{"id":8805,"date":"2025-06-15T02:00:17","date_gmt":"2025-06-15T02:00:17","guid":{"rendered":"https:\/\/premiumalu.com\/7021-aluminum-the-ultimate-guide-to-its-uses\/"},"modified":"2026-10-08T03:22:52","modified_gmt":"2026-10-08T03:22:52","slug":"7021-hlinik-pruvodce-jeho-pouzitim","status":"publish","type":"post","link":"https:\/\/premiumalu.com\/cs\/7021-aluminum-the-ultimate-guide-to-its-uses\/","title":{"rendered":"Hlin\u00edk 7021: Vlastnosti, stavy a pr\u016fvodce obr\u00e1b\u011bn\u00edm"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Co je slitina hlin\u00edku 7021?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">7021 je tepeln\u011b zpracovateln\u00e1 slitina Al-Zn-Mg ze skupiny 7xxx, registrovan\u00e1 jako EN AW-7021 (AlZn5.5Mg1.5) a jako UNS A97021. Je to stupe\u0148 7xxx, po kter\u00e9m s\u00e1hnout, kdy\u017e d\u00edl mus\u00ed udr\u017eet toleranci p\u0159i t\u011b\u017ek\u00e9m obr\u00e1b\u011bn\u00ed nebo mus\u00ed b\u00fdt sva\u0159iteln\u00fd a p\u0159itom dos\u00e1hnout pevnostn\u00ed t\u0159\u00eddy 7xxx \u2014 dv\u011b v\u011bci, kter\u00e9 7075 nezvl\u00e1dne.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kompromis, kter\u00fd d\u011bl\u00e1, se t\u00fdk\u00e1 m\u011bdi. 7075 obsahuje 1,2\u20132,0% m\u011bdi, co\u017e j\u00ed kupuje \u0161pi\u010dkovou pevnost a stoj\u00ed ji to sva\u0159itelnost a odolnost proti korozn\u00edmu prask\u00e1n\u00ed za nap\u011bt\u00ed. 7021 omezuje m\u011b\u010f na 0,25%, vzd\u00e1v\u00e1 se p\u0159ibli\u017en\u011b 30% t\u00e9to pevnosti a v\u00fdm\u011bnou se \u010dist\u011b obr\u00e1b\u00ed, z\u016fst\u00e1v\u00e1 ploch\u00fd p\u0159i hlubok\u00fdch \u0159ezech a lze jej tavn\u011b sva\u0159ovat \u2014 kombinace, kterou zbytek skupiny 7xxx nenab\u00edz\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chemick\u00e9 slo\u017een\u00ed 7021<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00ed\u017ee uveden\u00e9 limity jsou registrovan\u00e9 hodnoty podle EN 573-3. Rozsah mimo n\u011b na certifik\u00e1tu poch\u00e1z\u00ed z jin\u00e9 normy, nikoli z jin\u00e9 7021.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Prvek<\/td><td>Hmotnost %<\/td><td>Role<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>0,25 max.<\/td><td>Limit ne\u010distot<\/td><\/tr><tr><td>\u017delezo (Fe)<\/td><td>max 0,40<\/td><td>Limit ne\u010distot<\/td><\/tr><tr><td>M\u011b\u010f (Cu)<\/td><td>0,25 max.<\/td><td>Horn\u00ed mez, kter\u00e1 udr\u017euje slitinu sva\u0159itelnou<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0,10 max<\/td><td>Limit ne\u010distot<\/td><\/tr><tr><td>Ho\u0159\u010d\u00edk (Mg)<\/td><td>1.2 - 1.8<\/td><td>Zpev\u0148uj\u00edc\u00ed prvek<\/td><\/tr><tr><td>Chrom (Cr)<\/td><td>0,05 max<\/td><td>Limit ne\u010distot<\/td><\/tr><tr><td>Zinek (Zn)<\/td><td>5.0 - 6.0<\/td><td>Prim\u00e1rn\u00ed zpev\u0148uj\u00edc\u00ed prvek<\/td><\/tr><tr><td>Titan (Ti)<\/td><td>0,10 max<\/td><td>Zjem\u0148ova\u010d zrna<\/td><\/tr><tr><td><strong>Zirkonium (Zr)<\/strong><\/td><td><strong>0.08 - 0.18<\/strong><\/td><td>Zvy\u0161uje teplotu rekrystalizace; podporuje sva\u0159itelnost<\/td><\/tr><tr><td>Ostatn\u00ed, ka\u017ed\u00fd \/ celkem<\/td><td>0.05 \/ 0.15<\/td><td>\u2014<\/td><\/tr><tr><td>Hlin\u00edk (Al)<\/td><td>Zbytek<\/td><td>Nobelmetal<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Pouze t\u0159i \u0159\u00e1dky jsou \u00famysln\u00e9 p\u0159\u00eddavky \u2014 zinek, ho\u0159\u010d\u00edk a zirkonium; ka\u017ed\u00fd dal\u0161\u00ed prvek je horn\u00ed mez\u00ed toho, co m\u016f\u017ee b\u00fdt p\u0159\u00edtomno. M\u011b\u010f je \u0159\u00e1dek, kter\u00fd je t\u0159eba zkontrolovat jako prvn\u00ed, proto\u017ee tento stupe\u0148 ji omezuje na 0,25%. Hlin\u00edk je registrov\u00e1n jako zbytek, nikoli jako pevn\u00fd rozsah.