{"id":394,"date":"2026-09-07T16:30:00","date_gmt":"2026-09-07T14:30:00","guid":{"rendered":"https:\/\/www.matai.cz\/blog\/?p=394"},"modified":"2026-08-31T17:20:04","modified_gmt":"2026-08-31T15:20:04","slug":"din-14571-titanem-stabilizovana-nerez","status":"publish","type":"post","link":"https:\/\/www.matai.cz\/blog\/din-14571-titanem-stabilizovana-nerez\/","title":{"rendered":"Nerez 1.4571 (A4 s Ti): stabilizace, mezikrystalov\u00e1 koroze a svary"},"content":{"rendered":"<p>Materi\u00e1l <strong>1.4571<\/strong> (chemick\u00e9 ozna\u010den\u00ed <strong>X6CrNiMoTi17-12-2<\/strong>, americk\u00fd ekvivalent <strong>AISI 316Ti<\/strong>, UNS S31635) je austenitick\u00e1 chrom-nikl-molybdenov\u00e1 nerezov\u00e1 ocel <strong>stabilizovan\u00e1 titanem<\/strong>. Jde o titanem stabilizovanou variantu oceli 1.4401 (316), kter\u00e1 byla vyvinuta s jedin\u00fdm hlavn\u00edm c\u00edlem: v\u00fdrazn\u011b omezit riziko mezikrystalov\u00e9 koroze v sou\u010d\u00e1stech vystaven\u00fdch zv\u00fd\u0161en\u00fdm teplot\u00e1m nebo sva\u0159ov\u00e1n\u00ed. Pro n\u00e1kup\u010d\u00ed, projektanty a \u00fadr\u017eb\u00e1\u0159e je d\u016fle\u017eit\u00e9 v\u011bd\u011bt, kdy 1.4571 skute\u010dn\u011b p\u0159in\u00e1\u0161\u00ed v\u00fdhodu a kdy sta\u010d\u00ed b\u011b\u017en\u011bj\u0161\u00ed n\u00edzkouhl\u00edkov\u00e1 jakost 1.4404 (316L).<\/p>\n<h2>Chemick\u00e9 slo\u017een\u00ed 1.4571<\/h2>\n<p>Orienta\u010dn\u00ed chemick\u00e9 slo\u017een\u00ed podle normy EN je n\u00e1sleduj\u00edc\u00ed (hmotnostn\u00ed pod\u00edly). Hodnoty pro konkr\u00e9tn\u00ed \u0161ar\u017ei v\u017edy potvrzuje materi\u00e1lov\u00fd atest 3.1.<\/p>\n<table>\n<thead>\n<tr>\n<th>Prvek<\/th>\n<th>Obsah (hm. %)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Uhl\u00edk (C)<\/td>\n<td>max. 0,08<\/td>\n<\/tr>\n<tr>\n<td>K\u0159em\u00edk (Si)<\/td>\n<td>max. 1,0<\/td>\n<\/tr>\n<tr>\n<td>Mangan (Mn)<\/td>\n<td>max. 2,0<\/td>\n<\/tr>\n<tr>\n<td>Chrom (Cr)<\/td>\n<td>16,5 \u2013 18,5<\/td>\n<\/tr>\n<tr>\n<td>Nikl (Ni)<\/td>\n<td>10,5 \u2013 13,5<\/td>\n<\/tr>\n<tr>\n<td>Molybden (Mo)<\/td>\n<td>2,0 \u2013 2,5<\/td>\n<\/tr>\n<tr>\n<td>Titan (Ti)<\/td>\n<td>max. 0,70<\/td>\n<\/tr>\n<tr>\n<td>Fosfor (P)<\/td>\n<td>max. 0,045<\/td>\n<\/tr>\n<tr>\n<td>S\u00edra (S)<\/td>\n<td>max. 0,015<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Kl\u00ed\u010dov\u00fdm rozd\u00edlem oproti 1.4401 je p\u0159id\u00e1n\u00ed titanu. Molybden (2\u20132,5 %) zaji\u0161\u0165uje zv\u00fd\u0161enou odolnost proti bodov\u00e9 korozi, podobn\u011b jako u ostatn\u00edch ocel\u00ed \u0159ady 316.