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href="/wiki/File:ESR1_uddeholm.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/ESR1_uddeholm.jpg/260px-ESR1_uddeholm.jpg" decoding="async" width="260" height="199" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/21/ESR1_uddeholm.jpg/390px-ESR1_uddeholm.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/21/ESR1_uddeholm.jpg/520px-ESR1_uddeholm.jpg 2x" data-file-width="1575" data-file-height="1208" /></a><figcaption>Rendering of electro-slag remelting apparatus and cross-sections</figcaption></figure> <p><b>Electroslag remelting</b> (<b>ESR</b>), also known as <b>electro-flux remelting</b>, is a process of remelting and <a href="/wiki/Refining" title="Refining">refining</a> <a href="/wiki/Steel" title="Steel">steel</a> and other <a href="/wiki/Alloy" title="Alloy">alloys</a> for <a href="/wiki/Mission-critical" class="mw-redirect" title="Mission-critical">mission-critical</a> applications in <a href="/wiki/Aircraft" title="Aircraft">aircraft</a>, <a href="/wiki/Thermal_power_station" title="Thermal power station">thermal power stations</a>, <a href="/wiki/Nuclear_power_plant" title="Nuclear power plant">nuclear power plants</a>, <a href="/wiki/Military_technology" title="Military technology">military technology</a> and others.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>The electroslag remelting (ESR) process is used to remelt and refine steels and various super-alloys, resulting in high-quality ingots. This process can be started up through <a href="/wiki/Vacuum_induction_melting" title="Vacuum induction melting">vacuum induction melting</a>. The ESR process uses the as-cast alloy as a consumable electrode. Electric current (generally AC) is passed between the electrode and the new ingot, which is formed in the bottom of a water-cooled copper mold. The new ingot is covered in an engineered slag that is superheated by the electric current. The electrode tip is slowly melted from contact with the slag. These metal droplets travel through the slag to the bottom of the water-cooled mold and slowly freeze as the ingot is directionally solidified upwards from the bottom of the mold. The slag pool floats above the refined alloy, continuously floating upwards as the alloy solidifies. The molten metal is cleaned of impurities that chemically react with the slag or otherwise float to the top of the molten pool as the molten droplets pass through the slag.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Electroslag remelting uses highly reactive slags (<a href="/wiki/Calcium_fluoride" title="Calcium fluoride">calcium fluoride</a>, lime, alumina, or other oxides are usually the main components) to reduce the amount of type-A <a href="/wiki/Sulfide" title="Sulfide">sulfide</a> present in <a href="/wiki/Biometal_(biology)" title="Biometal (biology)">biometal</a> alloys. It is a common practice in European industries. ESR reduces other types of <a href="/wiki/Casting_defect#Pouring_metal_defects" title="Casting defect">inclusions</a> as well, and is seen as an alternative to the <a href="/wiki/Vacuum_arc_remelting" title="Vacuum arc remelting">vacuum arc remelting</a> (VAR) method that is prevalent in US industries. </p><p>An example of the use of the electro-slag refined (ESR) steel technique is the <a href="/wiki/Royal_Ordnance_L30" title="Royal Ordnance L30">L30</a> <a href="/wiki/Tank_gun" title="Tank gun">tank gun</a>. </p><p><a href="/w/index.php?title=CrNi60WTi&action=edit&redlink=1" class="new" title="CrNi60WTi (page does not exist)">CrNi60WTi</a> is a <a href="/wiki/Stainless_steel" title="Stainless steel">stainless steel</a> which is best formed by either electro-slag remelting or vacuum arc remelting. This alloy can be used for the construction of <a href="/wiki/Nuclear_power_plants" class="mw-redirect" title="Nuclear power plants">nuclear power plants</a>.<sup id="cite_ref-cnoj_3-0" class="reference"><a href="#cite_note-cnoj-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Electro-slag_remelting&action=edit&section=1" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Vacuum_induction_melting" title="Vacuum induction melting">Vacuum induction melting</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Electro-slag_remelting&action=edit&section=2" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFRoger_C._Reed2006" class="citation cs2">Roger C. Reed (2006), <a rel="nofollow" class="external text" href="https://books.google.com/books?id=SIUGcd4a-EkC&q=%22Electro+Slag+Remelting%22&pg=PA227"><i>The Superalloys: Fundamentals and Applications</i></a>, Cambridge University Press, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-85904-2" title="Special:BookSources/978-0-521-85904-2"><bdi>978-0-521-85904-2</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Superalloys%3A+Fundamentals+and+Applications&rft.pub=Cambridge+University+Press&rft.date=2006&rft.isbn=978-0-521-85904-2&rft.au=Roger+C.