201004723 六、發明說明： 【發明所屬之技術領域】 本發明係關於在造船、橋樑、建築等領域中所使用的τ 型鋼（T-bar)。本發明的T型鋼特別適用為船體構造用 (shipbuilding)材料，其中更適用為T縱肋(longitudinal)材。 【先前技術】 船體構造的補強用型鋼（shape steel bar)，習知以來便有使 鲁 用球緣板材(bulb plate) ’但隨船體的大型化，在截面性能提 升與減輕使用鋼材重量等目的下，大多已使用具有圖9所示 截面形狀的不等邊不等厚角鋼(NAB: unequal leg and thickness angle)。但是’不等邊不等厚角鋼為左右不對稱的截面形狀， 因而用於補強船體時在截面性能上具有方向性，若承受來自 船體外部的水壓等力，在截面内便會發生扭轉力（torsional stress)。所以，為能滿足構造上所要求的性能，便必需使用 ❹具有能承受上述扭轉力之截面性能的型鋼，但因使用截面積 尺寸較大之物，會有導致出現船體重量增加的缺點。 再者’近年新製造的原油油輪，受近年修訂的海洋污染防 止條約規定，而被賦予採用下述(a)、（b)任一項義務：（a)雙 - 層船殼(double hull)構造(double hull type)(船底與船侧形成 •為雙層構造，構成即使因觸礁或碰撞等導致船體破裂，原油 仍不易流出之狀態）；（b)中層水平中隔艘構造(mid-deck typ e)(將原油槽分為上下二層，僅將船侧部分形成雙層構 098120384 3 201004723 ^且刀隔出上下槽的中間甲板配置於吃水線之下方，靠下 側槽的原’由壓力經常保持較周圍的水厪為低，即使因觸石焦等 現開π ’靠下侧槽的原油會因浸人之海水的壓力 被往上擠而形成封鎖於槽内之狀態）。特別在雙層船殼内， 在無載^時’使用為注人海水以使船舶能安定航行的壓擒水 禮。所以’在船底或船壁所配置的縱肋材可能直接浸潰於海 水中’因而施以防銹塗装使其具備充分的耐蝕性，並要求確 保該塗膜的密接性。 近年’將具有如圖10所示τ形截面形狀(型鋼寬度方向上 的截面形狀）、以腹板為中心而呈線對稱橫截面之形狀的τ 縱肋材使用為船體補強用構件。該τ縱肋材廣泛使用以厚 板切斷而熔接組裝所成之物，此種Τ縱肋材（以下有時亦稱 「溶接Τ縱肋材」(welded T_bar))在腹板(web)與翼板(flange) 的接合部設有熔接部。但是，當在該熔接部上塗裝時，因為 熔接焊珠具有凹凸的形狀，因而塗膜厚度會不均勻，成為熔 接後未經其他處理(as_welded)的表面凹凸部分或邊緣部分 遭受選擇性腐蝕的原因，會導致船體構造構件遭受腐蝕劣化 的重大問?4。為防止形成此種瑕疵(imperfecti〇n)塗膜，為使 熔接T縱肋材之炼接焊珠部表面形成平滑狀態，以研磨機 等補修後才塗裝。此種在塗裝前對熔接焊珠部之補修，因為 必須跨越型鋼的長邊方向全長而檢查需要補修之部位而頗 耗人工，再加上因為以研磨機等補修而耗費時間，且亦會因 098120384 4 201004723 人工作業成本增加而導致成本上升。 另一方面，相對於此種熔接τ縱肋材，亦有將以熱軋所 獲得之型鋼利用為T縱肋材’此種T縱肋材，因未施行熔 接T縱肋材等炫接組裝’因而不會有如上述因溶接部所造 成的塗裝問題。在專利文獻1有揭示：將以熱軋成形為Η 型鋼後再將腹板部裁半(2分割）而製得的τ型鋼（以下稱「切 割Τ型鋼」（cut T-bar))，使用為τ縱肋材。此外，在專利文 Φ 獻2、3中有揭示：將以熱軋直接獲得的T型鋼（以下稱「軋 延T型鋼」（rolled T-bar))，使用為τ縱肋材。 專利文獻1 :曰本專利特開2002-301501號公報 專利文獻2 :曰本專利特開平n_3424〇1號公報 專利文獻3 :曰本專利特開2007-331027號公報 【發明内容】 (發明所欲解決之問題） 籲# ’上述f知技術自切割τ型鋼或軋延τ型鋼所形成 的Τ縱肋材，會有如下述問題。 Τ縱肋材大多使用為沿船體長邊方向的長條構件 (longitudinal)。此情況下，將複數條長度i〇〜2〇m左右的τ 縱肋材(T型鋼)在長邊方向上雜接合，而形成長條的船體 •構造材(補強材）。此種τ縱肋材間的熔接接合部，在船體構 造材的性質上’全都要求具有適當強度。然而’使用習知技 術的切割T型鋼或軋延τ型鋼時，會有τ縱肋材間的炫接 098120384 5 201004723 接合部發生龜裂並進展’導致接合部強度降低的問題發生之 了月bf為防止此現象’習知必需採取會大幅降低熔接施工 作業效率的預備作業。 然而’根據本發明者等探討的結果發現，若使軋延τ型 鋼的形狀適當化’便可大幅改善上述預備作業的負擔。 所以’本發明目的在於提供解決此種習知技術問題而可在 仏船、橋樑、建築等領域中使用為構造材等的T型鋼，尤 其在使用為船體構造用τ縱肋材時， T縱肋材間的熔接接合 施工性優異之τ型鋼。 (解決問題之手段） 本發明者等’針對習知將切割T型鋼或軋延T型鋼使用 為τ縱肋材的技術，探討T縱肋材間的熔接接合所發生問 題與其對策，獲得如下述發現。 當在T縱肋材的端部間施行熔接接合時，將突接部斜切 後熔接。此時，為避免因翼板與腹板的轉線交又而造成材 質劣化與熔接缺陷，對接觸到翼板的腹板之一部分施以扇形 缺口（scallop)加工，切出扇形缺口。 圖11所示係T縱肋材(T型鋼)接合部的斜切例。同圖中 T縱肋材端部的侧視圖，右側係τ縱肋材端部的』 視圖’虛線所包圍部分係扇形缺口加上部。另外，如圖所示 =別斜切翼板與腹板喊合部^在此，㈣τ _或札延 么鋼’在其腹板與翼_結合部具錢面呈圓弧狀之填角名 098120384 201004723 (fillet)(在圖11或後述圖1中，依「行」所示圓弧部），而上 述扇形缺口加工必需將填角部除去而使翼板内面成為平 坦。若因除去該填角部後的加工面精加工不足，導致成為具 有凹凸的粗糙加工面時，便可能發生如上述之問題，即因應 力集中或應變集中等，導致熔接接合部發生龜裂並進展，而 有產生接合部強度降低等問題的可能性。 T縱肋材所使用的習知切割T型鋼或軋延τ盤鋼，從如下 述理由’具有截面呈圓弧狀而圓弧半徑（一般稱「填角R」） 在13mm程度以上的填角部。 首先’切割T型鋼因為係將熱軋所獲得之η型鋼（軋延η 型鋼）的腹板部裁半(2分割）而製造，因此具有相當於軋延η 型鋼的填角部。軋延Η型鋼填角部的填角R之尺寸由曰本 工業規格(JIS)規格化，Η型鋼尺寸越大，填角r亦越大。 一般’船體構造用Τ縱肋材之腹板的高度大多達i50mm以 • 上’且腹板高度為翼板寬度2倍以上的尺寸。因為在日本工 業規格(JIS)中，腹板高度3〇〇mm的軋延η型鋼之填角r為 13mm，因此欲從軋延11型鋼獲得腹板高度達15〇111111以上 的T縱肋材時’所使用的切割τ型鋼之填角r便達13mm - 以上。 另一方面’軋延τ型鋼之填角R的尺寸，並未如軋延Η 型鋼般規格化’習知軋延Τ型鋼的製造方法，如同軋延η 型鋼般’不得不成為相當程度的龐然大物。例如製造專利文 098120384 7 201004723 獻3的軋延T型鋼之方法’使用萬能粗輥軋機㈣versal禮) 與萬能精她機，施行τ型_純。軸軋時，應成為τ 型鋼填角相部分’先由萬能粗減機的水平輥(horizontal roll)之輥角落部（翼板側之觀㈣部)軋延再以萬能精親札 機的水平輥之㈣落部（翼板側之輥角落部）成㈣製成圓 弧狀截面。鱗萬能粗_機與萬能精輥軋機的水平輥角落 R(半多數大致相同，該輕角落R因下述理由，並無法縮 得太小。 ⑷右將輥角落R縮小’㈣落部與翼板内面的接觸條件 便趨於嚴苛’二者間會發生祕(seGdng)。所以在翼板内 面會發生苑痕瑕疲，導致無法製造適當品質的製品型鋼。 (b) 輥諸部的輥磨損變大，除隨著持續軋延而導致概角 落R變大之外，亦可能破壞圓弧形狀而導致無法成形為平 滑的單一半徑圓弧。所以，必需頻繁地更換輥，除生產性降 低之外，亦造成製造成本增加。即，難以在低成本下大量生 產製品。 (c) 輥角落R越縮小，輥角落部的溫度越容易上升，因此 會因熱而導致輥材質劣化或損傷。若輥角落部發生龜裂或缺 損等情況時，便不得不更換輥，導致生產性降低。 如上述問題’在軋延次數較多且壓縮率高的萬能粗輥軋機 中特別明顯。所以’為避免水平輥的輥角落尺發生上述(a)〜(c) 的問題，必須具有充分大的尺寸，結果，所製得之軋延τ 098120384 8 201004723 型鋼的填角R尺寸亦會具有相當大的尺寸。 再者，製造專利文獻2所載軋延Τ型鋼之方法，使用設 有上下輥的孔模軋延機(tw〇-roll type mill)施行Τ型鋼的熱 軋。該熱軋中，應成為T型鋼填角部(fillet)的部分藉由上下 輥中構成孔模的特定部位軋延，若該特定輥部位的圓孤半徑 縮小’在翼板内面成為接近垂直角度的上輥中，於該輥部位 的圓弧前端與翼板内面會產生疤痕。所以，翼板内面發生苑 ❿ 痕瑕庇’無法獲得適當品質的製品型鋼。因而，應軋延填角 部的親部位之圓弧半徑，為避免發生上述問題，必須具有充 分大的尺寸，結果，所製得之軋延T型鋼的填角R，其尺寸 亦具有相當的大小。另外，專利文獻2的型鋼具有τ形截 面，但翼板厚度之截面形狀被賦予越靠前端越薄的推拔，專 利文獻2所載型鋼的製造方法，並無法製造翼板整體厚度均 勻的Τ型鋼。 籲再者，上述扇形缺口加工中，填角R(圖u中，填角r以 rl表示)越大’填角部的體積與寬度也越大，在扇形缺口加 工中應除去的體積與應精加工為平坦部分的範圍隨之增201004723 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a T-bar used in the fields of shipbuilding, bridges, construction, and the like. The T-shaped steel of the present invention is particularly suitable for use as a hull shipbuilding material, and more preferably as a T longitudinal rib material. [Prior Art] For the hull structure of the shape steel bar, it has been known that the bulb plate is used, but with the enlargement of the hull, the section performance is improved and the weight of the steel is reduced. For the purpose, most of the unequal leg and thickness angles (NAB: unequal leg and thickness angle) having the cross-sectional shape shown in FIG. 9 have been used. However, 'unequal sides are not equal to the angle shape of the left and right asymmetrical steel. Therefore, when used to reinforce the hull, it has directionality in cross-section performance. If it is subjected to water pressure from the outside of the hull, it will occur in the cross section. Torsional stress. Therefore, in order to satisfy the required performance of the structure, it is necessary to use a profile steel having a cross-sectional property capable of withstanding the above-mentioned torsional force, but the use of a material having a large cross-sectional area may cause a disadvantage of an increase in the weight of the hull. Furthermore, the newly manufactured crude oil tanker in recent years has been granted the following obligations (a) and (b) by the marine pollution prevention treaty as amended in recent years: (a) double-hull hull (double hull) Structure (double hull type) (formed at the bottom of the ship and the side of the ship • It is a two-layer structure, which constitutes a state in which the crude oil is not easily discharged even if the hull is broken due to a reef or collision, etc.); (b) The mid-level horizontal septum structure (mid- Deck typ e) (The crude oil tank is divided into upper and lower layers, only the side part of the ship is formed into a double layer 098120384 3 201004723 ^ and the middle deck of the upper and lower slots is placed below the waterline, and the original side of the lower side groove The pressure is often kept lower than that of the surrounding water rafts, even if the crude oil in the lower side groove due to the touch of the stone is squeezed upward by the pressure of the seawater to be blocked in the tank. Especially in the double-hull hull, when there is no load, the use of water is used to make the ship safe and stable. Therefore, the longitudinal ribs disposed at the bottom of the ship or the ship wall may be directly immersed in the sea water. Therefore, the rust-proof coating is applied to have sufficient corrosion resistance, and the adhesion of the film is required to be ensured. In recent years, a τ vertical rib having a τ-shaped cross-sectional shape (a cross-sectional shape in the width direction of the steel) as shown in Fig. 10 and a shape having a line-symmetric cross section centered on the web is used as a member for hull reinforcement. The τ vertical rib is widely used by cutting and welding a thick plate, and the escapement rib (hereinafter sometimes referred to as "welded T_bar") is on the web. A joint portion with a flange is provided with a welded portion. However, when coating on the welded portion, since the welded bead has a concavo-convex shape, the thickness of the coating film is not uniform, and the surface uneven portion or the edge portion which has not been subjected to other treatment (as_welded) after welding is subjected to selective corrosion. The cause of the hull structural members is subject to corrosion degradation. In order to prevent the formation of such an imperfect film, the surface of the welded bead portion of the welded T longitudinal rib is formed into a smooth state, and is applied after being repaired by a grinder or the like. This kind of repairing of the welded bead part before painting is laborious because it has to cross the entire length of the longitudinal direction of the steel and it is necessary to repair the part to be repaired, and it takes time because it is repaired by a grinder or the like. Due to the increase in labor costs due to 098120384 4 201004723, costs have risen. On the other hand, with respect to such a welded τ longitudinal rib, a steel obtained by hot rolling is also used as a T vertical rib 'such a T vertical rib, and a splicing assembly such as a welded T longitudinal rib is not performed. 