<\/p>\n<h2>Co znamen\u00e1 \u201estabilizace titanem\u201c<\/h2>\n<p>Austenitick\u00e9 nerezov\u00e9 oceli maj\u00ed tendenci p\u0159i del\u0161\u00edm oh\u0159evu v tzv. citliv\u00e9m teplotn\u00edm rozmez\u00ed (p\u0159ibli\u017en\u011b 425\u2013815 \u00b0C) tvo\u0159it na hranic\u00edch zrn precipit\u00e1ty karbidu chromu. Uhl\u00edk difunduje k hranic\u00edm zrn a v\u00e1\u017ee na sebe chrom, \u010d\u00edm\u017e v p\u0159ilehl\u00e9 oblasti vznikne p\u00e1smo s ochuzen\u00fdm obsahem chromu. Tato ochuzen\u00e1 m\u00edsta pak ztr\u00e1cej\u00ed pasiva\u010dn\u00ed schopnost a st\u00e1vaj\u00ed se n\u00e1chyln\u00fdmi ke korozi \u2014 jev se naz\u00fdv\u00e1 <strong>mezikrystalov\u00e1 koroze<\/strong> (historicky t\u00e9\u017e \u201erozpad svaru\u201c, weld decay).<\/p>\n<p>Titan m\u00e1 k uhl\u00edku vy\u0161\u0161\u00ed afinitu ne\u017e chrom. P\u0159i obsahu titanu \u0159\u00e1dov\u011b kolem 0,5 % (norma stanovuje vazbu na obsah uhl\u00edku, prakticky se uv\u00e1d\u00ed pom\u011br Ti\/C alespo\u0148 5) se uhl\u00edk p\u0159ednostn\u011b v\u00e1\u017ee na <strong>karbidy titanu (TiC)<\/strong>, respektive karbonitridy titanu. Chrom tak z\u016fst\u00e1v\u00e1 rozpu\u0161t\u011bn\u00fd v matrici a rozlo\u017een\u00fd rovnom\u011brn\u011b po cel\u00e9 struktu\u0159e. T\u00edm se p\u0159edch\u00e1z\u00ed vzniku karbid\u016f chromu na hranic\u00edch zrn a riziko mezikrystalov\u00e9 koroze kles\u00e1. Tomuto principu se \u0159\u00edk\u00e1 stabilizace.<\/p>\n<h2>Chov\u00e1n\u00ed svar\u016f 1.4571<\/h2>\n<p>Hlavn\u00ed praktick\u00e1 v\u00fdhoda titanem stabilizovan\u00e9 oceli se projev\u00ed pr\u00e1v\u011b u sva\u0159ovan\u00fdch konstrukc\u00ed. U nestabilizovan\u00fdch jakost\u00ed (nap\u0159. 1.4401) m\u016f\u017ee b\u00fdt tepeln\u011b ovlivn\u011bn\u00e1 oblast (TOO\/HAZ) v okol\u00ed svaru sensibilizov\u00e1na, co\u017e u silnost\u011bnn\u00fdch d\u00edl\u016f n\u011bkdy vy\u017eaduje rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed po sva\u0159ov\u00e1n\u00ed. U oceli 1.4571 titan br\u00e1n\u00ed precipitaci karbid\u016f chromu i p\u0159i pr\u016fchodu citliv\u00fdm teplotn\u00edm rozmez\u00edm, tak\u017ee tepeln\u011b ovlivn\u011bn\u00e1 oblast po sva\u0159ov\u00e1n\u00ed zpravidla neb\u00fdv\u00e1 sensibilizov\u00e1na.<\/p>\n<p>Z hlediska sva\u0159itelnosti jsou ale podle dostupn\u00fdch srovn\u00e1n\u00ed ob\u011b jakosti (1.4571 i 1.4404) prakticky rovnocenn\u011b sva\u0159iteln\u00e9 p\u0159i pou\u017eit\u00ed odpov\u00eddaj\u00edc\u00edch postup\u016f a vhodn\u00fdch p\u0159\u00eddavn\u00fdch materi\u00e1l\u016f. V\u00fdhoda stabilizace se uplatn\u00ed zejm\u00e9na tam, kde se po svaru nep\u0159edpokl\u00e1d\u00e1 rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed a kde d\u00edl pracuje za zv\u00fd\u0161en\u00fdch teplot.