GENERAL
Gnee 420 steel yog martensitic stainless hlau uas muaj cov lus teb zoo heev rau kev kho cua sov ntawm quenching thiab tempering, nws tuaj yeem ua rau hardness siab tshaj plaws ntawm 48 thiab 52 HRC. Thaum siv cov yas ntu pwm, cov txheej txheem txhaj tshuaj nrhiav cov khoom zoo polishing, tiv thaiv corrosion nyob rau hauv ib puag ncig sib txawv thiab rau oxidation kub ze rau 500 degree C, thiab tsis kam hnav.
Chemical compositions {{0}} C (0.40) • Mn (0.50) • Si (0.40) • Cr (13.50) • V (0.25)
Muab cov xwm txheej - Muab annealed nrog lub siab tshaj plaws hardness ntawm 230 HB
APPLICATIONS
Kev sib xyaw ua ke ntawm nws cov khoom ua rau nws tsim nyog rau kev siv cov khoom siv pwm corrosive, piv txwv li, txhaj tshuaj chlorinated polymers, xws li PVC thiab acetate. Nyob rau hauv cov pwm kub khiav, raug mob siab rau huab cua noo thiab txhaj tshuaj abrasive polymers xws li, piv txwv li, ntim cov thermoset yas (Bakelite) thiab lwm yam ntxiv. Nws kuj tseem tsim nyog rau cov pwm hauv iav thiab optics kev lag luam. Nws kuj tseem siv tau rau hauv: cutlery, phais instrumentation, valve thiab twj tso kua mis Cheebtsam, shafts thiab lwm yam structural Cheebtsam.
Kev kho cua sov
Kev ntxhov siab: Hauv cov cuab yeej zoo li qub, tshem tawm cov khoom sib txawv hauv qhov ntxhib, kev hloov pauv sai sai hauv ntu, thiab lwm yam, kev kho kev ntxhov siab yuav tsum tau ua kom txo qis qhov sib txawv ntawm qhov ntev thiab cov duab sib txawv thaum lub sij hawm quenching thiab tempering. Kev kho mob yuav tsum nyob nruab nrab ntawm 600 txog 650 ° C rau tsawg kawg 2 teev. Txias maj mam hauv qhov cub kom 300 ° C thiab tom qab ntawd cua txias.
Temper : austenize from the temperature of 1025ºC. Heat for 1 hour for every 25mm of thickness and add an additional 1 hour for every 25mm. Cold air, hot oil, salt bath or nitrogen pressure in a vacuum furnace. During heating to austenitization, 2 preheating should be carried out to ensure temperature uniformity and minimize distortions.
Tempering: It should be done immediately after hardening when the temperature reaches approximately 70ºC. The tempering temperature must be selected according to the desired hardness. This steel can be tempered in the range of 520 degree C to 200 degree C or a hardness level of around 48 to 52 HRC. Maintain the tempering temperature for at least 1 hour for every 25 mm of thickness, for at least 2 hours using double tempering. To optimize resistance to fracture, perform a third temper. The variation in hardness on temper is shown below the curve.
The cooling of 1025ºC. double temper for 2 hours each.
Thaum lub cuab yeej raug kho rau saum npoo, nitriding lossis txheej, yuav tsum xaiv qhov kub thiab txias. Daim duab qhia tau hais tias ob qho tib si tsis muaj tempering kub thiab corrosion kuj tseem tuav nyob rau theem siab dua nyob rau hauv annealed mob ntawm steel.
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