40Cr structural steel yog ib qho ntawm cov qauv hlau uas muaj kev siv dav. Vim nws cov khoom siv zoo, 40Cr steel bar yog siv dav hauv kev tsim cov khoom tseem ceeb hardened thiab quenched mechanical qhov chaw, xws li iav ncej tes tsho, txuas pas nrig, ntsia hlau, inlet valve thiab pwm kev lag luam, xws li pwm thiab nruab nrab yas qhov chaw qauv xws li pwm ncej.
Tom qab quenching thiab quenching, 40Cr steel muaj cov cuab yeej zoo txhua yam, tsis muaj qhov kub thiab txias tsis kam thiab tsis tshua muaj siab. Tsuas yog quenching thiab tempering, 40Cr kuj haum rau siab zaus nitriding thiab quenching. Lub peev xwm hardening ntawm 40Cr steel yog qhov zoo, uas tuaj yeem ncav cuag 28 ~ 60mm hauv dej quenching thiab 15 ~ 40mm hauv roj quenching. Thaum 174 ~ 229HBS, tus txheeb ze machinability yog 60%.
Tshuaj muaj pes tsawg leeg:
Cov qauv | GB/T 3077 | ASTM A 322 Cov khoom siv | yog g4053 | TIAB SA 17200 |
Khoom siv | 40 Cr | 5 140 G51400 | SCR440 | 41Cr4/1.7035 |
ua | 0.37 ~ 0.44 hli | 0.38 ~ 0.43 hli | 0.38 ~ 0.43 hli | 0.38 ~ 0.45 hli |
Yog lawm | 0.17 ~ 0.37 hli | 0.15-0.35 Nws | 0.15-0.35 Nws | Tsawg dua lossis sib npaug li 0.40 |
Minnesota | 0.50 ~ 0.80 hli | 0.70 ~ 0.90 hli | 0.60 ~ 0.90 hli | 0.60 ~ 0.90 hli |
P | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.030 | Tsawg dua lossis sib npaug li 0.035 |
Yog lawm | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.040 | Tsawg dua lossis sib npaug li 0.030 | Tsawg dua lossis sib npaug li 0.030 |
Cr | 0.80 ~ 1.10 Nws | 0.70 ~ 0.90 hli | 0.90 ~ 1.20 Nws | 0.90 ~ 1.20 Nws |
Tsis yog | - | - | Tsawg dua lossis sib npaug li 0.25 | - |
Mechanical Property (GB/T 3077-1999):
Qauv loj (mm) | 25 | |
Kev kho cua sov ( | Cooling (roj txias) | 850 |
quenching (dej, roj quenching) | 520 | |
khoom ntiag tug | Tensile zog. MPa | Ntau dua lossis sib npaug li 980 |
Elasticity txwv. MPa | Ntau dua lossis sib npaug rau 785 | |
lengthening tom qab tawg. % | Ntau dua lossis sib npaug li 9 | |
txo thaj tsam. % | Ntau dua lossis sib npaug li 45 | |
Absorbs qhov cuam tshuam ntawm lub zog. J. | Ntau dua lossis sib npaug li 47 | |
Lub hardness ntawm kev xa khoom. H.B.S. | Annealed los yog siab tempered | Tsawg dua lossis sib npaug li 207 |
Qee zaum engineers feem ntau tsis meej pem nrog 40Cr thiab 42CrMo. Nws cov tshuaj lom neeg muaj pes tsawg leeg thiab lub cev muaj zog sib txawv . 42CrMo kuj yog cov qauv hlau alloy nrog 0.38-0.45% carbon, 0.9-1.2% chromium, 0.15-0.25% molybdenum, nrog lub zog tensile ntawm 1100 MPa thiab cov ntsiab lus tawm ntawm 950 reacts thiab load ntau dua.
