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TR201922698A2 - Steel and production method for hinges used in manual or automatic opening-closing systems - Google Patents

Steel and production method for hinges used in manual or automatic opening-closing systems

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Publication number
TR201922698A2
TR201922698A2 TR2019/22698A TR201922698A TR201922698A2 TR 201922698 A2 TR201922698 A2 TR 201922698A2 TR 2019/22698 A TR2019/22698 A TR 2019/22698A TR 201922698 A TR201922698 A TR 201922698A TR 201922698 A2 TR201922698 A2 TR 201922698A2
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TR
Turkey
Prior art keywords
steel
feature
hinges
martensite
manual
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TR2019/22698A
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Turkish (tr)
Inventor
Gündüz Oğuz
Bulut Özyi̇ği̇t Mehmet
Kiliç Yasemi̇n
Original Assignee
Eregli Demir Ve Celik Fabrikalari T A S
Ereğli̇ Demi̇r Ve Çeli̇k Fabri̇kalari Türk Anoni̇m Şi̇rketi̇
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Priority to TR2019/22698A priority Critical patent/TR201922698A2/en
Publication of TR201922698A2 publication Critical patent/TR201922698A2/en

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Abstract

Bu buluş; ahşap ve/veya alüminyum doğrama ve/veya çelik bazlı malzemelerden üretilen, mobilya vb alanlarda kullanım alanı bulan, manuel ya da otomatik açılır kapanır sistemlerdeki menteşe için çelik ve üretim yöntemi ile ilgilidir. Bu buluş sertleşebilirlik kabiliyeti yüksek borlu çeliğin güvenlik ekipmanlarında kullanılabilirliğini ve üretim yöntemini kapsamaktadır.This invention; It is about steel and production method for hinges in manual or automatic opening and closing systems, which are made of wood and/or aluminum joinery and/or steel-based materials, which find use in furniture etc. This invention covers the use of boron steel with high hardenability in safety equipment and its production method.

Description

TARIFNAME MANUEL YA DA OTOMATIK AÇILlR-KAPANIR SISTEMLERDE KULLANILAN MENTESELER IÇIN ÇELIK VE ÜRETIM YÖNTEMI Teknik Alan Bu bulus; ahsap ve/veya alüminyum dograma ve/veya çelik bazli malzemelerden üretilen, mobilya vb. alanlarda kullanim alani bulan, manuel ya da otomatik açilir- kapanir sistemlerdeki mentese için çelik ve üretim yöntemiyle ilgilidir. Teknigin Bilinen Durumu Otomotiv, beyaz esya, agir sanayi, isitma sistemleri, boru, insaat, otoyol, vb birçok sektörde demir ve demir-çelik ürünleri kullanilmaktadir. Özellikle çelikler yüksek mukavemet özellikleri ve geri dönüstürülebilir olmasi sebebiyle çevre dostu oldugu gibi kisisel güvenligimizin saglanmasinda büyük rol oynar. Kullanim ömrü açisindan degerlendirme yapildiginda birçok alanda kullandigimiz çelik malzemelerin mühendislik tasarimlarinin ne kadar önemli oldugu karsimiza çikmaktadir. Bu dogrultuda inceleme yapildiginda en iyi düzeyde performans elde edebilmek için mühendislik tasarimlari ile uygun alanda uygun malzemelerin kullanilmasi oldukça önemli olup gelisen teknoloji ile birlikte tasarimlarin da güncellenmesi gerekmektedir. Bu ve buna benzer alanlardan biri de özellikle mobilya sektöründe kullanim alani bulan ve dolap kapaklarinin manuel ya da otomatik olarak açilip kapanmasi görevini gören mentese malzemelerinin seçimi ile ilgilidir. Metalürjik olarak mentese malzemeleri oda sicakliginda sürekli olarak açilip kapanma görevini üstlenmekte dolayisiyla ilgili ekipmanin kullanim ömrünü etkileyen yorulma mekanizmasi devreye girmektedir. Mentese malzemesinin seçiminde en önemli kriter yorulma dayaniminin yüksek olmasidir. Malzeme degisken yüklere maruz kaldigi zaman ortaya çikan kirilmanin tehlikeli bir sekline yorulma denir. ASTM standartlari yorulmayi "Bir malzemede bazi bölge veya bölgelerdeki degisken gerilme ve sekil degisiminin meydana getirdigi ve belli sayida