{"id":3332,"date":"2026-05-14T03:52:11","date_gmt":"2026-05-14T03:52:11","guid":{"rendered":"https:\/\/sprocket-chain.net\/?p=3332"},"modified":"2026-05-14T03:52:11","modified_gmt":"2026-05-14T03:52:11","slug":"stainless-steel-sprockets-grade-selection-food-grade-compliance-and-corrosion-performance","status":"publish","type":"post","link":"https:\/\/sprocket-chain.net\/cs\/stainless-steel-sprockets-grade-selection-food-grade-compliance-and-corrosion-performance\/","title":{"rendered":"Ozuben\u00e1 kola z nerezov\u00e9 oceli: V\u00fdb\u011br jakosti, shoda s potravin\u00e1\u0159sk\u00fdmi normami a odolnost proti korozi"},"content":{"rendered":"
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SS 304<\/div>\n
nerezov\u00e1 ocel 316L<\/div>\n
Duplex 2205<\/div>\n
UHMW plast<\/div>\n<\/div>\n

Ozuben\u00e1 kola z nerezov\u00e9 oceli: V\u00fdb\u011br jakosti, shoda s potravin\u00e1\u0159sk\u00fdmi normami a odolnost proti korozi<\/h1>\n

Specifikace \u201eozuben\u00e9 kolo z nerezov\u00e9 oceli\u201c bez uveden\u00ed jakosti, povrchov\u00e9 \u00fapravy a \u00fa\u010delu maz\u00e1n\u00ed pro danou aplikaci vede k vytvo\u0159en\u00ed sou\u010d\u00e1st\u00ed, kter\u00e9 sice mohou b\u00fdt z hlediska materi\u00e1lu v souladu s FDA, ale nespl\u0148uj\u00ed hygienick\u00e9 po\u017eadavky na konstrukci, kter\u00e9 ve skute\u010dnosti ur\u010duj\u00ed vhodnost pro styk s potravinami.<\/p>\n

\u017d\u00e1dost o kontrolu specifikace nerezov\u00e9ho ozuben\u00e9ho kola<\/a><\/p>\n<\/div>\n<\/div>\n

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Z\u00e1vod na zpracov\u00e1n\u00ed mo\u0159sk\u00fdch plod\u016f na ji\u017en\u00edm pob\u0159e\u017e\u00ed Koreje instaloval za\u010d\u00e1tkem roku 2024 to, co si jeho n\u00e1kupn\u00ed odd\u011blen\u00ed objednalo jako \u201enerezov\u00e1 ozuben\u00e1 kola\u201c pro novou dopravn\u00ed linku na krevety. Ozuben\u00e1 kola byla vyrobena z nerezov\u00e9 oceli 304 se standardn\u00edm obr\u00e1b\u011bn\u00fdm povrchem. B\u011bhem \u0161esti m\u011bs\u00edc\u016f se na \u010deln\u00edch ploch\u00e1ch zub\u016f objevilo \u010dervenohn\u011bd\u00e9 zbarven\u00ed odpov\u00eddaj\u00edc\u00ed \u0161t\u011brbinov\u00e9 korozi a u dvou ozuben\u00fdch kol se na vnit\u0159n\u00edm povrchu otvoru vytvo\u0159ila d\u016flkov\u00e1 koroze v m\u00edstech, kde se b\u011bhem v\u00fdroby hromadila vlhkost. Probl\u00e9m nebyl v tom, \u017ee byla pou\u017eita nerezov\u00e1 ocel 304 \u2013 ale v tom, \u017ee nerezov\u00e1 ocel 304 je n\u00e1chyln\u00e1 ke \u0161t\u011brbinov\u00e9 korozi vyvolan\u00e9 chloridy a prom\u00fdvac\u00ed voda v tomto z\u00e1vod\u011b obsahovala 180 ppm chlorid\u016f z mo\u0159sk\u00e9 vody pou\u017e\u00edvan\u00e9 v chladic\u00edch n\u00e1dr\u017e\u00edch na krevety. Pro toto specifick\u00e9 prost\u0159ed\u00ed byla po\u017eadovanou jakost\u00ed nerezov\u00e1 ocel 316L \u2013 kter\u00e1 obsahuje molybden pro odolnost v\u016f\u010di chlorid\u016fm \u2013 nikoli 304. Rozd\u00edl v n\u00e1kladech na materi\u00e1l mezi t\u011bmito dv\u011bma jakostmi u t\u00e9to velikosti ozuben\u00e9ho kola byl p\u0159ibli\u017en\u011b 15%.<\/p>\n

