{"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\/cs\/is-318ln-a-type-duplex-stainless-steel-grades\/","title":{"rendered":"Je 318LN typ duplexn\u00ed nerezov\u00e9 oceli?"},"content":{"rendered":"<p>318LN je dus\u00edkem obohacen\u00e1 nerezov\u00e1 ocel b\u011b\u017en\u011b pou\u017e\u00edvan\u00e1 k \u0159e\u0161en\u00ed korozn\u00edch poruch v nerezov\u00e9 oceli \u0159ady 300. Struktura nerezov\u00e9 oceli 318LN se skl\u00e1d\u00e1 z austenitu obklopen\u00e9ho spojit\u00fdmi feritov\u00fdmi f\u00e1zemi. 318LN obsahuje asi 40-50% ferit v \u017e\u00edhan\u00e9m stavu a lze jej pova\u017eovat za duplexn\u00ed nerezovou ocel. Duplexn\u00ed struktura kombinuje feritov\u00e9 slitiny (odolnost proti prask\u00e1n\u00ed koroz\u00ed pod nap\u011bt\u00edm a vysok\u00e1 pevnost) s vynikaj\u00edc\u00edmi kvalitami austenitick\u00fdch slitin (snadn\u00e1 v\u00fdroba a odolnost proti korozi). 318LN je odoln\u00fd v\u016f\u010di rovnom\u011brn\u00e9 korozi H2S, prask\u00e1n\u00ed sulfidov\u00fdm nam\u00e1h\u00e1n\u00edm, vod\u00edkov\u00e9 k\u0159ehnut\u00ed a d\u016flkov\u00e9 korozi a sni\u017euje korozi m\u00e9di\u00ed. B\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 k v\u00fdrob\u011b \u00fast\u00ed vrt\u016f, ventil\u016f, d\u0159\u00edk\u016f a upev\u0148ovac\u00edch prvk\u016f odoln\u00fdch v\u016f\u010di s\u00ed\u0159e pro pou\u017eit\u00ed v d\u016fln\u00edch prost\u0159ed\u00edch, kde parci\u00e1ln\u00ed tlaky H2S p\u0159esahuj\u00ed 1 MPa. Pou\u017eit\u00ed duplexn\u00ed nerezov\u00e9 oceli 318LN by v\u0161ak m\u011blo b\u00fdt omezeno na m\u00e9n\u011b ne\u017e 600 \u00b0F, proto\u017ee dlouhodob\u00e9 vysok\u00e9 teploty mohou nerezovou ocel 318LN zk\u0159ehnout.<\/p>\n<p>&nbsp;<\/p>\n<h3>Chemick\u00e9 slo\u017een\u00ed oceli 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\">Mechanick\u00e1 vlastnost<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Ys (Mpa)<\/td>\n<td width=\"213\">Ts (Mpa)<\/td>\n<td width=\"213\">Prodlou\u017een\u00ed (%)<\/td>\n<td width=\"213\">Hv<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Normy<\/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\">Fyzick\u00e9 vlastnosti<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Hustota (g\/cm)<\/td>\n<td width=\"213\">Specifick\u00e9 teplo (J\/gC)<\/td>\n<td width=\"213\">Tepeln\u00e1 vodivost<\/p>\n<p>100C (W\/m.)<\/td>\n<td width=\"213\">Sou\u010dinitel tepeln\u00e9 rozta\u017enosti<\/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>Vlastnosti oceli 318LN<\/h3>\n<ul>\n<li>Vynikaj\u00edc\u00ed odolnost v\u016f\u010di sulfidov\u00e9 nap\u011b\u0165ov\u00e9 korozi<\/li>\n<li>Dobr\u00e1 odolnost proti chloridov\u00e9 korozn\u00edmu prask\u00e1n\u00ed, d\u016flkov\u00e9 a \u0161t\u011brbinov\u00e9 korozi<\/li>\n<li>Vysok\u00e1 s\u00edla,<\/li>\n<li>Dobr\u00e1 sva\u0159itelnost a zpracovatelnost<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Aplikace oceli 318LN<\/h3>\n<ul>\n<li>Chemick\u00e9 