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 ntaub ntawv tshwj xeeb tau mus txog nws lub ncov nrog kev pab ntawm kev ua tiav hauv metallurgical txheej txheem thev naus laus zis.In the four-in-one relationship of chemical composition-process-structure-performance of steel, the dominant position of steel structure and micro-fine structure is highlighted for the first time. 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.