45 steel yog carbon structural steel nrog cov ntsiab lus carbon ntawm 0.45 feem pua . Nws yog tus cwj pwm los ntawm tus nqi qis, zoo machining kev ua tau zoo, siab hardness tom qab quenching, zoo toughness thiab qee yam hnav tsis kam tom qab quenching thiab tempering. Nws yog dav siv nyob rau hauv kev tsim khoom ntawm cov khoom siv thiab cov yas qis qis.
Cia peb saib ntawm 45 steel.
"45 steel" yog ib lub npe nrov, thiab cov cim feem ntau sau ua "45 #". Qhov tseeb, GB tus qauv hlau tus lej yog "45", uas tsis yog tus lej sib txuas, thiab nws tsis yog qhov tseeb heev los nyeem "45 steel".
Cov qib zoo sib xws ntawm 45 steel yog S45C (JIS) thiab 1045 (AISI). Tsis tas li ntawd, qib SM45 hauv kuv lub teb chaws cov txheej txheem metallurgical kev qhia tshwj xeeb qhia txog kev siv cov pwm yas. Piv nrog 45 steel, SM45 muaj qis phosphorus thiab sulfur cov ntsiab lus thiab zoo dua steel purity.
>>Cov khoom xyaw Specifications
Txuj | GB/T 699 | Qib | 45 |
C | 0.42~0.50 | Cr | Tsawg dua lossis sib npaug rau 0.25 |
Si | 0.17~0.37 | Ni | Tsawg dua lossis sib npaug rau 0.30 |
Mn | 0.50~0.80 | Cu | Tsawg dua lossis sib npaug rau 0.25 |
Classified los ntawm phosphorus thiab sulfur | P | S | |
45 | Tsawg dua lossis sib npaug rau 0.035 | Tsawg dua lossis sib npaug rau 0.035 | |
45A | Tsawg dua lossis sib npaug rau 0.030 | Tsawg dua lossis sib npaug rau 0.030 | |
45E | Tsawg dua lossis sib npaug rau 0.025 | Tsawg dua lossis sib npaug rau 0.020 | |
Txuj | TIAB SA 094 | AISI | JIS G4051 |
Qib | SIB 45 | 1045 | S45C |
C | 0.42~0.48 | 0.43~0.50 | 0.42~0.48 |
Si | 0.17~0.37 | — | 0.15~0.35 |
Mn | 0.50~0.80 | 0.60~0.90 | 0.60~0.90 |
P | Tsawg dua lossis sib npaug rau 0.030 | Tsawg dua lossis sib npaug rau 0.030 | Tsawg dua lossis sib npaug rau 0.030 |
S | Tsawg dua lossis sib npaug rau 0.030 | Tsawg dua lossis sib npaug rau 0.050 | Tsawg dua lossis sib npaug rau 0.035 |
>>mechanical khoom (GB/T 699-1999)
Sample dawb paug dimension (mm) | 25 | |
Pom zoo kho cua sov (degree) | normalizing | 850 |
quenching | 840 | |
tempering | 600 | |
Mechanical zog | tensile zog MPa | Ntau dua lossis sib npaug li 600 |
Yield zog MPa | Ntau dua lossis sib npaug rau 355 | |
Elongation feem pua | Ntau dua lossis sib npaug li 16 | |
txo ntawm thaj tsam feem pua | Ntau dua lossis sib npaug li 40 | |
Impact zog J | Ntau dua lossis sib npaug li 39 | |
HBS | tsis kub-kho steel | Tsawg dua lossis sib npaug li 229 |
annealed hlau | Tsawg dua lossis sib npaug li 197 |
Lus Cim: Rau cov hlau loj dua 80mm, qhov elongation tom qab tawg thiab qhov txo qis hauv cheeb tsam raug tso cai kom txo qis los ntawm 2 feem pua thiab 5 feem pua ntawm qhov piv nrog cov lus saum toj no.
>>Kev kho cua sov thiab hardness
Pom zoo quenching txheej txheem specification: quenching kub yog 820 ~ 860 degree, dej txias los yog roj txias, hardness Ntau tshaj los yog sib npaug rau 50HRC.
Pom zoo tempering txheej txheem specification: tempering kub yog 500 ~ 560 degree, cua txias, hardness yog 25 ~ 33HRC.
Tempering nyob rau hauv qhov ntsuas kub no yog quenching thiab tempering. quenching thiab tempering ua rau lub zog, plasticity thiab toughness ntawm 45 steel tau ib tug zoo tshuav nyiaj li cas, cov kev ua tau zoo yog zoo, thiab nws muaj peev xwm hloov mus rau alternating load ib puag ncig.
Qhov saum npoo hardness ntawm 45 steel tom qab quenching thiab tempering yog tsawg, thiab nws tsis hnav-resistant. Yog li ntawd, quenching thiab tempering ntxiv rau saum npoo quenching feem ntau yog siv los txhim kho qhov nyuaj ntawm qhov chaw.
Kev sib raug zoo ntawm tempering kub thiab hardness yog qhia nyob rau hauv cov lus hauv qab no:
tempering kub | Tom qab quenching | (degree) | |||||
200 | 300 | 400 | 500 | 550 | 600 | ||
Hardness HRC | 57 | 55 | 50 | 41 | 33 | 26 | 22 |
Lus Cim: ① Quenching yog dej quenching ntawm 840 degree. ② 45 steel tsim nyog yog tias qhov hardness ntau dua HRC55 (txog HRC62) tom qab quenching thiab ua ntej tempering. Qhov siab tshaj plaws hardness hauv daim ntawv thov yog HRC55 (induction quenching HRC58).