JP2005288469A - Joined steel strip, and steel strip joining method - Google Patents
Joined steel strip, and steel strip joining method Download PDFInfo
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- JP2005288469A JP2005288469A JP2004106088A JP2004106088A JP2005288469A JP 2005288469 A JP2005288469 A JP 2005288469A JP 2004106088 A JP2004106088 A JP 2004106088A JP 2004106088 A JP2004106088 A JP 2004106088A JP 2005288469 A JP2005288469 A JP 2005288469A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 140
- 239000010959 steel Substances 0.000 title claims abstract description 140
- 238000005304 joining Methods 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 24
- 238000003466 welding Methods 0.000 claims abstract description 23
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005554 pickling Methods 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 239000004519 grease Substances 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 46
- 239000003925 fat Substances 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 7
- 210000001503 joint Anatomy 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 235000014593 oils and fats Nutrition 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
Description
本発明は、連続酸洗処理ラインにおいて先行する鋼帯（以下、先行鋼帯と称する）の後端部と、先行鋼帯に後続する鋼帯（後続鋼帯と称する）の先端部とを突き合わせて接合することによって製造される接合鋼帯及び鋼帯接合方法に関する。 The present invention butt-matches a rear end portion of a steel strip (hereinafter referred to as a preceding steel strip) in a continuous pickling treatment line and a front end portion of a steel strip (referred to as a subsequent steel strip) following the preceding steel strip. The present invention relates to a steel strip and a steel strip joining method manufactured by joining together.
従来、特に厚物の鋼帯の連続酸洗処理ラインにおいては、ライン内で個々の鋼帯を接合するために、ライン入側からライン内で先行鋼帯の後端部と後続鋼帯の先端部とを突き合わせて接合することが行われている。
接合方法としては、突き合わせ溶接法のうち、特にフラッシュバット溶接法が一般的に用いられるが、他の接合方法が用いられる場合もある。
一方、鋼帯は一般に炭素量（以下、Ｃ量と称する）が低いものを軟鋼、高いものを特殊鋼と称し区別しているが、Ｃ量の高い特殊鋼は軟鋼に比して溶接が難しく、軟鋼で形成された張り板を特殊鋼鋼帯の間に介在させ、特殊鋼鋼帯同士を直接的に溶接しない接合方法が用いられてきた。
Conventionally, in continuous pickling processing lines for thick steel strips, in order to join individual steel strips within the line, the rear end of the preceding steel strip and the tip of the subsequent steel strip within the line from the line entry side. It has been performed to abut the part.
Of the butt welding methods, the flash butt welding method is generally used as the joining method, but other joining methods may be used.
On the other hand, steel strips are generally distinguished by having low carbon content (hereinafter referred to as C content) as mild steel and high carbon steel as special steel, but special steel with high C content is difficult to weld compared to mild steel, A joining method in which a tension plate made of mild steel is interposed between special steel strips and the special steel strips are not directly welded to each other has been used.
また、自動車をはじめ、特殊鋼が使用される様々な分野において、更なる軽量化、長寿命化の観点から、より高強度の特殊鋼鋼帯の供給を要請されており、それによって強化合金元素を更に多量に含んだ特殊鋼鋼帯を安定的に製造、供給することが求められている。しかしながら従来の軟鋼で形成された張り板を介在させ特殊鋼鋼帯同士を直接溶接しない方法では接合力に限界が有り、一部の特殊鋼鋼帯、特にＳｉ（シリコン）を多量に含みかつ、鋼帯板厚が４．５０ｍｍを超えるものではライン通板時に接合部が破断し、長時間のライン停止による生産性低下、製品に充当するのが困難な鋼帯の発生を余儀なくされていた。 In various fields where special steel is used, including automobiles, the supply of higher-strength special steel strips has been requested from the viewpoint of further weight reduction and longer life. There is a need to stably manufacture and supply a special steel strip containing a larger amount of. However, there is a limit to the joining force in the method in which the special steel strips are not directly welded with a conventional tension plate made of mild steel, and some special steel strips, particularly containing a large amount of Si (silicon), When the thickness of the steel strip exceeds 4.50 mm, the joint portion is broken when the line is passed through, and it is forced to generate a steel strip that is difficult to apply to the product because of a decrease in productivity due to long-term line stoppage.
