{"id":117152,"date":"2022-09-09T17:32:21","date_gmt":"2022-09-09T16:32:21","guid":{"rendered":"https:\/\/material-properties.org\/aco-inoxidavel-austenitico-densidade-resistencia-dureza-ponto-de-fusao\/"},"modified":"2022-10-17T08:48:08","modified_gmt":"2022-10-17T07:48:08","slug":"aco-inoxidavel-austenitico-densidade-resistencia-dureza-ponto-de-fusao","status":"publish","type":"post","link":"https:\/\/material-properties.org\/pt-br\/aco-inoxidavel-austenitico-densidade-resistencia-dureza-ponto-de-fusao\/","title":{"rendered":"A\u00e7o inoxid\u00e1vel austen\u00edtico &#8211; Densidade &#8211; Resist\u00eancia &#8211; Dureza &#8211; Ponto de fus\u00e3o"},"content":{"rendered":"<h2>Sobre o a\u00e7o inoxid\u00e1vel austen\u00edtico &#8211; Tipo 304<\/h2>\n<p><strong>O a\u00e7o inoxid\u00e1vel tipo 304<\/strong>\u00a0(contendo 18%-20% de cromo e 8%-10,5% de n\u00edquel) \u00e9 o a\u00e7o inoxid\u00e1vel mais comum.\u00a0Tamb\u00e9m \u00e9 conhecido como\u00a0a\u00e7o inoxid\u00e1vel &#8220;<strong>18\/8&#8243; devido \u00e0 sua composi\u00e7\u00e3o, que inclui 18% de cromo e 8% de n\u00edquel. <\/strong>Esta liga resiste \u00e0 maioria dos tipos de corros\u00e3o.\u00a0\u00c9 um a\u00e7o inoxid\u00e1vel austen\u00edtico e tamb\u00e9m possui excelentes propriedades criog\u00eanicas e boa resist\u00eancia a altas temperaturas, bem como boas propriedades de conforma\u00e7\u00e3o e soldagem.\u00a0\u00c9 menos eletricamente e termicamente condutor do que\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/steels-properties-of-steels\/carbon-steel-plain-carbon-steel\/\">o a\u00e7o carbono<\/a>\u00a0e \u00e9 essencialmente n\u00e3o magn\u00e9tico.<\/p>\n<p><strong>O a\u00e7o inoxid\u00e1vel tipo 304L<\/strong>, amplamente utilizado na ind\u00fastria nuclear, \u00e9 uma vers\u00e3o com baixo teor de carbono da liga de a\u00e7o 304.\u00a0Esta classe tem propriedades mec\u00e2nicas um pouco mais baixas do que a classe 304 padr\u00e3o, mas ainda \u00e9 amplamente utilizada gra\u00e7as \u00e0 sua versatilidade.\u00a0O teor de carbono mais baixo em 304L minimiza a precipita\u00e7\u00e3o de carboneto prejudicial ou prejudicial como resultado da soldagem.\u00a0O 304L pode, portanto, ser usado &#8220;como soldado&#8221; em ambientes de corros\u00e3o severa e elimina a necessidade de recozimento.\u00a0O grau 304 tamb\u00e9m tem boa resist\u00eancia \u00e0 oxida\u00e7\u00e3o em servi\u00e7o intermitente at\u00e9 870\u00b0C e em servi\u00e7o cont\u00ednuo at\u00e9 925\u00b0C.<\/p>\n<p>O corpo do\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/reactor-pressure-vessel\/\">vaso do reator<\/a>\u00a0\u00e9 constru\u00eddo\u00a0<strong>em a\u00e7o carbono de baixa liga de alta qualidade<\/strong>\u00a0e todas as superf\u00edcies que entram em contato com o refrigerante do reator\u00a0<strong>s\u00e3o revestidas<\/strong>\u00a0com um m\u00ednimo de cerca de 3 a 10 mm de\u00a0<strong>a\u00e7o inoxid\u00e1vel austen\u00edtico<\/strong>\u00a0para minimizar a corros\u00e3o.\u00a0Como o grau 304L n\u00e3o requer recozimento p\u00f3s-soldagem, \u00e9 amplamente utilizado em componentes de calibre pesado.<\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108251\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price.png\" alt=\"pre\u00e7o de for\u00e7a de densidade de propriedades de a\u00e7o austen\u00edtico\" width=\"500\" height=\"500\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price.png 1000w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price-300x300.