{"id":3645,"date":"2016-10-05T08:57:06","date_gmt":"2016-10-05T08:57:06","guid":{"rendered":"http:\/\/ausasteel.irantzu.com\/la-influencia-de-los-componentes-en-los-aceros-especiales-2\/"},"modified":"2014-12-16T17:37:16","modified_gmt":"2014-12-16T17:37:16","slug":"influenta-compozitiei-asupra-otelurilor-speciale","status":"publish","type":"post","link":"https:\/\/www.ausasteel.com\/ro\/influenta-compozitiei-asupra-otelurilor-speciale\/","title":{"rendered":"Influen\u021ba compozi\u021biei asupra o\u021belurilor speciale"},"content":{"rendered":"

\"Influen\u021ba<\/a><\/p>\n

O\u021belurile speciale<\/strong> sunt o\u021beluri carbon care, prin aliere cu alte metale, \u00ee\u0219i \u00eembun\u0103t\u0103\u021besc caracteristicile.<\/p>\n

\u00cen compozi\u021bia o\u021belurilor speciale, <\/strong> \u00een afar\u0103 de carbon, mangan \u0219i siliciu exist\u0103 \u0219i alte<\/strong> elemente chimice care, <\/strong> \u00eentr-o propor\u021bie mai mare sau mai mic\u0103, \u00eei confer\u0103 acestuia anumite propriet\u0103\u021bi fizico-chimice<\/strong>, care pot fi extrem de utile pentru utilizarea sa ulterioar\u0103.<\/p>\n

Influen\u021ba componentelor o\u021belurilor speciale<\/h2>\n

– Aluminiu (Al)<\/strong>: folosit \u00een cantit\u0103\u021bi mici ac\u021bioneaz\u0103 ca dezoxidant pentru o\u021belul topit \u0219i af\u00e2neaz\u0103 granula\u021bia o\u021belurilor austenice: dimensiunea cristalelor care compun o\u021belul la temperaturi de austenizare.<\/p>\n

Granula\u021bia cea mai mare a o\u021belurilor se va specifica cu num\u0103rul 1, iar cea mai fin\u0103, cu num\u0103rul 8. Un bun o\u021bel trebuie s\u0103 aib\u0103 o granula\u021bie de la 6 \u00een sus<\/strong>. Este un element de aliere la o\u021belurile de nitrurare.<\/p>\n

– Sulf (S): <\/strong>punct de topite2622 grade C produce cea mai importanta segregare in otelurile aliate \u00een mod normal, este o impuritate \u0219i se men\u021bine la nivel sc\u0103zut. Cu toate acestea, uneori se adaug\u0103 inten\u021bionat \u00een mari cantit\u0103\u021bi (0,06 a 0,30%) la otelurile pentru automate pentru a m\u0103ri prelucrabilitatea lor sulful creste posibilitatea de fisurare la sudura.<\/p>\n

– Bor (B): <\/strong>punct de topire 2300 grade C ad\u0103ugat \u00een cantit\u0103\u021bi nesemnificative, m\u0103re\u0219te <\/strong>considerabil c\u0103libilitatea o\u021belurilor \u0219i,<\/strong> \u00een anumite condi\u021bii, cre\u0219te duritatea o\u021belurilor inoxidabile<\/strong>. Se foloseste ca element de aliere pentru otelurile cu destinatie suruburi si piulite.<\/p>\n

– Carbon (C): punct de topire 3540 grade C<\/strong> este cel mai important element de aliere al otelului. Pe m\u0103sur\u0103 ce procentul s\u0103u cre\u0219te in compozitia otelului acestuia, i se m\u0103re\u0219te rezisten\u021ba, limita de elasticitate \u0219i duritatea<\/strong>. Mic\u0219oreaz\u0103 ductilitatea \u0219i maleabilitatea.<\/p>\n

– Zirconiu (Zr): punct de topire 1860 grade C, <\/strong>este un element de aliere dezoxidant \u0219i de af\u00e2nare a granula\u021biei<\/strong>. \u00cembun\u0103t\u0103\u021be\u0219te caracteristicile sale de ambutisare.<\/p>\n

