440C vs 420 stainless hlau: high- Hardness Martensitic alloys

 

Ua li cas lawv cov tshuaj lom neeg sib txawv sib txawv?

420 muaj 12-14% chromium, 0.15-0.4% carbon, thiab tsis muaj molybdenum}} paab, 0.95 carbon, thiab 0.4-30% molybdenum,

Qhov twg txhim kho nws lub peev xwm ua kom tiav siab dua tom qab kev kho cua sov.

 

Qhov twg muaj cov hardness zoo dua thiab hnav tsis kam?

Tom qab kev kho cua sov, 440C ncav cuag 58 {- 60 hrc, harder ntau dua 420 {}} 55 hrc. Qhov no ua rau 440C ntau cov kev hnav-tiv taus, haum rau cov khoom siv siab thiab txiav cov khoom uas yuav tsum tau tswj cov npoo ntse.

 

Yuav ua li cas lawv sib piv hauv corrosion tsis kam?

440C muaj cov khoom lag luam zoo dua li 420 vim nws cov ntsiab lus chromium ntau dua, tiv taus xeb zoo dua hauv cov chaw noo. Ob qho tib si kov cov chaw qhuav, tab sis 440c tuav ntev dua hauv cov cua noo thiab cov tshuaj lom me me.

 

Dab tsi txog lawv cov khoom sib luag?

420 muaj ntau tshaj nyob rau hauv nws annealed xeev, yooj yim dua khoov thiab yuav tsum muaj ntau dua kev kho kom tsis txhob ua rau brittleness, tab sis nws tuav ib qho kev kho kom sov tom qab kev kho cua sov.

 

440C thiab 420 feem ntau siv?

420 nyob rau hauv kev phais cov cuab yeej, valve seem, thiab qis}} Tus nqi ceev, txiav cov cuab yeej xav tau kev xav tau ntau tshaj.