Specifikace nerezov\u00e9ho \u0159et\u011bzov\u00e9ho kola vy\u017eaduje t\u0159i rozhodnut\u00ed nad r\u00e1mec jednoduch\u00e9ho v\u00fdb\u011bru materi\u00e1lu: spr\u00e1vnou jakost nerezov\u00e9 oceli pro korozn\u00ed prost\u0159ed\u00ed, spr\u00e1vnou povrchovou \u00fapravu pro hygienick\u00e9 pou\u017eit\u00ed a spr\u00e1vn\u00fd p\u0159\u00edstup k maz\u00e1n\u00ed na rozhran\u00ed \u0159et\u011bzu a \u0159et\u011bzov\u00e9ho kola. Ka\u017ed\u00e9 z t\u011bchto rozhodnut\u00ed je nez\u00e1visl\u00e9 a v\u0161echna t\u0159i mus\u00ed b\u00fdt spr\u00e1vn\u00e1, aby instalace fungovala podle o\u010dek\u00e1v\u00e1n\u00ed.<\/p>\n

\"Dvojit\u00e1<\/p>\n

Nerezov\u00e9 oceli pou\u017e\u00edvan\u00e9 pro ozuben\u00e1 kola: Jak\u00e9 jsou jejich skute\u010dn\u00e9 rozd\u00edly<\/h2>\n
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Stupe\u0148<\/th>\nCr \/ Ni \/ Mo (%)<\/th>\nOdolnost v\u016f\u010di chlorid\u016fm<\/th>\nTvrdost (obroben\u00e1)<\/th>\nM\u00edra opot\u0159eben\u00ed zub\u016f vs. CS<\/th>\nTypick\u00fd p\u0159\u00edpad pou\u017eit\u00ed<\/th>\n<\/tr>\n<\/thead>\n
304 \/ 1.4301<\/td>\n18Cr \/ 8Ni \/ 0Mo<\/td>\nSt\u0159edn\u00ed \u2013 pod ~80 ppm Cl\u207b<\/td>\n170\u2013200 HB<\/td>\n2,5\u20133,5\u00d7 vy\u0161\u0161\u00ed<\/td>\nZpracov\u00e1n\u00ed potravin (bez chlorid\u016f), lehk\u00e1 kyselina, m\u00edrn\u00e9 oplachov\u00e1n\u00ed<\/td>\n<\/tr>\n
316L \/ 1.4404<\/td>\n16Cr \/ 10Ni \/ 2Mo<\/td>\nDobr\u00e9 \u2013 a\u017e do ~400 ppm Cl\u207b<\/td>\n165\u2013195 HB<\/td>\n2,5\u20134,0\u00d7 vy\u0161\u0161\u00ed<\/td>\nZpracov\u00e1n\u00ed mo\u0159sk\u00fdch plod\u016f, linky CIP, lehk\u00e9 mo\u0159sk\u00e9 vody, chlorovan\u00e9 myt\u00ed<\/td>\n<\/tr>\n
316Ti \/ 1,4571<\/td>\n16Cr \/ 11Ni \/ 2Mo + Ti<\/td>\nDobr\u00e9 \u2013 Ti stabilizuje vs. senzibilizuje<\/td>\n170\u2013200 HB<\/td>\n3,0\u20134,0\u00d7 vy\u0161\u0161\u00ed<\/td>\nVysokoteplotn\u00ed proces potravin\u00e1\u0159stv\u00ed (svarov\u00e9 z\u00f3ny nad 400 \u00b0C)<\/td>\n<\/tr>\n
Duplex 2205 \/ 1,4462<\/td>\n22Cr \/ 5Ni \/ 3Mo<\/td>\nVynikaj\u00edc\u00ed \u2014 >1 000 ppm Cl\u207b<\/td>\n260\u2013310 HB<\/td>\n1,4\u20131,8\u00d7 vy\u0161\u0161\u00ed<\/td>\nMo\u0159sk\u00e9 prost\u0159ed\u00ed, zpracov\u00e1n\u00ed solanky, offshore prost\u0159ed\u00ed, chemick\u00fd z\u00e1vod<\/td>\n<\/tr>\n