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price-150x150.png 150w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/austenitic-steel-properties-density-strength-price-768x768.png 768w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h3 style=\"text-align: center;\">Resumo<\/h3>\n<table class=\"a\">\n<tbody>\n<tr class=\"b\">\n<td style=\"text-align: center;\">Nome<\/td>\n<td style=\"text-align: center;\"><strong>A\u00e7o inoxid\u00e1vel austen\u00edtico<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Fase em STP<\/td>\n<td style=\"text-align: center;\"><strong>s\u00f3lido<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Densidade<\/td>\n<td style=\"text-align: center;\"><strong>7850 kg\/m<sup>3<\/sup><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Resist\u00eancia \u00e0 tra\u00e7\u00e3o<\/td>\n<td style=\"text-align: center;\"><strong>515 MPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">For\u00e7a de rendimento<\/td>\n<td style=\"text-align: center;\"><strong>205 MPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">M\u00f3dulo de elasticidade de Young<\/td>\n<td style=\"text-align: center;\"><strong>193 GPa<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Dureza Brinell<\/td>\n<td style=\"text-align: center;\"><strong>201 BHN<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Ponto de fus\u00e3o<\/td>\n<td style=\"text-align: center;\"><strong>1450 \u00b0C<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Condutividade t\u00e9rmica<\/td>\n<td style=\"text-align: center;\"><strong>20 W\/mK<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Capacidade de calor<\/td>\n<td style=\"text-align: center;\"><strong><span style=\"text-align: start;\">500 J\/gK<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\">Pre\u00e7o<\/td>\n<td style=\"text-align: center;\"><strong>2 $\/kg<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Densidade do a\u00e7o inoxid\u00e1vel austen\u00edtico<\/h2>\n<p class=\"wp-caption-text\">As densidades t\u00edpicas de v\u00e1rias subst\u00e2ncias est\u00e3o \u00e0 press\u00e3o atmosf\u00e9rica.\u00a0<a href=\"https:\/\/material-properties.org\/what-is-density-physics-definition\/\"><strong>A densidade<\/strong><\/a> \u00e9 definida como a <strong>massa por unidade de volume<\/strong>.\u00a0\u00c9 uma <strong>propriedade intensiva<\/strong>, que \u00e9 matematicamente definida como massa dividida pelo volume: <strong>\u03c1 = m\/V<\/strong><\/p>\n<p>Em palavras, a densidade (\u03c1) de uma subst\u00e2ncia \u00e9 a massa total (m) dessa subst\u00e2ncia dividida pelo volume total (V) ocupado por essa subst\u00e2ncia.\u00a0A unidade padr\u00e3o do SI \u00e9 <strong>quilogramas por metro c\u00fabico<\/strong> (<strong>kg\/m<sup>3<\/sup><\/strong>).\u00a0A unidade padr\u00e3o inglesa \u00e9 <strong>libras de massa por p\u00e9 c\u00fabico<\/strong> (<strong>lbm\/ft<sup>3<\/sup><\/strong>).<\/p>\n<p>A densidade do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 de\u00a0<strong>7850 kg\/m<sup>3<\/sup>.<\/strong><\/p>\n<h3>Exemplo: Densidade<\/h3>\n<p>Calcule a altura de um cubo feito de a\u00e7o inoxid\u00e1vel austen\u00edtico, que pesa uma tonelada m\u00e9trica.<\/p>\n<p><strong>Solu\u00e7\u00e3o:<\/strong><\/p>\n<p><strong>A densidade<\/strong> \u00e9 definida como a <strong>massa por unidade de volume<\/strong>.\u00a0\u00c9 matematicamente definido como massa dividida pelo volume:\u00a0<strong>\u03c1 = m\/V<\/strong><\/p>\n<p>Como o volume de um cubo \u00e9 a terceira pot\u00eancia de seus lados (V = a<sup>3<\/sup>), a altura desse cubo pode ser calculada:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-109279 size-full\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\" alt=\"densidade do material - equa\u00e7\u00e3o\" width=\"281\" height=\"125\" \/><\/a><\/p>\n<p>A altura desse cubo \u00e9 ent\u00e3o\u00a0<strong>a = 0,503 m<\/strong>.