yüklemeden sonra çatlak veya kirilma ile sonuçlanan islem" olarak tanimlamaktadir. Mühendislik malzemelerinin % 80'i bu nedenle kirilmaktadir. Klasik elastisite teorisine göre akma gerilmesinin altinda yüklemeye maruz kalan parçalarda sadece elastik deformasyon meydana gelecegi kabul edilmektedir. Bu bölgede bilindigi gibi malzemede herhangi bir tahribat meydana gelmez. Buna karsin dinamik yükler altinda akma gerilmesinin altinda çalistirilan malzemelerde bir süre sonra tahribat meydana geldigi saptanmistir. Yukarida verilen bilgilerden de öngörülebilecegi gibi çevrimsel yüklemeler esnasinda malzemenin maruz kaldigi yük akma mukavemetinin altinda olsa dahi beklenmedik hasarlanmalarin olmasi olagandir. Bu durumda yorulma mekanizmasina etkiyen en önemli iki faktör karsimiza çikar; i)malzemenin akma mukavemeti, ii)çelik üretim prosesinden kaynakli çelik iç kirliligi ve mikro-çatlaklar. Yüksek akma mukavemetine sahip malzemelerin yorulma kaynakli hasarlanmalara karsi daha iyi direnç gösterecegi teorik olarak bilinmektedir. Ancak çelik iç temizligi kaynakli problemler malzemelerin yerinde kullanimi esnasinda beklenenden daha erken sürede yorulmalarina sebep olabilir. Birçok ekipmanda kullanilan manuel ya da otomatik açilir-kapanir sistemlerdeki mentesenin sertlesebilirlik kabiliyeti ve yorulma dayanimi yüksek çelikten yapilmasi kullanim ömrü açisindan son derece önemlidir. Sertlesebilirlik özelliklerinden dolayi özellikle alasim kimyasi içeriginde kütlece %C(Karb0n) degeri yüksek çeliklerin bu ürünler için kullanilmasi teknikte bilinen bir durumdur. Ancak ilgili çeliklerin dökümünde karsilasilan C segregasyonu probleminin (mekanik özellikleri ve yorulma dayanimini olumsuz etkiler) yani sira yüksek karbon eslenigi sebebiyle kaynaklanma kabiliyeti kötü olan bu çeliklerin sürekli hatlarda üretimi zor olmaktadir. Segregasyon sivi çeligin dendritik katilasmasi esnasinda karbon, fosfor, mangan gibi elementlerin sürekli olarak katilasmanin tamamlanmadigi sivi bölgeye difüzyonu sonucu meydana gelen katilasmama olgusudur. Katilasma ingot ya da döküm parçanin dis yüzeyinde baslar ve yüzeye göre daha sicak olan merkez bölgesinin kenarlara göre daha geç katilasmasi olgusu meydana gelir. Dolayisiyla bahsi geçen segregasyon elementleri katilasmis nihai ürünün merkezinde, kenarlara göre daha yüksek oranlarda yer alabilmektedir. Segregasyon elementlerinin yapida yüksek oranda bulunmasi katilasan parçanin merkez hattinda daha da yüksek oranlarda bulunacagini göstermektedir. Ek olarak soguk sekillendirme prosesinde teknik sikintilar yasanabilmektedir. Teknigin bilinen durumunda sertlesebilirlik kabiliyeti yüksek karbon (C) çeliklerinin (CK45, CK50 vb.) kullanimi söz konusudur ve ilgili çeliklerin dökümünde karsilasilan C segregasyonu probleminin (mekanik özellikleri ve yorulma dayanimini olumsuz etkiler) yani sira yüksek karbon eslenigi sebebiyle kaynaklanma kabiliyetleri de kötülesmektedir. Ayrica isil islem öncesi uygulanan soguk sekil verme prosesinde zorluklar da yasanabilmektedir. Yukarida anlatilan olumsuzluklar kullanicilari ve üreticileri menfi yönde etkilemektedir. Önceki teknige ait yapilan patent arastirmasinda "Thin Joint Member Producing baglanti elemaninin borlu çelikten üretilmesi suretiyle daha ince çelik malzemelerin kullanimina olanak saglanabilecegini dolayisiyla agirlik avantaji saglanabilecegini tariflemektedir. Aluminyum 6061 alasiminin ekstrüzyonu yöntemi ile enerji dönüsüm kabinlerinin kapisinda kullanilmak üzere tek parça mentese üretiminin konu edildigi CN108043898 yayin numarali patentte yüksek sertlik elde edilebildigi, düsük agirlik saglanabildigi bunun yaninda da yüksek korozyon dayanimi elde edildigi belirtilmistir. Bulu un özümünü Ama ladi iTeknik Problemler Mevcut bulus, ahsap ve/veya alüminyum dograma ve/veya çelik bazli malzemelerden üretilen, mobilya vb alanlarda kullanim alani bulan, manuel ya da