このため、Ｓｉを多量に含み、かつ、鋼帯板厚が４．５０ｍｍを超える特殊鋼鋼帯の接合面に強靭な接合力を与え、安定した製造を行うことが可能となる接合技術の確立が必要である。 For this reason, the establishment of a joining technique that enables stable production by applying a strong joining force to the joining surface of a special steel strip containing a large amount of Si and having a steel strip thickness exceeding 4.50 mm. is required.
鋼帯の端部接合に常用されるフラッシュバット溶接は、通常大気中で行われる為、高温となる鋼帯端面は常に酸化の危険に曝されている。特にＳｉ、Ｍｎ（マンガン）、Ｖ（バナジウム）等の強化合金元素は酸素と結合しやすく、これらを含む鋼帯をフラッシュバット溶接した際、接合端面にこれら強化合金元素の酸化物が生成しやすく、これが端面に残留して溶接接合部の強度が低下し通板や圧延時に破断が生じ易い。 Since flash butt welding, which is usually used for joining the end portions of steel strips, is usually performed in the atmosphere, the end surfaces of steel strips that are at high temperatures are always exposed to oxidation. In particular, strengthened alloy elements such as Si, Mn (manganese), and V (vanadium) are easily bonded to oxygen, and when a steel strip containing these is flash-butt welded, oxides of these strengthened alloy elements are likely to be formed on the joint end face. This remains on the end face and the strength of the welded joint is lowered, and breakage is likely to occur during threading and rolling.
そこで、特許文献１に開示されているように、溶接接合部の品質、信頼性を向上させる為に、連続フラッシングやアップセット電流による酸化物の溶融・分断・微細化する方法や、ガスシールドなどにより酸化物の残留を極小にする方法が採られている。また、特許文献２では、強化合金元素を多量に含む軟鋼に対して動粘度５〜１００ｃｓｔ（センチストークス）の低動粘度油脂を接合部端面に供給する方法が開示されている。 Therefore, as disclosed in Patent Document 1, in order to improve the quality and reliability of the welded joint, a method of melting, dividing, and refining oxides by continuous flushing or upset current, a gas shield, etc. Thus, a method of minimizing oxide residue is employed. Patent Document 2 discloses a method of supplying a low kinematic viscosity oil and fat having a kinematic viscosity of 5 to 100 cst (centistokes) to a joint end face with respect to mild steel containing a large amount of strengthening alloy elements.
しかしながら、連続フラッシングやアップセット電流による酸化物除去方法では、特殊鋼鋼帯を接合する場合、溶接条件を厳しく管理する必要があるため操業上に難が有り、酸化物の生成の抑制効果も十分とは言えない。またガスシールドによる酸化物除去方法では、設備コストが大きく、ランニングコストも高い。更に低動粘度油脂を接合部端面に供給する方法では、確かに簡単な設備で行うことが可能であるが、低動粘度であるために油脂そのもののシールド効果を期待し難く、軟鋼より溶接が困難な特殊鋼においては十分な効果を得られないという課題がある。 However, in the method of removing oxides by continuous flushing or upset current, it is necessary to strictly control the welding conditions when joining special steel strips. It can not be said. In addition, the oxide removal method using the gas shield has a high equipment cost and a high running cost. Furthermore, the method of supplying low kinematic viscosity oil and fat to the joint end face can certainly be performed with simple equipment, but because of the low kinematic viscosity, it is difficult to expect the shielding effect of the oil itself, and welding is easier than mild steel. There is a problem that sufficient effects cannot be obtained in difficult special steel.
本発明は上述のような課題を解決するためになされたもので、簡単な設備によって、接合が困難な特殊鋼であっても、確実に信頼性の高い溶接により接合された接合鋼帯及び鋼帯接合方法を提供するものである。 The present invention has been made in order to solve the above-described problems, and even with special steels that are difficult to join, even with special equipment, it is possible to reliably join the steel strips and steels joined by reliable welding. A band joining method is provided.
