{"id":2073,"date":"2021-01-14T08:58:02","date_gmt":"2021-01-14T08:58:02","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2073"},"modified":"2021-01-14T08:58:02","modified_gmt":"2021-01-14T08:58:02","slug":"whats-the-difference-between-316l-and-904l-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/cs\/whats-the-difference-between-316l-and-904l-steel\/","title":{"rendered":"Jak\u00fd je rozd\u00edl mezi ocel\u00ed 316L a 904L?"},"content":{"rendered":"

B\u011b\u017en\u011b zn\u00e1m\u00e1 jako "l\u00e9ka\u0159sk\u00e1 ocel", 316L<\/span> <\/em><\/a>nerezov\u00e1 ocel se pou\u017e\u00edv\u00e1 nejen k v\u00fdrob\u011b \u0161perk\u016f a l\u00e9ka\u0159sk\u00fdch skalpel\u016f kv\u016fli jej\u00edm n\u00edzk\u00fdm alergenn\u00edm vlastnostem, ale tak\u00e9 ji pou\u017e\u00edvaj\u00ed spole\u010dnosti vyr\u00e1b\u011bj\u00edc\u00ed hodinky k v\u00fdrob\u011b p\u00e1sk\u016f. Nerezov\u00e1 ocel 904L je austenitick\u00e1 nerezov\u00e1 ocel vyroben\u00e1 spole\u010dnost\u00ed Outokumpu<\/strong> Spole\u010dnost ve Finsku zalo\u017een\u00e1 na nerezov\u00e9 oceli 316L je super austenit s n\u00edzk\u00fdm obsahem uhl\u00edku a vysoce legov\u00e1n\u00edm navr\u017een\u00fd pro korozivn\u00ed prost\u0159ed\u00ed, jako je z\u0159ed\u011bn\u00e1 kyselina s\u00edrov\u00e1.<\/p>\n

Nerezov\u00e1 ocel 904L zvy\u0161uje obsah chr\u00f3mu, niklu a molybdenu a p\u0159id\u00e1v\u00e1 ur\u010dit\u00e9 mno\u017estv\u00ed m\u011bdi, co\u017e p\u0159inese zm\u011bnu v\u00fdkonu, d\u00edky \u010demu\u017e je nerezov\u00e1 ocel 904L odoln\u011bj\u0161\u00ed proti opot\u0159eben\u00ed a korozi, ale z\u00e1rove\u0148 nen\u00ed mezi nimi velk\u00fd rozd\u00edl v tvrdosti, uka\u017eme si jejich rozd\u00edl s tabulkou n\u00ed\u017ee:<\/p>\n\n\n\n\n\n
Zn\u00e1mky<\/td>\nC<\/td>\nSi<\/td>\nMn<\/td>\nCr<\/td>\nNi<\/td>\nMo<\/td>\nP<\/td>\nS<\/td>\nCu<\/td>\n<\/tr>\n
316L<\/td>\n\u22640,03<\/td>\n\u22640,1<\/td>\n\u22640,2<\/td>\n16-18<\/td>\n10-14<\/td>\n2-3<\/td>\n\u22640,04<\/td>\n\u22640,03<\/td>\n\/<\/td>\n<\/tr>\n
904L<\/a><\/td>\n\u22640,02<\/td>\n\u22640,1<\/td>\n\u22640,2<\/td>\n19-23<\/td>\n23-28<\/td>\n4-5<\/td>\n\u22640,04<\/td>\n\u22640,03<\/td>\n1-2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Nen\u00ed t\u011b\u017ek\u00e9 to vid\u011bt 904L<\/em> <\/a>slitinov\u00e9 prvky chrom, nikl, molybden je v\u00edce ne\u017e 1,6kr\u00e1t vy\u0161\u0161\u00ed ne\u017e u nerezov\u00e9 oceli 316L, m\u011b\u010f 1%-2% \u010din\u00ed nerezovou ocel 904L siln\u011bj\u0161\u00ed odolnost proti korozi a opot\u0159eben\u00ed ne\u017e nerezov\u00e1 ocel 316L. 904 m\u00e1 ni\u017e\u0161\u00ed obsah uhl\u00edku (C), tak\u017ee le\u0161t\u011bn\u00e1 ocelov\u00e1 trubka nebo ocelov\u00fd plech 904L m\u00e1 lep\u0161\u00ed povrch a stejn\u00fd objem nerezov\u00e9 oceli 904L je mnohem t\u011b\u017e\u0161\u00ed ne\u017e nerezov\u00e1 ocel 316L. Jejich pevnost podle Rockwella (HRB) je men\u0161\u00ed ne\u017e 95 a pevnost je t\u00e9m\u011b\u0159 490 MPa. Je tedy zcela myln\u00e9 tvrdit, \u017ee nerezov\u00e1 ocel 904L je tvrd\u0161\u00ed ne\u017e nerezov\u00e1 ocel 316L.<\/p>\n