otomatik açilir-kapanir sistemlerdeki mentese ile ilgili olup yukarida bahsedilen dezavantajlari ortadan kaldiran ve/veya ilave bazi avantajlar getiren bir baglanti elemanini tarif etmektedir. Bulusun ana amaci, güncel hayatta birçok ekipmanda kullanilan manuel ya da otomatik açilir-kapanir sistemlerdeki mentesenin karbon çeliklerine göre daha düsük C alasimi içerigine sahip sertlesebilirlik kabiliyeti ve yorulma dayanimi yüksek çelik ile daha uzun süreler çalisabilirliginin saglanmasidir. Bulusun diger amaci, soguk sekillendirme kabiliyeti ve islenebilirlik özelliklerinin daha iyi olmasidir. Bulusun bir diger amaci, sahip oldugu alasim kimyasi sayesinde daha düsük Ac1 ve Acß sicakliklarinda tavlama yapabilme imkani sunmasidir. Bu sayede kullanicilar daha düsük sicakliklarda isil islem proseslerini daha düsük sicaklikta gerçeklestirirler. Resimlerin Aciklanmasi Sekil 1: Akis Semasi Bulusun Açiklamasi Bu açiklamada, bulus konusu mentese hakkinda detayli bilgi verilecektir. Soguk haddelenmis ve sürekli tavlanmis 22MnBS çeliginin sertlestirme isil islemini kapsamaktadir. 22MnBS çeligi kimyasal kompozisyonu agirlikça, 0. 5 0.28, 1. 5 1.40, 5 B (Bor)(ppm) s 50 alasim elementlerinden, kalan kismi demir ve istenmeyen kalinti elementlerden olusmaktadir. Ilgili çeligin akma mukavemeti 350-450 MPa, çekme mukavemeti 500- -25'dir. Sekil 1*de akis semasi da gösterilen bulusun üretim yöntemi su sekilde olmaktadir: Soguk haddelenmis ve tavlanmis olarak üretilen borlu çeligi mentese üretiminde kullanilmak üzere sekiIIendirme/egme/bükme/kesme makinasinda soguk sekillendirilir. Tercihen borlu Çelik olarak 22MnBS seçilebilir. Ardindan mentesede kullanilmak üzere form verilmis numuneler borlu çeliginin AC3 sicakligina yakin ya tutulmaktadir. Bu islem, sert faz dönüsümünün saglanmasi amaciyla önem arz etmekle birlikte gereginden yüksek sicakliklarda ve sürede yapilan tavlama isleminde nihai üründe göreceli iri tane boyutlarinin elde edilmesi söz konusu olacak, mekanik testlerin düsmesine sebep olacaktir. Borlu çelikler içerdikleri bor alasim elementi sayesinde su verme islemi ile yüksek performansta sert faz (martenzit) dönüsümünün saglanmasina olanak saglarlar. Çünkü östenitleme sicakliginda bor, östenit tane sinirina difüze olarak ferrit çekirdeklenmesini geciktirir. Dolayisiyla martenzit dönüsümü için elverisli bir durum saglanir. Sogutma hizinin °C/s'nin üzerinde olmasi durumunda içyapi %90 oraninda martenzit fazindan olusmaktadir. Bulus konusu patente istenilen sertligi saglamak adina mikroyapi, %85 oraninda martenzit içerir. Tavlama islemini takiben tavlanmis numuneler 50- 100°C`deki tuz banyosuna aktarilmaktadir. Bu islem sert faz dönüsümü için kritik sogutma hizina (~25°C/s) esit ya da yüksek hizda soguma elde edilmesine yardimci olmaktadir. Ardindan yorulma dayaniminin iyilestirilmesinin yaninda sert faz dönüsümü sebebiyle meydana gelecek kirilganlik/gevrekligin giderilmesi için yapida bulunan sert faz (martenzit) içinde çözünmüs C elementi uygun kafes bosluklarina difüze olur. Bununla birlikte faz yapisindaki çarpilmalarin da azalmasi saglanir. Bu islem ile martenzit sertligi bir miktar azalsa dahi tokluk ve yorulma dayanimi özelliklerinde iyilesme saglanir. Konu proses sonrasi mikroyapi, %85 oraninda martenzit fazi içerirken bu martenzitlerin ise %30-100 arasinda temperlenmis martenzittir. Isil islemi tamamlanmis ürünlere yüzeyde olusabilecek oksitlerin giderilmesi amaciyla kumlama ya da asitleme islemi yapilabilir. Bu islemi takiben nikel, çinko, alüminyum silisyum, vb kaplama türleri ile elektrolitik ya da sicak daldirma ile kaplama yöntemi ile malzemeler korozyondan korunmak için kaplanir. Tercihen; nihai üründe optimum tane boyutu elde edilebilmesi amaciyla 900°- 925°C`de tavlama yapilmasi uygundur. Tercihen hedeflenen yorulma dayanimi ve diger özellikler dogrultusunda tavlama süresi, zaman ve maliyet kazanci için sinirlandirilabilmekle birlikte 15 dakikanin altina düsmemesi gerekmektedir. Tavlama süresinin 25 dakika tercih edilmesi uygundur. 