+Reed&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DSIUGcd4a-EkC%26q%3D%2522Electro%2BSlag%2BRemelting%2522%26pg%3DPA227&rfr_id=info%3Asid%2Fen.wikipedia.org%3AElectro-slag+remelting" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20130408130634/http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA017796">Article title</a></span> </li> <li id="cite_note-cnoj-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-cnoj_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJalilov2019" class="citation news cs1">Jalilov, Orkhan (November 5, 2019). <a rel="nofollow" class="external text" href="https://caspiannews.com/news-detail/us-imposes-sanctions-on-irans-construction-sphere-2019-11-1-52/">"US Imposes Sanctions On Iran's Construction Sphere"</a>. Caspian News.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=US+Imposes+Sanctions+On+Iran%27s+Construction+Sphere&rft.date=2019-11-05&rft.aulast=Jalilov&rft.aufirst=Orkhan&rft_id=https%3A%2F%2Fcaspiannews.com%2Fnews-detail%2Fus-imposes-sanctions-on-irans-construction-sphere-2019-11-1-52%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AElectro-slag+remelting" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Electro-slag_remelting&action=edit&section=3" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.moldmakingtechnology.com/articles/030304.html">Ensuring Mold Steel Polishability</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20070911003413/http://www.moldmakingtechnology.com/articles/030304.html">Archived</a> 2007-09-11 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> at moldmakingtechnology.com</li> <li><a rel="nofollow" class="external text" href="http://www.freepatentsonline.com/4394765.html">Electro-slag remelting furnace for consumable electrodes and having an electrode drive United States Patent 4394765</a> at freepatentsonline.com</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output 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style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Smelting" title="Smelting">Smelting</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bloomery" title="Bloomery">Bloomery</a> (produces <a href="/wiki/Direct_reduced_iron" title="Direct reduced iron">sponge iron</a>)</li> <li><a href="/wiki/Blast_furnace" title="Blast furnace">Blast furnace</a> (produces <a href="/wiki/Pig_iron" title="Pig iron">pig iron</a>) <ul><li><a href="/wiki/Cold_blast" title="Cold blast">Cold blast</a></li> <li><a href="/wiki/Hot_blast" title="Hot blast">Hot blast</a></li> <li><a href="/wiki/Anthracite_iron" title="Anthracite iron">Anthracite iron</a></li></ul></li> <li><a href="/wiki/Direct_reduced_iron" title="Direct reduced iron">Direct reduced iron</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Secondary</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Wrought_iron" title="Wrought iron">Wrought iron</a> (via <a href="/wiki/Finery_forge" title="Finery forge">Finery forge</a> or <a href="/wiki/Reverberatory_furnace" title="Reverberatory furnace">Reverberatory</a> <a href="/wiki/Puddling_(metallurgy)" title="Puddling (metallurgy)">Puddling</a> <a href="/wiki/Industrial_furnace" title="Industrial furnace">Furnace</a>)</li> <li><a href="/wiki/Cast_iron" title="Cast iron">Cast iron</a> (via <a href="/wiki/Cupola_furnace" title="Cupola furnace">Cupola furnace</a> or <a href="/wiki/Induction_furnace" title="Induction furnace">Induction furnace</a>)</li></ul> </div></td></tr></tbody></table><div></div></td><td class="noviewer navbox-image" rowspan="4" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Fotothek_df_n-08_0000320.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Fotothek_df_n-08_0000320.jpg/120px-Fotothek_df_n-08_0000320.jpg" decoding="async" width="120" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Fotothek_df_n-08_0000320.jpg/180px-Fotothek_df_n-08_0000320.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Fotothek_df_n-08_0000320.jpg/240px-Fotothek_df_n-08_0000320.jpg 2x" data-file-width="779" data-file-height="778" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Steelmaking" title="Steelmaking">Steelmaking</a><br />(<a href="/wiki/Steel_mill" title="Steel mill">Steel mill</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Primary (Pre-1850)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pattern_welding" title="Pattern welding">Pattern welding</a></li> <li><a href="/wiki/Crucible_steel" title="Crucible steel">Crucible steel</a> (<a href="/wiki/Damascus_steel" title="Damascus steel">Damascus steel</a>, <a href="/wiki/Wootz_steel" title="Wootz steel">Wootz steel</a>)</li> <li><a href="/wiki/Tatara_(furnace)" title="Tatara (furnace)">Tatara