Taw qhia: "Ntxoov ntxoo" Dilemma
Hauvlub ntiaj teb ntawm cov tshuab hnyav thiab kev tsim kho tsheb, cov ncej yog lub pob txha. Txawm hais tias nws yog tsav ncej rau lub tsheb thauj khoom, lub rotor ncej rau lub tshuab cua tshuab, lossis lub qag yooj yim rau lub conveyor, nws yuav tsum tiv taus lub zog, qaug zog, thiab poob siab.
Thaum xaiv cov khoom siv rau cov khoom tseem ceeb no, engineers yuav luag ib txwm nqaim nws mus rau ob qib legendary:TIAB SA 4140thiabTIAB SA 4340.
Ob leeg yog siab-lub zog, qis- hlau alloys. Ob leeg muaj ntau yam. Tab sis 4340 tus nqi ntau dua 4140.
Qhov no ua rau cov lus nug txog kev yuav khoom classic:
- "Kuv puas xav tau tus nqi kim 4340, lossis 4140 zoo txaus?"
- "Yuav ua li cas kuv them rau nrog tus nqi ntxiv?"
Ntawm Promisteel, peb muab ntau txhiab tons ntawm ob qib rau OEMs thoob ntiaj teb. Hauv phau ntawv qhia no, peb yuav rhuav tshem cov4140 vs 4340 Nwsdebate, tsom xam4140 steel zog, thiab pab koj xaiv txoj caisteel rau shaftstsis tshuab koj cov peev nyiaj.
Related Product: View Promisteel's Alloy Structural Steel Inventory >
Chemistry: Qhov txawv "Nickel".
To taubd kev ua tau zoo, peb yuav tsum saib daim ntawv qhia. Ob lub hlau muaj Chromium thiab Molybdenum (uas yog vim li cas lawv feem ntau hu ua "Chromoly" steels).
Txawm li cas los xij, muaj ib qho sib txawv loj heev:Nickel (Ni).
| Element | AISI 4140 (Cr{1}}Mo) | AISI 4340 (Cr-Ni-Mo) |
Qhov "Nickel" Factor |
| Cov pa roj carbon (C) | 0.38% - 0.43% | 0.38% - 0.43% |
Ib yam. Base hardness zoo ib yam. |
| Chromium (Cr) | 0.80% - 1.10% | 0.70% - 0.90% |
Ob leeg muab zoo hardness nkag. |
| Molybdenum (hli) | 0.15% - 0.25% | 0.20% - 0.30% |
4340 muaj me ntsis Mo rau cov cua sov. |
| Nickel (Ni) | Tsis muaj (<0.25%) | 1.65% - 2.00% |
Ntawm no yog qhov kev ua si hloov pauv. |
Vim li cas Nickel Matters?
Nickel yog kim, tab sis muaj zog. Hauv4340, uas ~ 1.8% Nickel cov ntsiab lus ua ob yam:
- Nce Toughness:Nws tiv thaiv cov hlau los ntawm nkig, tshwj xeeb tshaj yog nyob rau hauv qis kub.
- Deep Hardenability:Nws tso cai rau cov hlau kom tawvtag nrho txoj kev los ntawmmus rau lub hauv paus, txawm nyob rau hauv tuab heev seem (piv txwv li, shafts> 100mm txoj kab uas hla).
4140 Steel Properties vs 4340: Kev Ua Yeeb Yam Ua Yeeb Yam
Thaum peb koommpare4140 steel zogtawm tsam 4340, peb feem ntau saibHardenabilitythiabImpact zog.
Hardenability (Size Effect)
Qhov no yog qhov tseem ceeb tshaj plaws rausteel rau shafts.
- 4140:Nws yog "Medium Hardenability" steel. Yog tias koj ua kom sov kho qhov nyias nyias (xws li, 50mm), nws yuav nyuaj rau cov tub ntxhais. Tab sis yog tias koj tua ib qho loj 200mm ncej, qhov saum npoo yuav nyuaj, tab sis cov tub ntxhais yuav nyob twj ywm mos thiab tsis muaj zog.
- 4340:Nws muaj "High Hardenability." Ua tsaug rau cov Nickel, 200mm ncej ua los ntawm 4340 yuav ua tau zoo ib yam hardness thiab lub zog ntawm qhov chaw mus rau qhov chaw.
Toughness & Impact Resistance
- 4140:Zoo toughness rau kev siv dav dav.
- 4340:Zoo heev toughness. Nws tuaj yeem tiv taus qhov hnyav hnyav (xws li lub dav hlau tsaws iav lossis pob zeb crusher shafts) yam tsis muaj snapping.
Tensile zog
Ob leeg raug txiav txim siabtensile hlau.
- 4140:Hom Yield Strength (Q&T): 655 - 900 MPa.
- 4340:Hom Yield Strength (Q&T): 860 - 1050 MPa (thiab tuaj yeem mus ntau dua nrog kev kho cua sov tshwj xeeb).