30 dakika üzeri yapilan isil islemlerde istenmeyen tane büyümesi meydana gelir. Yüksek oranda martenzitik dönüsümün elde edilebilmesi için tuz banyosunun 22MnBS çeliginin Ms (martenzit dönüsüm baslangiç) sicakliginin altinda olmasi tercih edilmektedir. Bu dogrultuda tuz banyosunun belirtilen araligin daha daraltilmis hali olan 50° - 75°C sicakliklari arasinda olmasi uygundur. Bulusun Sanavive Uvqulanma Biçimi Bulus, demir-çelik endüstrisinde, çelik üretim, sürekli döküm, sicak haddeleme, soguk haddeleme ve sürekli tavlama sürecinden geçerek üretilen 22lVlnBS'e, çelik mentese üretim süreci için isil islem tesisinde sertlestirme tavlamasi yapilmasini kapsamaktadir. TR TR DESCRIPTION STEEL AND PRODUCTION METHOD FOR HINGES USED IN MANUAL OR AUTOMATIC OPENING-CLOSING SYSTEMS Technical Field This invention; Furniture, etc. produced from wood and/or aluminum joinery and/or steel-based materials. It is related to the steel and production method for the hinges in manual or automatic opening-closing systems, which are used in areas. Known Status of the Technology Iron and iron-steel products are used in many sectors such as automotive, white goods, heavy industry, heating systems, pipes, construction, highways, etc. Especially steels are environmentally friendly due to their high strength properties and recyclability, and play a major role in ensuring our personal safety. When evaluated in terms of lifespan, we see how important the engineering designs of the steel materials we use in many areas are. When examined in this direction, it is very important to use engineering designs and appropriate materials in the appropriate area in order to achieve the best performance, and the designs need to be updated with the developing technology. One of these and similar areas is related to the selection of hinge materials, which are used especially in the furniture industry and serve as manual or automatic opening and closing of cabinet doors. Metallurgically, hinge materials undertake the task of constantly opening and closing at room temperature, thus the fatigue mechanism that affects the service life of the relevant equipment comes into play. The most important criterion in selecting the hinge material is its high fatigue resistance. A dangerous form of fracture that occurs when a material is subjected to variable loads is called fatigue. ASTM standards define fatigue as "the process caused by variable stress and deformation in some region or regions of a material, resulting in cracks or fractures after a certain number of loads." 80% of engineering materials break for this reason. According to the classical theory of elasticity, it is accepted that only elastic deformation will occur in parts subjected to loading below the yield stress. As is known, no damage to the material occurs in this region. On the other hand, it has been determined that damage occurs after a while in materials worked under yield stress under dynamic loads. As can be predicted from the information given above, it is possible for unexpected damage to occur during cyclic loading, even if the load to which the material is exposed is below its yield strength. In this case, the two most important factors affecting the fatigue mechanism emerge; i)yield strength of the material, ii)steel internal contamination and micro-cracks caused by the steel production process. It is theoretically known that materials with high yield strength will show better resistance to fatigue-related damage. However, problems caused by internal steel cleaning may cause the materials to fatigue earlier than expected during on-site use. It is extremely important for the service life that the hinges in manual or automatic opening-closing systems used in many