{"id":2141,"date":"2021-05-07T12:26:20","date_gmt":"2021-05-07T12:26:20","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2141"},"modified":"2021-05-07T12:27:07","modified_gmt":"2021-05-07T12:27:07","slug":"whats-super304h-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/cs\/whats-super304h-steel\/","title":{"rendered":"Co je ocel Super 304H?"},"content":{"rendered":"

S v\u00fdvojem ultra-superkritick\u00fdch jednotek nebyla vysokoteplotn\u00ed pevnost tradi\u010dn\u00edch 18-8 austenitick\u00fdch nerezov\u00fdch ocel\u00ed (jako je ocel TP304H) schopna uspokojit jejich pot\u0159eby s parametry p\u00e1ry 600\u2103. Z tohoto d\u016fvodu spole\u010dnost Japan Sumitomo Metal Corporation vyvinula nov\u00e9 materi\u00e1ly pro povrchov\u00e9 potrub\u00ed topn\u00e9ho kotle jednotky, jako je ocel TP347HFG, ocel SUPER304H a ocel HR3C. Ocel Super 304H je nov\u00fdm typem oceli 18-8 ocel<\/a>, pou\u017e\u00edv\u00e1 se hlavn\u011b p\u0159i v\u00fdrob\u011b p\u0159eh\u0159\u00edv\u00e1k\u016f a p\u0159ih\u0159\u00edv\u00e1k\u016f ultra-superkritick\u00fdch kotl\u016f, jejich\u017e teplota kovov\u00e9 st\u011bny nep\u0159esahuje 700 \u2103. V sou\u010dasnosti vyr\u00e1b\u00ed podobn\u00e9 ocelov\u00e9 trubky jakosti DMV 304HCU tak\u00e9 Shasqida Mannesmann (d\u0159\u00edve DMV Company) v N\u011bmecku.<\/p>\n

Ocel Super304H je ocel sn\u00ed\u017een\u00edm obsahu Mn, Si, Cr a Ni na b\u00e1zi oceli TP304H, kter\u00e1 p\u0159id\u00e1v\u00e1 2,5% ~ 3,5% Cu a 0,30%~0,60% Nb a 0,05%~0,12% N, tak\u017ee pro vytvo\u0159en\u00ed dif\u00fazn\u00ed precipita\u010dn\u00ed f\u00e1ze a zpevn\u011bn\u00e9 f\u00e1ze bohat\u00e9 na m\u011b\u010f v provozu doch\u00e1z\u00ed k precipita\u010dn\u00edmu zpevn\u011bn\u00ed pomoc\u00ed NbC(N), NbCrN a M23C6, co\u017e zna\u010dn\u011b zvy\u0161uje dovolen\u00e9 nap\u011bt\u00ed p\u0159i provozn\u00ed teplot\u011b a povolen\u00e9 nap\u011bt\u00ed p\u0159i 600 ~ 650 \u2103 je o 30% vy\u0161\u0161\u00ed ne\u017e ocel TP347H. Odolnost oceli proti oxidaci p\u00e1rou je srovnateln\u00e1 s odolnost\u00ed oceli TP347HFG a v\u00fdrazn\u011b lep\u0161\u00ed ne\u017e u oceli TP321H. Byl uveden v ASME Code Case 2328-1, ASTM A-213 Standard, \u010d\u00edslo je S30432.<\/p>\n

 <\/p>\n

Chemick\u00e9 slo\u017een\u00ed Super 304H<\/strong><\/p>\n\n\n\n\n
C<\/td>\nSi<\/td>\nMn<\/td>\nP<\/td>\nS<\/td>\nCr<\/td>\nNi<\/td>\nN<\/td>\nAl<\/td>\nB<\/td>\nNb<\/td>\nCu<\/td>\nPROTI<\/td>\nMo<\/td>\n<\/tr>\n
0.08<\/td>\n0.21<\/td>\n0.79<\/td>\n0.03<\/td>\n0.001<\/td>\n18.42<\/td>\n8.66<\/td>\n0.11<\/td>\n0.007<\/td>\n0.004<\/td>\n0.5<\/td>\n2.77<\/td>\n0.04<\/td>\n0.35<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Mechanick\u00e1 vlastnost Super 304H<\/strong><\/p>\n\n\n\n\n
Mez kluzu, Mpa<\/td>\nPevnost v tahu, Mpa<\/td>\nProdlou\u017een\u00ed, %<\/td>\n<\/tr>\n
360\/350<\/td>\n640\/645<\/td>\n58\/60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Vzhledem k vysok\u00fdm parametr\u016fm p\u00e1ry ultrasuperkritick\u00fdch jednotek nab\u00fdv\u00e1 na d\u016fle\u017eitosti oxida\u010dn\u00ed odolnost oceli pou\u017e\u00edvan\u00e9 ve vysokoteplotn\u00edch tlakov\u00fdch \u010d\u00e1stech elektr\u00e1ren. Obecn\u011b je vnit\u0159n\u00ed st\u011bna ocelov\u00e9 trubky super 304H otrysk\u00e1na brokem, aby se zlep\u0161ila \u00fa\u010dinnost proti oxidaci p\u00e1ry. Na vnit\u0159n\u00edm povrchu ocelov\u00e9 trubky byla vytvo\u0159ena tryskan\u00e1 vrstva o tlou\u0161\u0165ce 30 \u03bcm a jej\u00ed mikrostruktura byla zjemn\u011bna ve srovn\u00e1n\u00ed s mikrostrukturou nebrou\u0161en\u00e9 ocelov\u00e9 trubky. Po testu oxidace p\u00e1rou p\u0159i 650 \u00b0C a 600 h je tlou\u0161\u0165ka oxidov\u00e9 vrstvy ocelov\u00e9 trubky o\u0161et\u0159en\u00e9 trysk\u00e1n\u00edm ten\u010d\u00ed a hust\u0161\u00ed a odolnost ocelov\u00e9 trubky v\u016f\u010di oxidaci p\u00e1rou je zlep\u0161ena. V sou\u010dasn\u00e9 dob\u011b vyr\u00e1b\u00ed n\u011bkolik p\u0159edn\u00edch ocel\u00e1ren v \u010c\u00edn\u011b podobnou jakost 10CrL8Ni9NbCu3Bn, specifikovanou v GB 5310-2008, kter\u00e1 se v sou\u010dasnosti pou\u017e\u00edv\u00e1 v n\u011bkolika projektech ultrasuperkritick\u00fdch jednotek v \u010c\u00edn\u011b.<\/p>","protected":false},"excerpt":{"rendered":"

S v\u00fdvojem ultra-superkritick\u00fdch jednotek nebyla vysokoteplotn\u00ed pevnost tradi\u010dn\u00edch 18-8 austenitick\u00fdch nerezov\u00fdch ocel\u00ed (jako je ocel TP304H) schopna uspokojit jejich pot\u0159eby s parametry p\u00e1ry 600\u2103. Z tohoto d\u016fvodu spole\u010dnost Japan Sumitomo Metal Corporation vyvinula nov\u00e9 materi\u00e1ly pro potrub\u00ed topn\u00e9 plochy kotle jednotky, jako je ocel TP347HFG, SUPER304H [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2141","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2141","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=2141"}],"version-history":[{"count":2,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2141\/revisions"}],"predecessor-version":[{"id":2143,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/posts\/2141\/revisions\/2143"}],"wp:attachment":[{"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/media?parent=2141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/categories?post=2141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wldstainless.com\/cs\/wp-json\/wp\/v2\/tags?post=2141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}