'Therefore, there will be no coating problems caused by the joints as described above. Patent Document 1 discloses a τ-shaped steel (hereinafter referred to as "cut T-bar") obtained by forming a Η-shaped steel by hot rolling and then cutting the web portion (two-part). It is a τ vertical rib. Further, it is disclosed in Patent Documents 2 and 3 that a T-shaped steel (hereinafter referred to as "rolled T-bar") which is directly obtained by hot rolling is used as a τ vertical rib. Patent Document 1: JP-A-2002-301501, JP-A-2002-301501, JP-A-Patent No. JP-A-No. Solving the problem) The above-mentioned problem is that the escapement rib formed by cutting the τ-shaped steel or rolling τ-shaped steel has the following problems. The escapement ribs are mostly used as longitudinal members along the long side of the hull. In this case, a plurality of τ vertical ribs (T-shaped steel) having a length i 〇 2 2 m or so are mixed in the longitudinal direction to form a long hull structure material (reinforcing material). Such a fusion joint between the τ longitudinal ribs is required to have an appropriate strength in the nature of the hull structure. However, when cutting a T-shaped steel or rolling a τ-shaped steel using a conventional technique, there is a splicing between the τ longitudinal ribs 098120384 5 201004723 The joint portion is cracked and progresses, and the problem of the joint strength is lowered. In order to prevent this phenomenon, it is necessary to take preparatory work that will greatly reduce the efficiency of welding construction work. However, as a result of investigation by the inventors of the present invention, it has been found that the burden of the preparatory work can be greatly improved by appropriately shaping the shape of the rolled τ-shaped steel. Therefore, the present invention aims to provide a T-shaped steel which can be used as a structural material or the like in the fields of barges, bridges, buildings, etc., in particular, in the case of using τ vertical ribs for hull construction, T A τ-shaped steel excellent in weldability between longitudinal ribs. (Means for Solving the Problems) The inventors of the present invention have studied the problem of the use of the traverse ribs between the T longitudinal ribs and the countermeasures for the conventional use of the T-shaped steel or the rolled T-shaped steel. Find. When the fusion joining is performed between the ends of the T longitudinal ribs, the protruding portions are chamfered and welded. At this time, in order to avoid material deterioration and welding defects due to the transition of the flap and the web, a sector scallop is applied to a portion of the web contacting the flap to cut out the sector gap. Fig. 11 shows an example of a chamfering of a joint portion of a T longitudinal rib (T-beam). In the same figure, a side view of the end portion of the T longitudinal rib, and a portion surrounded by a broken line of the "view" of the end portion of the right side τ is a sector-shaped notch addition portion. In addition, as shown in the figure = do not chamfer the wing and the web to shout the joint part ^ here, (4) τ _ or Zhayan's steel 'in the web and wing _ joint part of the cash surface in the shape of a circular fillet 098120384 201004723 (fillet) (in FIG. 11 or FIG. 1 which will be described later, the circular arc portion is shown by "row"), and the fan-shaped notch processing is necessary to remove the fillet portion and make the inner surface of the flap flat. When the finished surface after the removal of the fillet portion is insufficiently finished to form a rough surface having irregularities, the above problem may occur, that is, cracking occurs in the welded joint due to stress concentration or strain concentration. Progress, there is the possibility of problems such as a decrease in the strength of the joint. The conventionally cut T-shaped steel or rolled-rolled shovel steel used for the T vertical ribs has a rounded corner with an arcuate cross section and a circular arc radius (generally referred to as "filling angle R") of 13 mm or more for the following reasons. unit. First, the 'cut T-shaped steel is manufactured by cutting the half of the web portion (two-section) of the n-type steel (rolled n-type steel) obtained by hot rolling, and therefore has a fillet portion corresponding to the rolled n-type steel. The size of the fillet R of the rolled fillet steel fillet is standardized by the Industrial Standard (JIS). The larger the size of the cast steel, the larger the fill angle r. In general, the height of the web of the escapement rib for the hull structure is as large as i50 mm and the height of the web is twice or more the width of the blade. Because in the Japanese Industrial Standard (JIS), the fill angle r of the rolled n-type steel with a web height of 3〇〇mm is 13mm, so it is desired to obtain T-long ribs with a web height of 15〇111111 or more from the rolled 11 steel. At the time of the 'cutting τ steel used, the fill angle r is 13mm - above. On the other hand, the size of the fillet R of the rolled τ steel is not as standardized as that of the rolled Η steel. The conventional method of manufacturing the rolled Τ steel, like rolling η steel, has to become a considerable monster. . For example, the method of manufacturing the patent 098120384 7 201004723 provides the method of rolling the T-shaped steel 'Using the universal rough rolling mill (4) versal ceremony) and the universal fine machine, the τ type _ pure. When the shaft is rolled, it should be the part of the τ-type steel fillet phase. The roll corner of the horizontal roll (the view of the wing side (fourth)) of the horizontal roll is first rolled and then the level of the master. The (four) drop portion of the roll (the corner portion of the roll on the side of the flap) is formed into an arc-shaped cross section. The horizontal universal roll _ machine and the universal roll corner of the universal fine roll mill R (semi-majority is almost the same, the light corner R can not be shrunk too small for the following reasons. (4) The right roll corner R is reduced '(4) Fall and wing The contact conditions on the inner surface of the plate tend to be harsh. 