<\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Densidade de Materiais<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-108113 size-medium aligncenter\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png\" alt=\"Tabela de Materiais - Densidade de Materiais\" width=\"300\" height=\"179\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-1024x610.png 1024w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-768x458.png 768w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density.png 1368w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Propriedades Mec\u00e2nicas do A\u00e7o Inoxid\u00e1vel Austen\u00edtico<\/h2>\n<h3>Resist\u00eancia do a\u00e7o inoxid\u00e1vel austen\u00edtico<\/h3>\n<p>Na mec\u00e2nica dos materiais, a\u00a0<strong>resist\u00eancia de um material<\/strong>\u00a0\u00e9 sua capacidade de suportar uma carga aplicada sem falha ou deforma\u00e7\u00e3o pl\u00e1stica.\u00a0<strong>A resist\u00eancia dos materiais<\/strong>\u00a0considera basicamente a rela\u00e7\u00e3o entre as\u00a0<strong>cargas externas<\/strong>\u00a0aplicadas a um material e a\u00a0<strong>deforma\u00e7\u00e3o<\/strong>\u00a0resultante ou altera\u00e7\u00e3o nas dimens\u00f5es do material.\u00a0Ao projetar estruturas e m\u00e1quinas, \u00e9 importante considerar esses fatores, para que o material selecionado tenha resist\u00eancia adequada para resistir \u00e0s cargas ou for\u00e7as aplicadas e manter sua forma original.<\/p>\n<p><strong>A resist\u00eancia de um material<\/strong>\u00a0\u00e9 a sua capacidade de suportar esta carga aplicada sem falha ou deforma\u00e7\u00e3o pl\u00e1stica.\u00a0Para tens\u00e3o de tra\u00e7\u00e3o, a capacidade de um material ou estrutura de suportar cargas que tendem a se alongar \u00e9 conhecida como resist\u00eancia \u00e0 tra\u00e7\u00e3o final (UTS).\u00a0<a href=\"https:\/\/material-properties.org\/what-is-yield-strength-yield-point-definition\/\">O limite de escoamento<\/a>\u00a0ou tens\u00e3o de escoamento \u00e9 a propriedade do material definida como a tens\u00e3o na qual um material come\u00e7a a se deformar plasticamente, enquanto o ponto de escoamento \u00e9 o ponto onde a deforma\u00e7\u00e3o n\u00e3o linear (el\u00e1stica + pl\u00e1stica) come\u00e7a.\u00a0No caso de tens\u00e3o de tra\u00e7\u00e3o de uma barra uniforme (curva tens\u00e3o-deforma\u00e7\u00e3o), a <a href=\"https:\/\/material-properties.org\/what-is-hookes-law-definition\/\"><b>lei de Hooke<\/b><\/a>\u00a0descreve o comportamento de uma barra na regi\u00e3o el\u00e1stica.\u00a0O\u00a0<a href=\"https:\/\/material-properties.org\/what-is-youngs-modulus-of-elasticity-definition\/\">m\u00f3dulo de elasticidade de Young<\/a>\u00a0\u00e9 o m\u00f3dulo de elasticidade para tens\u00f5es de tra\u00e7\u00e3o e compress\u00e3o no regime de elasticidade linear de uma deforma\u00e7\u00e3o uniaxial e geralmente \u00e9 avaliado por ensaios de tra\u00e7\u00e3o.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/material-properties.org\/what-is-strength-definition\/\">Resist\u00eancia dos Materiais<\/a><\/p>\n<h3>Resist\u00eancia \u00e0 tra\u00e7\u00e3o final do a\u00e7o inoxid\u00e1vel austen\u00edtico<\/h3>\n<p>A resist\u00eancia \u00e0 tra\u00e7\u00e3o final do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 de 280 MPa.<\/p>\n<h3>Resist\u00eancia ao escoamento do a\u00e7o inoxid\u00e1vel austen\u00edtico<\/h3>\n<p>O limite de escoamento do a\u00e7o inoxid\u00e1vel austen\u00edtico\u00a0<strong>\u00a0<\/strong>\u00e9 de 145 MPa.<\/p>\n<h3>M\u00f3dulo de Elasticidade do A\u00e7o Inoxid\u00e1vel Austen\u00edtico<\/h3>\n<p>O m\u00f3dulo de elasticidade de Young do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 de 45 GPa.