本発明の接合鋼帯は、連続酸洗処理装置内で先行鋼帯の後端部と後続鋼帯の先端部とを溶接することにより得られる接合鋼帯であって、先行鋼帯または後続鋼帯の少なくとも一方が、１．５０重量％以上のシリコン濃度と、４．５０ｍｍ以上の板厚とを有しており、前記先行鋼帯の後端部と前記後続鋼帯の先端部とは油脂を塗布した上で溶接されている。 The joining steel strip of the present invention is a joining steel strip obtained by welding a rear end portion of a preceding steel strip and a leading end portion of a succeeding steel strip in a continuous pickling treatment apparatus. At least one of the bands has a silicon concentration of 1.50% by weight or more and a plate thickness of 4.50 mm or more, and the rear end of the preceding steel band and the front end of the subsequent steel band are made of oil and fat. It is welded after applying.
本発明の鋼帯接合方法は、連続酸洗処理装置内で先行鋼帯の後端部と後続鋼帯の先端部とを溶接して接合鋼帯を製造する方法であって、先行鋼帯または後続鋼帯の少なくとも一方が、１．５０重量％以上のシリコン濃度と、４．５０ｍｍ以上の板厚とを有しており、前記先行鋼帯の後端部と前記後続鋼帯の先端部とを油脂を塗布した上で溶接する。 The steel strip joining method of the present invention is a method of manufacturing a joined steel strip by welding the rear end of the preceding steel strip and the front end of the subsequent steel strip in a continuous pickling treatment apparatus, At least one of the subsequent steel strips has a silicon concentration of 1.50% by weight or more and a plate thickness of 4.50 mm or more, and a rear end portion of the preceding steel strip and a front end portion of the subsequent steel strip, After applying oil and fat, it is welded.
また、前記油脂を塗布する範囲は、先行鋼帯の後端部及び後続鋼帯の先端部から１００ｍｍ以内の表裏両面であって、この油脂の塗布量は、５００ｇ／ｍ２以上２０００ｇ／ｍ２以下であり、更に、前記油脂の４０℃における動粘度は１００ｃｓｔより高く２５０ｃｓｔ以下である。 Moreover, the range of applying the oil is the rear end of the preceding steel strip and the leading end of a succeeding steel strip a both sides within 100 mm, coating amount of the oil is 500 g / m 2 or more 2000 g / m 2 Further, the kinematic viscosity at 40 ° C. of the oil / fat is higher than 100 cst and lower than 250 cst.
本発明の接合鋼帯は、連続酸洗処理装置内で先行鋼帯の後端部と後続鋼帯の先端部とを溶接することにより得られる接合鋼帯であって、先行鋼帯または後続鋼帯の少なくとも一方が、１．５０重量％以上のシリコン濃度と、４．５０ｍｍ以上の板厚とを有しており、前記先行鋼帯の後端部と前記後続鋼帯の先端部とは油脂を塗布した上で溶接されているので、接合部の接合力が非常に高い。 The joining steel strip of the present invention is a joining steel strip obtained by welding a rear end portion of a preceding steel strip and a leading end portion of a succeeding steel strip in a continuous pickling treatment apparatus. At least one of the bands has a silicon concentration of 1.50% by weight or more and a plate thickness of 4.50 mm or more, and the rear end of the preceding steel band and the front end of the subsequent steel band are made of oil and fat. Since it is welded after coating, the joint strength of the joint is very high.