<\/p>\n<h2>Mechanick\u00e9 vlastnosti a teplotn\u00ed rozsah<\/h2>\n<p>Orienta\u010dn\u00ed mechanick\u00e9 a fyzik\u00e1ln\u00ed vlastnosti 1.4571 (p\u0159esn\u00e9 hodnoty v\u017edy dle atestu a stavu dod\u00e1vky \u2014 typicky stav rozpu\u0161t\u011bn\u00e9ho \u017e\u00edh\u00e1n\u00ed):<\/p>\n<ul>\n<li>Pevnost v tahu (Rm): p\u0159ibli\u017en\u011b 500\u2013700 N\/mm\u00b2<\/li>\n<li>Tvrdost: \u2264 215 HB<\/li>\n<li>Hustota: cca 8,0 kg\/dm\u00b3 p\u0159i 20 \u00b0C<\/li>\n<li>Pou\u017eitelnost za zv\u00fd\u0161en\u00fdch teplot: v\u00fdrobci uv\u00e1d\u011bj\u00ed provoz a\u017e do cca 550 \u00b0C; vhodn\u00e1 je rovn\u011b\u017e pro n\u00edzk\u00e9 teploty<\/li>\n<\/ul>\n<p>Pr\u00e1v\u011b <strong>vy\u0161\u0161\u00ed pevnost za zv\u00fd\u0161en\u00fdch teplot<\/strong> je dnes hlavn\u00edm racion\u00e1ln\u00edm d\u016fvodem, pro\u010d 1.4571 volit. Pokud se materi\u00e1lov\u00e1 zna\u010dka uv\u00e1d\u00ed v souvislosti se <a href=\"\/blog\/znaceni-nerez-spojovaciho-materialu\/\">zna\u010den\u00edm nerezov\u00e9ho spojovac\u00edho materi\u00e1lu<\/a>, spad\u00e1 1.4571 do skupiny korozivzdorn\u00fdch ocel\u00ed t\u0159\u00eddy A4 (molybden-legovan\u00e9).<\/p>\n<h2>1.4571 vs. 1.4404 (316L): kdy co volit<\/h2>\n<p>Existuje druh\u00e1 cesta, jak omezit mezikrystalovou korozi \u2014 sn\u00ed\u017eit obsah uhl\u00edku pod 0,03 %. Tak vznikla n\u00edzkouhl\u00edkov\u00e1 jakost 1.4404 (316L), kter\u00e1 v praxi dosahuje proti mezikrystalov\u00e9 korozi obdobn\u00e9 odolnosti jako stabilizovan\u00e1 1.4571. Korozn\u00ed chov\u00e1n\u00ed obou jakost\u00ed je obecn\u011b velmi podobn\u00e9; titanem stabilizovan\u00e1 1.4571 m\u00e1 podle n\u011bkter\u00fdch zdroj\u016f m\u00edrn\u011b vy\u0161\u0161\u00ed citlivost k bodov\u00e9 korozi.<\/p>\n<table>\n<thead>\n<tr>\n<th>Krit\u00e9rium<\/th>\n<th>1.4571 (316Ti)<\/th>\n<th>1.4404 (316L)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Princip ochrany proti MKK<\/td>\n<td>stabilizace titanem (TiC)<\/td>\n<td>n\u00edzk\u00fd uhl\u00edk (&lt; 0,03 %)<\/td>\n<\/tr>\n<tr>\n<td>Pevnost za vy\u0161\u0161\u00edch teplot<\/td>\n<td>vy\u0161\u0161\u00ed<\/td>\n<td>ni\u017e\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Vhodnost pro vysok\u00fd lesk \/ le\u0161t\u011bn\u00ed<\/td>\n<td>hor\u0161\u00ed (TiC ru\u0161\u00ed rovnom\u011brn\u00e9 le\u0161t\u011bn\u00ed)<\/td>\n<td>lep\u0161\u00ed, vhodn\u00e1 pro zrcadlov\u00fd povrch<\/td>\n<\/tr>\n<tr>\n<td>Obrobitelnost<\/td>\n<td>tvrd\u00e9 karbidy titanu zvy\u0161uj\u00ed opot\u0159eben\u00ed n\u00e1stroj\u016f, pomalej\u0161\u00ed \u0159ezn\u00e9 rychlosti<\/td>\n<td>p\u0159\u00edzniv\u011bj\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Celosv\u011btov\u00e1 dostupnost<\/td>\n<td>men\u0161\u00ed<\/td>\n<td>standardn\u00ed volba, \u0161iroce dostupn\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Praktick\u00e9 vod\u00edtko vypl\u00fdvaj\u00edc\u00ed z odborn\u00fdch srovn\u00e1n\u00ed: pro vodn\u00e9 korozn\u00ed prost\u0159ed\u00ed a aplikace p\u0159i b\u011b\u017en\u00fdch teplot\u00e1ch nep\u0159in\u00e1\u0161\u00ed volba 1.4571 oproti 1.4404 praktickou v\u00fdhodu. Volba 1.4571 je technicky