Cov ntaub ntawv sib txawv ntawm pob ntsia hlau, vim nws cov sib xyaw sib txawv, hauv kev sib txawv, hauv hardness thiab corrosion tsis kam pom qhov sib txawv. Qhov no yog qhov tseeb tshwj xeeb tshaj yog thaum muab piv cov khoom ntawm ob cov ntaub ntawv tseem ceeb: Alloy Steel thiab Stainless hlau. Kev sib txawv tshwj xeeb yog raws li hauv qab no:
Steel pob screws (cov khoom siv steel: SOJ2 siab {- Carbon Charomium cov kabmob hlau, scm440 alloy qauv hlau)
1.hardness
Lub saum npoo hardness ntawm alloy steel pob screws tuaj yeem ncav cuag hrc58 {{4 4 - {los ntawm quenching thiab tempering. Qhov av siab loj heev txhim kho qhov kev ua txhaum cai thiab kheej kheej thiab txo cov kev ua kom txaus siab thaum tsav ntev. Yog li ntawd, nws yog qhov tseem haum rau lub tshuab cuab txiav, cov cuab yeej siv tshuab hluav taws xob thiab lwm yam kev siv hluav taws xob siab, kom muaj kev ruaj khov ntev.
2.Corrosion Kuj
Alloy hlau feem ntau yog tsim ntawm cov hlau, carbon, chromium, molybdenum thiab lwm yam me me alloy. Cov ntsiab lus chromium feem ntau tsawg dua 10% thiab tsis muaj kev tiv thaiv xeb txaus. Qhov no ua rau lawv raug rau oxidation thiab xeb hauv cov hws khov thiab thaum muaj cov acids me me, ua rau pob jamming thiab txo kev sib kis tau. Yog li ntawd, Alloy Hlau Pob Screws yuav tsum tau siv cov kab kev tiv thaiv xws li cov kab ntau lawm, lub tshuab ua hluav taws xob thiab lwm qhov chaw qhuav, huv si sab hauv ib puag ncig.
ii. Stainless Hlau Pob Screws (cov khoom siv uas: Sus440c Martensitic Stainless Hlau, Sus304 Austenitic Stainless Hlau)
1.Huardness yam ntxwv
Lub hardness ntawm stainless pob screws sib txawv ntau raws li cov khoom siv:
Tom qab kev kho cua sov saum npoo hardness nto hardness nto hatensitic stainless hlau tuaj yeem ncav cuag HRC55-58, uas yog ze rau lub hardness ntawm alloy steel. Txawm li cas los xij, txoj kev nruj ntawm cov tub ntxhais yog qis dua thiab lub zog nyuaj nyuaj yog qhov phem dua. Qhov no ua rau nws haum rau cov ntawv thov yuav tsum tau ua kom muaj hardness thiab corrosion tsis kam. Sus304 Austenitic Stainless hlau tsis xav tau kev kho cua sov thiab muaj qhov qis dua HV150-200 (kwv yees kom qis dua Alloy Steel thiab Sus440c Martensitic Stainless hlau sus Qhov no ua rau muaj kev tsis zoo ua tsis kam, ua haujlwm nyob rau hauv cov kev thauj khoom siab ntev, yooj yim ua rau kev coj ua Raceway thiab txo qhov raug.
2. Corrosion Kuj
Stainless hlau cov tseem ceeb tau txais nws cov zoo tshaj plaws corrosion. Nws cov ntsiab lus Chromium tsis yog tsawg kawg yog 12%, ntawm uas Sus304 Austenitic Stainless Hlau yog 18-20% thiab sus440c martensitic stainless hlau 16-18%. Qhov no chromium keeb txheej ua rau cov txheej txheem chromium thiab tsis muaj cov organic acids thiab alkali, xws li organic acids nyob rau hauv cov khoom noj khoom haus thiab ntsev dab. Raws li qhov tshwm sim, stainless hlau pob screws tuaj yeem siv rau lub sijhawm ntev ntawm cov khoom siv tu (xws li kev ua zaub mov noj ua haus). Yog tsis muaj cov kev tiv thaiv nyuaj, kev pheej hmoo ntawm xeb yog qhov qis dua rau alloy pob screws.