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mechanick\u00e9 vlastnosti podle zp\u016fsobu temperov\u00e1n\u00ed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">7021 se objedn\u00e1v\u00e1 mainly v T6 a T651. EN 485-2 pokr\u00fdv\u00e1 plech, p\u00e1s a tlust\u00fd plech; EN 755-2 pokr\u00fdv\u00e1 lisovan\u00e9 ty\u010de, trubky a profily.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Majetek<\/td><td>Hodnota<\/td><td>Stav<\/td><\/tr><tr><td>Pevnost v tahu, Rm<\/td><td>min. 400 MPa (typicky \u2248410 MPa)<\/td><td>T6, plech a tlust\u00fd plech, EN 485-2<\/td><\/tr><tr><td>Mez kluzu, Rp0.2<\/td><td>min. 350 MPa<\/td><td>T6, plech a tlust\u00fd plech, EN 485-2<\/td><\/tr><tr><td>Ta\u017enost, A \/ A50<\/td><td>min. 10% \/ min. 8%<\/td><td>T6, plech a tlust\u00fd plech, EN 485-2<\/td><\/tr><tr><td>Tvrdost<\/td><td>\u2248120 HBW<\/td><td>T6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Fyzik\u00e1ln\u00ed vlastnost<\/td><td>Hodnota<\/td><\/tr><tr><td>Hustota<\/td><td>2,80 g\/cm\u00b3<\/td><\/tr><tr><td>Modul pru\u017enosti<\/td><td>70 GPa<\/td><\/tr><tr><td>Tepeln\u00e1 vodivost<\/td><td>125 \u2013 155 W\/m\u00b7K<\/td><\/tr><tr><td>Tepeln\u00e1 rozta\u017enost<\/td><td>23 \u00b5m\/m\u00b7K<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Mez kluzu 350 MPa je p\u0159ibli\u017en\u011b o 27% vy\u0161\u0161\u00ed ne\u017e u 6061-T6 a asi o 30% ni\u017e\u0161\u00ed ne\u017e u 7075-T6 \u2014 skute\u010dn\u00fd stupe\u0148 7xxx, ani\u017e by byl \u0161pi\u010dkov\u011b pevnostn\u00edm. Tepeln\u00e1 vodivost nese druh\u00e9 komer\u010dn\u011b rozhoduj\u00edc\u00ed \u010d\u00edslo: 125\u2013155 W\/m\u00b7K je to, co umo\u017e\u0148uje hlin\u00edkov\u00e9 form\u011b cyklovat rychleji ne\u017e ocelov\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tenk\u00e9 tlou\u0161\u0165ky dosahuj\u00ed vy\u0161\u0161\u00edch hodnot ne\u017e minimum pro tlust\u00fd plech \u2014 plech v kvalit\u011b pro anodizaci od 1,5 do 3 mm je b\u011b\u017en\u011b testov\u00e1n na 460\u2013480 MPa pro T6 a T651. \u010ct\u011bte minima EN 485-2 jako n\u00e1vrhov\u00e9 hodnoty a ten\u010d\u00ed \u010d\u00edsla jako v\u00fdrobn\u00ed v\u00fdkon; certifik\u00e1t pro va\u0161i tavbu rozhoduje, kter\u00e9 plat\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kde se 7021 pou\u017e\u00edv\u00e1<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications.webp\" alt=\"7021-aplikace\" class=\"wp-image-10692\" srcset=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications.webp 800w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications-300x225.webp 300w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications-768x576.webp 768w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications-16x12.webp 16w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-applications-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">T\u0159i aplika\u010dn\u00ed skupiny p\u0159edstavuj\u00ed v\u011bt\u0161inu pou\u017eit\u00ed tohoto stupn\u011b a ka\u017ed\u00e1 vypl\u00fdv\u00e1 ze stejn\u00e9 vlastnosti \u2014 n\u00edzk\u00e9 zbytkov\u00e9 nap\u011bt\u00ed v tlust\u00e9m plechu plus dobr\u00e1 obrobitelnost.