{"id":16800,"date":"2026-07-21T21:40:12","date_gmt":"2026-07-21T13:40:12","guid":{"rendered":"https:\/\/aobosteel.com\/?p=16800"},"modified":"2026-07-23T20:51:05","modified_gmt":"2026-07-23T12:51:05","slug":"d2-tool-steel-sendzimir-cluster-mill-rolls","status":"publish","type":"post","link":"https:\/\/aobosteel.com\/pt\/blog\/d2-tool-steel-sendzimir-cluster-mill-rolls\/","title":{"rendered":"Por que o D2 \u00e9 a escolha padr\u00e3o para os cilindros de trabalho do moinho cluster da Sendzimir?"},"content":{"rendered":"<h1 id=\"h-why-aisi-d2-tool-steel-is-the-standard-choice-for-sendzimir-cluster-mill-work-rolls\" class=\"wp-block-heading has-large-font-size\">Por que o a\u00e7o ferramenta AISI D2 \u00e9 a escolha padr\u00e3o para os cilindros de trabalho do moinho de cluster Sendzimir?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Os laminadores a frio que utilizam a configura\u00e7\u00e3o Sendzimir, comumente chamados de laminadores cluster 20-High ou Z-Hi, s\u00e3o constru\u00eddos em torno de uma decis\u00e3o de projeto fundamental: os cilindros de trabalho s\u00e3o fabricados com di\u00e2metro deliberadamente pequeno. Um cilindro de trabalho menor reduz a for\u00e7a de lamina\u00e7\u00e3o necess\u00e1ria para reduzir a espessura da tira, diminui o consumo de energia e reduz o espalhamento lateral do material \u00e0 medida que ele passa pelo suporte. \u00c9 isso que torna os laminadores cluster t\u00e3o eficazes para a lamina\u00e7\u00e3o de tiras e chapas finas, duras ou de alta resist\u00eancia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A desvantagem \u00e9 mec\u00e2nica. Um cilindro fino sob carga pesada tende a se curvar. Sem suporte, essa deflex\u00e3o comprometeria o controle da espessura e, eventualmente, causaria rachaduras no pr\u00f3prio cilindro. Os projetos de laminadores em cluster resolvem esse problema aninhando o cilindro de trabalho dentro de uma pilha completa de cilindros intermedi\u00e1rios, que, por sua vez, transferem a carga de lamina\u00e7\u00e3o para cilindros de apoio maiores e uma estrutura r\u00edgida. O cilindro de trabalho nunca precisa resistir \u00e0 flex\u00e3o por si s\u00f3. Ele s\u00f3 precisa suportar compress\u00e3o, desgaste e contato superficial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esse \u00fanico detalhe do projeto muda o que significa &quot;o a\u00e7o certo&quot; para essa aplica\u00e7\u00e3o, e \u00e9 por isso que... <a href=\"https:\/\/aobosteel.com\/pt\/d2-tool-steel\/\">AISI D2<\/a> Tem sido o material padr\u00e3o para cilindros de trabalho e cilindros intermedi\u00e1rios nesses equipamentos por d\u00e9cadas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tanto o laminador 20-Hi quanto o Z-Hi compartilham o mesmo conjunto de cilindros e caminho de for\u00e7a. A \u00fanica diferen\u00e7a estrutural est\u00e1 no pr\u00f3prio cilindro de trabalho: os cilindros de trabalho do Z-Hi podem ser retirados lateralmente para uma troca r\u00e1pida, sem a necessidade de desmontar o suporte.<\/p>\n\n\n\n<div style=\"max-width:680px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n<h3 style=\"text-align:center;font-size:15px;font-weight:500;margin:0 0 4px;color:#2C2C2A;\">Laminador a frio Z-Hi \u00b7 Tipo de extra\u00e7\u00e3o lateral<\/h3>\n<p style=\"text-align:center;font-size:12px;color:#5F5E5A;margin:0 0 12px;\">Mesmo cluster que o 20-Hi; os rolos de trabalho se retiram lateralmente para troca r\u00e1pida.