ASTM A333 Gr.3 thiab Gr.6 yog ob feem ntau siv qis -kub carbon steel kav, nrog lub ntsiab sib txawv ntawm cov tshuaj muaj pes tsawg leeg, txhua yam khoom, qhov kub thiab txias, thiab corrosion kuj. Cov hauv qab no yog cov ncauj lus kom ntxaws sib piv:
Tshuaj muaj pes tsawg leeg
Cov ntsiab lus carbon: Gr.3 cov ntsiab lus carbon tsawg dua lossis sib npaug li 0.19%, Gr.6 Tsawg dua lossis sib npaug li 0.30%. Gr.6 tso cai rau cov ntsiab lus carbon ntau dua los txhim kho lub zog, tab sis yuav tsum tau kho cua sov kom zoo dua qhov tawv.
Alloying Elements: Gr.6 muaj cov lej ntawm npib tsib xee (tsawg dua lossis sib npaug li 0.40%), molybdenum (Less dua lossis sib npaug li 0.12%), thiab lwm yam, thaum Gr.3 tsis muaj lossis qis dua. Txij li xyoo 2016, Gr.6 tau ntxiv cov ntsiab lus xws li Cr, V, thiab Nb los txhim kho nws qhov kev ua haujlwm kub qis.
Mechanical Properties
Tensile Strength: Gr.6 Ntau dua lossis sib npaug rau 415 MPa, Gr.3 Ntau dua lossis sib npaug li 450 MPa.
Gr.3, vim nws qis - carbon tsim, muaj zog dua me ntsis tab sis superior toughness.
Impact Toughness: Gr.6 muaj qhov cuam tshuam lub zog Ntau dua lossis sib npaug ntawm 18J ntawm -45 degree, thaum Gr.3 tuav ntau dua lossis sib npaug rau 18J ntawm -100 degree.
Gr.3 yog tsim rau txawm tias qhov kub thiab txias ib puag ncig (xws li kua nitrogen cia tank).
Siv tau qhov ntsuas kub
Gr.6: -45℃rau -195℃(piv txwv li, petrochemical pipelines, natural gas thauj)
Gr.3: -100℃txog -195℃(cov khoom siv kub tsis tshua muaj xws li LNG cia tso tsheb hlau luam)
Corrosion Resistance thiab Application Scenarios
Gr.6: Vim nws cov nickel thiab molybdenum cov ntsiab lus, nws cov corrosion kuj yog superior rau Gr.3, ua rau nws haum rau corrosive ib puag ncig xws li tshuaj thiab roj / roj industries.
Gr.3: Feem ntau yog siv nyob rau hauv cov chaw ua kom huv si, xws li nuclear fais fab nroj tsuag cua txias tshuab.
Kev kho cua sov thiab txheej txheem
Gr.6: Yuav tsum tau normalizing (Ntau dua lossis sib npaug ntawm 815 degree) lossis normalizing + tempering los kho cov nplej thiab txhim kho toughness.
Gr.3: Feem ntau tsuas yog yuav tsum tau normalizing; txheej txheem yog yooj yim dua.
Cov ntsiab lus
Qhov sib txawv ntawm ob yog qhov tseem ceeb: Gr.6 qhia txog lub zog thiab corrosion kuj, haum rau nruab nrab - thiab qis- qhov kub thiab txias ib puag ncig; Gr.3 yog tsim los rau ultra- qhov kub thiab txias, muab lub zog zoo dua tab sis qis zog me ntsis.