本発明の鋼帯接合方法は、連続酸洗処理装置内で先行鋼帯の後端部と後続鋼帯の先端部とを溶接して接合鋼帯を製造する方法であって、先行鋼帯または後続鋼帯の少なくとも一方が、１．５０重量％以上のシリコン濃度と、４．５０ｍｍ以上の板厚とを有しており、前記先行鋼帯の後端部と前記後続鋼帯の先端部とを油脂を塗布した上で溶接するので、接合の際、油脂被膜によるシールド効果により接合部端面への酸素供給が遮断される。また接合中は、油脂は高温に曝され燃焼するが、これにより接合部周囲の酸素が奪われると共に、ＣＯ２ガス、ＮＯ２ガスなどの非酸化性ガスが発生し、接合部がガスシールドされる為、酸化され易いＳｉ、Ｍｎ、Ｖ等を多量に含む鋼帯を接合する場合であっても、突き合わせ接合部界面において酸化物の生成が抑制され酸化物がほとんど残留しない高品質の接合部が形成された接合鋼帯を製造することができる。 The steel strip joining method of the present invention is a method of manufacturing a joined steel strip by welding the rear end of the preceding steel strip and the front end of the subsequent steel strip in a continuous pickling treatment apparatus, At least one of the subsequent steel strips has a silicon concentration of 1.50% by weight or more and a plate thickness of 4.50 mm or more, and a rear end portion of the preceding steel strip and a front end portion of the subsequent steel strip, Since the oil is coated with oil and welded, the oxygen supply to the end face of the joint is interrupted by the shielding effect of the oil film during bonding. During joining, fats and oils are exposed to high temperatures and burn, but this causes oxygen around the joint to be taken away, and non-oxidizing gases such as CO 2 gas and NO 2 gas are generated, and the joint is gas shielded. Therefore, even when joining steel strips that contain a large amount of Si, Mn, V, etc., which are easily oxidized, high-quality joints in which oxide formation is suppressed and almost no oxide remains at the butt joint interface It is possible to manufacture a bonded steel strip in which is formed.
また、前記油脂を塗布する範囲は、先行鋼帯の後端部及び後続鋼帯の先端部から１００ｍｍ以内の表裏両面であって、この油脂の塗布量は、５００ｇ／ｍ２以上２０００ｇ／ｍ２以下であり、更に、前記油脂の４０℃における動粘度は１００ｃｓｔより高く２５０ｃｓｔ以下である。１００ｍｍより外側に塗布するとフラッシュバット溶接機が鋼帯に電圧を掛ける為の電極に油脂が付着し、電極と鋼帯間でショートする可能性がある。更に鋼帯先尾端から１００ｍｍを超える位置は接合時の発熱の影響範囲外であること、接合端面から十分離れている為、接合部シールド効果は期待できない。また油脂の塗布量が５００ｇ／ｍ２未満では、油脂被膜厚及びガス発生量が不足し、接合部のガスシールドが不十分になる。一方２０００ｇ／ｍ２を超えると、不完全燃焼になり易く、その時に発生する炭素などの不純物が接合部界面に巻き込まれ易くなり、接合部の健全性が劣化する傾向が生じる。さらに、４０℃における動粘度が１００ｃｓｔ以下では油脂が塗布面から流出し易くなり、滞留油脂量が減少し、油脂被膜厚の減少及び燃焼ガスの発生が不十分となり易い。また、動粘度が２５０ｃｓｔより高くなると、鋼帯端面に塗布した際に油脂の均一塗布が困難となり、シールド効果の度合いを決定する油脂被膜の厚み及び燃焼ガスの発生量にムラが生じ易くなる。 Moreover, the range of applying the oil is the rear end of the preceding steel strip and the leading end of a succeeding steel strip a both sides within 100 mm, coating amount of the oil is 500 g / m 2 or more 2000 g / m 2 Further, the kinematic viscosity at 40 ° C. of the oil / fat is higher than 100 cst and lower than 250 cst. If it is applied to the outside of 100 mm, oil and fat may adhere to the electrode for the flash butt welder to apply a voltage to the steel strip, and there is a possibility of short-circuiting between the electrode and the steel strip. Furthermore, since the position exceeding 100 mm from the leading end of the steel strip is outside the range of influence of heat generation at the time of joining and is sufficiently separated from the joining end face, the joint shielding effect cannot be expected. On the other hand, if the coating amount of oil is less than 500 g / m 2 , the oil film thickness and gas generation amount are insufficient, and the gas shield at the joint becomes insufficient. On the other hand, if it exceeds 2000 g / m 2 , incomplete combustion is likely to occur, and impurities such as carbon that are generated at that time tend to be entrapped at the interface of the joint, and the soundness of the joint tends to deteriorate. Furthermore, when the kinematic viscosity at 40 ° C. is 100 cst or less, the oil and fat easily flows out from the coated surface, the amount of staying oil and fat is reduced, and the reduction in the oil film thickness and the generation of combustion gas tend to be insufficient. Further, when the kinematic viscosity is higher than 250 cst, it becomes difficult to uniformly apply the oil and fat when applied to the end surface of the steel strip, and the thickness of the oil and oil film that determines the degree of the shielding effect and the generation amount of the combustion gas tend to be uneven.