<\/p>\n\n<svg viewbox=\"0 0 680 500\" width=\"100%\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n<title>Laminador a frio Z-Hi \u2014 Estado operacional com troca r\u00e1pida de cilindros<\/title>\n<desc>Anima\u00e7\u00e3o em corte transversal de um laminador a frio Z-Hi. O conjunto de cilindros \u00e9 o mesmo do 20-Hi, mas os cilindros de trabalho podem ser retra\u00eddos lateralmente para uma troca r\u00e1pida. A anima\u00e7\u00e3o mostra o cilindro de trabalho superior deslizando para fora e retornando. 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href=\"#z20bk\"\/><\/g><\/g>\n<g transform=\"translate(380,105)\"><g class=\"z20-cw\"><use href=\"#z20bk\"\/><\/g><\/g>\n<g transform=\"translate(460,105)\"><g class=\"z20-cw\"><use href=\"#z20bk\"\/><\/g><\/g>\n\n<g transform=\"translate(283,154)\"><g class=\"z20-ccw\"><use href=\"#z20i2\"\/><\/g><\/g>\n<g transform=\"translate(340,184)\"><g class=\"z20-ccw\"><use href=\"#z20i2\"\/><\/g><\/g>\n<g transform=\"translate(397,154)\"><g class=\"z20-ccw\"><use href=\"#z20i2\"\/><\/g><\/g>\n\n<g transform=\"translate(316,200)\"><g class=\"z20-cw\"><use href=\"#z20i1\"\/><\/g><\/g>\n<g transform=\"translate(364,200)\"><g class=\"z20-cw\"><use href=\"#z20i1\"\/><\/g><\/g>\n\n<g transform=\"translate(340,268)\"><g class=\"z20-cw\"><use href=\"#z20wr\"\/><\/g><\/g>\n\n<g transform=\"translate(316,300)\"><g class=\"z20-ccw\"><use href=\"#z20i1\"\/><\/g><\/g>\n<g transform=\"translate(364,300)\"><g class=\"z20-ccw\"><use href=\"#z20i1\"\/><\/g><\/g>\n\n<g transform=\"translate(283,346)\"><g class=\"z20-cw\"><use href=\"#z20i2\"\/><\/g><\/g>\n<g transform=\"translate(340,316)\"><g class=\"z20-cw\"><use href=\"#z20i2\"\/><\/g><\/g>\n<g transform=\"translate(397,346)\"><g class=\"z20-cw\"><use href=\"#z20i2\"\/><\/g><\/g>\n\n<g transform=\"translate(220,395)\"><g class=\"z20-ccw\"><use href=\"#z20bk\"\/><\/g><\/g>\n<g transform=\"translate(300,395)\"><g class=\"z20-ccw\"><use href=\"#z20bk\"\/><\/g><\/g>\n<g transform=\"translate(380,395)\"><g class=\"z20-ccw\"><use href=\"#z20bk\"\/><\/g><\/g>\n<g transform=\"translate(460,395)\"><g class=\"z20-ccw\"><use href=\"#z20bk\"\/><\/g><\/g>\n\n<line x1=\"356\" y1=\"232\" x2=\"504\" y2=\"232\" class=\"z20-track\"\/>\n<circle cx=\"520\" cy=\"232\" r=\"16\" fill=\"none\" stroke=\"#D85A30\" stroke-width=\"0.8\" stroke-dasharray=\"3 2\"\/>\n<path d=\"M 440 222 L 480 222\" stroke=\"#D85A30\" stroke-width=\"1.5\" fill=\"none\" stroke-linecap=\"round\" marker-end=\"url(#z2a)\"\/>\n<text x=\"520\" y=\"208\" class=\"z20-t z20-acc\" text-anchor=\"middle\">Troca r\u00e1pida de rolo<\/text>\n\n<g class=\"z20-ro\"><g class=\"z20-ccw\"><use href=\"#z20wr\"\/><\/g><\/g>\n<\/svg>\n\n<div style=\"display:flex;flex-wrap:wrap;gap:14px;justify-content:center;align-items:center;margin-top:14px;font-size:12px;color:#444441;\">\n<div style=\"display:flex;align-items:center;gap:6px;\"><span style=\"display:inline-block;width:14px;height:14px;border-radius:50%;background:#888780;border:1px solid #2C2C2A;\"><\/span>Rolamentos de apoio \u00d7 8<\/div>\n<div style=\"display:flex;align-items:center;gap:6px;\"><span