'There is a secret between the two (seGdng). Therefore, there will be a flaw in the inner surface of the wing, which will result in the inability to manufacture a product of appropriate quality. (b) Rolls of the rollers The wear becomes large, and the corner R becomes larger in addition to the continuous rolling, and the arc shape may be broken, resulting in a single radius arc which cannot be formed into a smooth shape. Therefore, the roller must be frequently replaced, except for the decrease in productivity. In addition, the manufacturing cost is also increased. That is, it is difficult to mass-produce the product at a low cost. (c) The smaller the roll corner R is, the more the temperature at the corner portion of the roll is likely to rise, and the material of the roll is deteriorated or damaged by heat. If there is a crack or a defect in the corner portion of the roller, the roller has to be replaced, resulting in a decrease in productivity. The above problem is particularly noticeable in a universal rough rolling mill having a large number of rolling cycles and a high compression ratio. avoid The above-mentioned problems (a) to (c) of the roll corner of the flat roll must have a sufficiently large size. As a result, the fill angle R of the rolled steel of the rolled steel τ120120384 8 201004723 can also have a considerable size. Further, in the method of producing a rolled steel profiled steel disclosed in Patent Document 2, hot rolling of a Τ-type steel is performed using a tw〇-roll type mill provided with upper and lower rolls. The portion of the fillet of the T-shaped steel is rolled by a specific portion of the upper and lower rolls constituting the hole mold, and if the round radius of the specific roll portion is reduced, the upper surface of the wing plate becomes an upper roll which is close to a vertical angle. The front end of the arc of the roller portion and the inner surface of the wing plate are scarred. Therefore, the inner surface of the wing plate is covered with a smear of smear, and the steel of the appropriate quality cannot be obtained. Therefore, the radius of the arc of the pro-part of the fillet portion should be rolled. In order to avoid the above problem, it is necessary to have a sufficiently large size, and as a result, the fillet R of the rolled T-shaped steel obtained has a size which is also quite large. Further, the steel of Patent Document 2 has a τ-shaped cross section, but the wing Cross-sectional shape of the plate thickness The pusher which is thinner at the front end is provided, and the method of manufacturing the steel according to Patent Document 2 does not produce a Τ-shaped steel having a uniform thickness of the entire flap. Further, in the above-described sector-shaped notch processing, the fillet R (in FIG. The fillet r is denoted by rl.) The larger the volume and the width of the fillet, the larger the volume that should be removed in the scalloping process and the range that should be finished into a flat portion.
加。即，如習知切割T型鋼與軋延T型鋼般具有較大填角R 者因為扇形缺口加工的精加工面積較大因而容易產生精 加讀度*足的部分，此情减為如上料致轉作業效率 降低之問題的肇因。 ” 具體而s ’扇形缺口加工時，利用例如氣體切斷而除去腹 098120384 9 201004723 板與填角部時’一般利用手動作業以研磨機精加工氣體切割 面。所以，精加工面積越大，精加工精度亦容易出現變異， 為充分除去氣體切口所需的作業時間便會拉長，導致熔接作 業的效率大幅降低。此外，以研削機械加工時，因為精加工 的面積較大，亦會增加研削碎片的損耗，導致更換頻度增 加，而降低加工效率。但是，若精加工精度不足，則在熔接 接合後便會因應力集中或應變集中而導致龜裂發生並進 展，造成熔接接合部的強度降低，因而即便溶接作業的效率 會變差，仍必需對加工面施以高精度的精加工。 根據如上述的發現，針對做為τ縱肋材使用的τ型鋼探 討其填角部之最佳形狀、大小，得到以下結論：藉由將截面 圓弧狀填角部的填角R設為10mm以下、8mm以下尤佳， 便不會因扇形切口加工的精加工不良而造成熔接接合部強 度降低’可大幅提升扇形切口加工的作業效率。此外，T縱 肋材亦必需施以彎曲加工以形成沿著船殼之形狀，若填角R 較小，則填角部的截面亦變小，而可提升彎曲加工性，所以’ 在對T縱肋材、彎曲加工時，作業效率亦會提高。 本發明根據此種發現而完成，主旨如下。 (1)一種T型鋼，係腹板高度達i5〇mm以上且不具有炫接 部的T型鋼，其特徵在於：形成在腹板與翼板結合部的填 角部，於型鋼寬度方向的截面形狀，呈與腹板及翼板相接的 圓弧狀，且該圓弧的半徑rl為2〜l〇mm。 098120384 10 201004723 (2) —種T型鋼， 為上述翼板寬度的 (3) —種Τ型鋼， 出Τ型鋼。 在上述⑴的Τ型鋼中，上述腹板的高度 2倍以上。 在上述(1)或(2)的Τ型鋼中，以熱軋加工 尤其最好對素材鋼 Τ型鋼。 片使用萬能輥軋機施以熱軋 ，而加工出 腹 ⑷-種Τ型鋼’在上述⑴〜(3)中 板任-項之”鋼中，翼 圓弧的半後達2咖以上度方向上的截面形狀呈圓弧狀’且 為在上述⑴〜(5)巾任—項之Τ型鋼中，其 為身α體構造用Τ型鋼。 (發明效果） 明的Τ型鋼最佳化形成在腹板與翼板之結合部的填 部之形狀與大小，相較於習知Τ型鋼而縮小其填角R。藉 由本發明，在作為τ縱肋材並熔接接合其端部間時，不會 斤包行之扇化缺口加工的精加工不良，而導致溶接接合部 強度降低，可大幅提升扇形切口加卫的作業效率，且對τ 縱肋材施以彎曲加巧成沿著船殼之·時亦具有提升彎 曲加f生的效果。所以，適用於船體構造用Τ型鋼，尤其 098120384 11 201004723 適用於τ縱肋材。 【實施方式】 圖1所示係本發明Τ型鋼的型鋼寬度方向截面形狀之一 例’ f係翼板’ w係腹板’ fi係腹板w與翼板f的結合部， 即形成在由腹板w與翼板f所構成之角落部的填角部。此 夕卜痒表不尺寸的A係腹板高度、B係翼板寬度、U係腹板 旱又、t2係翼板厚度。另外，rl係填角部的圓弧半徑(型 鋼寬度方向截㈣圓弧半徑），r2係翼板前端内面側的角落 部之圓弧半徑(型趣寬度方向截面的Ϊ弧半徑）13係翼板前 端外面侧的祕部之圓弧半徑（型鋼寬度方向截面的圓弧I 徑）。 本發明的T型鋼係腹板高度A達150mm以上而不具有熔 接部的T型鋼’填角部fi在型鋼寬度方向的截面形狀呈與 腹板W及翼板f相接的圓弧狀，且圓弧半徑rl(以下亦稱「填 角R」）設為2〜l〇mm。 不具有炫接部’即非以厚板熔接組裝而得的溶接T型鋼， 但仍可為將熱軋所得Η型鋼的腹板裁半(2分割）而得之所謂 切割Τ型鋼。但，就生產性、或因追加將腹板裁半的步驟 所造成成本增加之觀點，以藉由熱軋加工所得Τ型鋼即所 謂軋延Τ型鋼為佳。此外，就熔接施工性之觀點’以翼板 厚度除填角部與翼板前端附近之外，全部均呈均勻的Τ型 鋼為佳。 098120384 12 201004723 因為本發明之效果，藉由規定填角R而獲得，因此τ型 鋼的腹板馬度Α與翼板寬度Β係任意。但，使用為船體構 造用構件時，以腹板高度A達翼板寬度B的2倍以上為佳。 腹板高度A與翼板寬度B的組合可選擇如： 250mmx 100mm、300mmx 100mm、300mmx 125mm、 350mmxl25mm、400mmx125mm、500mmxl50mm、 600mmx 150mm、700mmx 150mm、800mmxl50mm 等任意組 〇 合。腹板厚度tl與翼板厚度t2的組合亦是任意。例如可根 據切割T型鋼的板厚（規格化η型鋼的腹板厚度與翼板厚度) 進行選擇’當使用為船體構造用構件時，較佳翼板厚度t2 大於腹板厚度tl。另外，一般腹板高度a為翼板寬度b的 10倍以下。 本發明的T型鋼中，填角部fi的填角R(圓弧半徑η)無關 於腹板高度A與翼板寬度B’均設為2〜l〇mm、設為2〜8mm • 尤佳。如前所述，熔接接合T縱肋材的端部間時，在斜切 突接部之後溶接’但為避免因翼板與腹板的溶接線交叉而造 成材質劣化與熔接缺陷，而對鄰接翼板的腹板與填角部中一 部分施以扇形缺口加工，切出扇形缺口（參照圖U)。若填角 • R超過10mm，填角部的體積與寬度會變為過大，因而在施 . 行該項扇形缺口加工時’為避免導致熔接接合部強度降低等 的精加工不良，會導致包含有精加工步驟的扇形缺口加工作 業效率降低，且在將T縱肋材彎曲加工為沿著船殼之形狀 098120384 13 201004723 時，亦會造成彎曲加工性降低。 表1所示係填角R為13mm〜2mm的T型鋼之填角部截面 積與填角寬。其中，填角截面積指圖11右侧的正視圖或圓 1的卓侧填角部fi(腹板部與翼板部除外）之截面積，當填角 R為零，腹板與翼板形成直角時，填角部截面積便為零。此 外’填角寬指同圖中從單侧填角部fi開始起至包失腹板之 對向側填角部fi的長度。 根據表1可知，相較於填角R為13mm(習知切割τ型鋼 的最小填角R)，若將填角R縮小至1〇mm，填角部截面積 便減少41%’填角寬減少17%。若在扇形缺口加工中應被 除去的填角部截面積與寬度縮小至此種程度，對包括有精加 工步驟之扇形缺口加工作業的效率化，便具有極大效果。 且，若將填角R縮小至8mm，則相較於填角R為13mm， 填角部截面積減少62〇/0、填角寬減少28%，若將填角尺更 加縮小至5mm，同樣的，填角部戴面積減少85〇/〇、填角寬 q 減少44%，可獲得更大的效果。 [表1] 填角R (mm) 填角截面積 (mm2) 截面積比 填角寬％ (mm) 填角寬比 13 36.27 1.000 36 1.000 10 21.46 0.592 30 0.833 8 13.73 0.379 26 0.722 5 Γ 5.37 0.148 20 0 556 2 0.86 0.024 ---^ 14 0.389 *腹板厚度10mm的情況 098120384 14 201004723 另一方面’本發明的τ型鋼如後所述，利用不同於習知 技術手法的製造方法製造’可將填角R形成iOmm以下， 但此種製造方法仍難以將填角R形成為未滿2mm。 通常’利用熱軋製造本發明之T型鋼時，使用萬能粗輥 軋機與萬能精輥軋機，當利用該等萬能輥軋機軋延時，利用 水平輥的輥角落部軋延、成形填角部。所以，若縮小該輥角 落部的輥角落R’便可縮小填角R，如上述專利文獻3所述’ φ 僅單純縮小輥角落R，可能發生(a)輥角落部與翼板内面的换 觸條件趨於嚴苛，因二者間發生的疤痕，導致在翼板内面廣 生疤痕瑕疵，而無法製造適當品質的製品型鋼，輥角瘙 部的輥磨損變大’除隨著持續軋延導致輥角落R變大之外， 亦了犯破壞圓狐形狀而導致無法成形為平滑的單一半授圓 弧等問題，因而習知技術並無法縮小輥㈣r，結果亦無法 形成如本發明般小尺寸的填角R。 癱相騎此’本發明者等#由切萬能_錢與萬能精雜 軋機軋延時，對特定觀部位喷射乳延潤滑油(⑽也㈣等（有 關此k方法今後祥述），即便在使水平概的棍角落r縮 j因此導致填角&的尺寸成為非常小時，仍可在不會發 =上述問題之情況下軋延n即便制此種製造方法， 右水平輥的輥角落R未達2mm’仍無法防止翼板内面發生 =瑕疫JL觀的磨損與損傷較大，導致實質上無法利用熱 、仃T型鋼的量產。所以’本發明的了型鋼便將填声民 098120384 15 201004723 下限設為2mm。 基於以上理由，本發明的T型鋼將填角R的大小設為 2〜10mm。 填角部在型鋼寬度方向上的截面形狀（圖u中右側的戴 面形狀），形成與腹板及翼板相接的圓弧狀。此處所謂「圓 弧狀」不必為嚴格精確的圓弧狀，但不包括在炼接τ型鋼、 或以角落粗糙之水平輥所獲得的軋延τ型鋼、切割τ型鋼 中所見明顯偏離圓弧的情況。最好將從半徑rl圓弧的偏離 收束於rl之±20%範園内者定義為半徑rl的圓弧狀。 本發明的Τ型鋼在圖i中左右填角部fi(腹板二面侧的填 角部）的填角R’最好分別跨越型鋼全長而呈一定。若以熱 軋製造本發明的T型鋼，因為左右填角部fi以萬能輥軋機 的水平輥輥角落部|L延、成形，因而可獲得跨越全長而呈相 同半徑的填角部fi。即’不會有如熔接τ型鋼的接合部般在 長邊方向呈不均勻之形狀’而可獲得均勻的填角部fi，故具 有構件时質管理較為容易的優點。此處，若填角r的變異 在±20%範圍内，則跨越型鋼全長均可視為一定。 再者’本發明的τ型鋼為能確保塗裝的完美(perfecti〇n)， 翼板則端之角落部（翼板前端内面側的角落部與翼板前端外 面側的角落部合計4處角落部），在型鋼寬度方向上的截面 形狀最好呈圓弧狀，且圓弧半徑r2、r3(參照圖1}達2匪以 上。r2、r3的上限並無需特別限制，即使例如達翼板厚度〇 098120384 201004723 的一半，仍不會構成問題。該圓弧亦容許稍微變形。 其次，説明獲得本發明τ型鋼（軋延τ型鋼）的較佳製造方 法。 該製造方法使用萬能粗輥軋機與萬能精輥軋機等，以熱軋 製造τ犁鋼。具體而言，例如將以開胚軋延機(break down mill)等所獲得T型鋼片，依序使用第i萬能粗輥軋機、邊 軋機、第2萬能粗觀軋機、萬能精輥軋機施行軋延，而製得 • τ型鋼。此種使用萬能粗輥軋機與萬能精輥軋機的製造方法 中，以萬能輥軋機的水平輥之輥角落部軋延、成形填角部 fi。 在此’在將萬能粗輥軋機與萬能精輥軋機的水平輥輥角落 R(半徑），設為可成形出欲製造之本發明τ型鋼填角 R(2〜10mm)的尺寸後’於軋延中對萬能粗輥軋機及萬能精輥 軋機朝水平輥的輥角落部’從潤滑油供應裝置喷射出軋延潤 •滑油（熱軋用潤滑油），而潤滑水平輥角落部。此時，若對翼 板内面亦喷射軋延潤滑油，便可更加提升防止疤痕之效果， 並可更進-步有效地防止輥角落部與翼板内面產生症痕。 再者，輥角落R越小㈣落部的溫度越容易上升，導致 ' 輥越容易發生損傷，作為對此項問題的對策，至少在萬能粗 -輥軋機的軋延出口侧配置水平輥角落部專用冷卻水喷:嘴 嘴，從該冷卻水侧喷嘴朝水钱祕部儒出冷卻水，而 強化報角落部的冷卻’藉此可防歧溫度過度上升，以防止 098120384 17 201004723 輥遭受損傷。 利用如上述製造方法，可製得本發明填角R較小的T型 鋼。另外’本發明τ型鋼的製造方法，當然並不僅侷限於 上述製造方法。 - 依如上所述，本發明τ型鋼最適用為船體構造用，尤其 - 使用為T縱肋材’而在橋樑、建築等領域中亦可使用為構 造材等。 [實施例1] 〇 本發明T型鋼（船體構造用T型鋼）截面尺寸之一例，如表 2、表3所示。基準的外形尺寸（參照圖丨），腹板高度a為 3〇〇mm、翼板寬度B為U5mm。此外，腹板厚度tl係 9〜12mm、翼板厚度t2係16〜25mm。 表2所示係内部尺寸(inside dimensi〇n) 一定的製品，其腹 板南度A扣減掉翼板厚度t2後的長度(腹板前端距翼板内面 的長度），與翼板寬度B扣減掉腹板厚度tl後的長度呈一 〇 定’隨腹板厚度tl與翼板厚度t2的變化，腹板高度A與翼 板寬度B會有數毫米的差異。此種内部尺寸一定的製品系 列’藉由在後述圖6所示第2萬能粗輥軋機4中將腹板前端 侧的立輥(vertical r〇U)42b與水平輥41a、41b的間隔設為一 疋之下軋延’即可製造。此外，表3所示係外型尺寸(outside dimension)一定之製品，其腹板高度a與翼板寬度b呈一 定’即使腹板厚度tl與翼板厚度t2有變化，腹板高度A與 098120384 18 201004723 翼板寬度B仍呈一定。此種外型尺寸一定的製品系列，藉 由在後述圖6所示第2萬能粗輥軋機4中，調整腹板前端侧 的立輥42b與水平輥41a、41b的間隔，使被軋延材的腹板 高度呈一定而軋延，即可製造。 