Nrog rau cov txheej txheem siab heev xws li dual quenching, low-tenperature tenpering thiab tshuaj nrog qis hlau cov ntsiab lus thiab niaj hnub tswj cov cuab yeej peb prodrcts neet the nattional standard.GB6484-86(forcast steel shot) thiab GB6485-86(forcast steel grit) ).