style=\"display:inline-block;width:14px;height:14px;border-radius:50%;background:#9FE1CB;border:1px solid #0F6E56;\"><\/span>2\u00ba n\u00edvel intermedi\u00e1rio \u00d7 6<\/div>\n<div style=\"display:flex;align-items:center;gap:6px;\"><span style=\"display:inline-block;width:14px;height:14px;border-radius:50%;background:#D3D1C7;border:1px solid #5F5E5A;\"><\/span>1\u00ba n\u00edvel intermedi\u00e1rio \u00d7 4<\/div>\n<div style=\"display:flex;align-items:center;gap:6px;\"><span style=\"display:inline-block;width:14px;height:14px;border-radius:50%;background:#B4B2A9;border:1px solid #444441;\"><\/span>Rolos de trabalho \u00d7 2 (remov\u00edveis)<\/div>\n<div style=\"display:flex;align-items:center;gap:6px;\"><span style=\"display:inline-block;width:20px;height:4px;background:#534AB7;\"><\/span>Tira (revers\u00edvel)<\/div>\n<\/div>\n\n<p style=\"text-align:center;font-size:11px;color:#5F5E5A;margin:10px 0 0;\">Z-Hi = Cluster 20-Hi + rolos de trabalho com extra\u00e7\u00e3o lateral \u2014 troca de rolos em minutos, sem desmontagem<\/p>\n<\/div>\n\n\n\n<h2 id=\"h-what-d2-s-chemistry-actually-delivers-at-the-roll-surface\" class=\"wp-block-heading\">O que a qu\u00edmica do D2 realmente proporciona na superf\u00edcie de rolamento<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A lamina\u00e7\u00e3o a frio exerce uma press\u00e3o superficial extrema sobre o cilindro a cada passagem da tira pela abertura. O cilindro precisa manter a precis\u00e3o dimensional ao longo de longos per\u00edodos de produ\u00e7\u00e3o, resistindo ao desgaste abrasivo da superf\u00edcie da tira. Portanto, o a\u00e7o necessita de alta resist\u00eancia \u00e0 compress\u00e3o e uma microestrutura dura e est\u00e1vel, em vez de apenas tenacidade bruta.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o D2 foi projetado exatamente para essa combina\u00e7\u00e3o. Sua composi\u00e7\u00e3o \u00e9 de aproximadamente 1,5% de carbono e 11,5 a 12,0% de cromo, com pequenas adi\u00e7\u00f5es de molibd\u00eanio e van\u00e1dio. Essa composi\u00e7\u00e3o qu\u00edmica produz um campo denso de carbonetos M7C3 grosseiros e ricos em cromo, fixados em uma matriz martens\u00edtica temperada. Os carbonetos s\u00e3o o que conferem ao D2 sua resist\u00eancia ao desgaste: eles s\u00e3o duros o suficiente para resistir ao contato abrasivo constante entre o cilindro e a tira, ciclo ap\u00f3s ciclo, sem danificar a superf\u00edcie do cilindro. A matriz temperada ao redor deles suporta a carga de compress\u00e3o e mant\u00e9m o cilindro dimensionalmente est\u00e1vel sob press\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 por isso que o D2 \u00e9 classificado como um a\u00e7o de t\u00eampera ao ar. Ele atinge a dureza m\u00e1xima em toda a sua espessura com t\u00eampera ao ar, em vez de t\u00eampera em \u00f3leo ou \u00e1gua, o que mant\u00e9m a distor\u00e7\u00e3o baixa durante o tratamento t\u00e9rmico. Para um cilindro retificado com precis\u00e3o e se\u00e7\u00e3o transversal de D75 mm, essa estabilidade dimensional durante a t\u00eampera n\u00e3o \u00e9 um detalhe insignificante. \u00c9 o que mant\u00e9m o cilindro acabado redondo, reto e dentro da toler\u00e2ncia antes mesmo de entrar na usinagem.