od\u016fvodn\u011bn\u00e1 p\u0159edev\u0161\u00edm tam, kde je rozhoduj\u00edc\u00ed <strong>pevnost za zv\u00fd\u0161en\u00fdch teplot<\/strong> (typicky nad cca 350 \u00b0C). N\u011bkter\u00e9 technick\u00e9 p\u0159edpisy doporu\u010duj\u00ed stabilizovan\u00e9 jakosti i p\u0159i vy\u0161\u0161\u00edch koncentrac\u00edch chlorid\u016f (nap\u0159. n\u011bmeck\u00fd p\u0159edpis DWA-M 275 zmi\u0148uje koncentraci chlorid\u016f nad 100 mg\/l).<\/p>\n<p>Pokud \u0159e\u0161\u00edte volbu mezi b\u011b\u017enou A2 a molybdenovou A4 obecn\u011b, navazuje na toto t\u00e9ma srovn\u00e1n\u00ed <a href=\"\/blog\/nerez-a2-vs-a4\/\">nerez A2 vs. A4<\/a>. Komplexn\u00ed orientaci v jakostech a norm\u00e1ch nab\u00edz\u00ed n\u00e1\u0161 pil\u00ed\u0159 <a href=\"\/blog\/normy-a-materialy\/\">normy a materi\u00e1ly<\/a>.<\/p>\n<h2>Typick\u00e9 aplikace<\/h2>\n<p>D\u00edky kombinaci molybdenu (odolnost proti bodov\u00e9 korozi) a stabilizace titanem (odolnost proti MKK i za tepla) se 1.4571 osv\u011bd\u010duje v chemick\u00e9m a petrochemick\u00e9m pr\u016fmyslu, v za\u0159\u00edzen\u00edch pracuj\u00edc\u00edch za zv\u00fd\u0161en\u00fdch teplot, u n\u00e1dr\u017e\u00ed, tlakov\u00fdch komponent a potrubn\u00edch syst\u00e9m\u016f, kde se sva\u0159uje a kde po svaru nelze prov\u00e9st rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed. Ve form\u011b <a href=\"\/p\/srouby-kridlate-din316-a4\/\">spojovac\u00edho materi\u00e1lu z nerezov\u00e9 oceli 1.4571<\/a> se pou\u017e\u00edv\u00e1 tam, kde b\u011b\u017en\u00e1 A4 (1.4401\/1.4404) nedosta\u010duje pr\u00e1v\u011b kv\u016fli kombinaci tepeln\u00e9 z\u00e1t\u011b\u017ee a sva\u0159ov\u00e1n\u00ed v okol\u00ed spoje.<\/p>\n<p>U konkr\u00e9tn\u00edch spoj\u016f je vhodn\u00e9 materi\u00e1lovou jakost v\u017edy uv\u00e1d\u011bt v popt\u00e1vce a vy\u017e\u00e1dat si nerezov\u00fd spojovac\u00ed materi\u00e1l s atestem 3.1, kter\u00fd dolo\u017e\u00ed chemick\u00e9 slo\u017een\u00ed i mechanick\u00e9 vlastnosti dan\u00e9 \u0161ar\u017ee.<\/p>\n<h2>Shrnut\u00ed<\/h2>\n<p>Nerez 1.4571 (316Ti) je titanem stabilizovan\u00e1 molybdenov\u00e1 austenitick\u00e1 ocel t\u0159\u00eddy A4. Titan v\u00e1\u017ee uhl\u00edk do karbid\u016f TiC, \u010d\u00edm\u017e chr\u00e1n\u00ed proti mezikrystalov\u00e9 korozi i za tepla a v okol\u00ed svar\u016f. V mnoha b\u011b\u017en\u00fdch aplikac\u00edch za norm\u00e1ln\u00edch teplot je ov\u0161em korozn\u011b rovnocenn\u00e1 dostupn\u011bj\u0161\u00ed jakosti 1.4404 (316L); skute\u010dnou v\u00fdhodou 1.4571 je vy\u0161\u0161\u00ed pevnost a stabilita za zv\u00fd\u0161en\u00fdch teplot.<\/p>\n<h2>\u010cast\u00e9 dotazy<\/h2>\n<h3>Jak\u00fd je rozd\u00edl mezi 1.4571 a 1.4404?<\/h3>\n<p>Ob\u011b jsou molybdenov\u00e9 austenitick\u00e9 nerezi (typ 316) odoln\u00e9 proti mezikrystalov\u00e9 korozi. 