{"id":2248,"date":"2021-08-09T13:45:34","date_gmt":"2021-08-09T13:45:34","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2248"},"modified":"2021-08-09T13:46:53","modified_gmt":"2021-08-09T13:46:53","slug":"how-the-alloying-element-affect-the-stainless-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/pl\/how-the-alloying-element-affect-the-stainless-steel\/","title":{"rendered":"Jak elementy stopowe wp\u0142ywaj\u0105 na stal nierdzewn\u0105?"},"content":{"rendered":"<p>Sk\u0142ad chemiczny ma ogromny wp\u0142yw na mikrostruktur\u0119, w\u0142a\u015bciwo\u015bci mechaniczne, w\u0142a\u015bciwo\u015bci fizyczne i odporno\u015b\u0107 na korozj\u0119 stali. Chrom, molibden, nikiel i inne pierwiastki stopowe mog\u0105 zast\u0105pi\u0107 k\u0105t Vertex p\u0142aszcza austenitowego i centrum sze\u015bciu p\u0142aszczy z \u017celiwa, w\u0119giel i azot znajduj\u0105 si\u0119 w szczelinie mi\u0119dzy atomami p\u0142aszcza (pozycja szczeliny) ze wzgl\u0119du na niewielki obj\u0119to\u015b\u0107, co powoduje ogromne napr\u0119\u017cenie w p\u0142aszczu, staj\u0105c si\u0119 tym samym skutecznymi elementami utwardzaj\u0105cymi. R\u00f3\u017cne pierwiastki stopowe maj\u0105 r\u00f3\u017cne efekty na w\u0142a\u015bciwo\u015bci stali, czasami korzystne, a czasem szkodliwe. G\u0142\u00f3wnymi pierwiastkami stopowymi stali nierdzewnej Austenitowej maj\u0105 nast\u0119puj\u0105ce efekty:<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Cr<\/strong><\/p>\n<p>Chrom jest elementem stopowym, kt\u00f3ry sprawia, \u017ce stal nierdzewna jest \u201enie rdzewiej\u0105ca\u201d. Do tworzenia powierzchniowego filmu pasywnacyjnego charakterystycznego dla stali nierdzewnej konieczne jest przynajmniej 10,5% chromu. Ten film pasywny mo\u017ce skutecznie chroni\u0107 stal przed dzia\u0142aniem wody zanieczyszczonej substancjami korozyjnymi, r\u00f3\u017cnych roztwor\u00f3w kwasowych oraz nawet silnego utleniania w wyniku korozji gazowej w wysokich temperaturach. Warto\u015b\u0107 zawarto\u015bci chromu przekraczaj\u0105ca 10,5% zwi\u0119ksza odporno\u015b\u0107 stali nierdzewnej na korozj\u0119. Warto\u015b\u0107 zawarto\u015bci chromu w <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">304<\/a> Stal nierdzewna ma stopie\u0144 szlifowania 18%, a niekt\u00f3re wysoce jako\u015bciowe stalowe rodzaje stali austenitycznej maj\u0105 zawarto\u015b\u0107 chromu si\u0119gaj\u0105c\u0105 20% \u201328%.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Ni<\/strong><\/p>\n<p>Mied\u017a mo\u017ce tworzy\u0107 i stabilizowa\u0107 faz\u0119 austenitow\u0105. 8%Ni sprawia, \u017ce <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">Stal nierdzewna 304<\/a>daj\u0105c mu w\u0142a\u015bciwo\u015bci mechaniczne, wytrzyma\u0142o\u015b\u0107 i twardo\u015b\u0107 wymagane przez austenit. Wysokowydajne stali nierdzewne o strukturze austenitowej zawieraj\u0105 wysokie st\u0119\u017cenia chromu i molibdenu, a dodatkowo dodaje si\u0119 nikiel w celu utrzymania struktury austenitowej, gdy do stali dodaje si\u0119 wi\u0119cej chromu lub innych element\u00f3w tworz\u0105cych ferityn\u0119. Struktura austenitowa mo\u017ce by\u0107 zapewniona przy zawarto\u015bci niklu oko\u0142o 20%, a odporno\u015b\u0107 na \u015bciskanie i korozj\u0119 stali nierdzewnej mo\u017ce zosta\u0107 znacznie zwi\u0119kszona.<\/p>\n<p>Mied\u017a mo\u017ce r\u00f3wnie\u017c zmniejsza\u0107 tempo utwardzania podczas deformacji w niskich temperaturach, dlatego stopy stosowane do g\u0142\u0119bokiego wyt\u0142aczania, prz\u0119dzenia i obr\u00f3bki w niskich temperaturach zwykle maj\u0105 wysoki zawarto\u015b\u0107 miedzi.