– Cobalt (Co)<\/strong>: punct de topire 1492 grade C, cobaltul reduce ad\u00e2ncimea c\u0103lirii. M\u0103re\u0219te rezisten\u021ba la coroziune \u0219i abraziune<\/strong>. Confer\u0103 o rezisten\u021b\u0103 mai bun\u0103 la trac\u021biune \u0219i o mai bun\u0103 limit\u0103 elastic\u0103. Cobaltul imbunatateste substantial rezistenta la temperaturi ridicate,este folosit frecvent ca element de aliere la obtinerea otelurilor rapide.<\/p>\n

– Cupru (Cu)<\/strong>: punct de topire 1048 grade C, cuprul se adauga doar la citeva marci de otel. Are un efect nefavorabil in procesele de deformare plastica la cald,provoaca fisuri si crapaturi. Este in general un element nedorit in oteluri.La otelurile aliate cu cupru acesta \u00eembun\u0103t\u0103\u021be\u0219te semnificativ rezisten\u021ba la coroziune<\/strong>a atmosferic\u0103<\/strong>.si la acizi. Confer\u0103 fragilitate o\u021belului \u00een timpul opera\u021biunilor de forjare \u0219i laminare, motiv pentru care, nu se adaug\u0103 ca element de aliere. La piesele turnate, care nu trebuie lucrate la cald, se adaug\u0103 pentru a-i cre\u0219te duritatea. Aceast\u0103 cre\u0219tere a durit\u0103\u021bii este cunoscut\u0103 sub denumirea de \u00eent\u0103rire secundar\u0103.<\/p>\n

– Crom\u00a0(Cr): punct de topire 1920 grade C, <\/strong>cromul creste calibilitatea otelurilor.In procent de peste 12% adaugat in otel , \u00eembun\u0103t\u0103\u021be\u0219te rezisten\u021ba la uzur\u0103 \u0219i la coroziune<\/strong>. La temperaturi \u00eenalte, cre\u0219te rezisten\u021ba mecanic\u0103.Cromul este agent de formare a carburilor in otel.<\/p>\n

– Fosfor <\/strong>(P)<\/strong>: punct de topire 44 grade C fosforul este una dintre otr\u0103vurile o\u021belului. Pentru ca un o\u021bel s\u0103 aib\u0103 o calitate superioar\u0103, nu trebuie s\u0103 con\u021bin\u0103 cantit\u0103\u021bi care s\u0103 dep\u0103\u0219easc\u0103 0,03 %. Cre\u0219te rezisten\u021ba \u0219i duritatea la o\u021belurile cu un con\u021binut sc\u0103zut \u00een carbon, \u00eembun\u0103t\u0103\u021be\u0219te u\u0219or rezisten\u021ba la coroziune, \u00eembun\u0103t\u0103\u021be\u0219te, \u00eentr-o anumit\u0103 m\u0103sur\u0103, prelucrabilitatea (capacitatea de a fi lucrat prin t\u0103iere) \u0219i \u00eei mic\u0219oreaz\u0103 tenacitatea.<\/p>\n

– Hidrogen (H): punct de topire -262 grade C ,<\/strong>este un element nociv. Produce fragilitatea o\u021belului<\/strong>. Hidrogenul provoaca in otel aparitia fulgilor, defect deosebit de periculos .<\/p>\n

– Mangan (Mn): punct de topire 1221 grade C, este un e<\/strong>lement de baz\u0103 \u00een toate o\u021belurile<\/strong>. Ac\u021bioneaz\u0103 c\u0103 dezoxidant \u0219i<\/strong> neutralizeaz\u0103, de asemenea, efectele nocive ale sulfului<\/strong>, u\u0219ur\u00e2nd laminarea, turnarea \u0219i alte opera\u021biuni de lucru la cald. Totodat\u0103, m\u0103re\u0219te penetrarea la c\u0103lire \u0219i contribuie la rezisten\u021ba \u0219i duritatea o\u021belului. \u00cen cazul unor con\u021binuturi \u00eenalte, cre\u0219te rezisten\u021ba sa la uzur\u0103.<\/p>\n

