Qib:20 steel
Txheem:GB/T 699-1999

yam ntxwv
Kev siv yog me ntsis siab tshaj 15 steel, tsis tshua muaj quenching, tsis temper brittleness txias deformation plasticity siab dav rau khoov calender flanging thiab rauj ua, xws li arch arc vuam thiab kuj welding zoo vuam kev ua tau zoo, vuam thaum lub thickness me me, nruj tsos los yog Cov duab ntawm cov khoom nyuaj ua rau tawg ntawm kev txiav machining lub xeev ntawm txias kos lossis normalizing annealing mob zoo feem ntau siv hauv kev tsim khoom ntawm lub zog tsis loj thiab siab toughness
Cov hlau belongs rau cov hlau tsis muaj roj carbon zoo, txias extrusion carburized hardening hlau, cov hlau tsis muaj zog, zoo toughness, yas thiab weldability, tensile zog ntawm 355-500mpa, elongation tus nqi ntawm 24%.
Normalizing tuaj yeem txhawb cov spheroidization ntawm cov hlau, kho qhov loj block proeutectoid ferrite, thiab txhim kho qhov kev ua tau zoo ntawm cov blanks tsawg dua 160HBS.
Txoj kev thev naus laus zis ntawm lubhlauTuag qhov chaw yog: lub casting forging tuag dawb paug annealing machinery ntxhib machining txias extrusion molding recrystallization annealing machinery zoo machining carburizing quenching tempering sib tsoo polishing los ua ke

tshuaj muaj pes tsawg leeg
C: 0.17% ~ 0.24%
Yog ': 0.17% ~ 0.37%
Mn: 0.35% ~ 0.65%
S: 0.035%
P: 0.035%
Cr: 0.25%
Yog ': 0.25%
ua: 0,25
mechanical khoom
Tensile zog B (MPa): ≥410 (42)
Yield zog S (MPa): ≥245 (25)
Elongation 5 (%): ≥25
Qhov txo qis ntawm thaj tsam me me (%): 55 lossis ntau dua
Hardness: tsis kub kho, ≤156HB
Qauv loj: Qauv loj: 25mm

lwm yam ntaub ntawv

Kev kho cua sov specification: normalizing, 910 ℃, cua txias.

Metallographic qauv: ferrite + pearlite.
Kev kho cua sovntawm steel 20 thiab quenching hardness ntawm steel no. 20:
Kev kho cua sov ntawm 20 steel: Rau 20 steel, nws muaj peev xwm ua tau raws li qhov qub quenching hardness ntawm 30-35HRC.Vim cov cua kub kub yog siab dua, quenching deformation loj dua.View:
1. Tom qab kev ua haujlwm ntxhib, lub workpiece yog quenched tag nrho los ntawm kev kho cua sov (920 ℃ quenched brine), thiab tom qab ntawd ua tiav.Vim cov hardness yuav tsum ntawm 30-35HRC, tag nrho cov txheej txheem yuav tsum muaj peev xwm ua tau, tsis muaj dab tsi ntau tshaj qhov zoo hauv thiab sab nraum lub voj voog tsheb, kho keyway.
2. Tib yam ntxhib machining, puab qhov nto quenching los yog tsuas yog lub rooj quenching keyway (nyob ntawm seb qhov loj ntawm lub workpiece), thiab thaum kawg ua tiav.
3. Carburizing thiab quenching, sib tsoo lub puab lub qhov thiab keyway.
Cov txheej txheem ntws yog qhov thib ob, thib peb thiab feem ntau.
● Lub xeev xa khoom: kev xa khoom hauv lub xeev tsis muaj kev kho cua sov lossis kev kho cua sov (annealing, normalizing lossis kub tempering). Yog tias nws tsis tau qhia, kev xa khoom yuav tsum ua yam tsis muajKev kho cua sov.