①Quenched thiab tempered structural steel Cov ntsiab lus ntawm cov hlau no feem ntau yog li ntawm {{0}}.25% mus rau 0.55%. Rau cov txheej txheem ntawm qhov loj me me, thaum lub sij hawm quenching thiab tempering kho (quenching thiab tempering), yog tias cov hlau yog hardened nyob rau hauv cross-sectional, cov cuab yeej siv tau zoo. Yog hais tias cov hlau tsis hardened, dawb ferrite tshwm nyob rau hauv lub microstructure, thiab lub toughness txo. Rau cov hlau uas muaj kev npau taws, xws li manganese steel, chromium steel, nickel-chromium steel, thiab lwm yam, lawv yuav tsum tau txias sai sai tom qab tempering. Qhov tseem ceeb quenching txoj kab uas hla ntawm hom hlau no nce nrog qhov nce ntawm cov nplej loj thiab cov ntsiab lus alloy. Piv txwv li, 40Cr thiab 35SiMn steels yog hais txog 30 mus rau 40mm, thaum 40CrNiMo thiab 30CrNi2MoV steels yog hais txog 60 mus rau 100mm. Lawv feem ntau siv los tsim cov khoom siv xws li shafts thiab txuas cov pas nrig uas dais loj.
②Surface hardened structural steel Siv los tsim cov khoom uas muaj tawv thiab hnav-resistant nto thiab hloov tau yooj yim, xws li lub zog thiab cov ncej. Txhawm rau ua kom cov tub ntxhais ntawm cov khoom tawv, cov ntsiab lus carbon hauv cov hlau yuav tsum qis, feem ntau yog 0.12-0.25%, thiab yuav tsum muaj qhov tsim nyog ntawm cov ntsiab lus alloying kom tsim nyog. hardenability. Nitriding steel kuj yuav tsum tau ntxiv cov ntsiab lus alloying uas yooj yim rau kev tsim nitrides (xws li Al, Cr, Mo, thiab lwm yam). Carburizing lossis carbonitriding steel, tom qab carburizing los yog carbonitriding ntawm 850-950, quenching thiab low-temperature tempering (kwv yees 200) Nitriding steel yog siv ncaj qha tom qab nitriding kev kho mob (480-580) tsis quenching thiab tempering.
alloy steel tub