904L \/ 1,4539<\/td>\n20Cr \/ 25Ni \/ 4,5Mo<\/td>\nVynikaj\u00edc\u00ed \u2014 odolnost v\u016f\u010di kyselin\u011b s\u00edrov\u00e9<\/td>\n170\u2013190 HB<\/td>\n3,5\u20135,0\u00d7 vy\u0161\u0161\u00ed<\/td>\nChemick\u00fd z\u00e1vod, kysel\u00e9 mo\u0159ic\u00ed l\u00e1zn\u011b, manipulace s kyselinou fosfore\u010dnou<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Protiintuitivn\u011b: ozuben\u00e1 kola z nerezov\u00e9 oceli maj\u00ed v\u00fdrazn\u011b hor\u0161\u00ed odolnost zub\u016f proti opot\u0159eben\u00ed ne\u017e ozuben\u00e1 kola z cementovan\u00e9 uhl\u00edkov\u00e9 oceli.<\/strong> Tvrdost obroben\u00e9 nerezov\u00e9 oceli 304 nebo 316L (170\u2013200 HB, p\u0159ibli\u017en\u011b HRC 8\u201312) je dramaticky ni\u017e\u0161\u00ed ne\u017e u ozuben\u00e9ho kola z cementa\u010dn\u011b kalen\u00e9 uhl\u00edkov\u00e9 oceli (55\u201360 HRC na povrchu zubu). Za stejn\u00fdch podm\u00ednek \u0159et\u011bzu a zat\u00ed\u017een\u00ed se zuby nerezov\u00e9ho ozuben\u00e9ho kola opot\u0159ebov\u00e1vaj\u00ed 2,5\u20134kr\u00e1t rychleji ne\u017e ekvivalenty cementa\u010dn\u011b kalen\u00e9 uhl\u00edkov\u00e9 oceli. Pro aplikace, kde je vy\u017eadov\u00e1na odolnost proti korozi, ale d\u016fle\u017eit\u00e1 je tak\u00e9 \u017eivotnost zub\u016f, poskytuje nerezov\u00e1 ocel Duplex 2205 (260\u2013310 HB, p\u0159ibli\u017en\u011b HRC 26\u201332) v\u00fdrazn\u011b lep\u0161\u00ed odolnost proti opot\u0159eben\u00ed ne\u017e austenitick\u00e9 jakosti za cenu vy\u0161\u0161\u00edch n\u00e1klad\u016f na materi\u00e1l a obr\u00e1b\u011bn\u00ed. Spr\u00e1vn\u00e1 odpov\u011b\u010f pro n\u00e1ro\u010dn\u00e1 korozivn\u00ed prost\u0159ed\u00ed nezn\u00ed \u201epou\u017eijte nerezovou ocel\u201c \u2013 zn\u00ed \u201epou\u017eijte spr\u00e1vnou jakost nerezov\u00e9 oceli s realistick\u00fdmi o\u010dek\u00e1v\u00e1n\u00edmi ohledn\u011b m\u00edry opot\u0159eben\u00ed\u201c.<\/div>\n

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Povrchov\u00e1 \u00faprava ozuben\u00fdch kol pro potravin\u00e1\u0159sk\u00fd pr\u016fmysl: Co hygienick\u00fd design skute\u010dn\u011b vy\u017eaduje<\/h2>\n
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Evropsk\u00e1 skupina pro hygienick\u00e9 in\u017een\u00fdrstv\u00ed a design (EHEDG) a hygienick\u00e9 normy 3-A specifikuj\u00ed, \u017ee povrchy p\u0159ich\u00e1zej\u00edc\u00ed do styku s potravinami mus\u00ed m\u00edt maxim\u00e1ln\u00ed drsnost povrchu Ra \u2264 0,8 \u00b5m (v americk\u00fdch specifikac\u00edch se \u010dasto uv\u00e1d\u00ed jako 0,8 \u00b5m Ra = p\u0159ibli\u017en\u011b 32 \u00b5palc\u016f Ra). Toto \u010d\u00edslo nen\u00ed libovoln\u00e9 \u2013 je to prahov\u00e1 hodnota, pod kterou b\u011b\u017en\u00e9 potravinov\u00e9 patogeny (Listeria, Salmonella, E. coli) nemohou tvo\u0159it stabiln\u00ed biofilmy. Nad Ra 0,8 \u00b5m poskytuje povrchov\u00e1 textura fyzik\u00e1ln\u00ed reten\u010dn\u00ed m\u00edsta, kter\u00e1 chr\u00e1n\u00ed bakterie p\u0159ed \u010distic\u00edmi chemik\u00e1liemi.<\/p>\n