Rolex byla prvn\u00ed spole\u010dnost\u00ed, kter\u00e1 dala 904L do v\u00fdroby hodinek. V roce 1985 Rolex vyrobil pouzdro hodinek vyroben\u00e9 z oceli 904L, kter\u00e9 nahradilo ocel 316L. Ocel 904L obsahuje v\u00edce chromu, kter\u00fd napom\u00e1h\u00e1 k vytvo\u0159en\u00ed korozivzdorn\u00e9ho povlaku na povrchu kovov\u00fdch materi\u00e1l\u016f. A \u201eantikorozn\u00ed\u201c je tak\u00e9 v\u00fdhodou hodinek Rolex, o kter\u00fdch se \u010dasto zmi\u0148ujeme, ale zde \u201eantikorozn\u00ed\u201c nem\u00e1 praktick\u00fd v\u00fdznam, proto\u017ee oceli 316L zcela sta\u010d\u00ed ka\u017edodenn\u00ed koroze. Ocel 904L je skute\u010dn\u011b lep\u0161\u00ed v odolnosti proti korozi ne\u017e Ocel 316L<\/em><\/a>, ale to neznamen\u00e1, \u017ee ocel 316L nen\u00ed dobr\u00e1. Pro spot\u0159ebitele je jako materi\u00e1l pouzdra hodinek \u201epropagandistick\u00fd\u201c efekt oceli 904L lep\u0161\u00ed ne\u017e skute\u010dn\u00e1 role samotn\u00e9 \u201eantikoroze\u201c.<\/p>\n

Nejen v hodin\u00e1\u0159sk\u00e9m pr\u016fmyslu vykazuj\u00ed chemick\u00e9 obory v\u00edce v\u00fdhod. 904L nab\u00edz\u00ed lep\u0161\u00ed odolnost proti korozi ne\u017e 316L a dokonce 317L. P\u0159\u00eddavek m\u011bdi 1.5% m\u00e1 vynikaj\u00edc\u00ed odolnost proti korozi v\u016f\u010di redukuj\u00edc\u00edm kyselin\u00e1m, jako je kyselina s\u00edrov\u00e1 a kyselina fosfore\u010dn\u00e1, a m\u00e1 tak\u00e9 vynikaj\u00edc\u00ed odolnost v\u016f\u010di mezikrystalov\u00e9 korozi v\u016f\u010di korozi pod nap\u011bt\u00edm, d\u016flkov\u00e9 korozi a \u0161t\u011brbinov\u00e9 korozi zp\u016fsoben\u00e9 chloridov\u00fdmi ionty. V koncentra\u010dn\u00edm rozsahu 0-98% \u010dist\u00e9 kyseliny s\u00edrov\u00e9 lze 904L pou\u017e\u00edt p\u0159i teplot\u00e1ch do 40 \u2103. Ze v\u0161ech kyselin fosfore\u010dn\u00fdch je 904L odoln\u011bj\u0161\u00ed v\u016f\u010di korozi ne\u017e b\u011b\u017en\u00e1 nerezov\u00e1 ocel. B\u011b\u017en\u00e9 austenitick\u00e9 korozivzdorn\u00e9 oceli mohou b\u00fdt citliv\u00e9 na korozi pod nap\u011bt\u00edm p\u0159i teplot\u00e1ch nad 60 \u00b0C v prost\u0159ed\u00ed bohat\u00e9m na chloridy a tuto citlivost lze sn\u00ed\u017eit zv\u00fd\u0161en\u00edm obsahu niklu v korozivzdorn\u00fdch ocel\u00edch. D\u00edky vysok\u00e9mu obsahu niklu je 904L vysoce odoln\u00fd v\u016f\u010di prask\u00e1n\u00ed koroz\u00ed pod nap\u011bt\u00edm v roztoc\u00edch chlorid\u016f, koncentrovan\u00fdch roztoc\u00edch hydroxid\u016f a v prost\u0159ed\u00edch bohat\u00fdch na sirovod\u00edk.<\/p>","protected":false},"excerpt":{"rendered":"

Nerezov\u00e1 ocel 316L, b\u011b\u017en\u011b zn\u00e1m\u00e1 jako \u201el\u00e9ka\u0159sk\u00e1 ocel\u201c, se nepou\u017e\u00edv\u00e1 pouze k v\u00fdrob\u011b \u0161perk\u016f a l\u00e9ka\u0159sk\u00fdch skalpel\u016f kv\u016fli sv\u00fdm n\u00edzk\u00fdm alergenn\u00edm vlastnostem, ale tak\u00e9 ji pou\u017e\u00edvaj\u00ed spole\u010dnosti vyr\u00e1b\u011bj\u00edc\u00ed hodinky k v\u00fdrob\u011b p\u00e1sk\u016f na hodinky. Nerezov\u00e1 ocel 904L je austenitick\u00e1 nerezov\u00e1 ocel vyroben\u00e1 spole\u010dnost\u00ed Outokumpu Company ve Finsku na b\u00e1zi nerezov\u00e9 oceli 316L, je super [\u2026]<\/p>","protected":false},"author":1,"featured_media":2074,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2073","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2073","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=2073"}],"version-history":[{"count":1,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2073\/revisions"}],"predecessor-version":[{"id":2075,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2073\/revisions\/2075"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media\/2074"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media?parent=2073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/categories?post=2073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/tags?post=2073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}