<\/p>\n\n\n\n<h2 id=\"h-sizing-and-hardness-in-practice\" class=\"wp-block-heading\">Dimensionamento e dureza na pr\u00e1tica<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O a\u00e7o D2 abrange uma ampla faixa de trabalho em aplica\u00e7\u00f5es de lamina\u00e7\u00e3o em cluster, de aproximadamente 6,4 mm at\u00e9 300 mm de di\u00e2metro, o que \u00e9 suficiente para atender tanto os cilindros de trabalho mais finos quanto os cilindros intermedi\u00e1rios um pouco maiores no mesmo passe. Os objetivos do tratamento t\u00e9rmico diferem ligeiramente entre os dois tipos de cilindros. Os cilindros de trabalho s\u00e3o normalmente endurecidos a 58 a 64 HRC, j\u00e1 que suportam a carga de compress\u00e3o direta contra a tira. Os cilindros intermedi\u00e1rios e de acionamento, que sofrem mais fadiga por contato ao longo de sua vida \u00fatil, geralmente s\u00e3o fabricados com uma dureza ligeiramente menor, na faixa de 58 a 62 HRC, para equilibrar a resist\u00eancia ao desgaste com a vida \u00fatil \u00e0 fadiga.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esses n\u00fameros n\u00e3o s\u00e3o arbitr\u00e1rios. Eles refletem uma compreens\u00e3o pr\u00e1tica de como os a\u00e7os martens\u00edticos ricos em carbonetos se comportam sob tens\u00e3o de contato hertziana repetida, e essa compreens\u00e3o \u00e9 o que diferencia um rolo laminado que atende \u00e0s especifica\u00e7\u00f5es de um que lasca ou se despeda\u00e7a precocemente em servi\u00e7o.<\/p>\n\n\n\n<h2 id=\"h-why-brittleness-stops-being-a-limitation-here\" class=\"wp-block-heading\">Por que a fragilidade deixa de ser uma limita\u00e7\u00e3o aqui<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A principal fragilidade do a\u00e7o D2 \u00e9 a sua tenacidade. O alto teor de carbonetos, que proporciona resist\u00eancia ao desgaste, tamb\u00e9m torna o a\u00e7o quebradi\u00e7o nas bordas, raz\u00e3o pela qual o D2 raramente \u00e9 usado como cilindro maci\u00e7o em laminadores convencionais, onde o corpo do cilindro precisa resistir \u00e0 flex\u00e3o e \u00e0 tens\u00e3o de tra\u00e7\u00e3o em toda a sua extens\u00e3o. Em um laminador de dois ou quatro cilindros, essa fragilidade seria um problema s\u00e9rio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A geometria do laminador cluster elimina o problema em vez de contorn\u00e1-lo. Como os cilindros de apoio absorvem as componentes vertical e horizontal da for\u00e7a de lamina\u00e7\u00e3o, o pr\u00f3prio cilindro de trabalho nunca \u00e9 submetido \u00e0 flex\u00e3o. Ele permanece em pura compress\u00e3o, totalmente suportado ao longo de seu comprimento pelo conjunto de cilindros intermedi\u00e1rios. Ao eliminar quase toda a tens\u00e3o de flex\u00e3o e tra\u00e7\u00e3o do caminho da carga, a fragilidade do a\u00e7o D2 deixa de ser um risco de projeto. O que resta \u00e9 a propriedade na qual o D2 sempre foi mais forte: resistir ao desgaste e manter a dureza sob carga compressiva. O projeto Sendzimir e a metalurgia foram, na pr\u00e1tica, feitos um para o outro.