另外，表2、表3中各部位的R尺寸，填角部的圓弧半徑 rl(填角R)為8mm、翼板前端内面侧角落部的圓弧半徑r2 為5mm、翼板前端外面側角落部的圓弧半徑r3為3mm。 馨 將表2所示本發明T型鋼的截面特性，與習知不等邊不 等厚角鋼(NAB)相比較’其結果如圖2所示。船體構造中， 型鋼主要為補強厚板而使用，在船體設計時，與型鋼同受應 力作用的厚板部分，亦視為型鋼之一部分。所以，在考慮型 鋼的截面性能時，接合某寬度之板的截面係數極為重要，因 而此處以附有寬610mmx厚15mm之板的截面係數為指標。 所謂「附板截面係數」’指對在T型鋼的翼板外面接合有既 ❹ 定面積之板的截面，計算出通過重心之軸的截面二次矩，再 將該值除以該通過重心之軸距截面最遠處之距離所獲得的 值。 如圖2所示，腹板高度A為300mm、翼板寬度B為125mm 的T型鋼之附板截面係數，可獲得接近於300mmx9Gmm、 350mmxl00mm、400mmxl00mm之不等邊不等厚角鋼的性 能，因此以300mmx 125mm之T型鋼1個系列即可涵蓋 300mmx90mm、350mmx 100mm、400mmx 100mm 之不等邊 098120384 19 201004723 不等厚角鋼等3個系列。 [表2] 系列 """"A B tl t2 rl r2 r3 300 124 9 16 8 5 3 ~7〇3 124 9 19 8 5 3 "Too 125 10 一丨 16 8 5 3 ^03 '"1 一， -125 10 ---一 19 8 5 3 3UUX125 303 126 11 19 8 5 3 306 -~~-- 126 11 --^ 22 8 5 3 306 __ · 一， -127 —11— 12 ---- 22 8 5 3 309 127 12 8 5 3 [表3] 系列 裁面尺寸(mm) A B 1 一 t1 Ή2 rl r2 γ3 300 124 9 ^16 8 5 3 303 124 9 8 5 3 3〇〇 125 10 16 8 5 3 300x125 303 125 10 〆19 8 5 3 303 126 11 19 δ 5 3 306 126 11 22 8 5 3 306 127 12 ^22 8 Γ 5 3 309 127 12 —" 25 —___— 8 5 3 以熱軋製造本發明的T蜇鋼（軋延T塑鋼）之例如下所述 其中，設備構造、軋延機構造、輥•形狀、各尺寸等均僅為_ 例，本發明並不僅侷限於該等。 使用圖3所示軋延設備，從具有厚250mm、寬31 〇mm之 長方形截面的鋼胚，札延出目標尺寸為腹板高度300mm、 翼板寬度100mm、腹板厚度9mm、翼板厚度16111111的τ型 098120384 20 201004723 鋼。將該T型鋼之填角部圓弧半徑ri(填角R)設為8inm。圖 3中’ 1係開胚軋延機、2係第1萬能粗輥軋機、3係邊軋機、 4係第2萬能粗輥軋機、5係萬能精輥軋機、6係中間軋延 步驟。 開胚軋延機1通常為裝設有臭孔模之輥的雙重式軋延機。 圖4所示係第1萬能粗輥軋機2的輥構造。該萬能粗輥軋 機2設有相對向的1對水平輥21a、21b、與相對向的1對 〇 立輥22a、22b，將水平輥21a、21b的輥壓面寬度W1設為 大於腹板w的内部尺寸L(從翼板内面起至相反侧之腹板前 端部的距離）。對水平親21a、2lb侧面賦予傾斜角。 圖5所示係邊齓機3的輥構造示意圖。該邊礼機3具備有 相對向的1對水平輥31a、31b，而各水平輥3la、31b分別 具有大徑輥部33與小徑輥部32。 圖6所示係第2萬能粗輥軋機4的輥構造示意圖。該第2 鲁萬能粗輥軋機4具備有相對向的1對水平輥41a、41b、與 相對向的1對立輥42a、42b，並將水平輥41a、41b的輥面 寬W2設為腹板w内部尺寸L以下（最好未滿）。對水平輥 41a、41b鄰接翼板f的侧面賦予傾斜角。 -圖7所示係萬能精輥軋機5的輥構造示意圖。該萬能精粮 -軋機5具備有：相對向的1對水平輥51a、51b、與相對向 的1對立輥52a、52b。水平輥51a、5讣侧面形成垂直面。 首先，將從加熱爐（未圖示）中搬出的素财鋼片（未圖示）’ 098120384 21 201004723 以開胚軋延機1軋延成截面略呈τ形狀的T型鋼片。該τ 型鋼片之腹板厚度40mm、翼板厚度75mm、腹板高度 375mm、翼板寬度i30mm。 接著’利用由第1萬能粗輥軋機2、邊軋機3、及第2萬 能粗輥軋機4相靠近配置所成的軋延設備列對該τ型鋼片 施行5道往復軋延，而壓縮τ型鋼片的腹板與翼板（中間乾 延步驟6)。 在該中間軋延步驟中，首先，於第1萬能粗輥軋機2中， 如圖4所示，利用水平輥21a、21b跨腹板w之全長而壓縮 其板厚方向’再利用立輥22a與水平輥21a、2lb侧面壓縮 翼板f之板厚方向。接著，於邊軋機3中，如圖5所示，在 水平輕31a、31b的大徑輥部33間誘導腹板w，而利用小徑 輥部32將翼板f端面朝翼板寬度方向壓縮。接著，於第2 萬能粗輥軋機4中，如圖6所示，利用水平輥4u、4ib將 腹板W之大部分朝其板厚方向壓縮，且利用立輥42a與水 平輥41a、41b側面將翼板f朝板厚方向壓縮，更利用立輥 42b將腹板w前端部朝腹板高度方向壓縮，藉此調整腹板之 高度。 將依此藉由中間軋延步驟所獲得的T型鋼，利用萬能精 輥軋機5精軋成騎品尺寸。在該萬能精輥軋機$中如圖 斤丁利用水平輥51a、51b將腹板w全長朝其板厚方向 小幅壓縮’並利用立輥52a與水平輥51a、51b侧面將翼板 098120384 201004723 f的傾斜整形為垂直。plus. That is, as is known, the T-shaped steel and the rolled T-shaped steel have a large fill angle R. Because the finishing area of the scalloped notch processing is large, it is easy to produce a portion with a fine reading degree, and the situation is reduced to the above. The cause of the problem of reduced operational efficiency. Specifically, when the scallop is not processed, the abdomen is removed by, for example, gas cutting. 098120384 9 201004723 When the plate and the fillet are used, the grinding surface is generally processed by a grinder to finish the gas. Therefore, the larger the finishing area, the finer The machining accuracy is also prone to variability, and the working time required to sufficiently remove the gas cuts is lengthened, resulting in a significant decrease in the efficiency of the welding operation. In addition, in the case of grinding machining, the grinding is increased because of the larger area of the finishing. The loss of the chips leads to an increase in the frequency of replacement and a reduction in the processing efficiency. However, if the precision of the finishing is insufficient, cracks may occur and progress due to stress concentration or strain concentration after the fusion bonding, resulting in a decrease in the strength of the welded joint. Therefore, even if the efficiency of the welding operation is deteriorated, it is necessary to apply high-precision finishing to the machined surface. According to the above findings, the optimum shape of the fillet portion is discussed for the τ-shaped steel used as the τ vertical rib. And the size, the following conclusion is obtained: it is preferable to set the fillet angle R of the circular arc-shaped fillet portion to 10 mm or less and 8 mm or less. Therefore, the strength of the welded joint is not reduced due to the poor finishing of the fan-shaped slit machining, which can greatly improve the work efficiency of the sector cut processing. In addition, the T longitudinal rib must also be bent to form a shape along the hull. If the fillet angle R is small, the cross section of the fillet portion is also small, and the bending workability can be improved, so that the work efficiency is also improved in the case of the T longitudinal rib and the bending process. The present invention is based on such findings. And the main purpose is as follows: (1) A T-shaped steel, which is a T-shaped steel having a web height of i5 〇 mm or more and having no splicing portion, and is characterized in that a fillet portion formed at a joint portion between the web and the flap is formed. The cross-sectional shape in the width direction of the section steel is in the shape of an arc which is in contact with the web and the flap, and the radius rl of the arc is 2 to l 〇 mm. 098120384 10 201004723 (2) A kind of T-shaped steel, which is the above-mentioned wing (3) 板 Τ , 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在 在. Especially for the material steel Τ section steel. The sheet is applied with a universal roll mill. Rolling, and processing the abdomen (4)-type bismuth steel 'in the steel of the above-mentioned (1) to (3) slab-item, the cross-sectional shape of the half-wing of the wing arc is in the shape of an arc. Further, in the above-mentioned (1) to (5) towel-type steel, it is a α-shaped steel for the body α structure. (Effect of the Invention) The Τ-shaped steel of the present invention is optimized in the shape and size of the filling portion of the joint portion between the web and the flap, and the fill angle R is reduced as compared with the conventional Τ-shaped steel. According to the present invention, when the τ longitudinal rib is welded and joined between the ends thereof, the finishing of the fanning notch processing is not performed, and the strength of the fusion joint is lowered, and the fan-shaped slit can be greatly enhanced. The work efficiency, and the bending of the τ longitudinal ribs along with the hull of the hull also has the effect of improving the bending and f-generation. Therefore, it is suitable for truss steel for hull construction, especially 098120384 11 201004723 for τ longitudinal ribs. [Embodiment] Fig. 1 shows a cross-sectional shape of a profiled steel in the width direction of a profiled steel of the present invention. The 'f-winged blade' w-shaped web' is a joint portion of the web-shaped web w and the flap f, that is, formed by the belly A fillet portion of the corner portion formed by the plate w and the flap f. The ridge is not the size of the A-line web height, the B-system wing width, the U-series web dryness, and the t2 system wing thickness. In addition, the arc radius of the rl-filled corner portion (the radius of the section in the width direction of the section steel) is the radius of the arc of the corner portion on the inner surface side of the front end of the r2-type flap (the radius of the arc of the section in the width direction) 13-wing The arc radius of the secret part on the outer side of the front end of the plate (the arc I diameter of the section in the width direction of the section). The T-shaped steel portion of the T-shaped steel web having a height A of 150 mm or more and having no welded portion has a cross-sectional shape in the width direction of the steel strip which is in an arc shape in contact with the web W and the flap f, and The arc radius rl (hereinafter also referred to as "fill angle R") is set to 2 to l 〇 mm. There is no spliced portion T, that is, a welded T-shaped steel which is not welded by thick plate welding, but may be a so-called cut Τ-shaped steel obtained by cutting a half (two-division) of the web of the Η-shaped steel obtained by hot rolling. However, in view of the increase in the productivity or the cost of the step of cutting the web half, it is preferable to use the hot-rolled steel obtained by the hot rolling process. Further, from the viewpoint of the weldability, it is preferable to divide the corner portion and the vicinity of the front end of the flap by the thickness of the flap, and it is preferable that all of the strands are uniform. 