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[[Low alloy steel]] is alloyed with other elements, usually [[molybdenum]], manganese, chromium, or nickel, in amounts of up to 10% by weight to improve the hardenability of thick sections.<ref name=EM2/> [[HSLA steel|High strength low alloy steel]] has small additions (usually < 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase.<ref>{{cite web|url=http://resources.schoolscience.co.uk/Corus/16plus/steelch3pg1.html|title=High strength low alloy steels|publisher=Schoolscience.co.uk|accessdate=2007-08-14}}</ref>
Recent [[Corporate Average Fuel Economy]] (CAFE) regulations have given rise to a new variety of steel known as Advanced High Strength Steel (AHSS). This material is both strong and ductile so that vehicle structures can maintain their current safety levels while using less material. There are several commercially available grades of AHSS, such as [[dual-phase steel]], which is heat treated to contain both a ferritic and martensitic microstructure to produce a formable, high strength steel.<ref>{{cite web|title=Dual-phase steel|publisher=Intota Expert Knowledge Services|url=http://www.intota.com/experts.asp?strSearchType=all&strQuery=dual%2Dphase+steel|accessdate=2007-03-01}}</ref> Transformation Induced Plasticity (TRIP) steel involves special alloying and heat treatments to stabilize amounts of [[austenite]] at room temperature in normally austenite-free low-alloy ferritic steels. By applying strain, the [[austenite]] undergoes a [[phase transition]] to martensite without the addition of heat.<ref>{{cite web|last=Werner |first=Ewald |title=Transformation Induced Plasticity in low alloyed TRIP-steels and microstructure response to a complex stress history |url=http://www.wkm.mw.tum.de/Forschung/projekte_html/transtrip.html |accessdate=2007-03-01 |deadurl=yes |archiveurl=https://web.archive.org/web/20071223184922/http://www.wkm.mw.tum.de/Forschung/projekte_html/transtrip.html |archivedate=December 23,. december 2007 }}</ref> Twinning Induced Plasticity (TWIP) steel uses a specific type of strain to increase the effectiveness of work hardening on the alloy.<ref>{{cite web|last=Mirko|first=Centi|author2=Saliceti Stefano |title=Transformation Induced Plasticity (TRIP), Twinning Induced Plasticity (TWIP) and Dual-Phase (DP) Steels|publisher=Tampere University of Technology |url=http://www.dimet.unige.it/resta/studenti/2002/27839/26/TWIP,TRIPandDualphase%20mirko.doc |archiveurl=//web.archive.org/web/20080307200557/http://www.dimet.unige.it/resta/studenti/2002/27839/26/TWIP,TRIPandDualphase+mirko.doc |archivedate=2008-03-07|accessdate=2007-03-01}}</ref>-->
=== Legerede ståltyper ===
[[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]].
<!--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,. februar 2015|work=The Economist|date=February 7,. februar 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,. februar 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,. februar 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>
=== Standards ===