{"id":2237,"date":"2021-08-06T06:41:21","date_gmt":"2021-08-06T06:41:21","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2237"},"modified":"2021-08-06T06:41:21","modified_gmt":"2021-08-06T06:41:21","slug":"is-318ln-a-type-duplex-stainless-steel-grades","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/nl\/is-318ln-a-type-duplex-stainless-steel-grades\/","title":{"rendered":"Is 318LN een type duplex roestvrij staal?"},"content":{"rendered":"<p>318LN is roestvrij staal met een verhoogde hoeveelheid stikstof en wordt vaak gebruikt om corrosieproblemen bij roestvrij staal van de 300-serie aan te pakken. De structuur van 318LN roestvrij staal bestaat uit austeniet, omringd door continue ferrietfasen. 318LN bevat ongeveer 40% -50 ferriet in de gehamerde toestand en kan worden beschouwd als duplex roestvrij staal. De duplexstructuur combineert ferrietlegeringen (weerstand tegen stresscorrosie en hoge sterkte) met de superieure eigenschappen van austenitische legeringen (gemakkelijke vervaardiging en corrosieweerstand). 318LN is bestand tegen uniforme corrosie door H2S, sulfidestresscracking, waterstofbreukbaarheid en pitting en tegen corrosie door verwerkingsmedia. Het wordt vaak gebruikt om zwavelbestendige putkoppen, kleppen, staven en bevestigingsmiddelen te produceren voor gebruik in mijnbouwomgevingen waar de partijdruk van H2S hoger is dan 1 MPa. Het gebruik van 318LN dubbelwandig roestvrij staal moet echter beperkt blijven tot minder dan 600\u00b0F omdat langdurige hoge temperaturen het 318LN roestvrij staal kunnen kraken.<\/p>\n<p>&nbsp;<\/p>\n<h3>De chemische samenstelling van staal 318LN<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"94\">Cr<\/td>\n<td width=\"94\">Ni<\/td>\n<td width=\"94\">Mo<\/td>\n<td width=\"94\">C<\/td>\n<td width=\"94\">N<\/td>\n<td width=\"94\">Mn<\/td>\n<td width=\"94\">Si<\/td>\n<td width=\"94\">P<\/td>\n<td width=\"94\">S<\/td>\n<\/tr>\n<tr>\n<td width=\"94\">22.0-23.0<\/td>\n<td width=\"94\">4.50-6.50<\/td>\n<td width=\"94\">3.00-3.50<\/td>\n<td width=\"94\">\u22640.030<\/td>\n<td width=\"94\">0.14-0.20<\/td>\n<td width=\"94\">\u22642.00<\/td>\n<td width=\"94\">\u22641.00<\/td>\n<td width=\"94\">\u22640.030<\/td>\n<td width=\"94\">\u22640.020<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td colspan=\"4\" width=\"852\">Mechanische eigenschappen<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Ys (Mpa)<\/td>\n<td width=\"213\">Ts (Mpa)<\/td>\n<td width=\"213\">Uitrekbaarheid (%)<\/td>\n<td width=\"213\">Hv<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Normen<\/td>\n<td width=\"213\">\u2265 450<\/td>\n<td width=\"213\">\u2265 620<\/td>\n<td width=\"213\">\u2265 18<\/td>\n<\/tr>\n<tr>\n<td colspan=\"4\" width=\"852\">Fysieke eigenschappen<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Dichtheid (g\/cm)<\/td>\n<td width=\"213\">Specifieke warmte(J\/g.C)<\/td>\n<td width=\"213\">Thermische geleidbaarheid<\/p>\n<p>100C (W\/m.)<\/td>\n<td width=\"213\">De co\u00ebffici\u00ebnt van thermische uitzetting<\/p>\n<p>20~100C (10\/C)<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">7.8<\/td>\n<td width=\"213\">0.45<\/td>\n<td width=\"213\">19.0<\/td>\n<td width=\"213\">13.7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Kenmerken van 318LNstaal<\/h3>\n<ul>\n<li>Uitstekende weerstand tegen sulfidestresscorrosie<\/li>\n<li>Goede resistentie tegen chloride-stresscorrosie, pitting en crevicecorrosie<\/li>\n<li>Hoge sterkte,<\/li>\n<li>Goede lasbaarheid en bewerkbaarheid<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Toepassingen van 318LNstaal<\/h3>\n<ul>\n<li>Containers voor chemische behandeling, leidingen en warmtewisselaars<\/li>\n<li>Pulpfabriekstrogers, bleekzuurreinigers, containers voor voorverwarmen van de chips<\/li>\n<li>Eigendomsrecht op voedselverwerkingsapparatuur<\/li>\n<li>Petrochemische pijpleidingen en warmtewisselaars<\/li>\n<li>Uitlaatgassafscherming<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>318LN dubbelwandig roestvrij staal is een economische en effectieve oplossing voor toepassingen waar roestvrij staal uit de 300-serie gevoelig is voor chloride-stresscorrosie. Wanneer roestvrij staal wordt onderworpen aan trekspanning, zal er stresscorrosie ontstaan bij contact met een oplossing die chloride bevat. Een stijgende temperatuur verhoogt ook de gevoeligheid van roestvrij staal voor stresscorrosie. De combinatie van chroom, molybdeen en stikstof verbetert de weerstand van 318LN tegen chloride-pit en scheurcorrosie, wat cruciaal is voor toepassingen zoals mariene omgevingen, brak water, bleekingsprocessen, gesloten watercirculatiesystemen en bepaalde voedselverwerkingsprocessen. In de meeste omgevingen biedt het hoge chroom-, molybdeen- en stikstofgehalte van 318LN een superieure corrosieweerstand in vergelijking met gewone roestvrijstalen materialen zoals <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/316-316l-stainless-steel\/\">316L<\/a> en 317L.<\/p>","protected":false},"excerpt":{"rendered":"<p>318LN is Nitrogen-enhanced stainless steel commonly used to address corrosion failures in 300 series stainless steel. The structure of 318LN stainless steel is composed of Austenite surrounded by continuous Ferrite phases. 318LN contains about 40-50% Ferrite in the annealed state and can be considered duplex stainless steel. The duplex structure combines ferrite alloys (stress corrosion [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2237","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"318LN duplex stainless steel is an economical and effective solution for applications where 300 series stainless steels are susceptible to chloride stress corrosion cracking.\" \/>\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\/nl\/is-318ln-a-type-duplex-stainless-steel-grades\/\" \/>\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\\\/nl\\\/is-318ln-a-type-duplex-stainless-steel-grades\\\/#article\",\"name\":\"Is 318LN a type duplex stainless steel grades? 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