Standardn\u00ed obr\u00e1b\u011bn\u00e9 nerezov\u00e9 ozuben\u00e9 kolo z CNC soustru\u017een\u00ed m\u00e1 typickou povrchovou \u00fapravu Ra 1,6\u20133,2 \u00b5m. To je pod hygienickou hranic\u00ed. Pro aplikace v p\u0159\u00edm\u00e9m kontaktu s potravinami vy\u017eaduj\u00ed povrchy ozuben\u00fdch kol dodate\u010dnou povrchovou \u00fapravu: brou\u0161en\u00ed na Ra \u2264 0,8 \u00b5m na v\u0161ech ploch\u00e1ch, kter\u00e9 p\u0159ich\u00e1zej\u00ed do kontaktu s produktem, n\u00e1sledovan\u00e9 elektrolytick\u00fdm le\u0161t\u011bn\u00edm pro sn\u00ed\u017een\u00ed povrchov\u00fdch vrchol\u016f a pasivaci povrchu nerezov\u00e9 oceli. Pro nekontaktn\u00ed povrchy (zadn\u00ed strany ozuben\u00fdch kol, bo\u010dn\u00ed plochy, kter\u00e9 se nedot\u00fdkaj\u00ed produktu ani \u0159et\u011bzu) je p\u0159ijateln\u00e1 standardn\u00ed obr\u00e1b\u011bn\u00e1 povrchov\u00e1 \u00faprava.<\/p>\n<\/div>\n

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Stru\u010dn\u00fd p\u0159ehled povrchov\u00fdch \u00faprav<\/div>\n
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Standardn\u00ed CNC obr\u00e1b\u011bn\u00ed<\/span>Ra 1,6\u20133,2 \u00b5m<\/span><\/div>\n
Pr\u016fmyslov\u00e9, nepotravin\u00e1\u0159sk\u00e9 aplikace<\/div>\n<\/div>\n
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Dokon\u010dit zem<\/span>Ra 0,8 \u00b5m<\/span><\/div>\n
Minim\u00e1ln\u00ed po\u017eadavky EHEDG pro styk s potravinami<\/div>\n<\/div>\n
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Elektrolyticky le\u0161t\u011bn\u00e9<\/span>Ra 0,2\u20130,4 \u00b5m<\/span><\/div>\n
Nejvy\u0161\u0161\u00ed hygiena; 3-A, ml\u00e9k\u00e1rna, farmaceutick\u00fd pr\u016fmysl<\/div>\n<\/div>\n
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Pouze pasivovan\u00e9<\/span>Ra nezm\u011bn\u011bno<\/span><\/div>\n
Pouze odolnost proti korozi \u2013 nejedn\u00e1 se o hygienickou \u00fapravu<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