equipment are made of steel with high hardenability and fatigue resistance. It is known in the art that steels with high %C (Carb0n) value by mass, especially in alloy chemistry, are used for these products due to their hardenability properties. However, due to the C segregation problem encountered in the casting of the relevant steels (which negatively affects the mechanical properties and fatigue strength) as well as the high carbon content, these steels, which have poor weldability, are difficult to produce in continuous lines. Segregation is the non-solidification phenomenon that occurs during the dendritic solidification of liquid steel as a result of the continuous diffusion of elements such as carbon, phosphorus and manganese into the liquid region where solidification is not completed. Solidification begins on the outer surface of the ingot or casting part, and the central region, which is hotter than the surface, solidifies later than the edges. Therefore, the mentioned segregation elements can be located at higher rates in the center of the solidified final product than at the edges. The high presence of segregation elements in the structure indicates that they will be found at even higher rates at the center line of the solidified part. In addition, technical difficulties may occur in the cold forming process. In the state of the art, carbon (C) steels with high hardenability (CK45, CK50, etc.) are used, and the C segregation problem encountered in the casting of the relevant steels (which negatively affects mechanical properties and fatigue strength) as well as their weldability is deteriorated due to high carbon equivalentity. In addition, difficulties may be experienced in the cold forming process applied before heat treatment. The negativities described above negatively affect users and producers. In the patent research on the previous technique, "Thin Joint Member Producing" describes that the use of thinner steel materials can be enabled by producing the connecting element from boron steel, and therefore a weight advantage can be achieved. CN108043898 spring, which is about the production of one-piece hinges to be used on the doors of energy conversion cabinets by the extrusion method of aluminum 6061 alloy. get in It is stated in the patent numbered that high hardness can be achieved, low weight can be achieved, as well as high corrosion resistance.Technical Problems That Provided the Solution of the Invention The current invention is produced from wood and/or aluminum joinery and/or steel-based materials, and is used in furniture etc. describes a fastener that is related to the hinge in manual or automatic opening-closing systems and eliminates the above-mentioned disadvantages and/or brings some additional advantages. The main purpose of the invention is to determine the carbon hinge of the hinge in manual or automatic opening-closing systems used in many equipment in daily life. It is possible to work for longer periods of time with steel that has lower C alloy content than steels, has higher hardenability and fatigue resistance. Another purpose of the invention is to have better cold forming ability and machinability properties. Another purpose of the invention is to provide the opportunity to anneal at lower Ac1 and Acß temperatures, thanks to its alloy chemistry. In this way, users can perform heat treatment processes at lower temperatures. Description of the Pictures Figure 1: Flow Diagram Description of the Invention In this explanation, detailed information will be given about the hinge that is the subject of the invention. It covers the hardening heat treatment of cold rolled and continuously annealed 22MnBS steel. The chemical composition of 22MnBS steel consists of 0.5 0.28, 1.5 1.40, 5 B (Boron) (ppm) s 50 alloy elements by weight, and the remaining part consists of iron and