Ob Chromium{0}}Molybdenum Qib Sib Piv
AISI 4130 thiab GB/T 3077 30CrMo yog ob qho tib si chromium-molybdenum qis- alloy structural steels muab nyob rau hauv quenched thiab tempered mob. Lawv cov ntsiab lus chromium thiab molybdenum yog qhov tseem ceeb tib yam, yog li lawv sib koom tib tsev neeg ntawm cov khoom: zoo hardenability, siab zog ntawm nruab nrab seem qhov ntau thiab tsawg, thiab muaj txiaj ntsig tiv thaiv kom siab siab - qhov kub thiab txias. Cov lus nug tswv yim rau cov neeg yuav khoom tsis yog seb lawv zoo li cas rau ntawm daim ntawv, tab sis seb ib tus tuaj yeem hloov pauv rau lwm tus hauv cov kav dej lossis cov khoom siv machined.
4130 yog American alloy steel qib uas tau teev tseg hauv ASTM A519 rau seamless mechanical tubing thiab hauv ASTM A29 rau bar Tshuag . 30CrMo yog Suav hlau alloy structural steel qib them los ntawm GB / T 3077. Cov roj thiab roj cov khoom ua rau 4130 feem ntau txiav txim siab nrog kev xaiv ntawm ob chav kawm 4 lub zog yog 4 yam tsawg kawg nkaus: MPa, los yog 75 ksi, txog 517 MPa. Qhov twg cov yeeb nkab yog siv nyob rau hauv cov roj thiab roj, kev ntsuam xyuas feem ntau yog ntxiv rau cov khoom specification.
Kev sib piv tshuaj lom neeg
| Element | 4130 (ASTM A519 / AISI) | 30CrMo (GB/T 3077) |
|---|---|---|
| Carbon, C | 0.28 - 0.33 % | 0.26 - 0.33 % |
| Manganese, Mn | 0.40 - 0.60 % | 0.40 - 0.70 % |
| Silicon, Sib | 0.15 - 0.35 % | 0.17 - 0.37 % |
| Chromium, Cr | 0.80 - 1.10 % | 0.80 - 1.10 % |
| Molybdenum, Mo | 0.15 - 0.25 % | 0.15 - 0.25 % |
| Phosphorus, P | 0.040% max | 0.030% max |
| Sulfur, S | 0.040% max | 0.030% max |
Cov chromium thiab molybdenum ntau yam zoo ib yam, uas yog vim li cas ob qib coj zoo sib xws tom qab kev kho cua sov. Qhov sib txawv nyob rau hauv tramp - ntsiab lus thiab seem txwv: GB / T 3077 teeb tsa lub qab nthab nruj dua ntawm phosphorus thiab sulfur, yog li 30CrMo feem ntau yog cov hlau huv huv uas muaj kev pheej hmoo ntawm kev npau taws thiab qis dua - kub toughness. Qhov dav me ntsis manganese ntau nyob rau hauv 30CrMo muab me ntsis hardenability, thaum lub dav silicon ntau yam nyob rau hauv 4130 tsuas muaj ib tug me me rau cov neeg kho tshuab cwj pwm.
Mechanical Properties thiab Kev kho cua sov
Ob qib yog muab rau hauv qhov kub thiab txias thiab tsis tshua siv nyob rau hauv raws li -rolled xeev. GB / T 3077 muab 30CrMo qhov tsawg kawg nkaus tensile lub zog ntawm 930 MPa, qhov tsawg kawg nkaus tawm lub zog ntawm 785 MPa, qhov tsawg kawg nkaus elongation tom qab tawg ntawm 12%, qhov tsawg kawg nkaus txo ntawm thaj tsam ntawm 45%, thiab annealed hardness qab nthab ntawm txog 229 HBW. Cov qib Asmeskas feem ntau raug txiav txim mus rau chav kawm muaj zog ntau dua li ntawm ib lub rooj, yog li cov khoom siv muaj txiaj ntsig tau lees paub ntawm daim ntawv pov thawj zeb rau qhov kev txiav txim.
Kev xyaum ua yog kom austenitise nyob rau hauv ntau yam uas tag nrho yaj cov carbides tsis coarsening lub grain, quench nyob rau hauv cov roj kom tsis txhob tawg nyob rau hauv no hardenability chav kawm ntawv, thiab npau taws rau lub hom phiaj lub zog theem. Vim hais tias ob qho tib si steels teb tau zoo rau qhov kub thiab txias, cov kauj ruam tempering yog qhov khoom sib txawv ntawm 60 ksi thiab 75 ksi khoom tsim.
30CrMo thiab 4130 puas tuaj yeem hloov tau?
