{"id":2457,"date":"2026-01-24T07:40:32","date_gmt":"2026-01-24T06:40:32","guid":{"rendered":"https:\/\/www.nickelcasting.com\/?p=2457"},"modified":"2026-01-30T03:00:38","modified_gmt":"2026-01-30T02:00:38","slug":"aleacion-20-vs-904l","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/es\/aleacion-20-vs-904l\/","title":{"rendered":"Aleaci\u00f3n 20 vs 904L: Resistencia al \u00e1cido sulf\u00farico"},"content":{"rendered":"

En el \u00e1mbito de los aceros inoxidables austen\u00edticos de alto rendimiento, la elecci\u00f3n entre la Aleaci\u00f3n 20 (UNS N08020) y la 904L (UNS N08904) suele definir la longevidad de los equipos industriales cr\u00edticos. Aunque ambas aleaciones se dise\u00f1aron para cubrir el vac\u00edo existente entre el acero inoxidable 316L est\u00e1ndar y las superaleaciones de alto coste basadas en n\u00edquel, ocupan nichos distintos en cuanto a resistencia a la corrosi\u00f3n, sobre todo en ambientes \u00e1cidos.<\/p>\n

\"\"<\/p>\n

Comparaci\u00f3n entre la aleaci\u00f3n 20 y la 904L: Matices qu\u00edmicos y f\u00edsicos<\/h2>\n

Understanding the Alloy 20 vs 904L comparison begins with their chemical signatures. Alloy 20 is frequently classified as a “super-austenitic” stainless steel or a nickel alloy because of its high nickel content (approx. 35%). This high nickel concentration, combined with copper and molybdenum, provides exceptional resistance to sulfuric acid at various temperatures and concentrations.<\/p>\n

En cambio, el 904L es un acero inoxidable austen\u00edtico de alta aleaci\u00f3n con un contenido de n\u00edquel de aproximadamente 25%. Aunque tambi\u00e9n contiene cobre para mejorar la resistencia a los \u00e1cidos reductores fuertes, se desarroll\u00f3 principalmente para resistir la corrosi\u00f3n por picaduras y grietas en entornos de \u00e1cido sulf\u00farico diluido y \u00e1cido fosf\u00f3rico.<\/p>\n

Tabla de especificaciones t\u00e9cnicas<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Propiedad<\/td>\nAleaci\u00f3n 20 (UNS N08020)<\/td>\n904L (UNS N08904)<\/td>\n<\/tr>\n<\/thead>\n
N\u00edquel (Ni)<\/td>\n32,5% - 35,0%<\/td>\n23.0% - 28.0%<\/td>\n<\/tr>\n
Cromo (Cr)<\/td>\n19.0% - 21.0%<\/td>\n19.0% - 23.0%<\/td>\n<\/tr>\n
Molibdeno (Mo)<\/td>\n2,0% - 3,0%<\/td>\n4,0% - 5,0%<\/td>\n<\/tr>\n
Cobre (Cu)<\/td>\n3,0% - 4,0%<\/td>\n1,0% - 2,0%<\/td>\n<\/tr>\n
Valor PREN<\/td>\n~24 – 26<\/td>\n~34 – 36<\/td>\n<\/tr>\n
L\u00edmite el\u00e1stico<\/td>\n241 MPa (35.000 psi)<\/td>\n31.000 psi (215 MPa)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Aleaci\u00f3n 20 frente a 904L: c\u00f3mo elegir el material adecuado<\/h2>\n

A la hora de decidir Aleaci\u00f3n 20 vs 904L: c\u00f3mo elegir, el factor principal es la naturaleza espec\u00edfica del medio corrosivo.<\/p>\n

    \n
  1. \n

    Concentraci\u00f3n de cloruro frente a concentraci\u00f3n de \u00e1cido: Si su aplicaci\u00f3n implica altas concentraciones de cloruro donde la picadura es la principal preocupaci\u00f3n, 904L es a menudo la mejor opci\u00f3n debido a su mayor contenido de molibdeno y mayor n\u00famero equivalente de resistencia a la picadura (PREN).<\/p>\n<\/li>\n