<\/p>\n<h3>Dureza do a\u00e7o inoxid\u00e1vel austen\u00edtico<\/h3>\n<p>Na ci\u00eancia dos materiais, a <a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/hardness\/\"><strong>dureza<\/strong><\/a> \u00e9 a capacidade de suportar\u00a0\u00a0<strong>o recuo da superf\u00edcie<\/strong> (<strong>deforma\u00e7\u00e3o pl\u00e1stica localizada<\/strong>) e <strong>arranh\u00f5es<\/strong>.\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/hardness\/brinell-hardness-test\/\"><strong>O teste de dureza Brinell<\/strong><\/a> \u00e9 um dos testes de dureza de indenta\u00e7\u00e3o, que foi desenvolvido para testes de dureza.\u00a0Nos testes Brinell, um\u00a0\u00a0<strong>penetrador esf\u00e9rico<\/strong>\u00a0duro \u00e9 for\u00e7ado sob uma carga espec\u00edfica na superf\u00edcie do metal a ser testado.<\/p>\n<p>O <strong>n\u00famero de dureza Brinell<\/strong> (HB) \u00e9 a carga dividida pela \u00e1rea da superf\u00edcie da indenta\u00e7\u00e3o.\u00a0O di\u00e2metro da impress\u00e3o \u00e9 medido com um microsc\u00f3pio com uma escala sobreposta.\u00a0O n\u00famero de dureza Brinell \u00e9 calculado a partir da equa\u00e7\u00e3o:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-90677\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition.png\" sizes=\"(max-width: 320px) 100vw, 320px\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition.png 320w, https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition-300x178.png 300w\" alt=\"n\u00famero de dureza brinell - defini\u00e7\u00e3o\" width=\"320\" height=\"190\" \/><\/a><\/p>\n<p>A dureza Brinell do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 de aproximadamente 70 BHN (convertido).<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/material-properties.org\/what-is-hardness-definition\/\">Dureza dos Materiais<\/a><\/p>\n<h3>Exemplo: For\u00e7a<\/h3>\n<p>Suponha uma haste de pl\u00e1stico, que \u00e9 feita de a\u00e7o inoxid\u00e1vel austen\u00edtico.\u00a0Esta haste de pl\u00e1stico tem uma \u00e1rea de se\u00e7\u00e3o transversal de 1 cm<sup>2<\/sup>.\u00a0Calcule a for\u00e7a de tra\u00e7\u00e3o necess\u00e1ria para atingir a resist\u00eancia \u00e0 tra\u00e7\u00e3o final para este material, que \u00e9: UTS = 280 MPa.<\/p>\n<p>Solu\u00e7\u00e3o:<\/p>\n<p><strong>A tens\u00e3o (\u03c3)<\/strong> pode ser igualada \u00e0 carga por unidade de \u00e1rea ou \u00e0 for\u00e7a (F) aplicada por \u00e1rea de se\u00e7\u00e3o transversal (A) perpendicular \u00e0 for\u00e7a como:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-109284 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation-300x184.png\" alt=\"resist\u00eancia do material - equa\u00e7\u00e3o\" width=\"300\" height=\"184\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation-300x184.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/strength-of-material-equation.png 380w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>portanto, a for\u00e7a de tra\u00e7\u00e3o necess\u00e1ria para atingir a resist\u00eancia \u00e0 tra\u00e7\u00e3o final \u00e9:<\/p>\n<p><strong>F<\/strong> = UTS x A = 280 x 10<sup>6<\/sup>\u00a0x 0,0001 =\u00a0<strong>28000 N<\/strong><\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Resist\u00eancia dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/strength-of-materials-tensile-yield\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108070 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Strength-of-Materials-300x182.png\" alt=\"Tabela de Materiais - Resist\u00eancia dos Materiais\" width=\"300\" height=\"182\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Elasticidade dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/elasticity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108080 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Elasticity-of-Materials-300x185.png\" alt=\"Tabela de Materiais - Elasticidade dos Materiais\" width=\"300\" height=\"185\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Dureza dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/hardness-of-materials-brinell-mohs\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108085 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Hardness-of-Materials-300x182.png\" alt=\"Tabela de Materiais - Dureza dos Materiais\" width=\"300\" height=\"182\" \/><\/a>\u00a0 <\/p><\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<h2>Propriedades T\u00e9rmicas do A\u00e7o Inoxid\u00e1vel Austen\u00edtico<\/h2>\n<h3>A\u00e7o Inoxid\u00e1vel Austen\u00edtico &#8211; Ponto de Fus\u00e3o<\/h3>\n<p><strong>O ponto de fus\u00e3o do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 550-640\u00a0<\/strong><strong>\u00b0C<\/strong>.<\/p>\n<p>Observe que esses pontos est\u00e3o associados \u00e0 press\u00e3o atmosf\u00e9rica padr\u00e3o.\u00a0Em geral, a <strong>fus\u00e3o<\/strong> \u00e9 uma\u00a0<strong>mudan\u00e7a de fase<\/strong> de uma subst\u00e2ncia da fase s\u00f3lida para a l\u00edquida.\u00a0O <strong>ponto de fus\u00e3o<\/strong>\u00a0de uma subst\u00e2ncia \u00e9 a temperatura na qual essa mudan\u00e7a de fase ocorre.\u00a0O <strong>ponto de fus\u00e3o <\/strong>tamb\u00e9m define uma condi\u00e7\u00e3o na qual o s\u00f3lido e o l\u00edquido podem existir em equil\u00edbrio.\u00a0Para v\u00e1rios compostos qu\u00edmicos e ligas, \u00e9 dif\u00edcil definir o ponto de fus\u00e3o, pois geralmente s\u00e3o uma mistura de v\u00e1rios elementos qu\u00edmicos.<\/p>\n<h3>A\u00e7o Inoxid\u00e1vel Austen\u00edtico &#8211; Condutividade T\u00e9rmica<\/h3>\n<p>A condutividade t\u00e9rmica do a\u00e7o inoxid\u00e1vel austen\u00edtico \u00e9 de\u00a0<strong>116\u00a0<\/strong><strong>W\/(m\u00b7K)<\/strong>.<\/p>\n<p>As caracter\u00edsticas de transfer\u00eancia de calor de um material s\u00f3lido s\u00e3o medidas por uma propriedade chamada <strong>condutividade t\u00e9rmica<\/strong>, k (ou \u03bb), medida em <strong>W\/mK<\/strong>.\u00a0\u00c9 uma medida da capacidade de uma subst\u00e2ncia de transferir calor atrav\u00e9s de um material por <a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conduction-heat-conduction-definition\/\">condu\u00e7\u00e3o<\/a>.\u00a0Observe que <a href=\"https:\/\/www.thermal-engineering.org\/what-is-fouriers-law-of-thermal-conduction-definition\/\"><strong>a lei de Fourier<\/strong><\/a> se aplica a toda mat\u00e9ria, independentemente de seu estado (s\u00f3lido, l\u00edquido ou gasoso), portanto, tamb\u00e9m \u00e9 definida para l\u00edquidos e gases.<\/p>\n<p>A <a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\"><strong>condutividade t\u00e9rmica<\/strong><\/a> da maioria dos l\u00edquidos e s\u00f3lidos varia com a temperatura.\u00a0Para vapores, tamb\u00e9m depende da press\u00e3o.\u00a0No geral:<\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-88793\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\" alt=\"condutividade t\u00e9rmica - defini\u00e7\u00e3o\" width=\"225\" height=\"75\" \/><\/a><\/p>\n<p>A maioria dos materiais s\u00e3o quase homog\u00eaneos, portanto, geralmente podemos escrever <strong><em>k = k (T)<\/em><\/strong>.\u00a0Defini\u00e7\u00f5es semelhantes est\u00e3o associadas a condutividades t\u00e9rmicas nas dire\u00e7\u00f5es y e z (ky, kz), mas para um material isotr\u00f3pico a condutividade t\u00e9rmica \u00e9 independente da dire\u00e7\u00e3o de transfer\u00eancia, kx = ky = kz = k.