furnace</a></li> <li><a href="/wiki/Cementation_process" title="Cementation process">Cementation process</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Primary (Post-1850)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bessemer_process" title="Bessemer process">Bessemer process</a></li> <li><a href="/wiki/Open_hearth_furnace" class="mw-redirect" title="Open hearth furnace">Open hearth furnace</a></li> <li><a href="/wiki/Electric_arc_furnace" title="Electric arc furnace">Electric arc furnace</a></li> <li><a href="/wiki/Basic_oxygen_steelmaking" title="Basic oxygen steelmaking">Basic oxygen process</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Secondary</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Electro-slag remelting</a></li> <li><a href="/wiki/Vacuum_arc_remelting" title="Vacuum arc remelting">Vacuum arc remelting</a></li> <li><a href="/wiki/Argon_oxygen_decarburization" title="Argon oxygen decarburization">Argon oxygen decarburization</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Heat_treating" title="Heat treating">Heat treatment</a> methods</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Annealing_(metallurgy)" class="mw-redirect" title="Annealing (metallurgy)">Annealing</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Low_hydrogen_annealing" title="Low hydrogen annealing">Low hydrogen</a></li> <li><a href="/wiki/Annealing_by_short_circuit" title="Annealing by short circuit">Short circuit</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Hardening_(metallurgy)" title="Hardening (metallurgy)">Hardening</a> / <br /><a href="/wiki/Case-hardening" title="Case-hardening">Case-hardening</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ausforming" title="Ausforming">Ausforming</a></li> <li><a href="/wiki/Boriding" title="Boriding">Boriding</a></li> <li><a href="/wiki/Carbonitriding" title="Carbonitriding">Carbonitriding</a></li> <li><a href="/wiki/Carburizing" title="Carburizing">Carburizing</a></li> <li><a href="/wiki/Cryogenic_hardening" title="Cryogenic hardening">Cryogenic</a></li> <li><a href="/wiki/Ferritic_nitrocarburizing" title="Ferritic nitrocarburizing">Ferritic nitrocarburizing</a></li> <li><a href="/wiki/Induction_hardening" title="Induction hardening">Induction</a></li> <li><a href="/wiki/Nitriding" title="Nitriding">Nitriding</a></li> <li><a href="/wiki/Precipitation_hardening" title="Precipitation hardening">Precipitation</a></li> <li><a href="/wiki/Quench_polish_quench" title="Quench polish quench">Quench polish quench</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Tempering_(metallurgy)" title="Tempering (metallurgy)">Tempering</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Austempering" title="Austempering">Austempering</a></li> <li><a href="/wiki/Martempering" title="Martempering">Martempering</a></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cryogenic_treatment" title="Cryogenic treatment">Cryogenic treatment</a> (<a href="/wiki/Cryogenic_deburring" class="mw-redirect" title="Cryogenic deburring">Deburring</a></li> <li><a href="/wiki/Cryogenic_deflashing" title="Cryogenic deflashing">Deflashing</a></li> <li><a href="/wiki/Cryogenic_hardening" title="Cryogenic hardening">Hardening</a>)</li> <li><a href="/wiki/Differential_heat_treatment" title="Differential heat treatment">Differential heat treatment</a></li> <li><a href="/wiki/Decarburization" title="Decarburization">Decarburization</a></li> <li><a href="/wiki/Forming_gas" title="Forming gas">Forming gas</a></li> <li><a href="/wiki/Post_weld_heat_treatment" title="Post weld heat treatment">Post weld heat treatment</a></li> <li><a href="/wiki/Quenching" title="Quenching">Quenching</a></li> <li><a href="/wiki/Superplastic_forming" title="Superplastic forming">Superplastic forming</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_countries_by_steel_production" title="List of countries by steel production">Production by country</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Steel_industry_in_Bangladesh" title="Steel industry in Bangladesh">Bangladesh</a></li> <li><a href="/wiki/Steel_industry_in_China" title="Steel industry in China">China</a></li> <li><a href="/wiki/Iron_and_steel_industry_in_India" title="Iron and steel industry in India">India</a></li> <li><a href="/wiki/Steel_industry_in_Italy" title="Steel industry in Italy">Italy</a></li> <li><a href="/wiki/Steel_industry_in_Luxembourg" title="Steel industry in Luxembourg">Luxembourg</a></li> <li><a href="/wiki/Steel_industry_in_Nigeria" title="Steel industry in Nigeria">Nigeria</a></li> <li><a href="/wiki/Iron_and_steel_industry_in_the_United_States" title="Iron and steel industry in the United States">United States</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" 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