the amount as small as possible, but they can be adjusted relatively easily in terms of engineering. As a result, it was set as 0.025%, but a lead of 0.010 is ideal.
It is also desirable that the carbon equivalent Ceq is 0.34 or less.
ＳｏｌＭは細粒化のためｏ、 ［） ］、 Ｏ−０，０
６０％とした。その他不可避的に含有されるＮｉ 、
Ｏｒ 。SolM is o, [) ], O-0,0 for fine graining.
It was set at 60%. Other unavoidably contained Ni,
Or.
Ｍｏ ＋’ Ｖ は、Ｃｅｑ （０，３６の範囲をこえ
ないように、低減することが必要である。Mo+'V needs to be reduced so as not to exceed the range of Ceq (0.36).
本発明により溶接性の優れた構造用）・イテン・インバ
ートを製造するには、仕上圧延前のユニノ（−サルミル
組６の手前（上流）あるいは前後に、樋を伏せた状態の
溝形状形鋼９，１．０．のフランジ２４を、所定温度に
冷却する装置２２を設置する。According to the present invention, in order to manufacture a structure with excellent weldability, iten, and an invert, a groove-shaped section steel with a gutter laid down before (upstream) or before and after the sal mill set 6 is used before finish rolling. A device 22 is installed to cool the flange 24 of 9, 1.0 to a predetermined temperature.
上記化学成分の連鋳スラブ８を、例えば加熱装置１によ
り適当な温度に加熱後、第１粗圧延機２および第２粗圧
延機３で、相形鋼片９に加工し、次工程に移行する前に
、第１次温度に均整を行なう。After heating the continuous cast slab 8 having the chemical composition described above to an appropriate temperature, for example, by the heating device 1, it is processed into a phase steel slab 9 by the first rough rolling mill 2 and the second rough rolling mill 3, and then transferred to the next step. Before that, the primary temperature is balanced.
通常連鋳スラブの加熱温度と、ｉη形銅片の仕−」二り
温度ｕコ、それぞれ１２８０℃、１．０５０’Ｃ程度で
あるが、第１、第２粗圧延機の能力か大きい場合には、
更に低温度でよい。被圧延材の断面変化は、略第１図（
ｂ） 、 （Ｃ） 、 （ｄ）の順であり、断面寸法の
小さいものは、第１粗圧延機を省略してもよい。Normally, the heating temperature of the continuously cast slab and the finishing temperature of the iη type copper strip are about 1280°C and 1.050'C, respectively, but if the capacity of the first and second rough rolling mills is large. for,
Even lower temperature is sufficient. The cross-sectional changes of the rolled material are roughly shown in Figure 1 (
The order is b), (C), and (d), and the first rough rolling mill may be omitted for those with small cross-sectional dimensions.
さて、造形の主要部を占めるユニバーザルミル組６にお
ける加工要領を第４図（ｂ）に示す。従来の方法におい
ては、既述の如く、ウェブと２ランジの肉厚差に起因す
る冷却速度の差により、第２図に例示したように、薄肉
ウェブは厚肉フランジ部より温度降下が早く々る他に、
ウェブはロール冷却水によっても冷却され、その傾向が
拡大されるので、第３図に例示したように、両者の機械
的性質の差が拡大される。たとえば、フランジ部の機械
的性質を満足させようとすると、鋼材の炭素当量を高く
せざるを得々い。図中ウェブ厚９−１３朋、フランジ厚
１ｊ−１８ｍ、を示す。Now, the processing procedure for the universal mill assembly 6, which occupies the main part of the modeling, is shown in FIG. 4(b). In the conventional method, as mentioned above, due to the difference in cooling rate caused by the difference in wall thickness between the web and the two flanges, the temperature of the thin web decreases faster than that of the thick flange, as illustrated in FIG. In addition to
The web is also cooled by the roll cooling water, and this tendency is magnified, so that the difference in mechanical properties between the two is magnified, as illustrated in FIG. For example, in order to satisfy the mechanical properties of the flange part, it is necessary to increase the carbon equivalent of the steel material. In the figure, the web thickness is 9-13m, and the flange thickness is 1j-18m.
