4140 Steel yog dab tsi
4140 steel yog chromium-molybdenum alloy steel paub txog kev sib xyaw ua ke ntawm lub zog siab, zoo toughness thiab hnav tsis kam tom qab kev kho cua sov. Nws zaum hauv nruab nrab-carbon alloy tsev neeg: cov ntsiab lus carbon ntawm li 0.40% tso cai rau nws kom hardened los ntawm quenching, thaum chromium thiab molybdenum muab hardenability kom tuab seem tuaj yeem dhau los ntawm -hardened es tsis yog rooj plaub- hardened. Nws yog muab nkag rau feem ntau nyob rau hauv lub quenched thiab tempered mob rau qhov chaw xws li lub zog, ncej, axles, bolts, couplings thiab machinery Cheebtsam uas yuav tsum tau nqa load thiab tiv taus hnav tib lub sij hawm.
Vim tias nws yog cov hlau alloy ntau dua li cov yeeb nkab tshwj xeeb, 4140 feem ntau tau teev tseg raws li bar, forging lossis hnyav - cov khoom siv phab ntsa raws li cov qauv xws li ASTM A29 thiab ASTM A322 rau cov hlau tuav, lossis qib sib npaug hauv tebchaws xws li 42CrMo4 raws li EN 10083-3 lossis 42TCrMo hauv qab
Chemical Composition thiab Designations
| Element | Hom ntau yam (AISI / SAE 4140) | Muaj nuj nqi |
|---|---|---|
| Cov pa roj carbon | 0.38-0.43% | Muab cov lus teb hardening thiab ua tiav hardness tom qab quenching |
| Manganese | 0.75-1.00% | Txhim kho hardenability thiab tswj sulfur-txog kub luv |
| Silicon | 0.15-0.35% | Deoxidation thiab kev daws teeb meem ntxiv dag zog |
| Chromium | 0.80-1.10% | Hardenability, hnav tsis kam thiab me me oxidation kuj |
| Molybdenum | 0.15-0.25% | Ncua kub hnyiab thiab ua kom siab siab - qhov kub thiab txias |
| Phosphorus / sulfur | 0.035% max / 0.040% max | Cov khoom seem khaws cia qis rau toughness |
| Hlau | Tshuav | Base hlau |
Cov qauv sib npaug tau siv dav thoob plaws cov khoom siv: UNS G41400 hauv Tebchaws Meskas, 1.7225 / 42CrMo4 hauv Tebchaws Europe thiab 42CrMo hauv Suav teb. Cov muaj pes tsawg leeg sib txawv me ntsis ntawm cov qauv, yog li tus neeg yuav khoom yuav tsum ib txwm hais txog kev tswj hwm kev qhia tshwj xeeb thiab, qhov twg nws tseem ceeb, qhov yuav tsum tau muaj zog hardenability band es tsis yog lub npe lag luam nrov xwb.
Kev kho cua sov thiab ua rau cov khoom siv kho tshuab
4140 ncav cuag cov khoom muaj txiaj ntsig tsuas yog tom qab kho cua sov kom raug. Txoj kev ib txwm yog austenitising nyob rau hauv thaj tsam ntawm 840-880 degree, roj quenching rau daim ntawv martensite, thiab tempering ntawm roughly 400℃thiab 650℃los pauv hardness tiv thaiv toughness. Tempering kub yog li lub ntsiab tsim qauv: lub siab tsis tshua muaj qhov hnyav, hnav-tiv taus nyob rau hauv thaj tsam 40 HRC thiab saum toj no, thaum lub siab kub ua rau lub zog tawv, muaj zog hauv cheeb tsam 25-35 HRC nrog lub zog tensile feem ntau nyob rau hauv 850-1,100 MPa band. Tshooj loj tseem ceeb ib yam nkaus, vim tias qhov txias txias los ntawm qhov nruab nrab ntawm qhov hnyav bar yog qeeb dua ntawm qhov chaw.
Normalization:refines grain qauv ua ntej hardening thiab txhim kho machinability ntawm lub raws li -muab bar.