098120384 12 201004723 Since the effect of the present invention is obtained by specifying the fill angle R, the web of the τ-shaped steel and the width of the flap are arbitrary. However, when a member for hull construction is used, it is preferable that the web height A is twice or more the width B of the blade. The combination of web height A and wing width B can be selected as follows: 250mm x 100mm, 300mm x 100mm, 300mm x 125mm, 350mm x l25mm, 400mm x 125mm, 500mm x l50mm, 600mm x 150mm, 700mm x 150mm, 800mm x l50mm. The combination of the web thickness tl and the flap thickness t2 is also arbitrary. For example, it can be selected according to the thickness of the cut T-shaped steel (the thickness of the web of the normalized n-shaped steel and the thickness of the blade). When the member for the hull structure is used, the thickness t2 of the preferred wing is larger than the thickness tt of the web. Further, the general web height a is 10 times or less the width b of the blade. In the T-shaped steel of the present invention, the fillet angle R (circle radius η) of the fillet portion fi is not set to 2 to 10 mm, and is set to 2 to 8 mm, which is preferably 2 to 8 mm. . As described above, when the ends of the T longitudinal ribs are welded and joined, they are melted after the beveled projections. However, in order to avoid the material deterioration and the fusion defects due to the intersection of the melted wires of the wings and the web, the adjacent A portion of the web of the flap and the corner portion are subjected to a scalloping process, and a fan-shaped notch is cut out (see Fig. U). If the fill angle • R exceeds 10 mm, the volume and width of the fillet will become too large. Therefore, in order to avoid the poor finishing of the weld joint strength, etc. The efficiency of the scalloping process in the finishing step is lowered, and when the T longitudinal rib is bent into the shape of the ship hull 098120384 13 201004723, the bending workability is also lowered. Table 1 shows the cross-sectional area of the fillet portion of the T-shaped steel with a fill angle R of 13 mm to 2 mm and the fillet width. Wherein, the cross-sectional area of the fillet refers to the front view of the right side of FIG. 11 or the cross-sectional area of the corner fillet fi of the circle 1 (excluding the web portion and the flap portion), when the fill angle R is zero, the web and the flap When a right angle is formed, the cross-sectional area of the fillet is zero. Further, the 'corner width' refers to the length from the one-side fillet portion fi to the opposite side fillet portion fi of the package lost web in the figure. According to Table 1, it can be seen that compared with the fill angle R of 13 mm (the minimum fill angle R of the conventional cut τ steel), if the fill angle R is reduced to 1 〇mm, the cross-sectional area of the fillet portion is reduced by 41%. Reduced by 17%. If the cross-sectional area and width of the fillet portion to be removed in the scalloping process are reduced to such an extent, the efficiency of the fan-shaped notch processing including the finishing step is extremely effective. Moreover, if the fill angle R is reduced to 8 mm, the cross-sectional area of the fillet portion is reduced by 62 〇/0 and the fillet width is reduced by 28% compared with the fill angle R. If the fillet is further reduced to 5 mm, the same The wearable area of the fillet is reduced by 85〇/〇, and the fillet width q is reduced by 44% for greater effect. [Table 1] Fillet angle R (mm) Fillet cross-sectional area (mm2) Cross-sectional area is wider than fill angle (mm) Fillet width ratio 13 36.27 1.000 36 1.000 10 21.46 0.592 30 0.833 8 13.73 0.379 26 0.722 5 Γ 5.37 0.148 20 0 556 2 0.86 0.024 ---^ 14 0.389 * The case where the web thickness is 10 mm 098120384 14 201004723 On the other hand, 'the τ-shaped steel of the present invention is manufactured by a manufacturing method different from the conventional technique as described later. The fillet angle R is below iOmm, but it is still difficult to form the fillet R to less than 2 mm in this manufacturing method. In general, when the T-shaped steel of the present invention is produced by hot rolling, a universal rough rolling mill and a universal fine rolling mill are used, and when the rolling speed of the universal rolling mill is used, the corner portion of the horizontal roller is rolled and formed into a corner portion. Therefore, if the roll corner R' of the corner portion of the roll is narrowed, the fill angle R can be narrowed. As described in the above Patent Document 3, φ simply reduces the roll corner R, and (a) the corner portion of the roll and the inner face of the wing may be changed. The contact conditions tend to be harsh, and the scars on the inside of the wing cause widespread keloids on the inside of the wing, and it is impossible to manufacture a product of appropriate quality. The roll wear of the roll corner becomes larger. In addition to the problem that the roll corner R becomes large, the shape of the round fox is destroyed, and the single half-circle arc cannot be formed into a smooth shape. Therefore, the conventional technique cannot reduce the roll (four) r, and as a result, it cannot be formed as small as the present invention. Size fillet R.瘫相骑的'本发明者等# By cutting the versatile _ money and versatile fine rolling mill, delaying the spraying of the squeezing lubricant on the specific part ((10) also (four), etc. (about this k method in the future), even if The horizontal corner of the stick is so narrow that the size of the fillet & is very small, and it can still be rolled without the above problem. Even if this manufacturing method is used, the roll corner R of the right horizontal roll is not Up to 2mm' still can not prevent the occurrence of the inner surface of the wing = the plague JL view wear and damage is large, resulting in the substantial use of heat, 仃T-shaped steel mass production. So 'the steel of the invention will fill the voice 098120384 15 201004723 The lower limit is set to 2 mm. For the above reasons, the T-shaped steel of the present invention has a size of the fillet R of 2 to 10 mm. The cross-sectional shape of the fillet portion in the width direction of the steel (the shape of the wearer on the right side in Fig. u) is formed. The arc shape is connected to the web and the wing. The so-called "arc shape" does not have to be a strictly precise arc shape, but does not include the rolling obtained by refining the τ steel or the horizontal roller with a corner roughness. Significant deviation from the τ steel and the cut τ steel In the case of an arc, it is preferable to define the deviation from the radius rl arc to ±20% of the radius of rl as the arc of the radius rl. The Τ-shaped steel of the present invention is filled with the