不余明者等は、製造条件を詳ａ１１（観察することによ
り、−上記現象を見出だしだのであり、その解決方法と
して、第１に、断面内の機械的性質の均一（Ｉｓをはか
るべく、被圧延材の圧延温度を、狭幅管理して、低炭素
当世化を実現することに着目した。即ちウェブとフラン
ジの加工条件を、略一致させることにしたのである。Those who are unclear discovered the above phenomenon by observing the manufacturing conditions in detail, and as a solution, first, to measure the uniformity of mechanical properties (Is) within the cross section. We focused on achieving a low-carbon product in today's world by narrowly controlling the rolling temperature of the rolled material.In other words, we decided to make the processing conditions for the web and flange almost the same.
第４ ：％１ （ｂ）に概要を示すように、エアー吹付
は等のウェブ水切り装置２１により、圧延中にウェブ上
面（（乗ったロール冷却水を排除し、ロール接触による
冷却と、輻射放熱以外の冷却原因を除去し、従来法で圧
延した場合に比べて、ウェブ２３の温１焦を高めに推移
させる。図中２５ｕ、エア吹付はノズルである。エア供
給源は図示し々い。4th:%1 As shown in the outline in (b), the web draining device 21, such as air blower, removes the roll cooling water on the top surface of the web during rolling, cools the web by contact with the rolls, and cools the web by radiant heat dissipation. By eliminating other causes of cooling, the temperature of the web 23 is maintained at a higher level than in the case of conventional rolling.In the figure, the air blower 25u is a nozzle.The air supply source is not shown in the figure.
またフランジ２４を、フランジ水冷装置２２により加速
冷却して、従来圧延温度に比べて低目に推移させ、更に
被圧延材の全所面内湿度を正確に管理する。図中２６は
、水噴射ノズルであり、冷却水供給ヘッダー等の水供給
部は図示を省略した。Further, the flange 24 is acceleratedly cooled by the flange water cooling device 22 to keep the rolling temperature lower than the conventional rolling temperature, and furthermore, the in-plane humidity in all parts of the rolled material is accurately controlled. 26 in the figure is a water injection nozzle, and illustration of a water supply section such as a cooling water supply header is omitted.
第５図は本発明の実施１シ１」のウェブとフランジの冷
却推移のグラフであるが、１祈面内温度およびその分布
は、所期の値に管理され、全断面温度が均一化されてい
る。第６図に当該工程の圧延開始温度と、仕上温度の関
係を示す。圧延開始温度が、９００℃より高い場合には
、圧延加工温度が高くなりすぎて、機械的性質の劣化を
伴なうほか、加工温度を、所定値に納めるだめの過大な
冷却設備を要し、実用的でない。FIG. 5 is a graph of the cooling transition of the web and flange in Embodiment 1 of the present invention, and it shows that the in-plane temperature and its distribution are controlled to the desired values, and the entire cross-sectional temperature is made uniform. ing. FIG. 6 shows the relationship between the rolling start temperature and finishing temperature in the process. If the rolling start temperature is higher than 900°C, the rolling temperature will become too high, resulting in deterioration of mechanical properties and requiring excessive cooling equipment to keep the processing temperature within a predetermined value. , impractical.
また第７図に、加工温度と機械的性質の関係を示すよう
に、加工温度が、’７５０＋４０℃以上では、圧延後の
、結晶粒が粗大で、機械的性質が劣化する。７５０〜４
０℃以下では、降伏点が異常に高くなるほかに、伸びの
劣化がはなはだしく不都合である。図中Ｃｅｑ ＝ ０
．３０−０．３４、ウェブＪす９−工３ｉａ、フランジ
厚１４−１８ ｍ、を示す。なお、本工程における加工
量が少なすぎる場合には、当然その効果（細粒化）が減
少するので、総加工量（圧下量）は５０％以上が望捷し
い。Further, as shown in FIG. 7, which shows the relationship between processing temperature and mechanical properties, when the processing temperature is 750+40°C or higher, the crystal grains after rolling become coarse and the mechanical properties deteriorate. 750-4
Below 0°C, the yield point becomes abnormally high and the elongation deteriorates significantly, which is disadvantageous. Ceq = 0 in the figure
．． 30-0.34, web diameter 9-3ia, flange thickness 14-18 m. Note that if the amount of processing in this step is too small, the effect (grain refinement) will naturally decrease, so it is desirable that the total amount of processing (reduction amount) is 50% or more.
