EN 10297-1 20NiCrMo2-2 yog dab tsi?
20NiCrMo2-2, steel tooj 1.6523, yog npib tsib xee-chromium-molybdenum rooj plaub- cov hlau hnyav muab los ua seamless raj raws li EN 10297-1. Lub npe hu ua raws li European rooj plaub-hardening steel convention: tus thawj daim duab muab cov nominal carbon ntsiab lus nyob rau hauv pua pua ntawm ib feem pua, ua raws li los ntawm cov alloying ntsiab thiab lawv nominal ntsiab lus.
Cov raj ua los ntawm cov qib no yog siv rau qhov nyuaj, hnav-cov khoom tiv taus yuav tsum tau ua ke nrog cov tawv tawv, poob siab- cov tub ntxhais tiv taus. Cov ntsiab lus tsis tshua muaj cov pa roj carbon monoxide khaws cov tub ntxhais txuas tom qab quenching, thaum cov nickel, chromium thiab molybdenum ntxiv muab cov hardenability xav tau rau cov ntaub ntawv carburised los txhim kho qhov tob ntawm hardness.
Chemical Composition thiab Alloy Design
| Element | Cov ntsiab lus % | Kev pab |
|---|---|---|
| Cov pa roj carbon | 0.17-0.23 Nws | Core zog tom qab hardening, rooj teb |
| Silicon | 0.40 max | Deoxidation |
| Manganese | 0.60-0.90 Nws | Hardenability, sulfur tswj |
| Phosphorus | 0.025 max | Residual, capped rau toughness |
| Sulfur | 0.035 max, qis dua rau kev txhim kho qib | Residual, tswj rau machinability tshuav |
| Chromium | 0.40-0.60 Nws | Hardenability thiab cov ntaub ntawv carburising teb |
| Nickel | 0.40-0.70 Nws | Toughness, tshwj xeeb tshaj yog nyob rau hauv qis kub |
| Molybdenum | 0.15-0.25 Nws | Resistance rau temper embrittlement |
Cov muaj pes tsawg leeg yog txhob txwm sib npaug ntau dua li alloyed heev. Nickel txhim kho qhov qis-kub toughness ntawm lub hauv paus, chromium thiab manganese tsim lub hardenability yuav tsum tau rau rooj plaub, thiab molybdenum suppresses temper embrittlement thaum lub tempering kauj ruam uas ua raws li quenching. Cov khoom seem tau tuav qis kom lub raj tseem huv thiab kwv yees hauv kev pabcuam.
Mechanical Properties thiab Hardness
Cov khoom yog nyob ntawm txoj kev kho cua sov thiab ntawm phab ntsa tuab ntawm lub raj, vim tias hardenability yog txwv los ntawm ntu loj. Ob qho xwm txheej uas ib txwm hais yog qhov ua rau lub cev tsis muaj zog lossis annealed tus me nyuam, nyob rau hauv uas lub raj yog mos thiab yooj yim machined, thiab quenched thiab tempered mob, nyob rau hauv uas lub raj mus txog nws lub zog ua hauj lwm.
| Qhov xwm txheej | Tej yam tshwm sim |
|---|---|
| Mos annealed lossis normalized tus me nyuam mob | Machinable qauv rau kev sib sau, tig thiab txiav |
| Quenched thiab tempered | High tensile thiab pov thawj lub zog nrog zoo notch toughness |
| Carburised thiab hardened rooj plaub | Case hardness nyob rau hauv cheeb tsam ntawm 58 mus rau 62 HRC nrog ib tug tswj qhov tob |
| Core tom qab carburizing thiab hardening | Cov tub ntxhais tawv tawv, hardness nyob ntawm ntu loj thiab hardenability |
Vim tias hardenability yog nruab nrab, qhov ua tau zoo ntawm cov tub ntxhais hardness ntog raws li phab ntsa thickness nce, thiab cov khoom yog li ntawd tau teev tawm tsam phab ntsa thickness band es tsis yog ib daim duab. Qhov twg tus qauv tsim nyob ntawm qhov tseem ceeb ntawm lub zog, lub raj phab ntsa thiab qhov quench qhov hnyav yuav tsum tau sib phim rau qhov hardenability ntawm cov hlau. Qhov twg tus qauv siv los ntawm kev hnav tsis kam, rooj plaub qhov tob thiab cov ntaub ntawv hardness yog qhov kev tswj hwm qhov tseem ceeb, thiab cov no tau pom zoo nrog tus kws kho cua sov rau lub raj tshwj xeeb.
Thaum tshav kub kub kho Cycle
Austenitising nyob rau hauv thaj tsam ntawm 830 txog 860 degrees Celsius, ua raws li cov roj quenching los hloov cov qauv rau martensite.
Tempering nyob rau hauv thaj tsam ntawm 550 txog 600 degrees Celsius kom sib npaug zog thiab toughness. Nce lub tempering kub nce toughness thiab txo lub zog.
Kev xaiv rooj plaub tawv tawv los ntawm carburising nyob rau hauv thaj tsam ntawm 900 txog 930 degrees Celsius ua raws li quenching, los tsim cov ntaub ntawv nyuaj dhau ntawm cov tub ntxhais tawv.