<\/p>\n\n\n\n<h2 id=\"h-specifying-d2-bar-for-roll-manufacturing\" class=\"wp-block-heading\">Especificando a barra D2 para fabrica\u00e7\u00e3o de rolos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Os fabricantes de cilindros de lamina\u00e7\u00e3o que encomendam barras D2 para esta aplica\u00e7\u00e3o normalmente especificam barras redondas descascadas e recozidas, visto que a condi\u00e7\u00e3o recozida proporciona \u00e0 oficina de cilindros uma dureza inicial adequada para usinagem antes do ciclo final de t\u00eampera e revenido ser aplicado internamente. Os di\u00e2metros das barras s\u00e3o definidos para deixar material suficiente para usinagem de acabamento e retifica\u00e7\u00e3o ap\u00f3s o tratamento t\u00e9rmico, e a toler\u00e2ncia dimensional na superf\u00edcie descascada \u00e9 mais importante aqui do que em trabalhos gerais de ferramentas e matrizes, pois afeta a quantidade de material que a oficina de cilindros precisa remover antes do endurecimento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para fornecedores que enviam produtos para a UE, os certificados de ensaio de f\u00e1brica conforme a norma EN 10204 3.1, que abrangem a composi\u00e7\u00e3o qu\u00edmica, a dureza e a condi\u00e7\u00e3o metalogr\u00e1fica, s\u00e3o requisitos padr\u00e3o para esse tipo de pedido, uma vez que os fabricantes de cilindros precisam de documenta\u00e7\u00e3o rastre\u00e1vel antes de submeter o material em barra a um ciclo de t\u00eampera em um cilindro de rolo fino e de alto valor agregado.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1015\" height=\"500\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/07\/IMG_20220112_102015.png\" alt=\"\" class=\"wp-image-16803\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/07\/IMG_20220112_102015.png 1015w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/07\/IMG_20220112_102015-300x148.png 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/07\/IMG_20220112_102015-768x378.png 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/07\/IMG_20220112_102015-18x9.png 18w\" sizes=\"auto, (max-width: 1015px) 100vw, 1015px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A Aobo Steel fornece barras redondas D2 \/ 1.2379 descascadas e recozidas para a produ\u00e7\u00e3o de cilindros de lamina\u00e7\u00e3o a frio, provenientes de parceiros sider\u00fargicos com documenta\u00e7\u00e3o EN 10204 3.1 e entrega CIF dispon\u00edvel para portos europeus. Para quest\u00f5es t\u00e9cnicas sobre sele\u00e7\u00e3o de grau ou especifica\u00e7\u00e3o de barras para Sendzimir e outras aplica\u00e7\u00f5es em laminadores cluster, entre em contato atrav\u00e9s da nossa p\u00e1gina de fornecedores de a\u00e7o ferramenta D2.<\/p>","protected":false},"excerpt":{"rendered":"<p>Why AISI D2 Tool Steel Is the Standard Choice for Sendzimir Cluster Mill Work Rolls Cold rolling mills that use a Sendzimir configuration, commonly called 20-High or Z-Hi cluster mills, are built around one core design decision: the work rolls are made deliberately small in diameter. A smaller work roll lowers the rolling force needed [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[22],"tags":[],"class_list":["post-16800","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Why D2 Is the Standard Choice for Sendzimir Cluster Mill Work Rolls<\/title>\n<meta name=\"description\" content=\"How D2 tool steel chemistry, hardness, and cluster mill geometry combine to solve the wear and brittleness tradeoff in 20-Hi and Z-Hi cold rolling.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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