図１は、本発明の鋼帯を接合する際の構成を概略的に示す構成図である。
特に図１（ａ）は接合前の状態を示し、図１（ｂ）は接合後の状態を示す。
表１は、先行鋼帯の後端部と後続鋼帯の先端部とをフラッシュバット溶接法により接合する場合の各鋼帯の組成及び組合せを表す表である。
表２は、フラッシュバット溶接を行う際の塗油量と鋼板の組合せを表す表である。
FIG. 1 is a configuration diagram schematically showing a configuration when joining steel strips according to the present invention.
In particular, FIG. 1A shows a state before joining, and FIG. 1B shows a state after joining.
Table 1 is a table showing the composition and combination of each steel strip when the rear end portion of the preceding steel strip and the front end portion of the subsequent steel strip are joined by the flash butt welding method.
Table 2 is a table showing the combination of the oil coating amount and the steel plate when performing flash butt welding.
図１（ａ）に示すように、先行する鋼帯１と後続する鋼帯２には、電極４が両面に取り付けられている。両方の鋼帯１，２の接合部分には油脂が塗布してある。後続する鋼帯２を電極４と共に移動させ、図１（ｂ）に示すように接合させてフラッシュバット溶接を行う。先行する鋼帯１と後続する鋼帯２との間には溶接接合部３が生じる。
As shown to Fig.1 (a), the
表１に示す２種類の板厚の低Ｓｉ特殊鋼と３種類の板厚高Ｓｉ特殊鋼を実機フラッシュバット溶接機で表２に示す塗油条件の下で、先行鋼帯の後端部と後続鋼帯の先端部とをフラッシュバット溶接により突き合わせ溶接し、各試料につき接合鋼帯を得た。 Under the oiling conditions shown in Table 2, using the two types of low-thickness special steels with the thickness shown in Table 1 and the three types of high-thickness Si special steels with the actual flash butt welding machine, The tip of the subsequent steel strip was butt welded by flash butt welding to obtain a bonded steel strip for each sample.
各接合鋼帯について、鋼帯１，２の溶接接合部３を中心として、鋼帯の長さ方向に２００ｍｍ幅の溶接近傍部を切り出し、更にこの溶接近傍部を溶接接合部３に沿って、両エッジ５０ｍｍ位置、両サイド幅方向１／４位置、幅方向中心位置の５点を切り出し、５枚の引っ張り試験片を作成した。各試験片について、引張り試験を行い溶接接合部が破断に至る引張り応力を測定した。表２の接合部引張強さは、これらの平均値を示す。 For each bonded steel strip, centering on the welded joints 3 of the steel strips 1 and 2, a 200 mm wide weld vicinity is cut out in the length direction of the steel strip, and further this weld vicinity is along the weld joint 3, Five tensile test pieces were prepared by cutting out 5 points at 50 mm on both edges, 1/4 position on both sides in the width direction, and center position in the width direction. For each test piece, a tensile test was performed to measure the tensile stress at which the welded joint was broken. The joint tensile strength in Table 2 shows an average value of these.
この引張り試験は溶接部の接合強度を定量化するために実施したものであり、これまでの調査経験によると、通板中や圧延時に溶接部破断を起こさない為には、接合部引張り強さが３００Ｎ／ｍｍ２以上あることが必要であることが判明している。 This tensile test was conducted in order to quantify the joint strength of the weld. According to past research experience, the tensile strength of the joint was not detected in order to prevent the weld from breaking during sheeting or rolling. Has been found to be 300 N / mm 2 or more.