unwanted residual elements. The yield strength of the relevant steel is 350-450 MPa and the tensile strength is 500--25. The production method of the invention, whose flow chart is shown in Figure 1, is as follows: Boron steel produced as cold rolled and annealed is cold-formed in a forming/bending/bending/cutting machine to be used in the production of hinges. Preferably, 22MnBS can be chosen as boron steel. Then, the samples shaped to be used in the hinge are kept close to the AC3 temperature of the boron steel. Although this process is important to ensure hard phase transformation, annealing at higher temperatures and times than necessary will result in relatively coarse grain sizes in the final product, causing mechanical tests to decrease. Thanks to the boron alloy element they contain, boron steels enable high performance hard phase (martensite) transformation through quenching. Because at the austenitizing temperature, boron diffuses into the austenite grain boundary and delays ferrite nucleation. Therefore, a favorable situation is provided for martensite transformation. If the cooling rate is above °C/s, the internal structure consists of 90% martensite phase. In order to provide the desired hardness to the patent subject to the invention, the microstructure contains 85% martensite. Following the annealing process, the annealed samples are transferred to a salt bath at 50-100°C. This process helps to achieve cooling at a rate equal to or higher than the critical cooling rate (~25°C/s) for hard phase transformation. Then, the C element dissolved in the hard phase (martensite) in the structure diffuses into the appropriate lattice spaces in order to improve fatigue strength as well as to eliminate the brittleness/brittleness that will occur due to hard phase transformation. In addition, distortions in the phase structure are reduced. With this process, even if the hardness of martensite decreases slightly, the toughness and fatigue strength properties are improved. While the post-process microstructure contains 85% martensite phase, between 30-100% of this martensite is tempered martensite. Products whose heat treatment has been completed can be sandblasted or pickled to remove oxides that may form on the surface. Following this process, the materials are coated with electrolytic or hot dip coating methods with coating types such as nickel, zinc, aluminum silicon, etc. to protect them from corrosion. Preferably; In order to obtain optimum grain size in the final product, it is appropriate to anneal at 900°- 925°C. Preferably, in line with the targeted fatigue strength and other properties, the annealing time can be limited for time and cost savings, but should not fall below 15 minutes. It is appropriate to choose an annealing time of 25 minutes. Unwanted grain growth occurs in heat treatments performed for more than 30 minutes. In order to obtain a high rate of martensitic transformation, it is preferred that the salt bath be below the Ms (martensite transformation start) temperature of 22MnBS steel. Accordingly, it is appropriate for the salt bath to be between 50° - 75°C, which is a narrower version of the specified range. How to Apply and Apply the Invention The invention involves hardening annealing of 22lVlnBS, which is produced in the iron and steel industry through steel production, continuous casting, hot rolling, cold rolling and continuous annealing processes, in the heat treatment facility for the steel hinge production process. TR TR

Claims (1)