left and right corners fi in Fig. The fillet R' of the fillet on the two sides of the web is preferably constant across the entire length of the steel. If the T-shaped steel of the present invention is produced by hot rolling, because the left and right fillet portions are the horizontal rolls of the universal roll mill The corner portion|L is extended and formed, so that the fillet portion fi having the same radius across the entire length can be obtained. That is, 'there is no uneven shape in the longitudinal direction as in the joint of the welded τ-shaped steel', and uniformity can be obtained. The fillet portion fi has the advantage that the component quality management is relatively easy. Here, if the variation of the fill angle r is within ±20%, the full length of the spanned steel can be regarded as constant. It is possible to ensure the perfection of the coating, and the corners of the end of the flap (the corners on the inner surface side of the front end of the flap and the corners on the outer side of the front end of the flap) are four corners in the width direction of the steel strip. The cross-sectional shape is preferably arc-shaped, and the arc radius r2, r3 (refer to Figure 1) 2匪以上。 The upper limit of r2 and r3 is not particularly limited, and even if it is half of the blade thickness 〇 098120384 201004723, it does not pose a problem. The arc also allows slight deformation. Next, the τ steel of the present invention is obtained. A preferred manufacturing method of the τ steel. The manufacturing method uses a universal rough rolling mill and a universal fine rolling mill to produce a τ plow steel by hot rolling. Specifically, for example, a break down mill is used. The obtained T-shaped steel sheet was sequentially rolled using the i-th rough rolling mill, the side rolling mill, the second universal rough rolling mill, and the universal fine rolling mill to obtain the τ steel. This type of universal rough rolling mill was used. In the manufacturing method of the universal fine rolling mill, the corner portion of the roll of the horizontal roll of the universal roll mill is rolled and the fillet portion fi is formed. Here, 'the corner R (radius) of the horizontal roll of the universal rough roll mill and the universal fine roll mill is set to the size of the τ-shaped steel fillet R (2 to 10 mm) of the present invention to be manufactured. Yanzhong spurs the rolling edge and the lubricating oil (the lubricating oil for hot rolling) from the lubricating oil supply device to the corner portion of the roller of the universal rough rolling mill and the universal fine rolling mill toward the horizontal roller, and lubricates the corner portion of the horizontal roller. At this time, if the lubricating oil is sprayed on the inner surface of the flap, the effect of preventing the scar can be further enhanced, and the corner portion of the roller and the inner surface of the flap can be prevented from being further scratched. Furthermore, the smaller the roll corner R is, the more easily the temperature of the falling portion rises, which causes the roll to be more susceptible to damage. As a countermeasure against this problem, at least the corner portion of the horizontal roll is disposed on the rolling exit side of the universal rough-rolling mill. Dedicated cooling water spray: the mouth, from the cooling water side nozzle to the water money secrets Confucian cooling water, and strengthen the cooling of the corners of the corners - thereby preventing excessive temperature rise, to prevent damage to the 098120384 17 201004723 roller. With the above production method, the T-shaped steel having a small fill angle R of the present invention can be obtained. Further, the method for producing the τ-shaped steel of the present invention is of course not limited to the above-described production method. - As described above, the τ-shaped steel of the present invention is most suitably used for the hull structure, and in particular, it is used as a T-long rib ‘, and can also be used as a structuring material in the fields of bridges, buildings, and the like. [Example 1] 之一 An example of the cross-sectional dimension of the T-shaped steel (T-shaped steel for hull structure) of the present invention is shown in Table 2 and Table 3. The outer dimensions of the reference (see Figure 丨), the web height a is 3〇〇mm, and the wing width B is U5mm. Further, the web thickness tl is 9 to 12 mm, and the thickness t2 of the blade is 16 to 25 mm. Table 2 shows the internal dimensions (inside dimensi〇n) of a certain product, the length of the web south A minus the thickness of the wing t2 (the length of the front end of the web from the inner surface of the wing), and the width of the wing B The length after the thickness tl of the web is deducted is determined as 'the thickness of the web tl and the thickness t2 of the flap, and the height A of the web and the width B of the flap may differ by several millimeters. In the second product rough roll mill 4 shown in Fig. 6, which will be described later, the distance between the vertical roller 42b on the web front end side and the horizontal rollers 41a and 41b is set to be the same. Rolling down at a glance can be made. In addition, Table 3 shows a product with a certain outer dimension, and the web height a and the width b of the blade are set to 'even if the web thickness tl and the thickness t2 of the blade vary, the web height A and 098120384 18 201004723 Wing width B is still fixed. In the second product rough roll mill 4 shown in FIG. 6 described later, the distance between the vertical rolls 42b on the front end side of the web and the horizontal rolls 41a and 41b is adjusted to obtain a rolled product. The web height is fixed and rolled, and it can be manufactured. In addition, the R dimension of each part in Tables 2 and 3, the arc radius rl (fillet angle R) of the fillet portion is 8 mm, and the arc radius r2 of the inner side corner portion of the front end of the flap is 5 mm, and the outer side of the front end of the flap The arc radius r3 of the corner portion is 3 mm. The cross-sectional characteristics of the T-shaped steel of the present invention shown in Table 2 are compared with conventional unequal-angle thick steel (NAB). The results are shown in Fig. 2. In the hull structure, the section steel is mainly used to reinforce the thick plate. When the hull is designed, the part of the slab that is subjected to the stress with the section steel is also considered as one part of the section steel. Therefore, when considering the cross-sectional properties of steel, it is extremely important to join the section coefficient of a plate of a certain width. Therefore, the section coefficient of a plate having a width of 610 mm x 15 mm is used as an index. The term "attachment section coefficient" refers to a section of a plate to which a predetermined area is joined to the outside of a wing of a T-shaped steel, and the second moment of the section passing through the axis of the center of gravity is calculated, and the value is divided by the center of gravity. The value obtained by the distance from the farthest distance of the wheelbase section. As shown in Fig. 2, the section coefficient of the T-shaped steel with the web height A of 300 mm and the wing width B of 125 mm can obtain the performance of the unequal-width thick angle steel close to 300mmx9Gmm, 350mmx100mm, 400mmx100mm, so One series of 300mm x 125mm T-shaped steel can cover 300mmx90mm, 350mmx 100mm, 400mmx 100mm unequal 098120384 19 201004723 Three series of unequal angle steel. [Table 2] Series """"AB tl t2 rl r2 r3 300 124 9 16 