Quenching:roj quenching yog tus qauv; polymer lossis dej quenching tsuas yog siv qhov chaw thiab geometry zam qhov txias dua tsis muaj kev cuam tshuam lossis tawg.
Tempering:npau taws tam sim tom qab quenching kom tsis txhob ncua kev tawg; tuav ntev txaus rau qhov nruab nrab ntawm ntu kom ncav cuag qhov kub thiab txias.
Kev ntxhov siab:thov tom qab rough machining nyob ze- cov khoom tiv thaiv kom tsis txhob muaj kev cuam tshuam thaum lub sijhawm ua tiav machining.
Nto hardening:induction los yog nitriding kev kho mob tuaj yeem ntxiv qhov hnav tsis kam thaum tuav cov tub ntxhais tawv.
Yuav ua li cas 4140 Sib piv nrog Cov Qib Siab Cov Hlau
Cov qib steel tsis nyob rau ntawm ib qho kev ntsuas, vim tias qib raug nyob ntawm lub luag haujlwm. Qhov qis tshaj -cov khoom siv yeeb nkab muaj zog yog cov qis- carbon steels xws li ASTM A53 Qib A lossis AISI 1018, nrog cov ntsiab lus carbon hauv 0.15-0.25% ntau; lawv muaj cov txiaj ntsig me me thiab lub zog tensile, uas haum rau qis - cov kav dej siab, laj kab thiab cov khoom siv dav dav tab sis tsis yog cov tshuab ua haujlwm siab.
| Qib | Qeb | Hom luag haujlwm |
|---|---|---|
| AISI 1018 / ASTM A53 Qib A | Tsawg- carbon steel | General fabrication, qis- cov yeeb nkab siab, cov hlua thiab cov ncej uas tsis muaj kev ntxhov siab heev |
| ASTM A36 | Cov qauv carbon steel | Kev tsim kho dav dav, thav duab thiab lub hauv paus phaj |
| ASTM A106 Qib B | Carbon steel yeeb nkab | High -kub thiab siab yeeb nkab kev pabcuam |
| API 5L X70 | Siab -strength kab yeeb nkab | Roj thiab roj xa mus kav |
| 4140/42CrMo4 | Chromium{0}}molybdenum alloy hlau | Quenched thiab tempered shafts, zog, bolts thiab machinery qhov chaw |
| D2 | Cov cuab yeej steel | Txiav thiab tsim cov cuab yeej yuav tsum tau hnav tsis kam |
| 304/316 stainless hlau | Austenitic stainless hlau | Corrosion{0}}cov kev pabcuam tiv taus; 316 rau chloride -cov kabmob ib puag ncig |
| ASTM A335 P91 | 9Cr-1Mo-V alloy hlau | Siab -kub lub ntsiab chav yeeb nkab hauv cov chaw tsim hluav taws xob |
Hlau nws tus kheej feem ntau yog muab faib ua peb pawg: carbon steel, qhov twg cov khoom los ntawm carbon thiab manganese; hlau alloy, qhov twg chromium, molybdenum, nickel los yog vanadium ntxiv rau hardenability los yog siab - kub lub zog; thiab stainless hlau, qhov twg chromium cov ntsiab lus ntawm tsawg kawg yog 10.5% muab ib tug passive nto zaj duab xis thiab yog li ntawd corrosion kuj.
Machinability, Weldability thiab Fabrication Notes
Nyob rau hauv lub annealed los yog normalized mob 4140 tshuab tsim nyog zoo, thiab nws machinability txhim kho ntxiv tom qab normalising. Nyob rau hauv lub hardened thiab tempered mob nws yog markedly nyuaj rau tooling, yog li ntxhib machining yog npaj ua ntej qhov kawg thaum tshav kub kub kev kho mob thiab tsuas yog tiav txiav tom qab ntawd. Vuam yog ua tau tab sis yuav tsum tau saib xyuas: preheat ntawm kwv yees li 200-300℃nyob ntawm thickness, tswj interpass kub, low-hydrogen consumables thiab post-weld heat treatment yog ib txwm yuav tsum tau kom tsis txhob muaj ib qho nyuaj, tawg-tseem ceeb tshav kub. Qhov twg vuam tsis tuaj yeem zam tau ntawm qhov tawv tawv, qhov chaw softening thiab residual stress redistribution yuav tsum tau txiav txim siab nyob rau hauv kev tsim ntawm kev sib koom tes.
