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=== Legerede ståltyper ===
Der bliver bl.a. tilsat legeringsgrundstoffer for at få nye og bedre egenskaber for stålet, fx hårdheden, slidstyrken, hærdbarheden og mange andre.
* [[Rustfrit stål]]
* [[Værktøjsstål]]
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<!--Stainless steels contain a minimum of 11% chromium, often combined with nickel, to resist [[corrosion]]. Some stainless steels, such as the [[Ferrite (iron)|ferritic]] stainless steels are [[magnetic]], while others, such as the [[austenite|austenitic]], are nonmagnetic.<ref>{{cite web|url=http://steel.org |title=Steel Glossary |publisher= [[American Iron and Steel Institute]] (AISI)|accessdate=2006-07-30}}</ref> Corrosion-resistant steels are abbreviated as CRES.
 
[[Rustfrit stål]] indeholder mindst 11% chrom, ofte kombineret med nikkel, for at modstå [[korrosion]]. Nogle rustfri ståltyper, f.eks. [[Ferrit (jern)|ferritiske]], er [[magnetisk]]e, mens andre, f.eks. [[austenit]]iske, er umagnetiske. Korrosions-afvisende stål forkortes CRES ''(corrosion-resistant steels)''.
Some more modern steels include [[tool steel]]s, which are alloyed with large amounts of tungsten and [[cobalt]] or other elements to maximize [[solution hardening]]. This also allows the use of [[precipitation hardening]] and improves the alloy's temperature resistance.<ref name=EM2/> Tool steel is generally used in axes, drills, and other devices that need a sharp, long-lasting cutting edge. Other special-purpose alloys include [[weathering steel]]s such as Cor-ten, which weather by acquiring a stable, rusted surface, and so can be used un-painted.<ref>{{cite web|url=http://aisc.org/MSCTemplate.cfm?Section=Steel_Interchange2&Template=/CustomSource/Faq/SteelInterchange.cfm&FaqID=2311|archiveurl=//web.archive.org/web/20071222180444/http://aisc.org/MSCTemplate.cfm?Section=Steel_Interchange2&Template=/CustomSource/Faq/SteelInterchange.cfm&FaqID=2311|archivedate=2007-12-22|title=Steel Interchange|publisher= American Institute of Steel Construction Inc. (AISC)|accessdate=2007-02-28}}</ref> [[Maraging steel]] is alloyed with nickel and other elements, but unlike most steel contains little carbon (0.01%). This creates a very strong but still [[malleability|malleable]] steel.<ref>{{cite web|title = Properties of Maraging Steels|url = http://steel.keytometals.com/default.aspx?ID=CheckArticle&NM=103|accessdate=2009-07-19}}</ref>
 
[[Værktøjsstål]] er en moderne ståltype som er legeret med store mængder tungsten og kobolt eller andre grundstoffer for at maksimere [[hærdning]]en. Dette gør også legeringen mere modstandsdygtig over for høje temperaturer.<ref name=EM2/> Værktøjsstål bruges typisk i økser, bor og andre redskaber som behøver et skarpt, holdbart skær. Nogle øvrige legeringer til specielle formål er: [[cortenstål]], [[maragingstål]] og [[eglinstål]].
[[Eglin steel]] uses a combination of over a dozen different elements in varying amounts to create a relatively low-cost steel for use in [[bunker buster]] weapons. Hadfield steel (after Sir [[Robert Hadfield]]) or manganese steel contains 12–14% manganese which when abraded strain-hardens to form an incredibly hard skin which resists wearing. Examples include [[Continuous track|tank tracks]], [[bulldozer#Blade|bulldozer blade]] edges and cutting blades on the [[jaws of life]].<ref>[http://answers.com/topic/hadfield-manganese-steel Hadfield manganese steel]. Answers.com. McGraw-Hill Dictionary of Scientific and Technical Terms, McGraw-Hill Companies, Inc., 2003. Retrieved on 2007-02-28.</ref>
<!--In 2016 a breakthrough in creating a strong light aluminium steel alloy which might be suitable in applications such as aircraft was announced by researchers at [[Pohang University of Science and Technology]]. Adding small amounts of nickel was found to result in precipitation as nano particles of brittle B2 [[intermetallic]] compounds which had previously resulted in weakness. The result was a cheap strong light steel alloy—nearly as strong as [[titanium]] at ten percent the cost<ref name=pm20150204>▼
 
▲In 2016 a breakthrough in creating a strong light aluminium steel alloy which might be suitable in applications such as aircraft was announced by researchers at [[Pohang University of Science and Technology]]. Adding small amounts of nickel was found to result in precipitation as nano particles of brittle B2 [[intermetallic]] compounds which had previously resulted in weakness. The result was a cheap strong light steel alloy—nearly as strong as [[titanium]] at ten percent the cost<ref name=pm20150204>
{{cite news |last1=Herkewitz|first1=William |title=Scientists Invent a New Steel as Strong as Titanium ; South Korean researchers have solved a longstanding problem that stopped them from creating ultra-strong, lightweight aluminum-steel alloys |url=http://www.popularmechanics.com/technology/news/a13919/new-steel-alloy-titanium/?1443670416676=1 |work=Popular Mechanics |date=2015-02-04 }}</ref>—which is slated for trial production{{when|date=October 2015}} at industrial scale by [[POSCO]], a Korean steelmaker.<ref>{{cite news|title=Wings of steel: An alloy of iron and aluminium is as good as titanium, at a tenth of the cost|url=http://www.economist.com/news/science-and-technology/21642107-alloy-iron-and-aluminium-good-titanium-tenth|accessdate=February 5, 2015|work=The Economist|date=February 7, 2015|quote=E02715}}</ref><ref name=Nature02515>{{cite journal|author1=Sang-Heon Kim, Hansoo Kim & Nack J. Kim|title=Brittle intermetallic compound makes ultrastrong low-density steel with large ductility|journal=Nature|date=February 5, 2015|volume=518|issue=7537|pages=77–79|doi=10.1038/nature14144|pmid=25652998|url=http://www.nature.com/nature/journal/v518/n7537/full/nature14144.html|accessdate=February 5, 2015|publisher=Nature Publishing Group|quote=we show that an FeAl-type brittle but hard intermetallic compound (B2) can be effectively used as a strengthening second phase in high-aluminium low-density steel, while alleviating its harmful effect on ductility by controlling its morphology and dispersion.}}</ref>
 
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