Muaj ntau txhiab ntawm Alloy Steel qib thiab kaum tawm txhiab tus neeg tshwj xeeb siv thoob ntiaj teb. Cov zis ntawm Alloy Steel account rau li 10% ntawm tag nrho cov hlau tso zis. Nws yog ib qho tseem ceeb siv hlau khoom siv dav hauv kev tsim kho kev lag luam hauv tebchaws thiab kev tiv thaiv kev ua teb chaws.
Txij li xyoo 1970, kev txhim kho ntawm alloyCov Hlau High-Lub Zogthoob ntiaj teb tau nkag mus rau lub sijhawm tshiab. Raws li kev tswj hwm dov thev naus laus zis thiab microalloying metallgy, niaj hnub tsawg-alloy high-zog polloalloyloyed hlau, muaj lub tswv yim microalloyloy, tau tsim lub tswv yim.
Thaum xyoo 1980s, kev txhim kho ntau yam uas muaj kev sib raug zoo ntawm cov txheej txheem ntawm cov hlau thiab cov khoom siv tshwj xeeb ntawm cov qauv siv tshuaj tua hluav taws xob Nws tseem qhia tau tias kev tshawb fawb yooj yim ntawm cov hlau qis-hlau tau dhau los ua cov laus thiab tsis muaj peev xwm tshiab ntawmAlloy Tsim.