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Formy a n\u00e1strojov\u00e9 desky<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hlavn\u00ed trh. Vst\u0159ikovac\u00ed a vyfukovac\u00ed formy, tvarov\u00e1n\u00ed za tepla a n\u00e1stroje pro p\u0159enos prysky\u0159ice pou\u017e\u00edvaj\u00ed <a href=\"https:\/\/premiumalu.com\/cs\/produkt\/slitina-hliniku-7021\/\">desky dutin z 7021<\/a>, stejn\u011b jako z\u00e1kladov\u00e9 desky a up\u00ednac\u00ed stoly stroj\u016f. D\u016fvodem je n\u00edzk\u00e9 vnit\u0159n\u00ed nap\u011bt\u00ed: hlubok\u00e1 dutina si udr\u017e\u00ed tvar, m\u00edsto aby se plazila, jak se materi\u00e1l odeb\u00edr\u00e1, a argument proti ocelov\u00fdm n\u00e1stroj\u016fm je doba cyklu, nikoli pevnost.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Obr\u00e1b\u011bn\u00e9 a hydraulick\u00e9 komponenty<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Rozd\u011blova\u010de, t\u011bla ventil\u016f, mont\u00e1\u017en\u00ed desky a hnac\u00ed komponenty vyu\u017e\u00edvaj\u00ed stejn\u00e9 chov\u00e1n\u00ed p\u0159i \u0159ez\u00e1n\u00ed \u2014 kr\u00e1tk\u00e9 t\u0159\u00edsky, \u010dist\u00fd povrch, \u017eivotnost n\u00e1stroje, kter\u00e1 vydr\u017e\u00ed dlouh\u00e9 s\u00e9rie. Kde je \u0159ez hlubok\u00fd nebo asymetrick\u00fd, specifikujte T651.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sva\u0159ovan\u00e9 sestavy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">7021 je jednou z m\u00e1la slitin Al-Zn-Mg, kter\u00e9 lze tavn\u011b sva\u0159ovat, co\u017e vypl\u00fdv\u00e1 z omezen\u00ed m\u011bdi a p\u0159\u00eddavku zirkonia. Kde d\u00edl pot\u0159ebuje pevnost 7xxx a sva\u0159ovan\u00fd spoj, to je d\u016fvod, pro\u010d se tento stupe\u0148 specifikuje. U s\u00e9riov\u00fdch sva\u0159ovan\u00fdch konstrukc\u00ed, <a href=\"https:\/\/premiumalu.com\/cs\/zvladnuti-hlinikove-slitiny-7005-komplexni-pruvodce\/\">7005<\/a> nebo <a href=\"https:\/\/premiumalu.com\/cs\/produkt\/slitina-hliniku-7020\/\">7020<\/a> je obvykle levn\u011bj\u0161\u00ed cestou.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mo\u017enosti stav\u016f slitiny 7021<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">7021 se dod\u00e1v\u00e1 ve t\u0159ech stavech, z nich\u017e ka\u017ed\u00fd \u0159e\u0161\u00ed jin\u00fd po\u017eadavek zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Temperament<\/td><td>Zpracov\u00e1n\u00ed<\/td><td>Pevnostn\u00ed t\u0159\u00edda<\/td><td>Nejlep\u0161\u00ed pro<\/td><td>Vyhnout se, kdy\u017e<\/td><\/tr><tr><td>T6<\/td><td>Tepeln\u011b o\u0161et\u0159eno roztokem a um\u011ble st\u00e1rnuto<\/td><td>Minima EN 485-2<\/td><td>Formy, obecn\u00e9 konstruk\u010dn\u00ed a sva\u0159ovan\u00e9 d\u00edly dod\u00e1van\u00e9 p\u0159ipraven\u00e9 k pou\u017eit\u00ed<\/td><td>Hlubok\u00e9 obr\u00e1b\u011bn\u00ed, kde z\u00e1le\u017e\u00ed na zbytkov\u00e9m nap\u011bt\u00ed<\/td><\/tr><tr><td>T651<\/td><td>T6 plus \u0159\u00edzen\u00e9 prota\u017een\u00ed pro odstran\u011bn\u00ed nap\u011bt\u00ed o 1\u20133%<\/td><td>Stejn\u00e1 t\u0159\u00edda jako T6<\/td><td>Siln\u011b obr\u00e1b\u011bn\u00e9 d\u00edly: hlubok\u00e9 kapsy, asymetrick\u00e9 \u0159ezy, t\u011bsn\u00e1 rovinnost<\/td><td>Nen\u00ed pot\u0159eba, kde jde pouze o lehk\u00e9 o\u0159ez\u00e1v\u00e1n\u00ed nebo vrt\u00e1n\u00ed<\/td><\/tr><tr><td>T62<\/td><td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed a st\u00e1rnut\u00ed po tv\u00e1\u0159en\u00ed nebo v\u00fdrob\u011b<\/td><td>Ekvivalentn\u00ed T6<\/td><td>Sestavy st\u00e1rnut\u00e9 jako hotov\u00fd d\u00edl, nikoli dod\u00e1van\u00e9 ve st\u00e1rnut\u00e9m stavu<\/td><td>Objedn\u00e1v\u00e1n\u00ed v\u00fdchoz\u00edho materi\u00e1lu \u2014 specifikujte T6 nebo T651<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">7021 vs 7075 vs 6061<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061.webp\" alt=\"7021-7075-6061\" class=\"wp-image-10694\" srcset=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061.webp 800w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061-300x225.webp 300w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061-768x576.webp 768w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061-16x12.webp 16w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-7075-6061-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Tyto t\u0159i slitiny pokr\u00fdvaj\u00ed v\u011bt\u0161inu rozhodnut\u00ed o vysokopevnostn\u00edm hlin\u00edku.