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.
Xyoo 1980s, kev txhim kho ntau yam uas muaj cov txheej txheem sib txawv ntawm cov txheej txheem ntawm cov hlau ua haujlwm thiab cov kev sib raug zoo ntawm cov qauv tshuaj-txheej txheem-qauv Ntawm cov hlau, qhov tseem ceeb ntawm cov qauv hlau thiab cov qauv micro-nplua yog tau hais tseg rau thawj zaug. 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.