{"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":"alloy-20-vs-904l","status":"publish","type":"post","link":"https:\/\/www.nickelcasting.com\/ko\/alloy-20-vs-904l\/","title":{"rendered":"\ud569\uae08 20 \ub300 904L: \ud669\uc0b0 \ub0b4\uc131"},"content":{"rendered":"

\uace0\uc131\ub2a5 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8 \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15 \uc601\uc5ed\uc5d0\uc11c\ub294 Alloy 20(UNS N08020)\uacfc 904L(UNS N08904) \uc911 \uc5b4\ub290 \uac83\uc744 \uc120\ud0dd\ud558\ub290\ub0d0\uc5d0 \ub530\ub77c \uc911\uc694 \uc0b0\uc5c5 \uc7a5\ube44\uc758 \uc218\uba85\uc774 \uacb0\uc815\ub418\ub294 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4. \ub450 \ud569\uae08 \ubaa8\ub450 \ud45c\uc900 316L \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uacfc \uace0\uac00\uc758 \ub2c8\ucf08 \uae30\ubc18 \ucd08\ud569\uae08 \uc0ac\uc774\uc758 \uac04\uadf9\uc744 \uba54\uc6b0\uae30 \uc704\ud574 \uc124\uacc4\ub418\uc5c8\uc9c0\ub9cc, \ud2b9\ud788 \uc0b0\uc131 \ud658\uacbd\uc5d0\uc11c\ub294 \ub0b4\uc2dd\uc131\uc5d0\uc11c \ub69c\ub837\ud55c \ud2c8\uc0c8\ub97c \ucc28\uc9c0\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\"\"<\/p>\n

\ud569\uae08 20\uacfc 904L \ube44\uad50: \ud654\ud559\uc801 \ubc0f \ubb3c\ub9ac\uc801 \ub258\uc559\uc2a4<\/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

\ubc18\uba74 904L\uc740 \ub2c8\ucf08 \ud568\ub7c9\uc774 \uc57d 25%\uc778 \uace0\ud569\uae08 \uc624\uc2a4\ud14c\ub098\uc774\ud2b8 \uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15\uc785\ub2c8\ub2e4. \ub610\ud55c \uad6c\ub9ac\ub97c \ud568\uc720\ud558\uc5ec \uac15\ud55c \ud658\uc6d0\uc0b0\uc5d0 \ub300\ud55c \ub0b4\uc131\uc744 \uac15\ud654\ud558\uc9c0\ub9cc, \uc8fc\ub85c \ubb3d\uc740 \ud669\uc0b0 \ubc0f \uc778\uc0b0 \ud658\uacbd\uc5d0\uc11c \ud53c\ud305 \ubc0f \ud2c8\uc0c8 \ubd80\uc2dd\uc5d0 \uc800\ud56d\ud558\uae30 \uc704\ud574 \uac1c\ubc1c\ub418\uc5c8\uc2b5\ub2c8\ub2e4.<\/p>\n

\uae30\uc220 \uc0ac\uc591 \ud45c<\/h3>\n\n\n\n\n\n\n\n\n\n\n
\uc18d\uc131<\/td>\n\ud569\uae08 20(UNS N08020)<\/td>\n904L(UNS N08904)<\/td>\n<\/tr>\n<\/thead>\n
\ub2c8\ucf08(Ni)<\/td>\n32.5% - 35.0%<\/td>\n23.0% - 28.0%<\/td>\n<\/tr>\n
\ud06c\ub86c(Cr)<\/td>\n19.01T3PT - 21.01T3PT<\/td>\n19.0% - 23.0%<\/td>\n<\/tr>\n
\ubab0\ub9ac\ube0c\ub374(Mo)<\/td>\n2.0% - 3.0%<\/td>\n4.01T3PT - 5.01T3PT<\/td>\n<\/tr>\n
\uad6c\ub9ac(Cu)<\/td>\n3.0% - 4.0%<\/td>\n1.0% - 2.0%<\/td>\n<\/tr>\n
PREN \uac12<\/td>\n~24 – 26<\/td>\n~34 – 36<\/td>\n<\/tr>\n
\uc218\uc728 \uac15\ub3c4<\/td>\n35,000psi(241MPa)<\/td>\n31,000psi(215MPa)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\ud569\uae08 20 \ub300 904L: \uc62c\ubc14\ub978 \uc18c\uc7ac\ub97c \uc120\ud0dd\ud558\ub294 \ubc29\ubc95<\/h2>\n

Alloy 20\uacfc 904L \uc911 \uc5b4\ub5a4 \uac83\uc744 \uc120\ud0dd\ud560\uc9c0 \uacb0\uc815\ud560 \ub54c \uac00\uc7a5 \uc911\uc694\ud55c \uc694\uc18c\ub294 \ubd80\uc2dd\uc131 \ub9e4\uccb4\uc758 \ud2b9\uc815 \ud2b9\uc131\uc785\ub2c8\ub2e4.<\/p>\n