– Molibden (Mo)<\/strong>: punct de topire 2622 grade C, se adauga in otel impreuna cu alte elemente de aliere pentru cresterea calibilitatii, \u00eembun\u0103t\u0103\u021be\u0219te caracteristicile de prelucrare prin aschiere, creste rezistenta la tractiune si reduce fragilitatea otelurilor.Creste rezistenta la coroziune si se foloseste frecvent in compozitia otelurilor aliate Cr Ni<\/strong>. De asemenea, m\u0103re\u0219te duritatea \u0219i rezisten\u021ba la temperaturi \u00eenalte. Previne fragilitatea la revenire.<\/p>\n

– Niobiu (Nb)<\/strong>: punct de topire 2968 grade C, niobiul af\u00e2neaz\u0103 granula\u021bia o\u021belurilor<\/strong>. Cre\u0219te rezilien\u021ba la temperaturi sc\u0103zute. \u00cen cazul o\u021belurilor cu un con\u021binut sc\u0103zut \u00een carbon, cre\u0219te rezisten\u021ba acestora \u0219i limita elastic\u0103.Este folosit ca stabilizator la otelurile rezistente chimic.Se foloseste la otelurile austenitice pentru cazane .<\/p>\n

– Nichel (Ni)<\/strong>: punct de topire 1453 grade C, nichelul cre\u0219te rezisten\u021ba o\u021belurilor nec\u0103lite \u0219i confer\u0103 tenacitate<\/strong>, \u00een special la temperaturi sc\u0103zute. \u00cembun\u0103t\u0103\u021be\u0219te rezisten\u021ba la coroziune. Prin folosire \u00eempreun\u0103 cu cromul, cre\u0219te duritatea \u0219i rezisten\u021ba la uzur\u0103. Inhib\u0103 cre\u0219terea granula\u021biei o\u021belului c\u00e2nd acesta se \u00eenc\u0103lze\u0219te.<\/p>\n

– Azot (N): punct de topire – 210 grade C, <\/strong>azotul controleaz\u0103 granula\u021bia. Cre\u0219te c\u0103libilitatea \u0219i rezisten\u021ba <\/strong> anumitor o\u021beluri inoxidabile.Ca element de aliere in otel extinde faza gama si stabilizeaza structura austenitica.In urma tratamentului de nitrurare azotul permite obtinerea unei duritati mari la suprafata produsului.<\/p>\n

– Oxigen (O): punct de topire -218 grade C<\/strong>, oxigenul este un element nociv nedorit in oteluri<\/strong>. Cre\u0219te fragilitatea o\u021belului \u0219i mic\u0219oreaz\u0103 rezisten\u021ba la \u0219oc.<\/p>\n

– Plumb (Pb): <\/strong> punct de topire 327,4 grade C,<\/strong>prin ad\u0103ugarea de plumb in procent de 0,20-0,50% se \u00eembun\u0103t\u0103\u021be\u0219te prelucrabilitatea otelurilor.<\/strong><\/p>\n

– Siliciu <\/strong>(Si)<\/strong>: punct de topire 1414 grade C, se folose\u0219te ca dezoxidant \u0219i \u00eembun\u0103t\u0103\u021be\u0219te c\u0103libilitatea<\/strong> (ad\u00e2ncimea p\u00e2n\u0103 la care un o\u021bel poate fi \u00eent\u0103rit) la o\u021belurile cu elemente nedorite. Cre\u0219te rezisten\u021ba o\u021belurilor cu con\u021binut sc\u0103zut \u00een carbon.Creste limita de elasticitate fiind un element de aliere pentru otelurile de ARC.<\/p>\n

– Telur (Te): punct de topire 449,5 grade C, <\/strong>aliat cu o\u021belul \u00een foarte mici propor\u021bii, \u00eei \u00eembun\u0103t\u0103\u021be\u0219te \u0219i prelucrabilitatea<\/strong>.<\/p>\n