（実施例）
第２表に示すＡ−Ｃは、本発明の実施例であり、Ｄ、Ｅ
は本発明によらない従来例である。同様々引張強度を得
るために、Ｄ、Ｅにおいては、Ｍｎを多く使用し、更に
Ｖを加えるなどしているので、炭素当量Ｃｅｑが高い。(Example) A to C shown in Table 2 are examples of the present invention, D, E
is a conventional example that is not based on the present invention. Similarly, in order to obtain tensile strength, in D and E, a large amount of Mn is used and V is further added, so that the carbon equivalent Ceq is high.
これに対する本発明は、炭素当量が低値となっている。In contrast, the carbon equivalent of the present invention is low.
更にユニバーサルミル組における圧延時、吸込み及び最
終温度とも、ウェブとフランジの温度差が小さい。この
ためウェブ、フランジ間に、機械的回置に差がないもの
が得られている。Furthermore, during rolling in the universal mill set, the temperature difference between the web and the flange is small in both suction and final temperatures. Therefore, there is no difference in mechanical rotation between the web and the flange.
なお、本発明は、造船業において需決の多いノ・イテン
・インバートに関して成されたものであるが、縦切り前
の溝状形鋼は、同様々強度を有しており、ハイテン溝形
鋼としての用途に供しうろことは自明である。Note that the present invention was made regarding no-item inverts, which are in high demand in the shipbuilding industry, but the channel steel before vertical cutting has the same strength as high-tensile channel steel. It is obvious that the scales can be used as
（発明の効果）
以上説明したように、本発明によれば浴接性の優れた構
造用ノ・イテン・インバート（通常５０キロ級インバー
トと呼称されている）が効率的に製造でき、その経済的
効果も大きく、産業の発展に多大の貢献をなすものであ
る。(Effects of the Invention) As explained above, according to the present invention, structural inverts (usually referred to as 50 kg class inverts) with excellent bath wetting properties can be efficiently produced, and their cost-effectiveness It also has great economic effects and makes a great contribution to the development of industry.
第１図は、ユニバーサルミル列を有する形嘴圧延工程の
一般例を示すレイアウトと被圧延材の断面変化の説明図
、第２図は、従来法によるで１（（状形うψ１圧延にお
けるウェブとフランジの冷え方を例示したグラフ、第３
図は、第２図に対応する炭素当霜−と機械的諸性質の相
関図、第４図は１本発明の実施態様を説明するだめの概
略図であって、（ａ）は（ｂ）は（ａ）のＸ−Ｘ’ （
Ｙ−Ｙ’ ）に設置する２ランジ水冷装置の縦断面図、
（Ｃ）はユニバーサルミル列におけるユニバーサルミル
とエツジヤ−の圧延状態（孔型例）を示す模式図、第５
図は、本発明におけるウェブとフランジの冷却推移を例
示するグラフ、第６図に２、圧延開始温度と加工温度の
関係の説、四回、第７図は、本発明により製造したイン
バートのウェブとフランジの機械的諸性質と加工温度と
の関係の鋭、四回である。
菓１ 間
（α）
穿２図
□時 間 Ｃ５ｅｃ） □
第３−図
Ｃａｆｆ＝ （、＋ 亨＋ 、Ｓｉ 、 Ｂす’ｔ ”
（４（％）第４図
（（Ｉｔ）
第４図
（ｂ）
第４回
（Ｃ）４Fig. 1 is a layout showing a general example of the form beak rolling process with universal mill rows and an explanatory diagram of cross-sectional changes of the rolled material. Graph illustrating how the flange cools, Part 3
The figure is a correlation diagram between carbon frost and various mechanical properties corresponding to FIG. 2, and FIG. 4 is a schematic diagram for explaining an embodiment of the present invention, in which (a) and (b) is X-X' in (a) (
A longitudinal cross-sectional view of a two-lunge water cooling system installed at Y-Y'),
(C) is a schematic diagram showing the rolling state (example of groove shape) of the universal mill and edger in the universal mill row,
The figures are graphs illustrating the cooling transition of the web and flange in the present invention, Figure 6 shows the relationship between rolling start temperature and processing temperature, and Figure 7 shows the inverted web manufactured by the present invention. and the sharpness of the relationship between the mechanical properties of the flange and the processing temperature, four times. 1 time (α) 2 figure□ time C5ec) □ 3rd figure Caff= (,++,Si,B't''
(4 (%) Figure 4 ((It) Figure 4 (b) 4th (C) 4
Claims (1)
３５゜Ｍｎ； ０．９０−１．３０． ・Ｐ＜０．０２
５゜Ｓ＜０．０２５ 、 ５ｏｌＡＱ、； ０，０１０
−０．０３５の谷重咄φを含有し、残部Ｆｅおよび不可
避的不純Ｎｉ Ｃｒ Ｍｏ Ｖ 十π＋７＋７４−π）（０，３６係の連続柘造スラブか
ら得だ熱相形鋼片を、その全断面温度が、９００℃以下
のときユニバーザル組により圧延開始するとともに、７
５０±４０℃になるまでに、上記ユニバーサルミル組に
よる圧延を終えて溝状形鋼となし、該溝状形鋼を仕上圧
延した後、冷却および矯正を行ない、次いで該溝状形鋼
を縦切断して、２本のインバートとなすことを特徴とす
る浴接性の優れたハイテン・インバートの製造方法。[Claims] C; 0.07 to 0.15. Si; 0.15-0.
