30CrMo4 yog dab tsi
30CrMo4 yog chromium -molybdenum alloy steel, xaiv 1.7216 hauv EN 10027-2 tus lej lej. TS EN 10297-1 Cov txheej txheem rau seamless ncig steel raj rau kev siv tshuab thiab kev tsim vaj tsev. Cov chromium thiab molybdenum ntxiv muab cov hlau ua kom muaj zog microstructure, siab zog tom qab quenching thiab tempering, zoo qaug zog tsis kam, thiab nruab nrab weldability nrog ib tug carbon sib npaug ntawm 0.50 los yog hauv qab no. Vim tias qhov kev sib xyaw ua ke no, 30CrMo4 cov raj siv los ntawm cov khoom siv thauj khoom hnyav thiab yuav tsum muaj zog, tawv, thiab qhov tseeb.
Tshuaj muaj pes tsawg leeg
Cov muaj pes tsawg leeg ntawm 30CrMo4 yog tswj nyob rau hauv cov nram qab no ntau yam, uas ua raws li cov kev txwv ntawm EN 10297-1:
| Element | C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| Cov ntsiab lus,% | 0.26 – 0.34 | Tsawg dua los yog sib npaug li 0.40 | 0.60 – 0.90 | Tsawg dua lossis sib npaug li 0.025 | Tsawg dua lossis sib npaug li 0.035 | 0.80 – 1.15 | 0.15 – 0.30 |
Cov ntsiab lus carbon nyob rau hauv 0.26-0.34% ntau muab cov hlau txaus hardenability yuav tsum tau quenched rau tag nrho lub zog nyob rau hauv nyias seem, thaum chromium ntxiv qhov tob ntawm hardening thiab tsis kam mus softening, thiab molybdenum refines lub tempering teb thiab txhim kho toughness. Rau lub raj xa khoom, qhov txwv tsis pub leej twg tuaj yeem nruj los ntawm kev pom zoo thaum lub tshuab ua haujlwm lossis kev ntsuas tshwj xeeb suav nrog.
Mechanical Properties
30CrMo4 raj feem ntau xa tuaj rau hauv qhov quenched - thiab - tempered mob (+QT). Cov khoom siv kho tshuab yog thickness-nyob ntawm; Kev lees paub qhov tseem ceeb rau cov phab ntsa tuab yog 0.2% pov thawj lub zog tsawg kawg yog 600 MPa, lub zog tensile nyob rau hauv thaj tsam 750-950 MPa, thiab qhov tsawg kawg nkaus elongation ntawm 12% ntawm A5. Charpy tej yam yuav tsum tau pom zoo nyob rau ntawm qhov kev txiav txim theem, nrog rau qhov tseem ceeb xws li 35 J nruab nrab ntawm -20 C ib qho rau cov thov kev thov. Vim tias cov khoom hloov pauv nrog qhov loj me, qhov tseeb lav qhov tseem ceeb yuav tsum tau nyeem los ntawm EN 10297-1 rau qhov txiav txim siab phab ntsa tuab.
| Khoom | Yam yuav tsum tau muaj (QT condition) |
|---|---|
| Pov thawj zog Rp0.2, MPa, min | 600 |
| Tensile zog Rm, MPa | 750 – 950 |
| Elongation A5, %, min | 12 |
| Impact zog KV, -20 C, J | 35 (yog tias pom zoo) |
Kev kho cua sov thiab kev tsim khoom
Cov txheej txheem ntau lawm yog kub dov ua raws li kev kos duab txias kom meej qhov ntev thiab txhim kho nto, nrog rau lub raj ces hardened thiab tempered. quenching yog ua los ntawm li 850-880 C nyob rau hauv cov roj los yog polymer quenchant, ua raws li los ntawm tempering nyob rau hauv lub cheeb tsam ntawm 540-660 C, uas teem lub kawg lub zog - toughness tshuav nyiaj li cas. Lub + QT lub npe ntawm daim ntawv pov thawj lees paub qhov kev kho mob no. Welded hlab ntawm cov hlau no tsis yog ib txwm EN 10297-1 khoom; qhov twg yuav tsum tau welded tsim, tom qab-weld kho cua sov yog tsim nyog los kho cov khoom ntawm tshav kub-kho thaj tsam, thiab cov txheej txheem weld yuav tsum tsim nyog.