Vim hais tias cov ntsiab lus alloy yog sib npaug, kev hloov pauv yog technically ua tau nyob rau hauv ntau machined thiab tubular Cheebtsam, tab sis nws yuav tsum tsis txhob raug kho raws li tsis siv neeg. Peb cov xwm txheej yuav tsum txaus siab:
Specification txais:yog tias tus qauv tsim lossis kev xaj xaj npe rau qib lossis tus qauv, qib ntawd yuav tsum tau muab lossis qhov sib txawv raws li pom zoo.
Cov khoom sib npaug:Qhov hloov pauv yuav tsum ua tau raws li tib lub tensile, tawm los thiab hardness yuav tsum tau tom qab tib lub voj voog kho cua sov.
Kev pabcuam- cov cai tshwj xeeb:cuam tshuam toughness, hardness txwv rau qaub kev pab cuam, thiab tsis yog -destructive xeem theem yuav tsum tag nrho cov re- xyuas, vim cov hlau huv si tsis cia li txhais tau tias sib npaug toughness tom qab tempering.
Daim ntawv thov thiab kev taw qhia kev xaiv
Ob qib yog siv rau alloy steel seamless yeeb nkab, precision ci raj, laum dab tshos thiab lwm yam roj thiab roj Cheebtsam, siab - lub zog fasteners, thiab machined qhov chaw uas xav tau lub zog nrog me ntsis toughness. Kev xaiv feem ntau yog tsav los ntawm kev kos duab thiab cov neeg siv kawg: cov haujlwm tsim los rau Asmeskas cov qauv zoo li qhia 4130, thaum cov haujlwm hauv tsev thiab xa tawm xa mus rau Suav cov qauv qhia 30CrMo. Qhov twg yuav tsum muaj kev ntsuam xyuas ntawm qhov kub thiab txias, qhov nruj dua sulfur thiab phosphorus txwv ntawm 30CrMo yog qhov zoo dua, muab kev kho cua sov yog tswj kom tsis txhob npau taws. Qhov twg cov khoom yog machined los ntawm bar los yog raj thiab tom qab welded, cov pa roj carbon sib npaug ntawm ob qib hu rau preheat thiab tswj txias.
FAQ
Q: Puas yog 4130 thiab 30CrMo yog tib yam hlau?
Lawv tsis zoo ib yam, tab sis lawv nyob rau tib lub chromium-molybdenum tsev neeg thiab muaj chromium thiab molybdenum sib xws. Qhov sib txawv tseem ceeb yog nyob rau hauv phosphorus thiab sulfur txwv thiab nyob rau hauv manganese thiab silicon ntau yam.
Q: Cov chav kawm muaj zog npaum li cas rau 4130 tubing?
Ob chav kawm feem ntau raug txiav txim: qhov tsawg kawg nkaus lub zog ntawm 60 ksi, kwv yees li 414 MPa, thiab 75 ksi, kwv yees li 517 MPa. Cov txiaj ntsig tseeb tau lees paub ntawm daim ntawv pov thawj zeb rau qhov kev txiav txim siab kho cua sov.
Q: Vim li cas 30CrMo feem ntau yog huv dua li 4130?
GB / T 3077 txwv phosphorus thiab sulfur rau 0.030% siab tshaj plaws, piv nrog 0.040% siab tshaj hauv qib Asmeskas, yog li cov ntsiab lus seem qis dua thiab qhov kev pheej hmoo ntawm embrittlement txo.
Q: Qhov nruab nrab quenching twg haum rau cov qib no?
Roj quenching yog qhov kev xaiv ib txwm muaj, vim tias ob qib muaj peev xwm hardenability txaus los ntawm cov phab ntsa tuab thiab cov roj txo qhov kev pheej hmoo ntawm quench cracking piv nrog dej.
Q: Cov qib ob puas tuaj yeem welded?
Yog lawm, tab sis ob qho tib si yog nruab nrab - carbon alloy steels nrog cov pa roj carbon ntau sib npaug. Vuam yuav tsum tau preheat, tswj interpass kub, qis- hydrogen consumables thiab post-weld tshav kub kho qhov twg phab ntsa thickness los yog kev pab cuam tej yam kev mob xav tau nws.
Q: Puas yog kev txiav txim roj thiab roj xav tau kev kuaj xyuas?
Feem ntau yog. Kev ntsuas qhov cuam tshuam tsis yog ib feem ntawm cov khoom siv yooj yim rau cov qib no hauv txhua qhov xwm txheej, yog li qhov ntsuas kub, qib zog thiab qhov ntsuas zaus yuav tsum tau teev nyob rau hauv kev yuav khoom specification.
Q: Puas yog 30CrMo txais tau raws li kev hloov pauv ncaj qha yam tsis muaj kev tsim nyog?
Tsis yog. Txawm tias muaj chemistry sib npaug, qhov kev hloov pauv yuav tsum tsim nyog los ntawm chemistry, kev sim tshuab thiab, qhov cuam tshuam, tsis yog -kev kuaj kev puas tsuaj, thiab nws yuav tsum raug lees txais los ntawm tus neeg siv khoom kawg.
