Chaw muag khoom ntawm 40Cr steel yeeb nkab rau kev ua
40Cr steel yeeb nkab yog ib hom hlau puag ncig nrog hollow seem thiab tsis muaj pob qij txha nyob ib puag ncig. Nws yog ua los ntawm cov yeeb nkab tsis muaj khoob los ntawm perforation, thiab tom qab ntawd ua los ntawm kub dov, txias dov los yog txias txias. Piv nrog rau cov hlau puag ncig thiab lwm yam steel hlau, thaum lub zog khoov thiab torsional yog tib yam, qhov hnyav ntawm cov yeeb nkab steel yog sib dua, uas yog ib hom kev lag luam steel.
Raws li GB / T 3077-2008: tshuaj muaj pes tsawg leeg (mas feem,%) C 0.37 ~ 0.44, Si 0.17 ~ 0.37, Mn 0.50 ~ 0.80, cr0.80 ~ 1.10, Ni ≤ 0.30 【Mechanical zog]
Sample blank size (mm): 25
Cov cua kub ntawm thawj quenching (℃): 850; Coolant: Roj
Qhov thib ob quenching cua sov kub (℃): -
Tempering cua sov (℃): 520; Coolant: dej, roj
Tensile zog (σ b / MPa): ≧980
Yield point (σ s / MPa): ≧785
Elongation tom qab tawg (δ 5/%): ≧9
Txo thaj tsam (ψ/%): ≧45
Kev cuam tshuam lub zog nqus (aku2 / J): ≥ 47
Brinell hardness (hbs100 / 3000) (annealed lossis kub tempered): ≤ 207
Tus qauv steel qib GB hauv Suav teb yog 40Cr, DIN cov khoom No. / ASTM Standard Steel No. 5140, Japanese JIS standard steel No. scr440 (H) / scr440, American AISI / SAE / ASTM Standard Steel No. 5140, thoob ntiaj teb lub koom haum rau Standardization ISO standard steel No. 41Cr4.
(kwv yees) ACM = 780 ℃
Kub 850 ~ 870 ℃, hardness 179 ~ 229hbs.
Qhov ntsuas kub yog 740 ~ 760 ℃, lub sijhawm tuav yog 4 ~ 6h, thiab tom qab ntawd qhov kub thiab txias yog ≤ 600 ℃ ntawm qhov cua txias ntawm 5 ~ 10 ℃ / h.
Hardness ua ntej kho ≤ 217hbs, hardness tom qab softening ≤ 163hbs.
(670 ± 10) ℃ × 2H, kub nce nrog rau qhov cub, (710 ± 10) ℃ × 2H, txias nrog lub cub tawg, (670 ± 10) ℃ × 2H, kub nce nrog lub cub tawg, (710 ± 10) ℃ × 2H, tom qab ntawd txo qhov kub ntawm qhov cub, (670 ± 10) ℃ × 2H, kub nce nrog lub cub tawg, (710 ± 10) ℃ × 2H, txias nrog lub cub tawg rau 3 lub voj voog, thiab tom qab ntawd txias mus rau 550 ℃ rau cua txias. Hardness tom qab kho yog 153hbs.
quenching kub 850 ℃ ± 10 ℃, roj txias; Tempering kub 520 ℃ ± 10 ℃, dej, roj thiab cua txias.
Nruab nrab carbon modulated steel, txias taub hau tuag steel. Cov hlau muaj tus nqi nruab nrab thiab kev ua haujlwm yooj yim. Tom qab kev kho cua sov tsim nyog, nws tuaj yeem tau txais qee qhov toughness, plasticity thiab hnav tsis kam. Normalizing tuaj yeem txhawb cov ntaub so ntswg spheroidization thiab txhim kho qhov kev ua tau zoo ntawm cov blanks nrog hardness tsawg dua 160hbs. Tempered ntawm 550 ~ 570 ℃, cov hlau muaj cov khoom siv zoo tshaj plaws. Lub hardenability ntawm cov hlau no yog siab dua li ntawm 45 steel. Nws yog tsim rau kev kho deg hardening xws li siab zaus quenching thiab nplaim quenching.
