{"id":2114,"date":"2021-03-09T09:03:34","date_gmt":"2021-03-09T09:03:34","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2114"},"modified":"2021-03-09T12:46:29","modified_gmt":"2021-03-09T12:46:29","slug":"whats-18ni-maraging-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/cs\/whats-18ni-maraging-steel\/","title":{"rendered":"Co je 18Ni Maraging ocel?"},"content":{"rendered":"

Martenzitick\u00e1 ocel je druhem ultravysokopevnostn\u00ed oceli, je zalo\u017eena na bezuhl\u00edkov\u00e9m nebo ultran\u00edzko uhl\u00edkov\u00e9m Fe-Ni martenzitu jako matrici, kter\u00e1 zp\u016fsobuje st\u00e1rnut\u00ed kovov\u00fdch slou\u010denin, aby se vysr\u00e1\u017eely a tvrdly. Martenzitick\u00e9 oceli jakosti 18Ni(200), 18Ni(250) a 18Ni(300) s mez\u00ed kluzu 1400, 1700 a 1900 MPa byly z\u00edsk\u00e1ny spole\u010dnost\u00ed INCO p\u0159id\u00e1n\u00edm r\u016fzn\u00fdch obsah\u016f Co, Mo a Ti do Fe-Ni martenzitu. slitina vytvrzen\u00edm st\u00e1rnut\u00edm. 18Ni (200) a 18Ni (250) oceli<\/a> byly poprv\u00e9 aplikov\u00e1ny na pl\u00e1\u0161\u0165 raketov\u00e9ho motoru nebo n\u011bkter\u00e9 speci\u00e1ln\u00ed po\u017eadavky, kde je pot\u0159eba ultra vysok\u00e1 pevnost. Pevnost Maraging oceli nepoch\u00e1z\u00ed z uhl\u00edku, ale z precipitace intermetalick\u00fdch slou\u010denin. Ocel AISI 18Ni je reprezentativn\u00ed t\u0159\u00eddou Maraging oceli. Pevnost oceli v tahu lze rozd\u011blit na:<\/p>\n\n\n\n\n\n\n\n
AISI<\/strong><\/td>\n\u0160koln\u00ed zn\u00e1mka<\/strong><\/td>\nUNS<\/strong><\/td>\nGB<\/strong><\/td>\n<\/tr>\n
18Ni (200)<\/td>\nMaraging 200<\/td>\nK92810<\/td>\n00Ni18Co8Mo3TiAl<\/td>\n<\/tr>\n
18Ni (250)<\/td>\nMaraging 250<\/td>\nK92890<\/td>\n00Ni18Co8Mo5TiAl<\/td>\n<\/tr>\n
18Ni (300)<\/td>\nMaraging 300<\/td>\nK93120<\/td>\n00Ni18Co9Mo5TiAl<\/td>\n<\/tr>\n
18Ni (350)<\/td>\nMaraging 350<\/td>\nK93160<\/td>\n00Ni18Co12Mo4Ti2Al<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Chemick\u00e9 slo\u017een\u00ed 18Ni Maraging oceli (MIL-S-46850D)<\/h3>\n\n\n\n\n\n\n\n
Zn\u00e1mky<\/strong><\/td>\nC<\/strong><\/td>\nSi<\/strong><\/td>\nMn<\/strong><\/td>\nP<\/strong><\/td>\nS<\/strong><\/td>\nNi<\/strong><\/td>\nspol<\/strong><\/td>\nMo<\/strong><\/td>\nTi<\/strong><\/td>\nAl<\/strong><\/td>\n<\/tr>\n
Stupe\u0148 200<\/td>\n\u22640,03<\/td>\n\u22640,10<\/td>\n\u22640,10<\/td>\n\u22640,01<\/td>\n\u22640,01<\/td>\n17.0~19.0<\/td>\n8.0~9.0<\/td>\n3.0~3.5<\/td>\n0.15~0.25<\/td>\n0.05~0.15<\/td>\n<\/tr>\n
Stupe\u0148 250<\/td>\n\u22640,03<\/td>\n\u22640,10<\/td>\n\u22640,10<\/td>\n\u22640,01<\/td>\n\u22640,01<\/td>\n17.0~19.0<\/td>\n7.0~8.5<\/td>\n4.6~5.2<\/td>\n0.3~0.5<\/td>\n0.05~0.15<\/td>\n<\/tr>\n
T\u0159\u00edda 300<\/p>\n