– Titan (Ti)<\/strong>: punct de topire 1727 grade C, se utilizeaz\u0103 ca dezoxidant \u0219i pentru a inhiba cre\u0219terea granular\u0103<\/strong>. De asemenea, cre\u0219te rezisten\u021ba la temperaturi \u00eenalte. Previne pierderea de crom, \u00een anumite zone, a o\u021belurilor inoxidabile \u00een timpul \u00eenc\u0103lzirilor foarte prelungite.Este folosit ca element de aliere la obtinerea otelurilor inoxidabile fiind un element de formare a carburilor.<\/p>\n

– Vanadiu (V): <\/strong>punct de topire 1726 grade C, \u00een cantit\u0103\u021bi reduse, de maximum 010-0,12 %, m\u0103re\u0219te c\u0103libilitatea \u0219i af\u00e2neaz\u0103 granula\u021bia o\u021belurilor<\/strong>. M\u0103re\u0219te rezisten\u021ba la impact (rezisten\u021ba la rupere prin impact) \u0219i, de asemenea, rezisten\u021ba la oboseal\u0103 a metalului. \u00cembun\u0103t\u0103\u021be\u0219te rezisten\u021ba o\u021belurilor cu un con\u021binut sc\u0103zut \u00een carbon.<\/p>\n

– Wolfram sau tungsten (W)<\/strong>: punct de topire 3380 grade C, se folose\u0219te la multe o\u021beluri aliate pentru unelte, conferindu-le o mare rezisten\u021b\u0103 la uzur\u0103 \u0219i duritate la temperaturi \u00eenalte<\/strong>. \u00cembun\u0103t\u0103\u021be\u0219te duritatea la temperaturi \u00eenalte a o\u021belurilor.<\/p>\n

Elementele chimice: fosfor<\/strong>, sulf<\/strong>, oxigen<\/strong>, azot<\/strong> \u0219i hidrogen<\/strong> pot s\u0103 scad\u0103 \u00een timpul procesului de topire a otelului.<\/p>\n

Cuprul<\/strong>, arsenicul<\/strong>, antimoniul<\/strong> \u0219i staniul<\/strong> fac parte din fierul vechi \u0219i sunt imposibil de eliminat \u00een procesul de topire. Singura posibilitate de ap\u0103rare \u00eempotriva acestor elemente const\u0103 \u00eentr-o selec\u021bie minu\u021bioas\u0103 a fierului vechi \u0219i \u00een folosirea de material virgin.<\/p>\n

\u021ai-a pl\u0103cut aceast\u0103 lectur\u0103?<\/strong> Dac\u0103 \u021bi-a pl\u0103cut, al\u0103tur\u0103-te comunit\u0103\u021bii noastre de abona\u021bi<\/strong>. Vei primi materialele noastre pe e-mail de fiecare dat\u0103 c\u00e2nd vom publica noi informa\u021bii.<\/p>\n

Dac\u0103 \u021bi se pare un material bun, al\u0103tur\u0103-te comunit\u0103\u021bii noastre de abona\u021bi<\/strong>. Vei primi mesajele noastre pe e-mailul t\u0103u de fiecare dat\u0103 c\u00e2nd post\u0103m informa\u021bii noi.<\/p>\n

Dac\u0103 \u021bi s-a p\u0103rut un material bun, trimite aceast\u0103 postare <\/strong> \u0219i prietenilor t\u0103i, pe re\u021belele sociale.<\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

O\u021belurile speciale<\/strong> sunt o\u021beluri carbon care, prin aliere cu alte metale, \u00ee\u0219i \u00eembun\u0103t\u0103\u021besc caracteristicile.<\/p>\n","protected":false},"author":4,"featured_media":3648,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-3645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articole"],"yoast_head":"\nInfluen\u021ba compozi\u021biei asupra o\u021belurilor speciale - AUSA special steels<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ausasteel.com\/ro\/influenta-compozitiei-asupra-otelurilor-speciale\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Influen\u021ba compozi\u021biei asupra o\u021belurilor speciale - 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