8 5 3 ~7〇3 124 9 19 8 5 3 "Too 125 10 一丨16 8 5 3 ^03 ' "1 one, -125 10 --- one 19 8 5 3 3UUX125 303 126 11 19 8 5 3 306 -~~-- 126 11 --^ 22 8 5 3 306 __ · one, -127 —11— 12 ---- 22 8 5 3 309 127 12 8 5 3 [Table 3] Series face size (mm) AB 1 a t1 Ή2 rl r2 γ3 300 124 9 ^16 8 5 3 303 124 9 8 5 3 3〇〇 125 10 16 8 5 3 300x125 303 125 10 〆19 8 5 3 303 126 11 19 δ 5 3 306 126 11 22 8 5 3 306 127 12 ^22 8 Γ 5 3 309 127 12 —" 25 —___— 8 5 3 The T-rolled steel (rolled T-plastic steel) of the present invention is produced by hot rolling, as described below, wherein the equipment structure, the structure of the rolling mill, the shape of the roll, the size, and the like are only examples, and the present invention is not limited thereto. In these. Using the rolling equipment shown in Fig. 3, from a steel embryo having a rectangular cross section of 250 mm thick and 31 〇 mm in width, the target size is 300 mm in web height, 100 mm in wing width, 9 mm in web thickness, and 16111111 in wing thickness. τ type 098120384 20 201004723 steel. The corner radius ri (fill angle R) of the fillet portion of the T-shaped steel was set to 8 inm. Fig. 3 shows a '1 series open billet rolling mill, a 2 series first rough roll mill, a 3 series side mill, a 4 series second rough roll mill, a 5 series universal fine roll mill, and a 6 series intermediate rolling step. The open billet rolling machine 1 is usually a double calender equipped with a roll of a smear mold. Fig. 4 shows the roller structure of the first universal rough roll mill 2. The universal rough rolling mill 2 is provided with a pair of horizontal rollers 21a and 21b facing each other and a pair of opposing vertical rollers 22a and 22b, and the rolling surface width W1 of the horizontal rollers 21a and 21b is set to be larger than the web w. The internal dimension L (distance from the inner face of the flap to the front end of the web on the opposite side). A tilt angle is given to the horizontal pro 21a and 2lb sides. Fig. 5 is a schematic view showing the structure of the roller of the side squeezing machine 3. The edge machine 3 is provided with a pair of horizontal rollers 31a and 31b facing each other, and each of the horizontal rollers 31a and 31b has a large-diameter roller portion 33 and a small-diameter roller portion 32, respectively. Fig. 6 is a schematic view showing the structure of a roller of the second universal rough rolling mill 4. The second Luneng rough rolling mill 4 is provided with a pair of horizontal rolls 41a and 41b facing each other, and a pair of opposed rolls 42a and 42b, and a roll surface width W2 of the horizontal rolls 41a and 41b is set as a web w. The internal size is below L (preferably not full). The horizontal rollers 41a, 41b are given an inclination angle adjacent to the side surface of the flap f. - Figure 7 is a schematic view showing the structure of the roller of the universal fine rolling mill 5. The universal fine grain-rolling mill 5 is provided with a pair of horizontal rolls 51a and 51b facing each other and a pair of opposed rolls 52a and 52b facing each other. The horizontal rollers 51a and 5b form a vertical surface on the side. First, a plain steel sheet (not shown) 098120384 21 201004723 which is carried out from a heating furnace (not shown) is rolled into a T-shaped steel sheet having a slightly τ-shaped cross section by the bloom rolling mill 1 . The τ-shaped steel sheet has a web thickness of 40 mm, a flap thickness of 75 mm, a web height of 375 mm, and a flap width of i30 mm. Then, the reciprocating rolling of the τ-shaped steel sheet is performed by using the rolling equipment row formed by the first universal rough rolling mill 2, the side rolling mill 3, and the second universal rough rolling mill 4, and the compression τ steel is compressed. The webs and flaps of the sheet (intermediate dry step 6). In the intermediate rolling step, first, in the first universal rough rolling mill 2, as shown in FIG. 4, the horizontal rolls 21a and 21b are used to compress the thickness direction of the web w by the entire length of the web w. The side faces of the horizontal rollers 21a and 2b are compressed in the thickness direction of the flap f. Next, in the edge rolling mill 3, as shown in Fig. 5, the web w is induced between the large-diameter roller portions 33 of the horizontal light portions 31a and 31b, and the end surface of the flap f is directed toward the width of the flap by the small-diameter roller portion 32. compression. Next, in the second universal rough roll mill 4, as shown in Fig. 6, most of the web W is compressed in the thickness direction by the horizontal rolls 4u, 4ib, and the side faces of the vertical rolls 42a and the horizontal rolls 41a, 41b are used. The flap f is compressed in the thickness direction, and the front end portion of the web w is compressed in the web height direction by the vertical roller 42b, thereby adjusting the height of the web. The T-shaped steel obtained by the intermediate rolling step is then finished by the universal fine rolling mill 5 into a ride size. In the universal fine roll mill, the full length of the web w is compressed slightly in the direction of the thickness thereof by the horizontal rolls 51a, 51b and the side plates of the horizontal rolls 51a and 51b are used by the side rollers 098120384 201004723 f Tilt shaping is vertical.
所述連串軋延步驟所使用的萬能粗輥軋機2、4 及萬此精輥祝機5中，就水平輥角落部的輥角落r(半徑）， j。萬i粗輥乾機2、4中設為9mm，萬能精輥減5則 為8mm ’在水平輥角落部的附近設置如圖8a、圖8B 所二潤滑油供應裝置χ，從該潤滑油供應農置X朝水平親 角落部供應軋延潤滑油（熱乾用潤滑油χ1)。圖8Α、圖8Β ❹所不係在第1萬能粗輥軋機2中設置潤滑油供應裝置X的 狀態’圖8Β係正視圖’圖8Α係水平概的侧視圖。因為以 2 口萬月b粗輥軋機2、4施行往復乳延，因而在乾延機前面（上 游侧）與後面（下游侧）分別設置潤滑油供應裝置χ，並從成為 軋延入口侧的潤滑油供應裝置χ喷射出軋延潤滑油，在軋 延潤滑油附著於水平輥角落部上的狀態下軋延。此外，在萬 月b精輕軋機5中，因為僅施行1道軋延，因而潤滑油供應裝 •置X僅設置於軋延機的前面（上游側），如同萬能粗輥軋機 般，在軋延入口側喷射軋延潤滑油，同時軋延。依此一邊供 應軋延潤滑油一邊軋延的結果，輥與翼板内面不會發生疤 痕，翼板内面不會有疤痕瑕疵，可軋延出具有良好表面的製 -品。此外，在經軋延出lOOOton以上的製品後，輥角落部仍 -不會有明顯的磨損’截至最後為止幾乎均可軋延出相同填角 R的製品。熱軋用潤滑油可毫無問題地使用通常熱軋鋼材等 時所使用物質。本例使用大同化學工業製SH-105，可毫無 098120384 23 201004723 問題地軋延出製品。 另一方面，在未供給軋延潤滑油的情況下軋延，則翼板内 面會發生疤痕瑕疵，無法製造出品質完好的製品。 其次，使用圖3所示軋延設備，製造出與上述製造例同尺 寸的T型鋼，即填角部的圓弧半徑H(填角R)為5mm之製 品。 水平輥角落部的輥角落R(半徑），在2台萬能粗親札機設 為6min萬能精輥軋機則設為5mm。如同上述製造例，在 _ 對各萬他㈣機2、4、5的水傾角落部從潤滑油供應裝置 喷射出軋延潤滑油的情況下軋延，結果雖可防止水平親與 翼板内面發生絲’但經軋延出15Gton左右的製品後，因 為2 口萬絲輥軋機2、4的水平輥㈣部出現龜裂，因而 軋延中斷。此龜裂的原因可認為因輥角落部的溫度過度上升 所致’因而對策便是在萬能粗輥軋機2 ' 4鄰接㈣油供應 置處狄置喷射出冷卻水的冷卻水噴射喷嘴，藉 ❹ 、、卻水嘴射嗔嘴朝軋延出口側的水平輥角落部嘴射 、"卩Jc可將水冷接觸到被軋延材後的水平輥角落部。 即相對於水平輥角落部，在軋延入口侧喷射軋延潤滑油， 而在軋延出口侧喷射冷卻水，在此情況下軋延。結果，可確 ⑽即使已軋延出、約1000ton填角部圓訊、半徑rl為5_的製 品，水平輥角落部仍不會發生龜裂。 ' (產業上之可利用性） 098120384 24 201004723 本發明的τ型鋼相較於f_T型鋼，因為填角部呈圓 弧狀且填角R經適當小徑化，因而使用作為τ縱肋材而在 端部間施行雜接合時，不會因扇形缺口加1之精加工不良 而導麟接接合部強度降低，可大幅提升扇形缺口加工的作 業效率。此外，使用本發明的T型鋼，在將Τ縱肋材彎曲 加工成沿著船设之形狀時，亦可提升彎曲加工性。 【圖式簡單說明】 參 圖1為本發明之τ型鋼的截面形狀一例說明圖。 圖2為表2所示本發明T型鋼的附板截面係數(m〇dulus 〇f section with welded plate)與製品單位重量的關係，與習知不 等邊不等厚角鋼相比較的圖。 圖3為供製造本發明之T型鋼的軋延設備一例之說明圖。 圖4為圖3所示軋延設備的第1萬能粗輥軋機之輥構造示 意正視圖。 ® 圖5為圖3所示軋延設備的邊軋機(edgermill)之輥構造示 意正視圖。 圖6為圖3所示軋延設備的第2萬能粗輥軋機之輥構造示 意正視圖。 圖7為圖3所示軋延設備的萬能精輥軋機之輥構造示意JE 視圖。 圖8 A為在圖4所示萬能粗輥軋機的水平輥角落部附近’ 設置潤滑油供應裝置X狀態的水平輥側視圖。 098120384 25 201004723 圖8B為在圖4所示萬能粗輥軋機的水平輥角落部附近， 設置潤滑油供應裝置X之狀態的正視圖。 圖9為不等邊不等厚角鋼的截面形狀一例之說明圖。 圖10為T型鋼的大略截面形狀一例之說明圖。 圖11為對T縱肋材熔接接合其端部間時的斜切之一例， T縱肋材端部的側視圖（左側）與正視圖（右側）。 【主要元件符號說明】 1 開胚軋延機 2 第1萬能粗輥軋機 3 邊軋機 4 第2萬能粗輥軋機 5 萬能精輥軋機 6 中間軋延步驟 21a、21b 水平輥 22a ' 22b 立輥 31a、31b 水平輥 32 小徑輥部 33 大徑輥部 41a、41b 水平輥 42a ' 42b 立輥 51a ' 51b 水平輥 52a > 52b 立親 098120384 26 201004723 A 腹板尚度 B 翼板寬度 f 翼板 fi 填角部 L 腹板的内部尺寸 R 填角 rl 填角部的圓弧半徑 r2 翼板前端内面侧的角落部之圓弧半徑 r3 翼板前端外面側的角落部之圓弧半徑 tl 腹板厚度 t2 翼板厚度 w 腹板 W1 水平輥的輥壓面寬度 W2 水平輥的輥壓面寬度(輥面寬） X 潤滑油供應裝置 xl 熱軋用潤滑油 098120384 27In the universal rough rolling mill 2, 4 and the fine roll turning machine 5 used in the series rolling step, the roll corner r (radius) of the corner portion of the horizontal roll, j. In the case of 10,000 i rough roll dryers 2 and 4, it is set to 9 mm, and the universal fine roll is reduced to 5 by 8 mm. 