    \n
  1. \n

    \uc5fc\ud654\ubb3c \ub300 \uc0b0 \ub18d\ub3c4: \ud53c\ud305\uc774 \uc8fc\uc694 \uad00\uc2ec\uc0ac\uc778 \ub192\uc740 \uc5fc\ud654\ubb3c \ub18d\ub3c4\ub97c \ud3ec\ud568\ud558\ub294 \uc751\uc6a9 \ubd84\uc57c\uc5d0\uc11c\ub294 \ubab0\ub9ac\ube0c\ub374 \ud568\ub7c9\uc774 \ub192\uace0 \ud53c\ud305 \uc800\ud56d \ub4f1\uac00 \uc218(PREN)\uac00 \ub192\uc740 904L\uc774 \ub354 \uc6b0\uc218\ud55c \uc120\ud0dd\uc778 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4.<\/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

    \ube44\uc6a9 \ud6a8\uc728\uc131: \uc77c\ubc18\uc801\uc73c\ub85c 904L\uc740 \ubc94\uc6a9 \ud654\ud559 \ubb3c\uc9c8 \ucde8\uae09\uc5d0 \ub354 \ube44\uc6a9 \ud6a8\uc728\uc801\uc774\uba70, Alloy 20\uc740 \uacf5\uaca9\uc801\uc778 \uc0b0\uc131 \ube44\uc810 \ubc0f \uc5f4\uad50\ud658\uae30 \ud29c\ube0c\uc5d0 \ud2b9\ud654\ub41c \ud22c\uc790 \uc81c\ud488\uc785\ub2c8\ub2e4.<\/p>\n<\/li>\n<\/ol>\n

    \"\"<\/h2>\n

    \ud569\uae08 20 \ub300 904L: \ud654\ud559 \ud50c\ub79c\ud2b8 \uc120\ud0dd \uc804\ub7b5<\/h2>\n

    \ud654\ud559 \ud50c\ub79c\ud2b8\uc5d0\uc11c Alloy 20\uacfc 904L\uc744 \uc120\ud0dd\ud560 \ub54c \uc5d4\uc9c0\ub2c8\uc5b4\ub294 \ucd1d \uc218\uba85 \uc8fc\uae30 \ube44\uc6a9\uc744 \uace0\ub824\ud574\uc57c \ud569\ub2c8\ub2e4. \ud654\ud559 \ucc98\ub9ac \ud50c\ub79c\ud2b8\uc5d0\uc11c\ub294 \uace0\uc628\uc5d0\uc11c \ucd5c\ub300 95%\uc758 \ud669\uc0b0 \ub18d\ub3c4\ub97c \ucc98\ub9ac\ud558\ub294 \uc0b0\uc138 \ud0f1\ud06c, \ud63c\ud569 \ud0f1\ud06c \ubc0f \uc5f4\uad50\ud658\uae30\uc5d0 Alloy 20\uc774 \uc120\ud638\ub418\ub294 \uc18c\uc7ac\uc785\ub2c8\ub2e4.<\/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

    \uad00\ub828 Q&A<\/h3>\n

    Q1: \ud569\uae08 20\uc744 \ubc14\ub2f7\ubb3c \uc6a9\ub3c4\uc5d0 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub098\uc694? A1: Alloy 20\uc758 \uc800\ud56d\uc131\uc740 \uad1c\ucc2e\uc9c0\ub9cc, \uc77c\ubc18\uc801\uc73c\ub85c \ubc14\ub2f7\ubb3c\uc774\ub098 \uc5fc\ud654\ubb3c\uc774 \ub9ce\uc740 \ud658\uacbd\uc5d0\uc11c\ub294 904L\uc774 \ub354 \ub192\uc740 PREN(34-36)\uc73c\ub85c \uc778\ud574 \ud53c\ud305\uc5d0 \ub300\ud55c \ubcf4\ud638 \uae30\ub2a5\uc774 \ub354 \ub6f0\uc5b4\ub098\uae30 \ub54c\ubb38\uc5d0 \uc120\ud638\ub429\ub2c8\ub2e4.<\/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

    Q3: \ud654\ud559 \ud50c\ub79c\ud2b8 \ud658\uacbd\uc5d0\uc11c \uc5b4\ub5a4 \ud569\uae08\uc774 \uc6a9\uc811\ud558\uae30 \ub354 \uc26c\uc6b4\uac00\uc694? A3: \ub458 \ub2e4 TIG \ub610\ub294 MIG\uc640 \uac19\uc740 \uc77c\ubc18\uc801\uc778 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc6b0\uc218\ud55c \uc6a9\uc811\uc131\uc744 \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \ud558\uc9c0\ub9cc \ud569\uae08 20\uc758 \ub2c8\uc624\ube00 \uc548\uc815\ud654 \ub355\ubd84\uc5d0 904L\uc5d0 \ube44\ud574 \uc5f4 \uc601\ud5a5 \uad6c\uc5ed(HAZ)\uc5d0\uc11c\uc758 \uce74\ubc14\uc774\ub4dc \uce68\uc804\uc5d0 \ub300\ud55c \uc800\ud56d\uc131\uc774 \uc57d\uac04 \ub354 \ub192\uc2b5\ub2c8\ub2e4.<\/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\/ko\/wp-json\/wp\/v2\/posts\/2457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/comments?post=2457"}],"version-history":[{"count":1,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/posts\/2457\/revisions"}],"predecessor-version":[{"id":2460,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/posts\/2457\/revisions\/2460"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/media\/2458"}],"wp:attachment":[{"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/media?parent=2457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/categories?post=2457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nickelcasting.com\/ko\/wp-json\/wp\/v2\/tags?post=2457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}