Krom\u011b povrchov\u00e9 \u00fapravy \u010del ozuben\u00fdch kol se hygienick\u00fd design zam\u011b\u0159uje tak\u00e9 na geometrii z\u00f3n zadr\u017euj\u00edc\u00edch produkt. Standardn\u00ed ozuben\u00e9 kolo s n\u00e1bojem B m\u00e1 mezi \u010deln\u00ed plochou n\u00e1boje a zadn\u00ed \u010d\u00e1st\u00ed kotou\u010de ozuben\u00e9ho kola zapu\u0161t\u011bnou oblast \u2013 \u0161t\u011brbinu, kter\u00e1 shroma\u017e\u010fuje zbytky produktu a je obt\u00ed\u017en\u00e9 ji \u010distit. Hygienick\u00e9 konstrukce ozuben\u00fdch kol pro p\u0159\u00edm\u00fd kontakt s potravinami bu\u010f \u0161t\u011brbinu mezi n\u00e1bojem a kotou\u010dem zcela eliminuj\u00ed (konfigurace desky A bez v\u00fdstupku n\u00e1boje na stran\u011b produktu), nebo \u0161t\u011brbinu ut\u011bsn\u00ed souvisl\u00fdm polom\u011brov\u00fdm svarem. Tento geometrick\u00fd po\u017eadavek je odd\u011blen od materi\u00e1lu a povrchov\u00e9 \u00fapravy a je d\u016fvodem, pro\u010d standardn\u00ed pr\u016fmyslov\u00e1 ozuben\u00e1 kola \u2013 a to i z nerezov\u00e9 oceli 316L s povrchovou \u00fapravou Ra 0,8 \u00b5m \u2013 nejsou automaticky sou\u010d\u00e1stmi pro pou\u017eit\u00ed v potravin\u00e1\u0159sk\u00e9 kvalit\u011b.<\/p>\n

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Shoda s normami FDA 21 CFR a NSF pro nerezov\u00e1 ozuben\u00e1 kola<\/h2>\n

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P\u0159edpisy FDA 21 CFR Part 177 (nep\u0159\u00edm\u00e9 potravin\u00e1\u0159sk\u00e9 p\u0159\u00eddatn\u00e9 l\u00e1tky \u2013 polymery) a Part 170\u2013186 (obecn\u011b uzn\u00e1van\u00e9 jako bezpe\u010dn\u00e9 l\u00e1tky) p\u0159\u00edmo nereguluj\u00ed pou\u017e\u00edv\u00e1n\u00ed nerezov\u00fdch sou\u010d\u00e1st\u00ed v za\u0159\u00edzen\u00edch na zpracov\u00e1n\u00ed potravin, proto\u017ee nerezov\u00e1 ocel nen\u00ed potravin\u00e1\u0159skou p\u0159\u00eddatnou l\u00e1tkou v regula\u010dn\u00edm smyslu. Regulace FDA t\u00fdkaj\u00edc\u00ed se ozuben\u00fdch kol z nerezov\u00e9 oceli funguje prost\u0159ednictv\u00edm \u0161ir\u0161\u00edho r\u00e1mce 21 CFR Part 110 (Current Good Manufacturing Practice), kter\u00fd vy\u017eaduje, aby v\u0161echny povrchy za\u0159\u00edzen\u00ed, kter\u00e9 p\u0159ich\u00e1zej\u00ed do styku s potravinami, byly vyrobeny z materi\u00e1l\u016f, kter\u00e9 potraviny nekontaminuj\u00ed a kter\u00e9 lze \u010distit a dezinfikovat.<\/p>\n

Norma NSF\/ANSI 51 (Materi\u00e1ly pro potravin\u00e1\u0159sk\u00e1 za\u0159\u00edzen\u00ed) je nejp\u0159\u00edm\u011bji pou\u017eitelnou certifika\u010dn\u00ed normou pro nerezov\u00e9 komponenty pro zpracov\u00e1n\u00ed potravin v Koreji a v cel\u00e9m asijsko-pacifick\u00e9m regionu. Certifikace NSF\/ANSI 51 vy\u017eaduje: identifikaci a sledovatelnost materi\u00e1lu (certifik\u00e1t v\u00e1lcovny, \u010d\u00edslo tavby); ov\u011b\u0159en\u00ed povrchov\u00e9 \u00fapravy (m\u011b\u0159en\u00ed Ra ve v\u00edce bodech na povr\u0161\u00edch, kter\u00e9 p\u0159ich\u00e1zej\u00ed do styku s produktem); testov\u00e1n\u00ed odolnosti proti korozi; a absenci zak\u00e1zan\u00fdch povrchov\u00fdch \u00faprav nebo povlak\u016f, kter\u00e9 by mohly migrovat do potravin. Nerezov\u00e9 ozuben\u00e9 kolo s certifikac\u00ed NSF\/ANSI 51 poskytuje dokument\u00e1rn\u00ed doklad o shod\u011b vhodn\u00fd pro \u00fa\u010dely auditu HACCP.<\/p>\n

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Vhodn\u00e9 pro styk s potravinami<\/div>\n