Tsis txias txias los ntawm temper embrittlement ntau yam tom qab tempering, kom khaws cia notch toughness.
Cov qauv tempered yog tempered martensite nrog finely dispersed alloy carbides. Kev tswj ntawm austenitising kub thiab lub sij hawm yog ib qho tseem ceeb vim hais tias ib qho tsis tsim nyog coarse ua ntej austenite grain loj txo toughness nyob rau hauv tiav ib feem.
Tej kev siv
Aerospace shafting thiab structural tubular Cheebtsam raug rau qaug zog loading
Automotive drivetrain qhov chaw xws li iav shafts thiab siab kev ntxhov siab rotating Cheebtsam
Cov khoom siv hluav taws xob hauv kev lag luam yuav tsum muaj zog ntawm sub-zero ambient kub
Tshuab cuab tam spindles, tes tsho thiab bushes xav tau ib tug nyuaj hnav nto
Hydraulic thiab pneumatic actuator Cheebtsam qhov twg yuav tsum tau ib tug nyuaj bore los yog pas nrig nto
General precision mechanical qhov chaw uas tsim los ntawm cov tube Tshuag ntawm cov tshuab tsis siv neeg
Kev kuaj thiab Traceability
Kev tshuaj xyuas ntawm EN 10297-1 lub raj feem ntau suav nrog kev txheeb xyuas qhov ntev ntawm sab nraud txoj kab uas hla thiab phab ntsa tuab, tshuaj ntsuam xyuas ib ntus, ntsuas tensile ib pawg, thiab kuaj qhov tawv nqaij qhov twg qhov kev txiav txim xav tau. Ultrasonic kuaj yog siv rau sab hauv soundness thiab sib nqus particle los yog dye penetrant tshuaj xyuas rau defects ntawm lub raj npaj rau qaug zog-tseem ceeb Cheebtsam.
Kev kuaj xyuas hlau yuav suav nrog kev txiav txim siab ua ntej austenite grain loj thiab tsis yog -kev ntsuas kev ntsuas hlau thaum daim ntawv thov xav tau cov hlau huv. Cov ntaub ntawv pov thawj yog muab rau qib soj ntsuam pom zoo nyob rau hauv qhov kev txiav txim, nrog rau tag nrho traceability los ntawm cov cam khwb cia tooj mus rau lub tiav tube, thiab tej yam uas yuav tsum tau ntxiv xws li ib tug tshwj xeeb nto tiav los yog kawg npaj tau teev nyob rau hauv lub purchase specification.
FAQ
Q: Lub npe 20NiCrMo2-2 txhais li cas?
Tus thawj daim duab 20 qhia txog kwv yees li 0.20 feem pua carbon, cov ntawv txheeb cov npib tsib xee, chromium thiab molybdenum raws li cov ntsiab lus alloying, thiab cov ntaub ntawv kawg qhia lawv cov ntsiab lus nominal, muab steel tooj 1.6523.
Q: Puas yog qib no txhais tau tias rau qhov tawv tawv los yog los ntawm kev tawv tawv?
Nws yog rooj plaub- steel hlau. Cov Cheebtsam feem ntau yog carburised thiab hardened kom tau ib qho nyuaj, hnav -resistant nto tshaj ib tug tawv core, txawm hais tias lub raj kuj yuav quenched thiab tempered rau los ntawm lub zog.
Q: Cas cov ntaub ntawv hardness tuaj yeem xav tau?
Cov ntaub ntawv raug carburised thiab hardened feem ntau ncav cuag thaj tsam ntawm 58 txog 62 HRC, thaum lub zog tseem ceeb nyob ntawm phab ntsa thickness thiab hardenability ntawm cov hlau.
Q: Vim li cas molybdenum suav nrog hauv cov khoom sib xyaw?
Molybdenum txhim kho hardenability thiab, qhov tseem ceeb tshaj, tiv taus temper embrittlement kom tsis txhob muaj qhov toughness yog khaws cia tom qab tempering.
Q: Dab tsi yog qhov kev pom zoo ntawm kev kho cua sov kub ntau?
Austenitising yog ua nyob ib ncig ntawm 830 mus rau 860 degrees Celsius ua raws li cov roj quenching, nrog tempering nyob rau hauv lub cheeb tsam ntawm 550 mus rau 600 degrees Celsius, thiab carburising nyob ib ncig ntawm 900 mus rau 930 degrees Celsius thaum cov ntaub ntawv hardening yuav tsum tau.
Q: Lub raj tshuaj ntsuam xyuas li cas?
Kev tshuaj xyuas suav nrog kev kuaj xyuas qhov ntev, tshuaj ntsuam xyuas, ntsuas tensile thiab kuaj hardness, ntxiv los ntawm kev kuaj xyuas ultrasonic thiab qhov chaw tsis zoo rau kev qaug zog- daim ntawv thov tseem ceeb, tag nrho nrog kev taug qab mus rau tus lej cam khwb cia.
