1. Dab tsi yog ovtm 519 5150 cov yeeb nkab steel?
Teb:
Tus Qauv: ASTM A519 qhia meej txog cov tshuaj yeeb
Composition:
Carbon 0.48% -0.53%, chromium 0.70% -0.90% (txhim kho kev nyuaj thiab corrosion tsis kam);
Manganese 0.70% -0.90% (txhim kho kev nruj me ntsis).
Piv rau 5147: Nws muaj cov ntsiab lus carbon ntau dua (5150 muaj cov ntsiab lus carbon ntau dua lossis sib npaug nrog 0.45%), ua rau nws haum ntau rau kev cuam tshuam.
2. Dab tsi yog cov khoom ntiag tug ua haujlwm rau 5150 tus yeeb nkab steel? Teb:
Raug cov khoom hauv cov quenched thiab tempered lub xeev (hais txog los ntawm AISI 5150):
Lub zog tensile: ntau dua los yog sib npaug rau 930 MPa (tom qab quenching thiab tempering);
Paib lub zog: ntau dua los yog sib npaug rau 785 mpa;
Elongation: ntau dua los yog sib npaug rau 10%;
Kev cuam tshuam hluav taws xob: ntau dua lossis sib npaug rau 27 j (Charpy v - tsis yog txias, chav sov).
NCO TSEG: ASTM A519 tsis ncaj qha hais txog qhov tseem ceeb; Cov kev ntseeg no yuav tsum tau sib khom raws li cov txheej txheem kho cua sov.
3. Dab tsi yog cov ntsiab lus tseem ceeb ntawm kev kho cua sov rau 5150?
Teb:
Txheej Txheem Txheej Txheem:
Quenching: Roj quenching ntawm 830 - 860℃(chromium txhim kho cov khoom nyuaj, haum rau ntu loj);
Tempering: 450 - 600} 600 {{{kub npau taws, qhov siab kub npau npau ua kom muaj zog ua haujlwm.
Cov Kev Tswj Tshwj Xeeb:
Zam kev ua kom txias txias hauv 250-400℃ntau yam (los tiv thaiv kev kub siab brittleness);
Welded qhov xav tau Post - Weld ntxhov siab rau kev hloov kho (tuav ntawm 650℃nrog qeeb txias).
4. Muab piv nrog 4140 cov yeeb nkab steel, cov txiaj ntsig thiab cov kev txwv ntawm 5150 yog dab tsi? Teb:
Qhov Zoo:
Cov ntsiab lus Chromium ntau dua (5150: 0.7% -0.9% vs . 4140: 0.8% -1.1%), zoo dua corrosion tsis kam;
Cov ntsiab lus carbon me carbon, ntsuas lub zog thiab kev sib luag.
Txwv:
Tsis muaj Molybdenum cov ntsiab lus (4140 muaj 0.15% {- 0.} 0.% Molybdenum), tsis muaj zog siab-kub kub lub zog;
Tsis haum rau ntev - tsis siv nyob rau hauv ib puag ncig saum 400 degree.
5. Cov ntsiab lus tseem ceeb ntawm 5150 kav hlau tau sim?
Teb:
Yuav tsum tau tshawb xyuas cov khoom kuaj:
Kev tsom xam spectral (los xyuas kom meej cr / mn cov ntsiab lus raws cov qauv);
Kev sim ua kom tiav kev ua haujlwm nyuaj (los xyuas cov kev kho mob ua kom sov);
Kev sim ultrasonic (sab hauv tsis xws luag los yog sib npaug ntawm φ2mm sib npaug).
Muaj ntxiv yuav tsum muaj: Jominin Hardenabil curves muaj nyob rau thaum thov (rau loj - qhov loj me).
6. Dab tsi yog cov ntawv thov raug rau 5150 tus kav hlau hlau? A:
Cov Machinery: Tsuas yog Shafts, Gearbox Drive Shafts;
Automotive: high - Kev ua yeeb yam crankshafts, vaj txiv ntoo zoo;
Cov Khoom Siv Zog: Hydroelectric Main Shafts (yuav tsum tau anti - corrosion txheej);
Kev tsim tub rog: Cov cuab yeej siv tsheb ncua kev ncua.