35°Mn; 0.90-1.30.・P<0.02
5°S<0.025, 5olAQ,; 0,010
A hot-phase steel slab obtained from a continuous steel slab of -0.035, with the remainder Fe and unavoidable impurity Ni Cr Mo V 1π + 7 + 74 - π) When the temperature is below 900°C, rolling is started by the universal set, and 7
By the time the temperature reaches 50±40°C, the rolling with the above universal mill assembly is finished to form a channel section, and after the channel section is finish rolled, it is cooled and straightened, and then the channel section is longitudinally rolled. A method for producing a high tensile strength invert having excellent bath contact properties, which comprises cutting the invert into two inverts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5630284A JPS60200913A (en) | 1984-03-26 | 1984-03-26 | Manufacture of high tensile invert superior in weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5630284A JPS60200913A (en) | 1984-03-26 | 1984-03-26 | Manufacture of high tensile invert superior in weldability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60200913A true JPS60200913A (en) | 1985-10-11 |
| JPH0525924B2 JPH0525924B2 (en) | 1993-04-14 |
Family
ID=13023329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5630284A Granted JPS60200913A (en) | 1984-03-26 | 1984-03-26 | Manufacture of high tensile invert superior in weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60200913A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06122922A (en) * | 1992-10-12 | 1994-05-06 | Nippon Steel Corp | Production of wide-flange shape steel excellent in toughness |
| WO2001081642A1 (en) * | 2000-04-24 | 2001-11-01 | Kawasaki Steel Corporation | Linear shape steel excellent in joint fatigue characteristics and production method therefor |
| JP2008254063A (en) * | 2007-04-09 | 2008-10-23 | Sumitomo Metal Ind Ltd | Hot rolled t-shaped steel |
| JP2011508673A (en) * | 2007-12-29 | 2011-03-17 | ライウー スティール グループ カンパニー リミテッド | Shaped steel for magnetic levitation railway track and rolling method thereof |
| CN113789475A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for producing low-alloy hot-rolled steel strip with yield strength of 355MPa at low cost |
-
1984
- 1984-03-26 JP JP5630284A patent/JPS60200913A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06122922A (en) * | 1992-10-12 | 1994-05-06 | Nippon Steel Corp | Production of wide-flange shape steel excellent in toughness |
| WO2001081642A1 (en) * | 2000-04-24 | 2001-11-01 | Kawasaki Steel Corporation | Linear shape steel excellent in joint fatigue characteristics and production method therefor |
| US6706125B2 (en) | 2000-04-24 | 2004-03-16 | Jfe Steel Corporation | Linear shape steel excellent in joint fatigue characteristics and production method therefor |
| JP2008254063A (en) * | 2007-04-09 | 2008-10-23 | Sumitomo Metal Ind Ltd | Hot rolled t-shaped steel |
| JP2011508673A (en) * | 2007-12-29 | 2011-03-17 | ライウー スティール グループ カンパニー リミテッド | Shaped steel for magnetic levitation railway track and rolling method thereof |
| CN113789475A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for producing low-alloy hot-rolled steel strip with yield strength of 355MPa at low cost |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525924B2 (en) | 1993-04-14 |
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