Tom qab quenching thiab tempering, cov hlau no yog siv los tsim cov khoom siv hluav taws xob uas muaj qhov nruab nrab ntawm qhov nruab nrab thiab nruab nrab ceev, xws li lub kauj khawm, lub nraub qaum ib nrab ntawm lub tsheb, iav, ncej, cua nab, spline ncej, lub tes tsho hauv nruab nrab, thiab lwm yam ntawm lub tshuab cuab yeej; Tom qab quenching thiab nruab nrab kub tempering, nws yog siv los tsim cov khoom bearing siab load, cuam tshuam thiab nruab nrab ceev, xws li iav, lub ntsiab ncej, roj twj rotor, zawv zawg thaiv, dab tshos, thiab lwm yam; Tom qab quenching thiab low-temperature tempering, nws yog siv los tsim cov khoom nrog hnyav load, tsis tshua muaj kev cuam tshuam, hnav tsis kam thiab khoom thickness tsawg dua 25mm ntawm seem, xws li cab, lub ntsiab ncej, ncej, dab tshos, thiab lwm yam; Tom qab quenching thiab tempering thiab high-frequency nto quenching, nws yog siv los tsim cov khoom uas muaj qhov tawv tawv thiab hnav tsis kam, xws li iav, tes tsho, ncej, lub ntsiab ncej, crankshaft, spindle, pin, txuas pas nrig, ntsia hlau, txiv ntseej, inlet valve, thiab lwm yam. Tsis tas li ntawd, cov hlau no tseem tsim nyog rau kev tsim ntau yam kis tau tus mob uas tau kho los ntawm carbonitriding, xws li lub zog thiab cov ncej nrog txoj kab uas hla loj thiab zoo kub tsis tshua muaj zog.
Annealed, hardness ≤ 207hbs. 40Cr elastic modulus: elastic modulus E (20 ℃) / MPA 200000 ~ 211700, shear modulus G (20 ℃) 80800
Quenching txheej txheem ntawm 40Cr
40Cr quenching, 850 ℃, roj txias; Tempering 520 ℃, dej txias, roj txias. Qhov saum npoo quenching hardness ntawm 40Cr steel yeeb nkab yog hrc52-60, thiab nplaim quenching tuaj yeem ncav cuag hrc48-55.
40Cr nitriding kev kho mob
40Cr belongs rau nitrided steel, thiab nws cov ntsiab yog haum rau nitriding. 40Cr tuaj yeem tau txais qhov tawv tawv dua tom qab kev kho nitriding, thiab qhov nyuaj tshaj plaws tom qab kev kho nitriding tuaj yeem ncav cuag hra72 ~ 78, piv txwv li hrc43 ~ 55. Nitriding workpiece txheej txheem txoj kev: forging annealing ntxhib machining quenching thiab tempering tiav machining kev ntxhov siab tshem tawm ntxhib sib tsoo nitriding tiav kev sib tsoo lossis sib tsoo. Vim tias cov txheej txheej nitrided yog nyias thiab nkig, nws yuav tsum muaj cov qauv ntawm cov tub ntxhais muaj zog, yog li nws yuav tsum tau nqa tawm quenching thiab tempering kho cua sov ua ntej kom tau txais tempered sorbite thiab txhim kho cov khoom siv ntawm cov tub ntxhais thiab cov khoom zoo. txheej nitrided. Mos nitriding yog nquag siv nitriding, thiab roj nitriding feem ntau yog siv
40Cr vuam
Ua ntej 40Cr vuam, xyuam xim rau preheating los tiv thaiv quench tawg hauv lub vuam vim matrix kub dissipation. Nws yog qhov zoo tshaj rau normalize ua ntej welding.
Weldability ntawm 40Cr: nws yog ib qho yooj yim rau cais thaum lub sij hawm crystallization thiab rhiab heev rau crystallization tawg (ib hom thermal tawg). Nws yog ib qho yooj yim rau tawg nyob rau hauv lub crater thiab concave ib feem nyob rau hauv lub vuam thaum vuam. Nrog cov ntsiab lus siab carbon, nws yog ib qho yooj yim kom tau cov qauv hardened (martensite) uas yog rhiab heev rau cov kab nrib pleb thaum lub sij hawm txias ceev. Thaum cov cua txias ntawm cheeb tsam superheated loj, nws yog ib qho yooj yim los tsim ib qho nyuaj thiab nkig siab carbon martensite thiab embrittle cheeb tsam superheated.
1. Vuam feem ntau yog ua nyob rau hauv lub xeev annealed (normalized).
2. Txoj kev vuam tsis txwv
3.Qhov kub preheating tuaj yeem tsim nyog ntxiv nrog lub zog loj linear. Feem ntau, lub preheating kub thiab interlayer kub tuaj yeem tswj tau ntawm 250 ~ 300 ℃.
4. Cov khoom siv vuam yuav tsum xyuas kom meej tias cov khoom sib xyaw ntawm cov hlau tso tawm yog qhov zoo ib yam li cov hlau hauv paus, xws li j107-cr.
5.quenching thiab tempering tshav kub kev kho mob yuav tsum tau nqa tawm nyob rau hauv lub sij hawm tom qab welding. Yog tias nws nyuaj rau kev ua quenching thiab tempering kev kho mob nyob rau hauv lub sij hawm, intermediate annealing los yog tuav ntawm ib tug kub siab tshaj preheating rau ib lub sij hawm ntawm lub sij hawm yuav nqa tawm kom tshem tawm diffused hydrogen thiab soften tus qauv. Rau cov khoom uas muaj cov qauv complex thiab ntau welds, intermediate annealing yuav ua tau tom qab welding ib co xov tooj ntawm welds.