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Majetek<\/td><td>7021-T6<\/td><td>7075-T6<\/td><td>6061-T6<\/td><\/tr><tr><td>Pevnost v tahu<\/td><td>min. 400 MPa (typicky \u2248410)<\/td><td>typicky 572 MPa<\/td><td>typicky 310 MPa<\/td><\/tr><tr><td>Mez kluzu<\/td><td>min. 350 MPa<\/td><td>typicky 503 MPa<\/td><td>276 MPa typicky<\/td><\/tr><tr><td>Prodlou\u017een\u00ed<\/td><td>10% min<\/td><td>~11%<\/td><td>12\u201317%<\/td><\/tr><tr><td>Hustota<\/td><td>2,80 g\/cm\u00b3<\/td><td>2,81 g\/cm\u00b3<\/td><td>2,70 g\/cm\u00b3<\/td><\/tr><tr><td>Zbytkov\u00e9 nap\u011bt\u00ed \/ stabilita<\/td><td>Velmi n\u00edzk\u00e9; jakost pro n\u00e1strojov\u00e9 desky<\/td><td>Vysok\u00e9; deformace p\u0159i t\u011b\u017ek\u00e9m obr\u00e1b\u011bn\u00ed<\/td><td>M\u00edrn\u00e1<\/td><\/tr><tr><td>Obrobitelnost<\/td><td>V\u00fdborn\u00e1; kr\u00e1tk\u00e9 t\u0159\u00edsky, dobr\u00fd lesk<\/td><td>Dobr\u00fd<\/td><td>Dobr\u00fd<\/td><\/tr><tr><td>Sva\u0159itelnost<\/td><td>Dobr\u00e1, s kvalifikovan\u00fdm MIG\/TIG a p\u0159\u00eddavn\u00fdm materi\u00e1lem 5356 nebo 5183<\/td><td>Nedoporu\u010duje se pro tavn\u00e9 sva\u0159ov\u00e1n\u00ed<\/td><td>V\u00fdborn\u00e1, v\u0161echny b\u011b\u017en\u00e9 procesy<\/td><\/tr><tr><td>Odolnost proti korozi<\/td><td>St\u0159edn\u00ed; vy\u017eaduje n\u00e1t\u011br nebo eloxov\u00e1n\u00ed<\/td><td>Omezen\u00e1; vy\u017eaduje n\u00e1t\u011br nebo n\u00e1vary<\/td><td>Dobr\u00fd<\/td><\/tr><tr><td>Typick\u00e9 aplikace<\/td><td>Formy, n\u00e1strojov\u00e9 desky, obr\u00e1b\u011bn\u00e9 a hydraulick\u00e9 d\u00edly, sva\u0159ovan\u00e9 sestavy<\/td><td>Vysoce nam\u00e1han\u00e9 obr\u00e1b\u011bn\u00e9 d\u00edly, konstrukce drak\u016f letadel<\/td><td>V\u0161eobecn\u00e1 v\u00fdroba, n\u00e1mo\u0159n\u00ed aplikace, architektura<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Sloupec 7021 je minimum podle EN 485-2; sloupce 7075 a 6061 jsou publikovan\u00e9 typick\u00e9 hodnoty. Porovn\u00e1vejte \u0159\u00e1dov\u00e9 hodnoty, nikoli desetinn\u00e1 m\u00edsta, a potvr\u010fte \u00fadaje platn\u00e9 pro v\u00e1\u0161 vlastn\u00ed tvar a tlou\u0161\u0165ku na atestu z v\u00e1lcovny.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pr\u00e1ce s 7021<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Obr\u00e1b\u011bn\u00ed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Obr\u00e1b\u011bn\u00ed je d\u016fvodem existence t\u00e9to jakosti a 7021 pod\u00e1v\u00e1 v\u00fdkon na horn\u00ed hranici rozsahu pro slitinu 7xxx. T\u0159\u00edsky se kr\u00e1tce l\u00e1mou, povrch je \u010dist\u00fd a karbidov\u00e9 n\u00e1stroje p\u0159i st\u0159edn\u00edch a\u017e vysok\u00fdch ot\u00e1\u010dk\u00e1ch v\u0159etena dob\u0159e vydr\u017e\u00ed. Rychlo\u0159ezn\u00e1 ocel funguje pro m\u011blk\u00e9 prvky, ale ekonomika spo\u010d\u00edv\u00e1 v karbidu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pro hlubok\u00e9 kapsy, asymetrick\u00e9 \u0159ezy nebo t\u011bsn\u00e9 tolerance rovinnosti specifikujte T651 nam\u00edsto T6. Nap\u011b\u0165ov\u00e9 vyrovn\u00e1n\u00ed tahem se prov\u00e1d\u00ed p\u0159ed obr\u00e1b\u011bn\u00edm, tak\u017ee se deska b\u011bhem