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Mo<\/strong><\/p>\n<p>Molibden poprawia odporno\u015b\u0107 na korozj\u0119 wg\u0142\u0119bienn\u0105 i szczelinow\u0105 stali nierdzewnej w \u015brodowisku chlorkowym. Po\u0142\u0105czenie molibdenu z chromem, zw\u0142aszcza azotem, sprawia, \u017ce wysokowydajna stal austenityczna ma siln\u0105 odporno\u015b\u0107 na korozj\u0119 wg\u0142\u0119bienn\u0105 i szczelinow\u0105. Molibden mo\u017ce r\u00f3wnie\u017c poprawi\u0107 odporno\u015b\u0107 na korozj\u0119 stali nierdzewnej w \u015brodowiskach redukcyjnych, takich jak kwas chlorowodorowy i rozcie\u0144czony kwas siarkowy. Minimalna zawarto\u015b\u0107 molibdenu w stali austenitycznej jest oko\u0142o 2%, np. w stali nierdzewnej 316. Wysoce wydajne stalowe stali austenityczne o najwy\u017cszym zawarto\u015bci stopu zawieraj\u0105 do 7,5% molibdenu. Molibden przyczynia si\u0119 do tworzenia fazy ferritowej i wp\u0142ywa na r\u00f3wnowag\u0119 fazow\u0105. Wp\u0142ywa na tworzenie kilku szkodliwych faz wt\u00f3rnych i tworzy niestabilne tlenki o wysokiej temperaturze, co ma negatywny wp\u0142yw na odporno\u015b\u0107 na wysokotemperaturow\u0105 utlenianie. U\u017cycie stali nierdzewnej zawieraj\u0105cej molibden musi by\u0107 uwzgl\u0119dnione.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>C<\/strong><\/p>\n<p>W\u0119giel stabilizuje i wzmacnia faz\u0119 austenitow\u0105. W\u0119giel jest korzystnym elementem dla stali nierdzewnej stosowanej w \u015brodowiskach o wysokiej temperaturze, takich jak rury kot\u0142owe, ale w niekt\u00f3rych przypadkach mo\u017ce mie\u0107 szkodliwy wp\u0142yw na odporno\u015b\u0107 na korozj\u0119. Zawarto\u015b\u0107 w\u0119gla w wi\u0119kszo\u015bci stali nierdzewnych typu austenitowego jest zwykle ograniczona do najni\u017cszego dopuszczalnego poziomu. Zawarto\u015b\u0107 w\u0119gla w gatunkach do spawania (<a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">304L<\/a>Zawarto\u015b\u0107 w\u0119gla w stali nierdzewnej o wysokiej wytrzyma\u0142o\u015bci (np. 201L i 316L) jest ograniczona do 0,030%. Zawarto\u015b\u0107 w\u0119gla w niekt\u00f3rych wysokowydajnych gatunkach stali z dodatkiem stop\u00f3w jest nawet ograniczona do 0,020%.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>N<\/strong><\/p>\n<p>Azot stabilizuje i wzmacnia faz\u0119 austenityczn\u0105 oraz spowalnia proces senzityzacji w\u0119glika oraz tworzenia faz wt\u00f3rnych. Standardowe austenityczne stalowe rodzaje stali nierdzewnej oraz wysokowydajne austenityczne rodzaje stali nierdzewnej zawieraj\u0105 azot. W niskow\u0119glowych gatunkach stali (L) niewielka ilo\u015b\u0107 azotanu (do 0,1%) mo\u017ce zrekompensowa\u0107 utrat\u0119 wytrzyma\u0142o\u015bci zwi\u0105zanych z nisk\u0105 zawarto\u015bci\u0105 w\u0119gla. Azot wspomaga r\u00f3wnie\u017c zwi\u0119kszenie odporno\u015bci na korozj\u0119 chlorowodorkow\u0105 i korozj\u0119 szczelinow\u0105, dlatego niekt\u00f3re z najlepszych stali nierdzewnych o wysokich parametrach korozyjnych s\u0105 wyposa\u017cone w azot w ilo\u015bci do 0,5%.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Mn<\/strong><\/p>\n<p>Stalownie wykorzystuj\u0105 mangan do odoksydacji stopionego stali, wi\u0119c niewielka ilo\u015b\u0107 manganu pozostaje w ca\u0142ej stali nierdzewnej. Mangan mo\u017ce r\u00f3wnie\u017c stabilizowa\u0107 faz\u0119 austenitow\u0105 i poprawia\u0107 rozpuszczalno\u015b\u0107 azotu w stali nierdzewnej. Dlatego w stali nierdzewnej serii 200 mangan mo\u017ce by\u0107 u\u017cywany do zast\u0119powania cz\u0119\u015bci niklu w celu zwi\u0119kszenia zawarto\u015bci azotu oraz poprawy wytrzyma\u0142o\u015bci i odporno\u015bci na korozj\u0119. Mangan dodaje si\u0119 do niekt\u00f3rych wysokowydajnych stali nierdzewnych typu austenitowego, aby uzyska\u0107 taki sam efekt.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Cu<\/strong><\/p>\n<p>Mied\u017a mo\u017ce zwi\u0119kszy\u0107 odporno\u015b\u0107 na korozj\u0119 stali nierdzewnej w przypadku redukcji kwas\u00f3w, takich jak niekt\u00f3re mieszane roztwory kwasu siarkowego i fosforowego.