1.4571 (316Ti) je stabilizovan\u00e1 titanem, kde\u017eto 1.4404 (316L) dosahuje t\u00e9\u017ee odolnosti sn\u00ed\u017een\u00fdm obsahem uhl\u00edku pod 0,03 %. Korozn\u011b jsou velmi podobn\u00e9; 1.4571 m\u00e1 nav\u00edc vy\u0161\u0161\u00ed pevnost za zv\u00fd\u0161en\u00fdch teplot.<\/p>\n<h3>Co je mezikrystalov\u00e1 koroze a jak j\u00ed titan br\u00e1n\u00ed?<\/h3>\n<p>P\u0159i oh\u0159evu zhruba 425\u2013815 \u00b0C se na hranic\u00edch zrn sr\u00e1\u017eej\u00ed karbidy chromu a okol\u00ed se ochud\u00ed o chrom, co\u017e sni\u017euje korozn\u00ed odolnost. Titan m\u00e1 k uhl\u00edku vy\u0161\u0161\u00ed afinitu ne\u017e chrom, v\u00e1\u017ee uhl\u00edk do karbid\u016f TiC a zabra\u0148uje tak vzniku karbid\u016f chromu na hranic\u00edch zrn.<\/p>\n<h3>Pat\u0159\u00ed 1.4571 do t\u0159\u00eddy A4?<\/h3>\n<p>Ano. Ocel 1.4571 je molybdenem legovan\u00e1 austenitick\u00e1 nerez, kter\u00e1 spad\u00e1 do skupiny korozivzdorn\u00fdch ocel\u00ed t\u0159\u00eddy A4 pou\u017e\u00edvan\u00fdch pro spojovac\u00ed materi\u00e1l do n\u00e1ro\u010dn\u011bj\u0161\u00edho korozn\u00edho prost\u0159ed\u00ed.<\/p>\n<h3>Do jak\u00e9 teploty lze 1.4571 pou\u017e\u00edt?<\/h3>\n<p>V\u00fdrobci uv\u00e1d\u011bj\u00ed provozn\u00ed pou\u017eit\u00ed a\u017e do p\u0159ibli\u017en\u011b 550 \u00b0C; ocel je vhodn\u00e1 i pro n\u00edzk\u00e9 teploty. Pr\u00e1v\u011b vy\u0161\u0161\u00ed pevnost a stabilita za zv\u00fd\u0161en\u00fdch teplot je hlavn\u00edm racion\u00e1ln\u00edm d\u016fvodem pro volbu 1.4571 oproti 1.4404.<\/p>\n<h3>Kdy se vyplat\u00ed 1.4571 m\u00edsto 1.4404?<\/h3>\n<p>Technicky je volba 1.4571 od\u016fvodn\u011bn\u00e1 zejm\u00e9na tam, kde je rozhoduj\u00edc\u00ed pevnost za zv\u00fd\u0161en\u00fdch teplot (typicky nad cca 350 \u00b0C) a kde se sva\u0159uje bez n\u00e1sledn\u00e9ho rozpou\u0161t\u011bc\u00edho \u017e\u00edh\u00e1n\u00ed. Pro vodn\u00e1 prost\u0159ed\u00ed za b\u011b\u017en\u00fdch teplot zpravidla nep\u0159in\u00e1\u0161\u00ed proti 1.4404 praktickou v\u00fdhodu.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nerez 1.4571 (316Ti) je titanem stabilizovan\u00e1 austenitick\u00e1 ocel. Vysv\u011btl\u00edme stabilizaci, odolnost proti mezikrystalov\u00e9 korozi a chov\u00e1n\u00ed svar\u016f.<\/p>\n","protected":false},"author":1,"featured_media":747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_matai_meta_desc":"Nerez 1.4571 (316Ti) je titanem stabilizovan\u00e1 austenitick\u00e1 ocel. Vysv\u011btl\u00edme stabilizaci, odolnost proti mezikrystalov\u00e9 korozi a chov\u00e1n\u00ed svar\u016f.","_matai_faq":"[{\"q\": \"Jak\u00fd je rozd\u00edl mezi 1.4571 a 1.4404?\", \"a\": \"Ob\u011b jsou molybdenov\u00e9 austenitick\u00e9 nerezi (typ 316) odoln\u00e9 proti mezikrystalov\u00e9 korozi. 