pr\u00e1ce neuvoln\u00ed do deformace. Pro o\u0159ez\u00e1v\u00e1n\u00ed, vrt\u00e1n\u00ed a lehk\u00e9 fr\u00e9zov\u00e1n\u00ed je T6 dostate\u010dn\u011b stabiln\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sva\u0159ov\u00e1n\u00ed<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions.webp\" alt=\"7021-podm\u00ednky-sva\u0159ov\u00e1n\u00ed\" class=\"wp-image-10695\" srcset=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions.webp 800w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions-300x225.webp 300w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions-768x576.webp 768w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions-16x12.webp 16w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-welding-conditions-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">7021 lze tavn\u011b sva\u0159ovat, a to je rozd\u00edlov\u00fd prvek \u2014 vypl\u00fdv\u00e1 z omezen\u00ed obsahu m\u011bdi a p\u0159\u00eddavku zirkonia. P\u0159\u00eddavn\u00fd materi\u00e1l je jakost 5xxx, 5356 nebo 5183, kter\u00e1 udr\u017euje dostatek ho\u0159\u010d\u00edku v tavenin\u011b pro odolnost proti prask\u00e1n\u00ed za tuhnut\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Krom\u011b volby p\u0159\u00eddavn\u00e9ho materi\u00e1lu je to ot\u00e1zka postupu, nikoli materi\u00e1lu: v\u00fdrobce mus\u00ed kvalifikovat sva\u0159ovac\u00ed postup pro tuto slitinu nam\u00edsto p\u0159evzet\u00ed postupu napsan\u00e9ho pro pr\u00e1ci s 6xxx. O\u010dek\u00e1vejte, \u017ee limituj\u00edc\u00edm prvkem pevnosti bude svar, nikoli z\u00e1kladn\u00ed materi\u00e1l, a dimenzujte pr\u016f\u0159ez odpov\u00eddaj\u00edc\u00edm zp\u016fsobem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Korozn\u00ed ochrana<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Jako v\u011bt\u0161ina zinkem bohat\u00e9ho hlin\u00edku m\u00e1 7021 st\u0159edn\u00ed korozn\u00ed odolnost a pro venkovn\u00ed nebo vlhk\u00e9 prost\u0159ed\u00ed vy\u017eaduje ochranu. V\u011bt\u0161inu p\u0159\u00edpad\u016f pokr\u00fdvaj\u00ed t\u0159i p\u0159\u00edstupy.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Eloxov\u00e1n\u00ed.<\/strong> Anodizace v kyselin\u011b s\u00edrov\u00e9 vytv\u00e1\u0159\u00ed \u0159\u00edzenou oxidovou bari\u00e9ru. O\u010dek\u00e1vejte, \u017ee vrstva bude m\u00e9n\u011b rovnom\u011brn\u00e1 ne\u017e u slitiny 6xxx, a p\u0159ed uvoln\u011bn\u00edm dekorativn\u00edho d\u00edlu potvr\u010fte t\u0159\u00eddu povrchov\u00e9 \u00fapravy na vzorku.<\/li>\n\n\n\n<li><strong>N\u00e1t\u011brov\u00e9 syst\u00e9my.<\/strong> Konverzn\u00ed povlak, epoxidov\u00fd z\u00e1klad a polyuretanov\u00fd vrchn\u00ed n\u00e1t\u011br je standardn\u00ed pr\u016fmyslov\u00e1 skladba. P\u0159\u00edprava povrchu rozhoduje o tom, zda n\u00e1t\u011br vydr\u017e\u00ed.<\/li>\n\n\n\n<li><strong>Navrhujte s ohledem na odvodn\u011bn\u00ed.<\/strong> Vyhn\u011bte se kaps\u00e1m, \u0161t\u011brbin\u00e1m a ploch\u00fdm nahoru sm\u011b\u0159uj\u00edc\u00edm ploch\u00e1m, kde se dr\u017e\u00ed voda. Volba geometrie p\u0159edch\u00e1z\u00ed v\u00edce korozn\u00edm probl\u00e9m\u016fm ne\u017e jak\u00fdkoli n\u00e1t\u011br naprav\u00ed.