&300A<\/td>\n

\u22640,03<\/td>\n\u22640,10<\/td>\n\u22640,10<\/td>\n\u22640,01<\/td>\n\u22640,01<\/td>\n18.0~19.0<\/td>\n8.5~9.5<\/td>\n4.6~5.2<\/td>\n0.5~0.8<\/td>\n0.05~0.15<\/td>\n<\/tr>\n
T\u0159\u00edda 350<\/td>\n\u22640,03<\/td>\n\u22640,10<\/td>\n\u22640,10<\/td>\n\u22640,01<\/td>\n\u22640,01<\/td>\n18.0~19.0<\/td>\n11.5~12.5<\/td>\n4.6~5.2<\/td>\n1.3~1.6<\/td>\n0.05~0.15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Po pevn\u00e9m rozpu\u0161t\u011bn\u00ed 18Ni ocel<\/a> tvo\u0159\u00ed martenzit s ultra n\u00edzk\u00fdm obsahem uhl\u00edku o tvrdosti 28~30HRC. Po o\u0161et\u0159en\u00ed st\u00e1rnut\u00edm doch\u00e1z\u00ed k vytvrzen\u00ed st\u00e1rnut\u00edm v d\u016fsledku rozpou\u0161t\u011bn\u00ed a vysr\u00e1\u017een\u00ed r\u016fzn\u00fdch intermetalick\u00fdch slou\u010denin. Tvrdost se m\u016f\u017ee zv\u00fd\u0161it a\u017e na 50 HRC. Vynikaj\u00edc\u00ed charakteristikou oceli 18Ni je, \u017ee m\u00e1 st\u00e1le dobrou hou\u017eevnatost a vysokou lomovou hou\u017eevnatost za podm\u00ednek ultra vysok\u00e9 pevnosti a vysok\u00e9 tvrdosti. Sou\u010dasn\u011b je to bez kalen\u00ed za studena, mal\u00e1 deformace tepeln\u00e9ho zpracov\u00e1n\u00ed p\u0159i st\u00e1rnut\u00ed, dobr\u00fd sva\u0159ovac\u00ed v\u00fdkon, povrch kov\u016f m\u016f\u017ee b\u00fdt nitrida\u010dn\u00ed.<\/p>\n

Martenzitick\u00e1 ocel 18Ni je perfektn\u00ed kombinac\u00ed vysok\u00e9 pevnosti a tvrdosti, dobr\u00e9 hou\u017eevnatosti a plasticity. Byl \u0161iroce pou\u017e\u00edv\u00e1n v letectv\u00ed, kosmonautice, p\u0159esn\u00fdch form\u00e1ch a dal\u0161\u00edch pr\u016fmyslov\u00fdch oborech, jako je pl\u00e1\u0161\u0165 raketov\u00e9ho motoru, pl\u00e1\u0161\u0165 rakety, vysokorychlostn\u00ed rota\u010dn\u00ed v\u00e1lec odst\u0159edivky uranu a dal\u0161\u00ed vysoce p\u0159esn\u00e9 nosn\u00e9 \u010d\u00e1sti materi\u00e1lu.<\/p>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":2080,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2114","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\/2114","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=2114"}],"version-history":[{"count":1,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2114\/revisions"}],"predecessor-version":[{"id":2115,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2114\/revisions\/2115"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media\/2080"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media?parent=2114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/categories?post=2114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/tags?post=2114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}