[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.recado.cz\/otazka-tvrdosti\/#Article","mainEntityOfPage":"https:\/\/www.recado.cz\/otazka-tvrdosti\/","headline":"Ot\u00e1zka tvrdosti","name":"Ot\u00e1zka tvrdosti","description":"Je jasn\u00e9, \u017ee to zn\u00e1te, nejv\u00edce m\u011bkk\u00fd je grafit neboli \u010desky tuha. Nu a nejtvrd\u0161\u00ed je diamant....","datePublished":"2025-02-18","dateModified":"2025-02-18","author":{"@type":"Person","@id":"https:\/\/www.recado.cz\/author\/#Person","name":"","url":"https:\/\/www.recado.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/01173f1da90dde8adb887d6793fa4e42c4004e53f8d645d9b1cb57c2dee8e188?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/01173f1da90dde8adb887d6793fa4e42c4004e53f8d645d9b1cb57c2dee8e188?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"recado.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.recado.cz\/wp-content\/uploads\/iron-bars-474810_640.jpg","url":"https:\/\/www.recado.cz\/wp-content\/uploads\/iron-bars-474810_640.jpg","height":0,"width":0},"url":"https:\/\/www.recado.cz\/otazka-tvrdosti\/","about":["V\u00fdrobky"],"wordCount":433,"articleBody":"        Je jasn\u00e9, \u017ee to zn\u00e1te, nejv\u00edce m\u011bkk\u00fd je grafit neboli \u010desky tuha. Nu a nejtvrd\u0161\u00ed je diamant. Mo\u017en\u00e1 si je\u0161t\u011b pamatujete pou\u010dku o tom, \u017ee pokud nerostem ud\u011bl\u00e1te r\u00fdhu do jin\u00e9ho, je ten s tou r\u00fdhu o t\u0159\u00eddu n\u00ed\u017ee na stupnici. Ale to jsme drob\u00e1tko mimo, i kdy\u017e o tvrdosti zde \u0159e\u010d pochopiteln\u011b bude. Uvid\u00edte sami. Jist\u011b v\u00edte a zn\u00e1te co je \u017eelezo a jist\u011b minim\u00e1ln\u011b tu\u0161\u00edte, \u017ee i ono m\u00e1 jakousi stupnici tvrdosti. Podle periodick\u00e9 soustavy prvk\u016f je nejv\u00edce tvrd\u00fd chrom, kter\u00fd je na Moshov\u011b stupnici zaps\u00e1n pod \u010d\u00edslem osm cel\u00fdch p\u011bt a po n\u011bm je to wolfram, kter\u00fd m\u00e1 tvrdost jen sedm cel\u00fdch p\u011bt, op\u011bt podle Mohsovy stupnice.Nen\u00ed se tedy co divit, \u017ee pr\u00e1v\u011b toto jsou kovy, kter\u00e9 se p\u0159id\u00e1vaj\u00ed k oceli pr\u00e1v\u011b kv\u016fli pevnosti. K tomu se v\u0161ak je\u0161t\u011b dostaneme. Jak zn\u00e1mo, ocel vznik\u00e1 zkuj\u0148ov\u00e1n\u00edm \u017eeleza, a to n\u011bkolika zp\u016fsoby. Zpo\u010d\u00e1tku to bylo dejlov\u00e1n\u00ed \u010di pudlov\u00e1n\u00ed, v sou\u010dasnosti je to nej\u010dast\u011bji za pou\u017eit\u00ed konvertor\u016f. Samoz\u0159ejm\u011b, \u017ee pak je\u0161t\u011b m\u016f\u017ee doch\u00e1zet k dal\u0161\u00edm \u00faprav\u00e1m https:\/\/neoluxor.cz\/ucebnice\/zakladni-skoly\/6-trida\/  Pr\u00e1v\u011b ty je\u0161t\u011b v\u00edce zlep\u0161\u00ed vlastnosti oceli jako takov\u00e9. Ka\u017ed\u00fd v\u00fdrobek pak dostane svoje ur\u010dit\u00e9 ozna\u010den\u00ed a ten kdo s t\u00edm pracuje jen podle \u010d\u00edsla pozn\u00e1 o\u010d se jedn\u00e1.Tak\u017ee nap\u0159\u00edklad pokud uvid\u00ed ozna\u010den\u00ed 10CrMo9-10, 1.7380, ihned v\u00ed o\u010d kr\u00e1\u010d\u00ed, co je za druh oceli a k \u010demu se nejl\u00e9pe hod\u00ed. Pokud je takov\u00e1to ocel vyrobena, mus\u00ed ov\u0161em splnit pom\u011brn\u011b slo\u017eit\u00e1 krit\u00e9ria, aby se mohla do t\u00e9 \u010di on\u00e9 skupiny za\u0159adit. V p\u0159edchoz\u00edm \u010d\u00edsle lze vid\u011bt \u017ee ke zkvalitn\u011bn\u00ed byl pou\u017eit molybden a chrom. Ale m\u016f\u017ee to b\u00fdt cokoli jin\u00e9ho, jak je ps\u00e1no o p\u00e1r \u0159\u00e1dk\u016f v\u00fd\u0161e a t\u00edm pln\u00edm slib, \u017ee se k tomu je\u0161t\u011b dostaneme. To v\u0161echno dohromady pak mus\u00ed splnit normy, kter\u00e9 jsou p\u0159esn\u011b d\u00e1ny, jako nap\u0159\u00edklad EN 10273. Tato je konkr\u00e9tn\u011b pro ty\u010de v\u00e1lcovan\u00e9 za tepla ze sva\u0159ovateln\u00e9 oceli. Ale i zde je t\u011bchto norem hodn\u011b. Druh\u016f oceli je obrovsk\u00e1 spousta a v\u00fdrobky z n\u00ed jsou na trhu zcela b\u011b\u017en\u011b. Ur\u010dit\u011b jste s nimi ji\u017e n\u011bkde setkali.                                                                                                                                                                                                                                                                                                                                                                                           3.8\/5 - (6 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Ot\u00e1zka tvrdosti","item":"https:\/\/www.recado.cz\/otazka-tvrdosti\/#breadcrumbitem"}]}]