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Limit provozn\u00ed teploty<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">7021 je precipita\u010dn\u011b vytvrzen\u00e1, tak\u017ee jej\u00ed pevnost z\u00e1vis\u00ed na tom, \u017ee vytvrzuj\u00edc\u00ed f\u00e1ze z\u016fstane ve stavu, v jak\u00e9m byla st\u00e1rnuta. Nep\u0159etr\u017eit\u00fd provoz nad p\u0159ibli\u017en\u011b 100\u2013120 \u00b0C za\u010d\u00edn\u00e1 p\u0159est\u00e1r\u00e1vat stav a sni\u017eovat mez kluzu, zat\u00edmco kr\u00e1tk\u00e9 v\u00fdkyvy na p\u0159ibli\u017en\u011b 200 \u00b0C jsou tolerovateln\u00e9, ani\u017e by \u0161lo o konstruk\u010dn\u00ed hodnocen\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zirkonium tento proces zpomaluje ve srovn\u00e1n\u00ed s 7075, ale ani jedna slitina nen\u00ed volbou pro vysok\u00e9 teploty. Pro trval\u00e9 teplotn\u00ed zat\u00ed\u017een\u00ed hledejte \u017e\u00e1ruvzdornou jakost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdhody a omezen\u00ed na prvn\u00ed pohled<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Faktor<\/td><td>V\u00fdhoda<\/td><td>Omezen\u00ed<\/td><\/tr><tr><td>Stabilita p\u0159i obr\u00e1b\u011bn\u00ed<\/td><td>Velmi n\u00edzk\u00e9 zbytkov\u00e9 nap\u011bt\u00ed; jakost pro n\u00e1strojov\u00e9 desky<\/td><td>\u2014<\/td><\/tr><tr><td>Obrobitelnost<\/td><td>Kr\u00e1tk\u00e9 t\u0159\u00edsky, \u010dist\u00fd povrch, dobr\u00e1 le\u0161titelnost<\/td><td>Pro hlubok\u00e9 nebo nerovnom\u011brn\u00e9 odeb\u00edr\u00e1n\u00ed materi\u00e1lu specifikujte T651<\/td><\/tr><tr><td>S\u00edla<\/td><td>350 MPa mez kluzu min v T6 \u2014 skute\u010dn\u00e1 t\u0159\u00edda 7xxx<\/td><td>~30% pod 7075-T6, kde rozhoduje mez kluzu<\/td><\/tr><tr><td>Sva\u0159itelnost<\/td><td>Jedna z m\u00e1la slitin 7xxx, kterou lze tavn\u011b sva\u0159ovat<\/td><td>Vy\u017eaduje vlastn\u00ed kvalifikovan\u00fd postup; ur\u010dit\u00e1 ztr\u00e1ta v tepeln\u011b ovlivn\u011bn\u00e9 z\u00f3n\u011b je nevyhnuteln\u00e1<\/td><\/tr><tr><td>Odolnost proti korozi<\/td><td>Dostate\u010dn\u00e1 po eloxov\u00e1n\u00ed nebo nat\u0159en\u00ed<\/td><td>Hol\u00e1 slitina nen\u00ed vhodn\u00e1 pro nechr\u00e1n\u011bn\u00e9 vlhk\u00e9 nebo mo\u0159sk\u00e9 prost\u0159ed\u00ed<\/td><\/tr><tr><td>Tepeln\u00e1 vodivost<\/td><td>125\u2013155 W\/m\u00b7K; rychlej\u0161\u00ed cyklov\u00e1n\u00ed forem ne\u017e u oceli<\/td><td>\u2014<\/td><\/tr><tr><td>Provozn\u00ed teplota<\/td><td>Stabiln\u00ed do p\u0159ibli\u017en\u011b 100\u2013120 \u00b0C<\/td><td>Nen\u00ed slitina pro vysok\u00e9 teploty<\/td><\/tr><tr><td>Dostupnost<\/td><td>Standardn\u011b v desk\u00e1ch a ty\u010d\u00edch, plus extrudovan\u00e9 tvary<\/td><td>M\u00e9n\u011b b\u011b\u017en\u011b skladem ne\u017e 6061; ov\u011b\u0159te p\u0159ed n\u00e1vrhem na jej\u00edm z\u00e1klad\u011b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Go\/No-Go<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pou\u017eijte tyto prahov\u00e9 hodnoty k rozhodnut\u00ed, zda 7021 pat\u0159\u00ed do n\u00e1vrhu, d\u0159\u00edve ne\u017e ji porovn\u00e1te s \u010d\u00edmkoli jin\u00fdm.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries.webp\" alt=\"7021-meze-v\u00fdb\u011bru\" class=\"wp-image-10696\" srcset=\"https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries.webp 800w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries-300x225.webp 300w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries-768x576.webp 768w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries-16x12.webp 16w, https:\/\/premiumalu.com\/wp-content\/uploads\/2026\/10\/7021-selection-boundaries-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Zvolte 7021, kdy\u017e:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00edl je forma, deska dutiny nebo n\u00e1strojov\u00e1 deska, kter\u00e1 mus\u00ed z\u016fstat rovn\u00e1 p\u0159i hlubok\u00fdch nebo nerovnom\u011brn\u00fdch \u0159ezech \u2014 specifikujte T651 tam, kde je odeb\u00edr\u00e1n\u00ed materi\u00e1lu t\u011b\u017ek\u00e9 nebo asymetrick\u00e9.