  2. \n

    Sulfuric Acid Purity: Alloy 20 is the industry standard for “Sulfuric Acid Service.” It excels in 20% to 40% sulfuric acid concentrations where other steels fail. Its niobium (columbium) stabilization also prevents intergranular corrosion during welding.<\/p>\n<\/li>\n

  3. \n

    Rentabilidad: Generalmente, el 904L es m\u00e1s rentable para la manipulaci\u00f3n de productos qu\u00edmicos de uso general, mientras que la aleaci\u00f3n 20 es una inversi\u00f3n especializada para puntos de ebullici\u00f3n de \u00e1cidos agresivos y tuber\u00edas de intercambiadores de calor.<\/p>\n<\/li>\n<\/ol>\n

    \"\"<\/h2>\n

    Aleaci\u00f3n 20 frente a 904L: Estrategias de selecci\u00f3n de plantas qu\u00edmicas<\/h2>\n

    En el contexto de la selecci\u00f3n de aleaci\u00f3n 20 frente a 904L en plantas qu\u00edmicas, los ingenieros deben tener en cuenta el coste total del ciclo de vida. En las plantas de procesamiento qu\u00edmico, la aleaci\u00f3n 20 es el material preferido para tanques de decapado, tanques de mezcla e intercambiadores de calor que trabajan con concentraciones de \u00e1cido sulf\u00farico de hasta 95% a temperaturas elevadas.<\/p>\n

    Conversely, 904L is the go-to for flue-gas desulfurization (FGD) systems, pharmaceutical manufacturing, and paper pulp processing. It provides a robust defense against “warm sea water” and brackish water, making it ideal for coastal chemical facilities where external salt spray adds an extra layer of corrosive stress to the piping.<\/p>\n

    \n

    Preguntas y respuestas relacionadas<\/h3>\n

    P1: \u00bfPuede utilizarse la aleaci\u00f3n 20 en aplicaciones con agua de mar? R1: Aunque la aleaci\u00f3n 20 tiene una resistencia decente, en general se prefiere el 904L para el agua de mar o entornos con alto contenido en cloruros debido a su mayor PREN (34-36), que ofrece una mejor protecci\u00f3n contra las picaduras.<\/p>\n

    Q2: Why is Alloy 20 called “The Carpenter 20” alloy? A2: It was originally developed by Carpenter Technology Corporation. Today, many manufacturers produce it under the UNS N08020 specification, but it remains the benchmark for sulfuric acid resistance.<\/p>\n

    P3: \u00bfQu\u00e9 aleaci\u00f3n es m\u00e1s f\u00e1cil de soldar en una planta qu\u00edmica? A3: Ambas presentan una buena soldabilidad utilizando m\u00e9todos comunes como TIG o MIG. Sin embargo, la estabilizaci\u00f3n con niobio de la aleaci\u00f3n 20 la hace ligeramente m\u00e1s resistente a la precipitaci\u00f3n de carburos en la zona afectada por el calor (ZAC) que la aleaci\u00f3n 904L.<\/p>","protected":false},"excerpt":{"rendered":"

    In the realm of high-performance austenitic stainless steels, the choice between Alloy 20 (UNS N08020) and 904L (UNS N08904) often defines the longevity of critical industrial equipment. While both alloys were engineered to bridge the gap between standard 316L stainless steel and high-cost nickel-based superalloys, they occupy distinct niches in corrosion resistance, particularly in acidic […]<\/p>","protected":false},"author":1,"featured_media":2458,"comment_status":"closed","ping_status":"closed","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":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","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":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"spectra_custom_meta":{"_edit_lock":["1769738438:1"],"_edit_last":["1"],"rank_math_seo_score":["69"],"rank_math_description":["A technical guide comparing Alloy 20 and 904L stainless steels. 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While both alloys were engineered to bridge the gap between standard 316L stainless steel and high-cost nickel-based superalloys, they occupy distinct niches in corrosion resistance, particularly in acidic…","_links":{"self":[{"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/posts\/2457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/comments?post=2457"}],"version-history":[{"count":1,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/posts\/2457\/revisions"}],"predecessor-version":[{"id":2460,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/posts\/2457\/revisions\/2460"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/media\/2458"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/media?parent=2457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/categories?post=2457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/es\/wp-json\/wp\/v2\/tags?post=2457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}