1.4571 (316Ti) je stabilizovan\u00e1 titanem, kde\u017eto 1.4404 (316L) dosahuje t\u00e9\u017ee odolnosti sn\u00ed\u017een\u00fdm obsahem uhl\u00edku pod 0,03 %. Korozn\u011b jsou velmi podobn\u00e9; 1.4571 m\u00e1 nav\u00edc vy\u0161\u0161\u00ed pevnost za zv\u00fd\u0161en\u00fdch teplot.\"}, {\"q\": \"Co je mezikrystalov\u00e1 koroze a jak j\u00ed titan br\u00e1n\u00ed?\", \"a\": \"P\u0159i oh\u0159evu zhruba 425\u2013815 \u00b0C se na hranic\u00edch zrn sr\u00e1\u017eej\u00ed karbidy chromu a okol\u00ed se ochud\u00ed o chrom, co\u017e sni\u017euje korozn\u00ed odolnost. Titan m\u00e1 k uhl\u00edku vy\u0161\u0161\u00ed afinitu ne\u017e chrom, v\u00e1\u017ee uhl\u00edk do karbid\u016f TiC a zabra\u0148uje tak vzniku karbid\u016f chromu na hranic\u00edch zrn.\"}, {\"q\": \"Pat\u0159\u00ed 1.4571 do t\u0159\u00eddy A4?\", \"a\": \"Ano. Ocel 1.4571 je molybdenem legovan\u00e1 austenitick\u00e1 nerez, kter\u00e1 spad\u00e1 do skupiny korozivzdorn\u00fdch ocel\u00ed t\u0159\u00eddy A4 pou\u017e\u00edvan\u00fdch pro spojovac\u00ed materi\u00e1l do n\u00e1ro\u010dn\u011bj\u0161\u00edho korozn\u00edho prost\u0159ed\u00ed.\"}, {\"q\": \"Do jak\u00e9 teploty lze 1.4571 pou\u017e\u00edt?\", \"a\": \"V\u00fdrobci uv\u00e1d\u011bj\u00ed provozn\u00ed pou\u017eit\u00ed a\u017e do p\u0159ibli\u017en\u011b 550 \u00b0C; ocel je vhodn\u00e1 i pro n\u00edzk\u00e9 teploty. Pr\u00e1v\u011b vy\u0161\u0161\u00ed pevnost a stabilita za zv\u00fd\u0161en\u00fdch teplot je hlavn\u00edm racion\u00e1ln\u00edm d\u016fvodem pro volbu 1.4571 oproti 1.4404.\"}, {\"q\": \"Kdy se vyplat\u00ed 1.4571 m\u00edsto 1.4404?\", \"a\": \"Technicky je volba 1.4571 od\u016fvodn\u011bn\u00e1 zejm\u00e9na tam, kde je rozhoduj\u00edc\u00ed pevnost za zv\u00fd\u0161en\u00fdch teplot (typicky nad cca 350 \u00b0C) a kde se sva\u0159uje bez n\u00e1sledn\u00e9ho rozpou\u0161t\u011bc\u00edho \u017e\u00edh\u00e1n\u00ed. Pro vodn\u00e1 prost\u0159ed\u00ed za b\u011b\u017en\u00fdch teplot zpravidla nep\u0159in\u00e1\u0161\u00ed proti 1.4404 praktickou v\u00fdhodu.\"}]","_matai_schema_type":"TechArticle","footnotes":""},"categories":[2],"tags":[],"class_list":["post-394","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-normy-a-materialy"],"_links":{"self":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/394","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/comments?post=394"}],"version-history":[{"count":1,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/394\/revisions"}],"predecessor-version":[{"id":581,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/posts\/394\/revisions\/581"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media\/747"}],"wp:attachment":[{"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/media?parent=394"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/categories?post=394"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.matai.cz\/blog\/wp-json\/wp\/v2\/tags?post=394"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}