<\/li>\n\n\n\n<li>D\u00edl mus\u00ed b\u00fdt sva\u0159ov\u00e1n a pot\u0159ebuje pevnost na \u00farovni 7xxx, kterou 6061 nem\u016f\u017ee poskytnout.<\/li>\n\n\n\n<li>Chcete rychlej\u0161\u00ed cyklov\u00e1n\u00ed forem ne\u017e u oceli, podlo\u017een\u00e9 tepelnou vodivost\u00ed 125\u2013155 W\/m\u00b7K.<\/li>\n\n\n\n<li>N\u00e1klady na obr\u00e1b\u011bn\u00ed na d\u00edl jsou d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e posledn\u00edch n\u011bkolik procent meze kluzu.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Vyhn\u011bte se 7021, kdy\u017e:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maxim\u00e1ln\u00ed pevnost rozhoduje o konstrukci a nic se nesva\u0159uje \u2014 <a href=\"https:\/\/premiumalu.com\/cs\/produkt\/slitina-hliniku-7075\/\">7075-T6<\/a> poskytuje p\u0159ibli\u017en\u011b o 30% vy\u0161\u0161\u00ed mez kluzu, co\u017e vyhovuje \u0161roubovan\u00fdm a n\u00fdtovan\u00fdm obr\u00e1b\u011bn\u00fdm d\u00edl\u016fm.<\/li>\n\n\n\n<li>Mez kluzu 276 MPa je dostate\u010dn\u00e1 \u2014 <a href=\"https:\/\/premiumalu.com\/cs\/produkt\/slitina-hliniku-6061\/\">6061-T6<\/a> z\u00edsk\u00e1te bezplatnou korozn\u00ed odolnost, snadn\u00e9 sva\u0159ov\u00e1n\u00ed a mnohem \u0161ir\u0161\u00ed dostupnost, a stabilita je m\u00e9n\u011b d\u016fle\u017eit\u00e1 tam, kde jsou \u0159ezy lehk\u00e9.<\/li>\n\n\n\n<li>D\u00edl bude nechr\u00e1n\u011bn\u00fd v humidn\u00edm, mo\u0159sk\u00e9m nebo chemick\u00e9m prost\u0159ed\u00ed \u2014 p\u0159ejd\u011bte na slitinu 5xxx nebo 6xxx.<\/li>\n\n\n\n<li>Nep\u0159etr\u017eit\u00fd provoz prob\u00edh\u00e1 nad p\u0159ibli\u017en\u011b 120 \u00b0C, kde p\u0159est\u00e1rnut\u00ed naru\u0161uje temper.<\/li>\n\n\n\n<li>D\u00edl vy\u017eaduje t\u011b\u017ek\u00e9 tv\u00e1\u0159en\u00ed po st\u00e1rnut\u00ed \u2014 7021-T6 nen\u00ed tv\u00e1\u0159ec\u00ed slitina; tva\u0159te ve stavu O a pot\u00e9 tepeln\u011b zpracujte.<\/li>\n\n\n\n<li>Nen\u00ed co obr\u00e1b\u011bt a nen\u00ed co sva\u0159ovat \u2014 v\u00fdhody slitiny nemaj\u00ed kde uplatnit.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Z\u00e1v\u011br<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">7021 zauj\u00edm\u00e1 specifick\u00e9 m\u00edsto v rodin\u011b 7xxx. Vzd\u00e1v\u00e1 se p\u0159ibli\u017en\u011b 30% meze kluzu 7075 a sv\u00e9 korozn\u00ed odolnosti odvozen\u00e9 od m\u011bdi, a v\u00fdm\u011bnou se \u010dist\u011b obr\u00e1b\u00ed, dr\u017e\u00ed tvar p\u0159i t\u011b\u017ek\u00fdch \u0159ezech a lze jej sva\u0159ovat \u2014 kombinace, kterou \u017e\u00e1dn\u00e1 jin\u00e1 slitina 7xxx nenab\u00edz\u00ed ve zcela stejn\u00e9m bal\u00ed\u010dku. To stoj\u00ed za to zaplatit u formov\u00e9 dutiny, bloku rozd\u011blova\u010de nebo velk\u00e9 obr\u00e1b\u011bn\u00e9 desky, a ne stoj\u00ed za to platit u d\u00edlu, kde je konstruk\u010dn\u00ed zat\u00ed\u017een\u00ed jedin\u00e9, na \u010dem z\u00e1le\u017e\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dod\u00e1v\u00e1me 7021 ve stavu T6 a T651 jako plech, ty\u010d, trubku a blok, s MTC ke ka\u017ed\u00e9 objedn\u00e1vce. Na\u0161e vlastn\u00ed CNC obr\u00e1b\u011bn\u00ed, sva\u0159ov\u00e1n\u00ed a anodizace pokr\u00fdvaj\u00ed kroky obr\u00e1b\u011bn\u00ed a spojov\u00e1n\u00ed, pro kter\u00e9 je tento stupe\u0148 obvykle specifikov\u00e1n, a vlastn\u00ed rozm\u011bry s n\u00edzk\u00fdm MOQ se vyr\u00e1b\u011bj\u00ed na zak\u00e1zku.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Po\u0161lete n\u00e1m sv\u016fj v\u00fdkres, formu a temper a potvrd\u00edme, co m\u016f\u017eeme dodat podle v\u00e1mi uveden\u00e9 normy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Jak\u00e9 je minim\u00e1ln\u00ed mno\u017estv\u00ed pro plech 7021 a jakou dodac\u00ed lh\u016ftu m\u00e1m pl\u00e1novat?