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Si<\/strong><\/p>\n<p>Og\u00f3lnie rzecz bior\u0105c, krzem jest korzystnym elementem w stali nierdzewnej austenitowej, poniewa\u017c mo\u017ce poprawia\u0107 odporno\u015b\u0107 stali na korozj\u0119 w st\u0119\u017conych kwasach i w \u015brodowiskach o wysokiej zawarto\u015bci tlenu. Otrzymuje si\u0119 doniesienia, \u017ce stali nierdzewne specjalne o wysokim stopniu krzemieniaj\u0105cego si\u0119, takie jak UNS S30600, charakteryzuj\u0105 si\u0119 wysok\u0105 odporno\u015bci\u0105 na korozj\u0119 w postaci otwor\u00f3w. Krzem, podobnie jak mangan, mo\u017ce by\u0107 r\u00f3wnie\u017c stosowany do odtleniania stopionego stali, wi\u0119c niewielkie inkluzje tlenkowe zawieraj\u0105ce krzem, mangan i inne sk\u0142adniki odtleniaj\u0105ce zawsze pozostaj\u0105 w stali. Jednak zbyt wiele inkluzji wp\u0142ywa na jako\u015b\u0107 powierzchniowego wyko\u0144czenia produktu.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Nb i Ti<\/strong><\/p>\n<p>Te dwa elementy s\u0105 silnymi elementami tworz\u0105cymi w\u0119glik tytanowy i mog\u0105 by\u0107 stosowane zamiast gatunk\u00f3w o niskiej zawarto\u015bci w\u0119gla w celu zmniejszenia ryzyka wyst\u0105pienia reakcji senzitacyjnej. Karbid niobowy i karbid tytanowy mog\u0105 zwi\u0119kszy\u0107 wytrzyma\u0142o\u015b\u0107 w wysokich temperaturach. <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/347-347h-stainless-steel\/\">347<\/a> a stal nierdzewna typu 321 zawieraj\u0105ca Nb i Ti jest powszechnie stosowana w kot\u0142ach i urz\u0105dzeniach rafinacyjnych w celu spe\u0142nienia wymaga\u0144 dotycz\u0105cych wytrzyma\u0142o\u015bci i spawalno\u015bci w wysokich temperaturach. Stosowana jest r\u00f3wnie\u017c w niekt\u00f3rych procesach odtleniania jako pozosta\u0142o\u015bci w wysokowydajnych stalach nierdzewnych typu Austenitic.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>S i P<\/strong><\/p>\n<p>Siarka jest zar\u00f3wno korzystna, jak i szkodliwa dla stali nierdzewnej. Jej pozytywnym dzia\u0142aniem jest poprawa wydajno\u015bci obr\u00f3bki, jednak jej negatywnym skutkiem jest zmniejszenie odporno\u015bci termicznej stali, co zwi\u0119ksza liczb\u0119 inkluzji siarczanu manganu, co w konsekwencji wp\u0142ywa na zmniejszenie odporno\u015bci stali na korozj\u0119. Wy\u017cszej jako\u015bci stali nierdzewnej Austenitowej nie jest \u0142atwa do obr\u00f3bki cieplnej, dlatego zawarto\u015b\u0107 siarki powinna by\u0107 utrzymywana na jak najni\u017cszym poziomie, oko\u0142o 0,001%. Siarka zwykle nie jest dodawana jako element stopowy do wysokowydajnych stali nierdzewnych typu Austenitowe. Jednak zawarto\u015b\u0107 siarki w standardowych gatunkach stali nierdzewnej jest cz\u0119sto wysoka (0,005% ~ 0,017%), co ma na celu zwi\u0119kszenie g\u0142\u0119boko\u015bci penetracji spoin w procesie spawania samodosk\u0142adowego oraz popraw\u0119 wydajno\u015bci ci\u0119cia.<\/p>\n<p>Fosfor jest szkodliwym elementem i mo\u017ce negatywnie wp\u0142ywa\u0107 na w\u0142a\u015bciwo\u015bci termiczne formowania i walcowania na gor\u0105co. W procesie ch\u0142odzenia po spawaniu przyczynia si\u0119 ono r\u00f3wnie\u017c do wyst\u0105pienia p\u0119kni\u0119\u0107 termicznych. Dlatego zawarto\u015b\u0107 fosforu powinna by\u0107 utrzymywana na minimalnym poziomie.<\/p>","protected":false},"excerpt":{"rendered":"<p>Chemical composition has a great influence on the microstructure, mechanical properties, physical properties and corrosion resistance of steel. Chromium, molybdenum, nickel and other alloying elements can replace the vertex Angle of the austenite lattice and the center of the six sides of the cube iron, carbon and nitrogen are located in the gap between the [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2210,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"WLD Stainless\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/wldstainless.com\/pl\/how-the-alloying-element-affect-the-stainless-steel\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/wldstainless.com\\\/pl\\\/how-the-alloying-element-affect-the-stainless-steel\\\/#article\",\"name\":\"How the alloying element affect the stainless steel? 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