表２の試料Ｎｏ．１〜８に示すように、低Ｓｉ量の共試材Ａ〜Ｄでは本発明の油脂の塗油を行わずとも、引張り強さは３６６〜３８１Ｎ／ｍｍ２で、破断限界値の３００Ｎ／ｍｍ２を十分に満足する値が得られているのに対して、高Ｓｉ量の供試材Ｅ〜Ｈは薄物では、破断限界値を満足するものの、中間厚では破断限界値を下回り、さらに、厚物では大きく下回る。つまり溶接接合強度はＳｉ量と板厚に大きく依存し、特許請求の範囲の請求項１に記載してあるＳｉ量と板厚の条件では板破断の確率が極めて高い。 Sample No. in Table 2 As shown in 1 to 8, in the low Si content co-materials A to D, the tensile strength is 366 to 381 N / mm 2 without applying the oil of the present invention, and the fracture limit value is 300 N / mm. 2 is sufficiently satisfactory, while the specimens E to H having a high Si content satisfy the fracture limit value in the thin material, but are below the fracture limit value in the intermediate thickness, It is much lower for thick materials. That is, the weld joint strength greatly depends on the Si amount and the plate thickness, and the probability of plate breakage is extremely high under the conditions of the Si amount and the plate thickness described in claim 1 of the claims.
表２より、試料Ｎｏ．８の塗油の無い高Ｓｉ特殊鋼の厚物と本発明実施例の試料Ｎｏ．１１〜１４及び１７〜２２を比較すると、試料Ｎｏ．８では２４２Ｎ／ｍｍ２と３００Ｎ／ｍｍ２を下回っているのに対して、本発明の高Ｓｉ特殊鋼は最低でも３１５Ｎ／ｍｍ２であり全て３００Ｎ／ｍｍ２を上回っている。また、本発明の高Ｓｉ特殊鋼の試料Ｎｏ．９、１０、１５、１６及び２３、２４については、油脂の動粘度及び塗油量が特許請求の範囲の請求項３に記載する範囲から外れており、接合部の強度が特許請求の範囲の請求項３に記載する範囲内のものと比べて低下する傾向が見られる。 From Table 2, Sample No. No. 8 thick high Si special steel without oil coating and sample No. When comparing 11-14 and 17-22, sample no. Whereas below the 8, 242n / mm 2 and 300N / mm 2, the high Si special steel of the present invention is above all a 315N / mm 2 300N / mm 2 at least. Further, the sample No. of the high Si special steel of the present invention. For 9, 10, 15, 16 and 23, 24, the kinematic viscosity of the oil and fat and the amount of oil coating are out of the range described in claim 3 of the claims, and the strength of the joint is within the scope of the claims. The tendency to fall compared with the thing within the range described in Claim 3 is seen.
以上説明したように、本発明によれば油脂を接合部端部に塗布するだけで、軟鋼に比して溶接が難しい特殊鋼の中でも特に酸化されやすいＳｉ、Ｍｎ等の元素を多量に含む高合金特殊鋼を接合する場合であっても、鋼帯接合部が高品質の接合鋼帯を容易に得ることができ、生産性に優れ、接合部破断によるラインの休止を未然に防ぐことが可能になる。 As described above, according to the present invention, a high amount containing elements such as Si and Mn which are particularly easily oxidized among special steels that are difficult to weld compared to mild steel, simply by applying oil and fat to the joint end. Even when joining special alloy steel, steel strip joints can easily obtain high-quality joint steel strips, which are excellent in productivity and can prevent line breaks due to joint breakage. become.
本発明において、鋼飯端部の接合手段としては、フラッシュバット溶接が好適である。フラッシュバット溶接によれば、フラッシングの際に鋼帯端部に塗布された油脂がフラッシングの熱で引火し、燃焼する為、点火手段を特に要しないからである。もちろんレーザー溶接、ティグ溶接等の他の接合手段でもよく、接合手段とは別個に油脂を燃焼させるための点火手段を付設しても良い。 In the present invention, flash butt welding is suitable as the joining means of the steel rice end. This is because, according to flash butt welding, the oil applied to the end of the steel strip at the time of flushing is ignited and burned by the heat of flushing, so that no ignition means is required. Of course, other joining means such as laser welding and TIG welding may be used, and an ignition means for burning oil and fat may be provided separately from the joining means.