ISTEMLER Bulus, manuel ya da otomatik açilir-kapanir sistemlerde mentese için çelik üretim yöntemi olup özelligi; -Soguk haddelenmis ve tavlanmis olarak üretilen borlu çeliginin menteselerde kullanilmasina yönelik sekillendirme/egme/bükme/kesme makinasinda form verilmesi, -Menteselerde kullanilmak üzere form verilmis borlu çeligin Acß sicakligina islemine tabi tutulmasi -Tavlama islemini takiben tavlanmis numunelerin 50° - 100°C'deki tuz banyosuna aktarilmasi ve bu islemle 25°C/saniye'den yüksek sogutma hizi saglanmasi sonrasinda oda sicakligina denge soguma hizinda sogutulmasi -Isil islemi tamamlanmis ürünlere yüzeyde olusabilecek oksitlerin giderilmesi amaciyla tercihen kumlama ya da asitleme islemi yapilmasi -Kumlanan malzemelerin elektrolitik ya da sicak daldirma yöntemi ile çinko, nikel, alüminyum-silisyum gibi kaplamalarla kullanim süresi boyunca korozyondan korunmasi için kaplanmasi islem adimlarini içermesidir. istem 1'e göre yöntem olup, özelligi; borlu çeligin 22lVlnBS çeligi olmasidir. istem 1 veya 2'deki gibi yöntem olup, özelligi; çeliginin kimyasal kompozisyonunun agirlikça, 0.18 5 %C 5 0.28,CLAIMS The invention is a steel production method for hinges in manual or automatic opening-closing systems and its feature is; -Giving the cold rolled and annealed boron steel to form in the forming/bending/bending/cutting machine for use in hinges, -Treating the boron steel formed to be used in hinges to Acß temperature. -Following the annealing process, the annealed samples are heated at 50° - 100°C. Transferring it to a salt bath and ensuring a cooling rate higher than 25°C/second with this process, then cooling it to room temperature at the equilibrium cooling rate - Preferably performing sandblasting or etching process on the products whose heat treatment has been completed in order to remove the oxides that may form on the surface - Electrolytic or hot dipping method of the sandblasted materials. and coating with coatings such as zinc, nickel, aluminum-silicon to protect it from corrosion during the period of use. It is a method according to claim 1 and its feature is; boron steel is 22lVlnBS steel. It is a method as in claim 1 or 2, and its feature is; The chemical composition of steel by weight is 0.18 5%C 5 0.28, 1.10 5 %lVln 5 1.40, 10 s B(ppm) s 50 alasim elementlerinden, kalan kismi demir ve istenmeyen kalinti elementlerden olusmasidir. istem 3'e göre çelik olup, özelligi; ilgili çeligin akma mukavemetinin 15-25 olmasidir. 1-4 nolu istemlerden herhangi birindeki gibi bir yöntem olup özelligi; tavlama gerçeklestirilmesidir. 1-5 nolu istemlerden herhangi birindeki gibi bir yöntem olup özelligi; tavlanmis numunelerin sert faz dönüsümünü saglanmasi amaciyla 50°- 75°C'deki tuz banyosuna aktarilmasi islemini içermesidir. 1-6 nolu istemlerden herhangi birindeki gibi bir yöntem olup özelligi; numunelerin 300 - 400°C arasindaki bir sicaklikta 30 dakika temperlenmesi adimini içermesidir. 1-? nolu istemlerden herhangi birindeki gibi bir yöntem olup özelligi; nihai üründe mikroyapinin >%85 oraninda martenzit fazini içermesi bu martenzitlerin ise %30-100 arasinda temperlenmis martenzit olmasidir.1.10 5 %lVln 5 1.40, 10 s B(ppm) s It consists of 50 alloy elements, the remaining part being iron and unwanted residual elements. It is steel according to claim 3 and its feature is; The yield strength of the relevant steel is 15-25. It is a method as in any of the claims no. 1-4 and its feature is; annealing is carried out. It is a method as in any of the claims no. 1-5 and its feature is; It involves transferring the annealed samples to a salt bath at 50°-75°C in order to ensure hard phase transformation. It is a method as in any of the claims no. 1-6 and its feature is; It includes the step of tempering the samples at a temperature between 300 - 400°C for 30 minutes. one-? It is a method as in any of the claims and its feature is; The microstructure in the final product contains >85% martensite phase, and this martensite is between 30-100% tempered martensite.
TR2019/22698A 2019-12-31 2019-12-31 Steel and production method for hinges used in manual or automatic opening-closing systems TR201922698A2 (en)

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