<\/p>\n<h3>A\u00e7o Inoxid\u00e1vel Austen\u00edtico &#8211; Calor Espec\u00edfico<\/h3>\n<p><strong>O calor espec\u00edfico do a\u00e7o inoxid\u00e1vel austen\u00edtico\u00a0<\/strong><strong>\u00e9 900 J\/gK.<\/strong><\/p>\n<p><strong>Calor espec\u00edfico, ou capacidade calor\u00edfica espec\u00edfica, <\/strong>\u00e9 uma propriedade relacionada \u00e0\u00a0<strong><a href=\"https:\/\/www.thermal-engineering.org\/what-is-internal-energy-thermal-energy-definition\/\">energia interna<\/a><\/strong> que \u00e9 muito importante na termodin\u00e2mica.\u00a0As <strong>propriedades intensivas <\/strong><strong><em>c<\/em><\/strong><strong><em><sub>v<\/sub><\/em><\/strong> e\u00a0<strong><em>c<\/em><\/strong><strong><em><sub>p<\/sub><\/em><\/strong> s\u00e3o definidas para subst\u00e2ncias compress\u00edveis puras simples como derivadas parciais da <strong>energia interna <\/strong><strong><em>u(T, v)<\/em><\/strong> \u00a0e\u00a0<strong>entalpia\u00a0\u00a0<\/strong><strong><em>h(T, p)<\/em><\/strong>, respectivamente:<strong>\u00a0<\/strong><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-87689\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\" alt=\"\" width=\"106\" height=\"138\" \/><\/a><\/p>\n<p>onde os subscritos <strong>v<\/strong> e\u00a0<strong>p<\/strong> denotam as vari\u00e1veis \u200b\u200bmantidas fixas durante a diferencia\u00e7\u00e3o.\u00a0As propriedades\u00a0<strong>c<sub>v<\/sub> <\/strong>e\u00a0<strong>c<sub>p<\/sub><\/strong> s\u00e3o chamadas de <strong>calores espec\u00edficos<\/strong>\u00a0(ou\u00a0<strong>capacidades t\u00e9rmicas<\/strong>) porque, sob certas condi\u00e7\u00f5es especiais, elas relacionam a mudan\u00e7a de temperatura de um sistema com a quantidade de energia adicionada pela transfer\u00eancia de calor.\u00a0Suas unidades no SI s\u00e3o\u00a0<strong>J\/kg K<\/strong> ou <strong>J\/mol K<\/strong>.<\/p>\n<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Ponto de fus\u00e3o dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/melting-point-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108050 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Metling-Point-300x183.png\" alt=\"Tabela de Materiais - Ponto de Fus\u00e3o\" width=\"300\" height=\"183\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Condutividade T\u00e9rmica dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/thermal-conductivity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108055 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Thermal-Conductivity-300x180.png\" alt=\"Tabela de Materiais - Condutividade T\u00e9rmica\" width=\"300\" height=\"180\" \/><\/a><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\">Capacidade de Calor dos Materiais<\/h3>\n<p><a href=\"https:\/\/material-properties.org\/heat-capacity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108063 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Heat-Capacity-300x179.png\" alt=\"Tabela de Materiais - Capacidade de Calor\" width=\"300\" height=\"179\" \/><\/a><\/p>\n<h3 style=\"text-align: center;\"><\/h3>\n<\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sobre o a\u00e7o inoxid\u00e1vel austen\u00edtico &#8211; Tipo 304 O a\u00e7o inoxid\u00e1vel tipo 304\u00a0(contendo 18%-20% de cromo e 8%-10,5% de n\u00edquel) \u00e9 o a\u00e7o inoxid\u00e1vel mais comum.\u00a0Tamb\u00e9m \u00e9 conhecido como\u00a0a\u00e7o inoxid\u00e1vel &#8220;18\/8&#8243; devido \u00e0 sua composi\u00e7\u00e3o, que inclui 18% de cromo e 8% de n\u00edquel. 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