本発明の連続接合鋼板は、先行鋼帯の後端部と後続鋼帯の先端部とを接合した連続接合鋼帯であって、先行鋼帯または後続鋼帯の少なくとも一方が、１．５０重量％以上のシリコン濃度と、４．５０ｍｍ以上の板厚とを有している。４０℃における動粘度が１００ｃｓｔを超えかつ２５０ｃｓｔ以下の粘性を有する油脂を接合前の先行鋼帯の後端部及び後続鋼帯の先端部に塗布し、油脂被膜を形成した上で溶接を行う。一部の油脂は燃焼させた状態で両端部が接合されたものであり、油脂被膜によるシールド効果と、接合の際の油脂の燃焼による接合部周囲の酸素低減効果と、更に非酸化性ガスによるガスシールド効果により接合部界面での酸化物生成が防止され、強度劣化の生じ難い、高品質の接合部を有する接合鋼帯を提供することができる。 The continuously joined steel sheet of the present invention is a continuously joined steel band obtained by joining the rear end portion of the preceding steel strip and the front end portion of the succeeding steel strip, and at least one of the preceding steel strip or the succeeding steel strip has a weight of 1.50. % Silicon concentration and a plate thickness of 4.50 mm or more. Oil having a kinematic viscosity at 40 ° C. exceeding 100 cst and having a viscosity of 250 cst or less is applied to the rear end portion of the preceding steel strip before joining and the front end portion of the subsequent steel strip to form an oil coating, and then welding is performed. Some oils and fats are joined at both ends in a burned state, the shielding effect by the oil film, the oxygen reduction effect around the joints by the burning of oils and fats at the time of joining, and the non-oxidizing gas Oxide generation at the interface of the joint is prevented by the gas shielding effect, and it is possible to provide a bonded steel strip having a high-quality joint that hardly causes deterioration in strength.
本発明において油脂の種類は、通常の潤滑油、鉱油に石けん類を混合撹拌した糊状潤滑油であるグリース、或いは両者を適度に混合し粘度を調整したものなど、接合時に被膜を形成することが可能である。燃焼時に非酸化性の不活性ガスを発生する種類のものならいずれのものでもよく、特に限定はされない。 In the present invention, the type of oil and fat is a normal lubricating oil, a grease that is a paste-like lubricating oil obtained by mixing and stirring soaps in mineral oil, or a film in which the viscosity is adjusted by mixing them together to form a film at the time of joining. Is possible. Any type that generates a non-oxidizing inert gas during combustion may be used without any particular limitation.
油脂の塗布方法としては、フェルト等油脂を吸収することが可能な材質を使用したローラに油脂を含ませ、ローラを鋼板端部に接触させながら幅方向に移動させ鋼板端部に均等に塗布する方法、或いは人手により刷毛で塗布する方法がある。塗布方法はこれらに限定されず、油脂が均一に塗布されれば他の塗布方法であってもよい。 As a method of applying oil and fat, oil and fat is included in a roller that uses a material that can absorb oil and fat such as felt, and the roller is moved in the width direction while being in contact with the end of the steel plate, and applied evenly to the end of the steel plate. There is a method or a method of applying manually with a brush. The coating method is not limited to these, and other coating methods may be used as long as the fats and oils are uniformly coated.
また油脂の塗布位置は、先行鋼帯の後端部、及び後続鋼帯の先端部とし、塗布面は上面及び下面とするのが望ましい。 Further, the application position of the oil and fat is preferably the rear end portion of the preceding steel strip and the front end portion of the subsequent steel strip, and the application surface is preferably the upper surface and the lower surface.
１、２ 鋼帯、３ 溶接接合部。 1, 2, steel strip, 3 welded joints.
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