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Siv 40Cr steel, nruj me ntsis raws li cov txheej txheem yuav tsum, thawj qhov ntxhib machining, quenching thiab tempering tshav kub kho HRC30-35, semi-tiav thiab tiav tig, thiab thaum kawg sib tsoo kom ntseeg tau tias cov khoom zoo yog xeb-pov thawj, nruj me ntsis raws li nrog tolerances nrhiav pom.