SUS420J2 Stainless Hlau: Siab -Carbon Martensitic Qib rau Txhim Kho Hnav Ua Haujlwm

SUS420J2 yog siab- carbon variant ntawm 420 series martensitic stainless hlau (C=0.26%-0.35%, Cr=12.0%-14.0%). Piv nrog SUS420J1, nws cov ntsiab lus carbon ntau dua txhim kho hardenability thiab hnav tsis kam. Tom qab quenching thiab tempering, lub hardness tuaj yeem ncav cuag 52-57HRC, uas yog tsim rau cov khoom uas yuav tsum tau hnav ntau dua thiab tuav tuav.

Core Parameters

Chemical Composition (wt%): C=0.26-0.35, Si Less dua lossis sib npaug li 1.00, Mn Tsawg dua lossis sib npaug rau 1.00, P Tsawg dua lossis sib npaug rau 0.040, S Less dua lossis sib npaug rau 0.030, Cr=12.00-14.00, Fe=Sib npaug

Mechanical Properties (Quenched & Tempered): Tensile Strength Ntau dua los yog sib npaug rau 820MPa, Tawm Lub Zog Ntau dua lossis sib npaug rau 620MPa, Elongation Ntau dua lossis sib npaug li 12%, Hardness 52-57HRC

Kev Pabcuam Kub: -20℃txog 300℃(kev pabcuam txuas ntxiv)

Qib sib npaug: EN 1.4028, UNS S42020, GB / T 30Cr13

Kev Ua Haujlwm Zoo: Siab hardness thiab zoo heev hnav tsis kam tshaj SUS420J1; zoo grindability, tuaj yeem polished rau ib nrab - daim iav tiav; muaj zog ntug tuav, haum rau tej cuab yeej; zoo seem stability tom qab kev kho cua sov; tus nqi- zoo piv nrog cov qib siab - carbon martensitic qib xws li 440 series.

Tej kev siv: High-Highness chav ua noj riam, riam tua tsiaj, riam siv hluav taws xob, cov kabmob thiab cov kev sib tw, lub rooj zaum valve rau nruab nrab- cov tshuab ua haujlwm siab, pwm cores rau hnav- cov yas molding, ntsuas cov cuab yeej (xws li gauges), textile machine needles, marine hardware.

Tswv yim Q&A

Q1: Dab tsi yog txheej txheem kev kho cua sov yuav tsum tau txais rau SUS420J2 kom ua tiav qhov siab tawv? A1: Quench ntawm 1000-1070 degree, roj txias + kub ntawm 150-200 degree, cua txias. Cov txheej txheem no tuaj yeem ua kom muaj zog ntawm 52-57HRC. Nws yuav tsum tau muab sau tseg tias tempering ntawm 300-450℃yuav tsum tau zam, vim hais tias qhov kub ntawm no yuav ua rau temper brittleness thiab txo qhov cuam tshuam toughness.

Q2: Qhov hnav tsis kam ntawm SUS420J2 piv nrog SUS420J1 li cas? A2: Nyob rau hauv tus qauv abrasive coj mus kuaj, qhov hnav poob ntawm SUS420J2 tom qab 1000 cycles tsuas yog 0.02g, thaum lub SUS420J1 yog 0.035g. Qhov hnav tsis kam ntawm SUS420J2 yog 1.5-2 npaug ntawm SUS420J1, uas yog qhov tsim nyog rau cov xwm txheej hnav siab.

Q3: SUS420J2 puas tuaj yeem ua haujlwm txias? A3: Kev ua haujlwm txias yog qhov nyuaj hauv lub xeev hardened vim muaj hardness siab. Nws yuav tsum txias ua hauj lwm hauv lub xeev annealed (hardness Tsawg dua los yog sib npaug rau 229HB), thiab ib qho deformation yuav tsum tsis pub tshaj 20% kom tsis txhob tawg. Intermediate annealing (780-830 degree, cua txias) yuav tsum tau tom qab ntau yam kev ua haujlwm txias.

Q4: Yuav ua li cas ntsuas tau los txhim kho corrosion kuj ntawm SUS420J2? A4: Tom qab kev kho cua sov, ua cov kev kho mob passivation nrog 20% ​​nitric acid tov (chaw kub, 30 feeb) los tsim ib tug ntom chromium oxide zaj duab xis; siv cov tshuaj tiv thaiv- xeb roj lossis pleev xim rau ntawm qhov chaw rau kev tiv thaiv hauv qhov chaw ntub lossis corrosive; zam kev sib cuag nrog cov kua qaub thiab cov tshuaj chloride ions ntev.

Q5: Puas yog SUS420J2 haum rau kev ua cov kabmob? A5: Yog. Nws yog qhov tsim nyog rau qis- nrawm thiab nruab nrab-load bearing pob thiab raceways. Nws lub siab tawv (52-57HRC) thiab hnav tsis kam tuaj yeem ua kom lub neej kev pab cuam ntawm bearings. Rau siab -ceev thiab high-load bearings, nws raug nquahu kom siv SUS440C uas muaj zog dua thiab hnav tsis kam.