n\u00e1doby, potrub\u00ed a v\u00fdm\u011bn\u00edky tepla<\/li>\n<li>Digestory buni\u010diny, b\u011blic\u00ed \u010disti\u010de, p\u0159edpa\u0159ovac\u00ed n\u00e1doby na t\u0159\u00edsky<\/li>\n<li>Za\u0159\u00edzen\u00ed na zpracov\u00e1n\u00ed potravin<\/li>\n<li>Petrochemick\u00e1 potrub\u00ed a v\u00fdm\u011bn\u00edky tepla<\/li>\n<li>Za\u0159\u00edzen\u00ed na odsi\u0159ov\u00e1n\u00ed spalin<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Duplexn\u00ed nerezov\u00e1 ocel 318LN je ekonomick\u00e9 a efektivn\u00ed \u0159e\u0161en\u00ed pro aplikace, kde nerezov\u00e1 ocel \u0159ady 300 je citliv\u00e1 na chloridov\u00e9 korozn\u00ed prask\u00e1n\u00ed. Kdy\u017e je nerezov\u00e1 ocel vystavena tahov\u00e9mu nam\u00e1h\u00e1n\u00ed, dojde p\u0159i kontaktu s roztokem obsahuj\u00edc\u00edm chlorid ke korozn\u00edmu prask\u00e1n\u00ed pod nap\u011bt\u00edm a rostouc\u00ed teplota tak\u00e9 zv\u00fd\u0161\u00ed citlivost nerezov\u00e9 oceli na korozn\u00ed prask\u00e1n\u00ed pod nap\u011bt\u00edm. Kombinace chr\u00f3mu, molybdenu a dus\u00edku zvy\u0161uje odolnost 318LN v\u016f\u010di chloridov\u00e9 d\u016flkov\u00e9 a \u0161t\u011brbinov\u00e9 korozi, co\u017e je z\u00e1sadn\u00ed pro slu\u017eby, jako je mo\u0159sk\u00e9 prost\u0159ed\u00ed, brakick\u00e1 voda, b\u011blic\u00ed operace, vodn\u00ed syst\u00e9my s uzav\u0159en\u00fdm okruhem a n\u011bkter\u00e9 aplikace zpracov\u00e1n\u00ed potravin. Ve v\u011bt\u0161in\u011b prost\u0159ed\u00ed poskytuje 318LN vysok\u00fd obsah chr\u00f3mu, molybdenu a dus\u00edku vynikaj\u00edc\u00ed odolnost proti korozi oproti b\u011b\u017en\u00fdm nerezov\u00fdm ocel\u00edm, jako je nap\u0159. <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/316-316l-stainless-steel\/\">316L<\/a> a 317 l.<\/p>","protected":false},"excerpt":{"rendered":"<p>318LN je dus\u00edkem obohacen\u00e1 nerezov\u00e1 ocel b\u011b\u017en\u011b pou\u017e\u00edvan\u00e1 k \u0159e\u0161en\u00ed korozn\u00edch poruch v nerezov\u00e9 oceli \u0159ady 300. Struktura nerezov\u00e9 oceli 318LN se skl\u00e1d\u00e1 z austenitu obklopen\u00e9ho spojit\u00fdmi feritov\u00fdmi f\u00e1zemi. 318LN obsahuje asi 40-50% ferit v \u017e\u00edhan\u00e9m stavu a lze jej pova\u017eovat za duplexn\u00ed nerezovou ocel. Duplexn\u00ed struktura kombinuje feritov\u00e9 slitiny (nap\u011b\u0165ov\u00e1 koroze [\u2026]<\/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":[],"_links":{"self":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/comments?post=2237"}],"version-history":[{"count":1,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2237\/revisions"}],"predecessor-version":[{"id":2238,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2237\/revisions\/2238"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media?parent=2237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/categories?post=2237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/tags?post=2237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}