S355j2h seamless steel yeeb nkab chaw tsim tshuaj paus kev muag khoom
S355J2 yuav tsum ua raws li en10025-2: 2004 (tus qauv qub (en10025: 1990))
C: ≤0.22; Si: ≤0.55; Mn: ≤1.60; P: ≤0.025; S: ≤0.025; Cu: ≤ 0.55 ℃
-20 ℃: ≥27.
(Mpa): ≤16mm: ≥355:16-40: ≥345; 40–63: ≥335; 63–80: ≥325;
80–100: ≥315; 100–150:295; 150–200: ≥285; 200–250: ≥275; 250-400: ≥265.
S355jo yog ib qho European txheem kub dov structural steel khoom.
S355jo siv tus qauv en10025-2: 2004 (Tus qauv qub (en10025: 1990))
Lub quenching kub ntawm qis-kub steel yeeb nkab yog A3 + (30 ~ 50) ℃. Hauv kev xyaum, qhov kev txwv siab tshaj yog feem ntau coj. Kev kub siab quenching tuaj yeem ua kom cov cua kub ceev ntawm cov yeeb nkab uas tsis tshua muaj kub, txo qhov oxidation thiab txhim kho kev ua haujlwm. Yuav kom homogenize lub austenite ntawm lub workpiece, txaus tuav lub sij hawm yuav tsum tau. Yog hais tias lub cub tawg tiag tiag loading loj, lub sij hawm tuav yuav tsum tau ncua kom tsim nyog. Txwv tsis pub, tsis txaus hardness yuav tshwm sim vim cua sov tsis sib xws. Txawm li cas los xij, yog tias lub sijhawm tuav ntev dhau lawm, qhov tsis zoo ntawm cov nplej ntxhib thiab hnyav oxidation decarburization tseem yuav tshwm sim, uas yuav cuam tshuam rau quenching zoo. Peb ntseeg hais tias yog tias tus nqi them ntau dua li tau teev tseg hauv cov ntaub ntawv txheej txheem, lub sijhawm cua sov thiab tuav yuav tsum tau txuas ntxiv los ntawm 1 / 5.
Vim tias qhov hardenability ntawm cov yeeb nkab uas tsis tshua muaj kub tsis tshua muaj, 10% brine tov nrog cov cua txias siab yuav tsum tau siv. Lub workpiece yuav tsum tau quenched kom huv si tom qab nkag mus rau hauv dej, tab sis tsis txias kom huv si. Yog hais tias 45 # precision steel yeeb nkab tau txias kom huv si hauv dej ntsev, lub workpiece yuav tawg, uas yog tshwm sim los ntawm kev hloov pauv sai ntawm austenite rau hauv martensite thaum lub workpiece txias txog li 180 ℃, ua rau muaj kev ntxhov siab ntau dhau. Yog li ntawd, thaum quenched low-temperature steel yeeb nkab yog ceev ceev txias rau qhov kub thiab txias, yuav tsum tau siv txoj kev txias qeeb. Txij li thaum lub qhov hluav taws xob dej kub yog qhov nyuaj rau tus tswv, nws yuav tsum tau ua los ntawm kev paub. Thaum tuav lub workpiece hauv dej nres, lub qhov hluav taws xob dej tuaj yeem ua kom cua txias (roj txias yog qhov zoo dua). Tsis tas li ntawd, lub workpiece yuav tsum txav tsis zoo li qub thaum nkag mus rau hauv dej, thiab ua kom tsis tu ncua raws li cov duab ntawm lub workpiece. Static txias nruab nrab thiab zoo li qub workpiece ua rau tsis sib xws hardness thiab kev ntxhov siab, ua rau loj deformation thiab txawm tawg ntawm workpiece.
Lub quenched hardness ntawm qis-kub steel yeeb nkab quenched thiab tempered qhov chaw yuav tsum ncav cuag hrc56 ~ 59, thiab muaj peev xwm ntawm loj seem yog qis dua, tab sis nws yuav tsum tsis txhob qis dua hrc48. Txwv tsis pub, nws txhais tau hais tias lub workpiece tsis tau quenched kiag li, thiab sorbite los yog txawm ferrite qauv yuav tshwm sim nyob rau hauv cov qauv. Cov qauv no tseem khaws cia rau hauv matrix los ntawm tempering, uas tsis tuaj yeem ua tiav lub hom phiaj ntawm quenching thiab tempering.
Rau qhov kub-kub tempering ntawm qis-kub steel yeeb nkab tom qab quenching, cov cua kub kub feem ntau yog 560 ~ 600 ℃, thiab hardness yuav tsum yog hrc22 ~ 34. Vim hais tias lub hom phiaj ntawm quenching thiab tempering yog kom tau txais cov khoom siv txhua yam, hardness. ntau yog kuj dav. Txawm li cas los xij, yog tias daim duab muaj qhov xav tau hardness, tempering kub yuav tsum tau hloov kho raws li qhov yuav tsum tau kos duab kom ntseeg tau qhov hardness. Piv txwv li, ib co ncej qis-kub steel kav yuav tsum muaj zog thiab siab hardness; Rau qee lub zog thiab ncej nrog qhov tseem ceeb, qhov yuav tsum tau ua kom tawv nqaij qis dua vim tias lawv yuav tsum tau milled thiab ntxig tom qab quenching thiab tempering. Lub sijhawm tempering tuav yog nyob ntawm qhov xav tau hardness thiab qhov loj ntawm lub workpiece. Peb ntseeg hais tias qhov hardness tom qab tempering nyob ntawm qhov kub thiab txias thiab muaj me ntsis ua rau lub sij hawm tempering, tab sis nws yuav tsum tau rov nkag mus. Feem ntau, tempering tuav lub sij hawm ntawm lub workpiece yog ntau tshaj ib teev.