'In the vicinity of the corner portion of the horizontal roll, the lubricating oil supply device 如图 as shown in Fig. 8a and Fig. 8B is provided, from which the lubricating oil is supplied. Nongfang X supplies rolling lubricant (heat-drying lubricant χ1) to the horizontal pro-corner. Figs. 8A and 8B are not in a state in which the lubricating oil supply device X is disposed in the first rough roll mill 2. Fig. 8 is a front view of the same. Since the reciprocating emulsion is performed by the two-month b-roller rolling mills 2, 4, the lubricating oil supply device χ is provided in front of the dry extension machine (upstream side) and the rear side (downstream side), respectively, and becomes the rolling inlet side. The lubricating oil supply device χ ejects the rolling lubricant and rolls it while the rolling lubricant adheres to the corner portion of the horizontal roller. In addition, in the Wanlun b fine-light rolling mill 5, since only one rolling is performed, the lubricating oil supply and installation X is set only on the front side (upstream side) of the rolling mill, like a universal rough rolling mill, in rolling The inlet side side is rolled and rolled with lubricating oil while rolling. As a result of the rolling of the rolling lubricant, no flaws are formed on the inner surface of the roll and the flap, and there is no keloid on the inner surface of the flap, and the product having a good surface can be rolled and rolled. In addition, after the product of more than 1000 tons is rolled, the corner portion of the roll still has no significant wear. The product of the same fillet R can be rolled up almost until the end. The lubricating oil for hot rolling can use a material which is usually used for hot-rolled steel or the like without any problem. In this case, the SH-105 manufactured by Datong Chemical Industry Co., Ltd. can be used to roll out the product without any problem of 098120384 23 201004723. On the other hand, if rolling is performed without supplying the rolling lubricant, creases may occur on the inner surface of the flap, and a good quality product cannot be produced. Next, using the rolling apparatus shown in Fig. 3, a T-shaped steel having the same size as the above-described manufacturing example, that is, a product having a circular arc radius H (fill angle R) of 5 mm was prepared. The roll corner R (radius) at the corner of the horizontal roll is set to 5 mm in 2 sets of universal roughing machines. As in the above-described manufacturing example, the rolling of the rolling oil is sprayed from the lubricating oil supply device at the water pouring corner portions of the tens of other four (4) machines 2, 4, and 5, and as a result, the horizontal affinity is prevented from the inner surface of the flap. After the occurrence of the filament 'but the product of about 15 Gton was rolled, the rolling was interrupted because the crack occurred in the horizontal roller (four) of the two-wire rolling mills 2 and 4. The reason for this crack is considered to be caused by an excessive rise in the temperature at the corner portion of the roll. Therefore, the countermeasure is to use a cooling water spray nozzle in which the cooling water is sprayed in the vicinity of the (4) oil supply place of the universal rough rolling mill 2'4. However, the nozzle of the water nozzle is sprayed toward the corner of the horizontal roller on the side of the rolling outlet, and the 卩Jc can contact the water to the corner of the horizontal roller after being rolled. That is, the rolling lubricant is sprayed on the rolling inlet side with respect to the corner portion of the horizontal roll, and the cooling water is sprayed on the rolling outlet side, and in this case, rolling is performed. As a result, it was confirmed that (10) even if the product was rolled out, about 1000 ton of the fillet, and the radius rl was 5 mm, the corner portion of the horizontal roll did not crack. '(Industrial Applicability) 098120384 24 201004723 The τ-shaped steel of the present invention is used as the τ vertical rib because the fillet portion has an arc shape and the fill angle R is appropriately reduced in diameter compared to the f_T steel. When miscellaneous joining is performed between the end portions, the strength of the guide joint portion is not lowered due to the poor finishing of the sector notch plus one, and the work efficiency of the sector notch processing can be greatly improved. Further, by using the T-shaped steel of the present invention, when the escapement rib is bent into a shape along the ship, the bending workability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory diagram showing an example of a cross-sectional shape of a τ steel according to the present invention. Fig. 2 is a graph showing the relationship between the coefficient of the slab of the T-shaped steel of the present invention shown in Table 2 and the unit weight of the product, as compared with the conventional unequal thickness angle steel. Fig. 3 is an explanatory view showing an example of a rolling apparatus for producing a T-shaped steel of the present invention. Fig. 4 is a front elevational view showing the roller structure of the first universal rough rolling mill of the rolling apparatus shown in Fig. 3. ® Figure 5 is a front elevational view of the roll structure of the edgermill of the rolling mill shown in Figure 3. Fig. 6 is a front elevational view showing the roller structure of the second universal rough rolling mill of the rolling apparatus shown in Fig. 3. Fig. 7 is a schematic JE view showing the roller structure of the universal fine rolling mill of the rolling apparatus shown in Fig. 3. Fig. 8A is a side view of the horizontal roller in which the state of the lubricating oil supply device X is set in the vicinity of the corner portion of the horizontal roll of the universal rough rolling mill shown in Fig. 4. 098120384 25 201004723 Fig. 8B is a front elevational view showing the state in which the lubricating oil supply device X is disposed in the vicinity of the corner portion of the horizontal roll of the universal rough rolling mill shown in Fig. 4. Fig. 9 is an explanatory view showing an example of a sectional shape of an unequal thickness angle steel. Fig. 10 is an explanatory view showing an example of a roughly sectional shape of a T-shaped steel. Fig. 11 is a side elevational view (left side) and a front view (right side) of the end portion of the T longitudinal rib when the T longitudinal rib is welded and joined between the ends thereof. [Main component symbol description] 1 Open blank rolling machine 2 First universal rough rolling mill 3 Side rolling mill 4 Second universal rough rolling mill 5 Universal fine rolling mill 6 Intermediate rolling step 21a, 21b Horizontal roller 22a ' 22b Vertical roller 31a 31b horizontal roller 32 small diameter roller portion 33 large diameter roller portion 41a, 41b horizontal roller 42a '42b vertical roller 51a ' 51b horizontal roller 52a > 52b vertical pro 098120384 26 201004723 A web sage B wing width f wing Fi fillet L The inner dimension of the web R Fillet rl The radius of the arc of the fillet r2 The radius of the arc of the corner of the inner side of the front end of the flap r3 The radius of the arc of the corner of the outer side of the front end of the flap tl Thickness t2 Wing thickness w Web H1 Horizontal roll width W2 Horizontal roll roll surface width (roller width) X Lubricating oil supply unit xl Hot rolling oil 098120384 27