Dimensional Tolerances
Precision kam rau ua yog ib qho laj thawj tseem ceeb rau xaiv cov khaub thuas-kos raj. Cov kev lag luam zoo rau kev lag luam yog ib txoj kab nruab nrab ntawm ntxiv lossis rho tawm 0.8% nrog qhov tsawg kawg nkaus ntawm 0.4 hli, phab ntsa tuab ntawm ntxiv lossis rho tawm 8% nrog qhov tsawg kawg nkaus ntawm 0.4 hli, thiab qhov ncaj ntawm 1.2 hli ib meter lossis zoo dua. Rau machined Cheebtsam xws li hydraulic thooj voos kheej kheej thiab shafts, tus neeg yuav khoom yuav tsum tau hais tias lub raj yog muab nyob rau hauv raws li - kos mob los yog nrog ib tug machined los yog hauv av nto.
Daim ntawv thov
30CrMo4 cov hlab yog siv rau siab -kev nyuaj siab engineering Cheebtsam: tsav shafts, gearbox qhov chaw, steering Cheebtsam, hydraulic lub tog raj kheej chim nyob rau hauv high pressures, pneumatic systems, thiab tshuab qhov chaw uas sib txuas lub zog nrog qaug zog tiv thaiv. Lawv kuj ua hauj lwm nyob rau hauv nruab nrab elevated - qhov kub thiab txias kev pab cuam nyob rau hauv lub hwj chim thiab txheej txheem nroj tsuag qhov kub nyob rau hauv qis dua 500 C. Cov hlau tsis pom zoo rau kev pab ntev tshaj li 550 C, qhov twg carbide coarsening txo lub zog, thiab nws tsis yog inherently haum rau qaub (hydrogen sulphide) kev pab tshwj tsis yog tshwj xeeb kho thiab pom zoo.
Kev xeem thiab ntawv pov thawj
EN 10297-1 yuav tsum muaj kev sim tensile raws li EN ISO 6892-1 thiab, thaum pom zoo, kev ntsuas cuam tshuam rau ISO 148-1. Kev ntsuam xyuas tsis muaj kev puas tsuaj ntawm cov raj seamless yog ua raws li ISO 10893 series, piv txwv li kev ntsuas tag nrho lub cev ultrasonic rau ISO 10893-10. Daim ntawv pov thawj zeb kuaj tau muab rau EN 10204, feem ntau 3.1, thiab 3.2 tuaj yeem npaj nrog lub cev tshuaj xyuas ywj pheej. Rau cov ntawv thov siab hauv EU, ua raws li Cov Lus Qhia Cov Khoom Siv Siab thiab cov ntawv ceeb toom-lub cev yuav tsum tau lees paub nyob rau theem kev txiav txim.
Cov lus nug nquag
Q: Dab tsi tus qauv npog 30CrMo4 seamless raj?
TS EN 10297-1 - Ntu 1: Ntu 1: Ntu 1: Ntu 1: Ntu 1: Kev txiav txim siab seamless steel raj rau kev siv tshuab thiab kev tsim vaj tsev dav dav Cov khoom siv ntawm 30CrMo4 yog 1.7216.
Q: Dab tsi yog 30CrMo4 ib txwm muab rau hauv?
quenched thiab tempered (+ QT), uas muab cov ntaub ntawv pov thawj lub zog tsawg kawg yog 600 MPa thiab tensile ntau ntawm 750-950 MPa rau cov phab ntsa tuab.
Q: 30CrMo4 raj puas tuaj yeem welded?
Yog, nrog cov txheej txheem tsim nyog thiab feem ntau nrog preheat. Cov pa roj carbon sib npaug yog nruab nrab, yog li welding yog ua tau, tab sis tom qab -weld heat treatment yog ib txwm xav tau los kho qhov tawv thiab txo kev ntxhov siab.
Q: 30CrMo4 siv rau dab tsi?
Siab -cov khoom siv dag zog xws li cov ncej tsav, lub tog raj kheej, lub tog raj kheej hydraulic, thiab cov khoom siv pneumatic, ntxiv rau nruab nrab - qhov kub thiab txias kev pab cuam txog li 500 C.
Q: Yuav ua li cas yog cov cuab yeej kho tshuab kuaj xyuas?
Los ntawm kev ntsuas tensile rau EN ISO 6892-1, xaiv tau Charpy cuam tshuam kev sim rau ISO 148-1, thiab tsis muaj kev puas tsuaj rau ISO 10893 series, nrog rau daim ntawv pov thawj zeb rau EN 10204 3.1.
Q: Puas yog 30CrMo4 zoo ib yam li 42CrMo4?
Tsis yog. 42CrMo4 (1.7225) muaj cov pa roj carbon ntau dua thiab muaj zog dua thiab nyuaj dua tab sis tsawg dua ductile. 30CrMo4 raug xaiv thaum muaj zog thiab qaug zog ua haujlwm ntau dua li qhov siab tshaj plaws.