Need high strength? Check our 4340 High Tensile Steel Specs >
Daim ntawv qhia: Xaiv cov hlau rau ncej
Yog li, koj okoj yuav tsum xaiv? Nov yog peb txoj cai ntawm tus ntiv tes xoo:
Xaiv AISI 4140 (los yog sib npaug) Yog tias:
- Txoj kab uas hla yog me me / nruab nrab:Koj txoj kab uas hla yog qis dua 100mm (4 nti).
- Load yog Steady:Ib feem tsis raug cuam tshuam loj heev.
- Tus nqi yog qhov tseem ceeb:Koj xav tau kev ntseeg siab, tus qauvtensile hlauuas yog dav muaj thiab pheej yig.
- Yam Yam Khoom:Axles, conveyor pins, me me zog, hydraulic rods, twj tso kua mis shafts.
Xaiv AISI 4340 Yog tias:
- Txoj kab uas hla yog Loj: Your shaft is thick (>100mm), thiab koj xav tau lub zog tseem ceeb.
- Kev nyab xeeb yog qhov tseem ceeb:Kev ua tsis tiav tsis yog ib qho kev xaiv (xws li aerospace, helicopter rotors, crankshafts).
- Shock Loads:Cov khoom siv ntsib kev tsim txom hnyav (piv txwv li, mining crushers, pawg tsav tsheb).
- Yam Yam Khoom:Lub dav hlau tsaws iav, hnyav- lub luag haujlwm tsheb axles, lub zog loj kis tau tus mob.
Kev sib txuas European: 42CrMo4 vs 34CrNiMo6
Yog hais tias koj yog deling nrog cov duab kos los ntawm Tebchaws Europe lossis thoob ntiaj teb cov qauv ISO, koj yuav tsis pom "4140" lossis "4340." Hloov chaw, koj yuav pom lawvAISI 4140 sib npaugqib.
Kev sib ntaus sib tua ntawm42CrMo4 vs 34CrNiMo6yeej yog tib zaj dab neeg:
- 42CrMo4 (1.7225):Qhov no yog qhov ncaj qha European sib npaug rau4140. Nws yog tus qauv engineering steel hauv lub teb chaws Yelemees thiab Fabkis.
- 34CrNiMo6 (1.6582):Qhov no yog European sib npaug rau4340. Nws yog qhov mus- rau qib rau hnyav- ntu ntu hauv EU.
Cov lus qhia Pro rau cov neeg yuav khoom:Thaum nrhiav AISI 4140 sib npaughauv Suav teb, txheeb xyuas tus qauv. Promisteel muab ob qho tib si ASTM (USA) thiab EN (Europe) cov qauv nrog ob daim ntawv pov thawj yog qhov ua tau.
Kev Lag Luam Kev Muaj Peev Xwm: Puas yog Kev Txhim Kho Tsim Nyog?
Wb tham txog nyiaj. NicKel yog ib qho ntawm cov hlau tsis zoo thiab kim tshaj plaws ntawm LME (London Hlau Txauv). Vim tias 4340 muaj ~ 1.8% Nickel, nws tseem kim dua 4140.
Nqe Index:
- 4140:100 (Base)
- 4340:160 - 180 (kwv yees)
Kev txiav txim siab Matrix:Yog tias koj tab tom ua 50mm txoj kab uas hla rau lub twj tso kua dej txheem, kev hloov kho mus rau 4340 yog ib qhonkim nyiaj. 4140 yuav ua txoj haujlwm zoo kawg nkaus. Txawm li cas los xij, yog tias koj ua haujlwm 300mm lub ntsiab ncej rau lub tshuab cua tshuab, txuag nyiaj los ntawm kev siv 4140 tuaj yeem ua rau catas.trophic core tsis ua haujlwm. Hauv qhov no, 4340 yog tuspheej yig tshaj kev tuav pov hwmkoj tuaj yeem yuav.
Xaus
Hauv4140v 4340showdown, tsis muaj "zoo dua" steel -tsuas yog cov hlau zoo rau txoj haujlwm.
- 4140yog tus ua haujlwm ntau yam rau me me - mus rau - nruab nrab qhov nruab nrab thiab davsteel rau shafts. Nws muab qhov zoo tshaj plaws sib npaug ntawm lub zog thiab tus nqi.
- 4340yog tus lifter hnyav. Thaum qhov loj me, lossis qhov cuam tshuam loj heev, nws cov ntsiab lus Nickel ua kom lub zog sib sib zog nqus thiab tsis sib haum xeeb.
Ntawm Promisteel, peb npaj ob qho tib si. Txawm koj xav tau tus qauv4140/42CrMo4 los yog hnyav- lub luag haujlwm4340/34CrNiMo6, peb muab Quenched & Tempered (Q + T) tuav npaj rau machining.
Tseem tsis paub tias yuav xaiv qib twg?
Hu rau Promisteel Hnub no.
Peb cov kws tshawb fawb metallurgists tuaj yeem tshuaj xyuas koj cov duab kos thiab pom zoo tus nqi tshaj - zootensile hlaurau koj daim ntawv thov.