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Rozm\u011bry vyr\u00e1b\u011bn\u00e9 na v\u00fdkres jsou zak\u00e1zkov\u00e1 v\u00fdroba s n\u00edzk\u00fdm MOQ, obvykle 10\u201360 dn\u00ed v z\u00e1vislosti na form\u011b, temperu a mno\u017estv\u00ed. Standardn\u00ed rozm\u011bry plechu a ty\u010d\u00ed se expeduj\u00ed ze skladu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Jak\u00e9 dokumenty doprov\u00e1zej\u00ed objedn\u00e1vku 7021?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hutn\u00ed osv\u011bd\u010den\u00ed (mill test certificate) uv\u00e1d\u011bj\u00edc\u00ed chemick\u00e9 a mechanick\u00e9 v\u00fdsledky pro tavbu, p\u0159ilo\u017een\u00e9 ke ka\u017ed\u00e9 z\u00e1silce. Pokud projekt vy\u017eaduje nez\u00e1visl\u00e9 ov\u011b\u0159en\u00ed, zpr\u00e1vy SGS lze zajistit na vy\u017e\u00e1d\u00e1n\u00ed za dodate\u010dn\u00e9 n\u00e1klady na testov\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u016f\u017eete obr\u00e1b\u011bt formov\u00e9 desky 7021 a dod\u00e1vat hotov\u00e9 d\u00edly?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ano \u2014 dutinov\u00e9 desky, bloky rozd\u011blova\u010de a up\u00ednac\u00ed desky se obr\u00e1b\u011bj\u00ed intern\u011b, tak\u017ee materi\u00e1l a obr\u00e1b\u011bn\u00ed se nab\u00edzej\u00ed spole\u010dn\u011b.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u016f\u017ee 7021 nahradit 7075 v existuj\u00edc\u00edm designu formy?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pouze pokud design nen\u00ed limitov\u00e1n pevnost\u00ed. 7021 se vzd\u00e1v\u00e1 p\u0159ibli\u017en\u011b 30% meze kluzu 7075, tak\u017ee dutinu dimenzovanou na tlou\u0161\u0165ky st\u011bn 7075 je t\u0159eba p\u0159epo\u010d\u00edtat. Tam, kde volbu \u0159\u00edd\u00ed doba obr\u00e1b\u011bn\u00ed, rovinnost a sva\u0159itelnost sp\u00ed\u0161e ne\u017e \u0161pi\u010dkov\u00e1 pevnost, se z\u00e1m\u011bna obvykle vyplat\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"<p>What Is 7021 Aluminum? 7021 is a heat-treatable Al-Zn-Mg alloy of the 7xxx family, registered as EN AW-7021 (AlZn5.5Mg1.5) and as UNS A97021. It is the 7xxx grade to reach for when the part has to hold tolerance through heavy machining, or has to be welded and still reach a 7xxx strength class \u2014 two [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10698,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"7021 Aluminum: The Ultimate Guide to Properties and Uses","_seopress_titles_desc":"A practical guide to 7021 aluminum: chemical composition, mechanical properties, T6\/T62\/T651 tempers, comparison with 7075 and 6061, and sourcing tips for aerospace and structural use.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[179],"tags":[],"class_list":["post-8805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-7000-series-aluminum"],"_links":{"self":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/8805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/comments?post=8805"}],"version-history":[{"count":5,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/8805\/revisions"}],"predecessor-version":[{"id":10715,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/8805\/revisions\/10715"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media\/10698"}],"wp:attachment":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media?parent=8805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/categories?post=8805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/tags?post=8805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}