Daim Ntawv Thov thiab Kev Taw Qhia Kev Xaiv
4140 raug xaiv thaum ib feem yuav tsum nqa cov khoom tseem ceeb, tiv taus hnav thiab raug tsim nyob rau hauv ib ntu tuab txaus kom tau txais txiaj ntsig los ntawm nws qhov sib sib zog nqus hardenability. Cov neeg siv khoom yog cov tshuab, tsheb, roj thiab roj thiab cov khoom siv hnyav rau cov khoom lag luam xws li cov ncej tsav, cov iav khoob, hydraulic rods, coupling lub cev thiab siab - lub zog fasteners. Nws tsis yog cov lus teb zoo rau kev siv tshuaj tiv thaiv corrosion, qhov twg austenitic stainless qib yog qhov tsim nyog, lossis rau loj - txoj kab uas hla qis- cov yeeb nkab siab, qhov twg cov pa roj carbon steel yeeb nkab specification xws li ASTM A53 Qib B lossis ASTM A106 Qib B yog kev lag luam ntau dua.
Cov lus nug nquag
Q: 4140 steel yog dab tsi?
4140 steel yog chromium-molybdenum alloy steel uas muaj li ntawm 0.40% carbon, 0.8-1.1% chromium thiab 0.15-0.25% molybdenum. Nws yog quenched thiab tempered rau siab zog, toughness thiab hnav kuj nyob rau hauv lub zog, shafts thiab machinery qhov chaw.
Q: Dab tsi yog hom tsis muaj zog steel yeeb nkab?
Tsawg- carbon yeeb nkab qib xws li ASTM A53 Qib A, thiab qis- carbon bar steels xws li AISI 1018, muaj qhov qis tshaj tawm thiab lub zog tensile vim tias lawv cov ntsiab lus carbon tsuas yog kwv yees li 0.15-0.25%. Lawv haum rau qis- cov kav dej siab thiab kev tsim khoom dav dav es tsis yog lub luag haujlwm siab.
Q: Cov qib steel twg yog qhov zoo tshaj plaws rau daim ntawv thov?
Tsis muaj universally zoo qib. Siab - siab thiab siab - qhov kub ntawm cov yeeb nkab kev pab cuam nyiam ASTM A106 Qib B lossis cov qib alloy xws li ASTM A335 P91, corrosion-cov kev pabcuam tiv taus nyiam 304 lossis 316 stainless hlau, thiab kev tsim kho dav dav nyiam ASTM A36 lossis ASTM A53 Qib B.
Q: Yuav ua li cas yog 4140 steel hardened?
Nws yog austenitised ntawm roughly 840-880 degree, roj quenched thiab ces tempered ntawm li 400℃thiab 650 degree. Lub tempering kub teem qhov kawg sib npaug ntawm hardness thiab toughness.
Q: Puas yog 4140 steel weldable?
Yog lawm, tab sis nrog kev ceev faj: preheat nyob rau hauv 200-300℃ntau yam nyob ntawm thickness, tswj interpass kub, qis-hydrogen consumables thiab post-weld tshav kub kev kho mob kom tsis txhob tawg nyob rau hauv lub tshav kub-tshem tawm tsam.
Q: Puas yog 4140 steel corrosion resistant?
Tsuas yog marginally. Chromium cov ntsiab lus ntawm li 0.8-1.1% yog qis dua qhov kwv yees li 10.5% xav tau rau ib zaj duab xis passive, yog li 4140 yuav tsum tau plating, txheej los yog hloov mus rau stainless hlau hauv kev pabcuam corrosive.
Q: Peb qib dav hlau yog dab tsi?
Carbon steel, qhov twg cov khoom yog los ntawm carbon thiab manganese; alloy hlau, qhov twg chromium, molybdenum, nickel lossis vanadium ntxiv; thiab stainless hlau, qhov tsawg kawg yog 10.5% chromium muab corrosion kuj.
