Muaj ntau txhiab tus alloy steel qib thiab kaum tawm txhiab tus specifications siv thoob ntiaj teb. Cov zis ntawm alloy steel account rau li 10% ntawm tag nrho cov khoom siv hlau. Nws yog ib qho tseem ceeb ntawm cov khoom siv hlau dav siv hauv kev tsim kho kev lag luam hauv tebchaws thiab kev tsim kho kev tiv thaiv hauv tebchaws.
Txij li thaum xyoo 1970, txoj kev loj hlob ntawm alloyhigh-zog steelsthoob ntiaj teb tau nkag mus rau lub sijhawm tshiab. Raws li kev tswj dov technology thiab microalloying metallurgy, niaj hnub low-alloy high-strength steels, uas yog microalloyed steels, tau tsim lub tswv yim tshiab.
Nyob rau xyoo 1980, txoj kev loj hlob ntawm ntau yam uas muaj ntau yam kev lag luam thiab cov khoom siv tshwj xeeb tau mus txog nws qhov ncov nrog kev pab ntawm kev ua tiav hauv cov txheej txheem metallurgical.In the plaub-hauv-ib kev sib raug zoo ntawm cov tshuaj muaj pes tsawg leeg- txheej txheem- qauv-kev ua tau zoo. ntawm cov hlau, txoj hauj lwm tseem ceeb ntawm steel qauv thiab micro-zoo qauv yog tseem ceeb rau thawj zaug. Nws kuj qhia tau hais tias qhov kev tshawb fawb ntawm cov hlau tsis tshua muaj hlau tau dhau los ua neeg paub tab thiab tsis tau pom dua.Lub tswv yim tshiab ntawmalloy tsim.