1. Dab tsi yog ovtm 519 1518 cov yeeb nkab steel?
A: ASTM A519 yog tus qauv tshwj xeeb rau cov yeeb nkab roj av thiab cov hlab ntsha alloy, thiab 1518 yog ib tus ntawm cov roj carbon sty (sib raug rau uns tsis yog G15180). Nws muaj pes tsawg leeg yog 0.15% -0.20% carbon thiab 1.10% -1.40% manganese. Nws muaj cov nruab nrab lub zog, zoo machinability, thiab weldability, ua rau nws siv ntau hauv cov tshuab tshuab xws li cov phuam thiab cov thooj voos kheej kheej.
2. Dab tsi yog cov khoom ntiag tug cov khoom siv rau 1518 tus yeeb nkab steel?
A: Raws li ASTM A519, cov khoom siv neeg nquag ntawm 1518 steel yeeb nkab muaj xws li:
Lub zog tensile: ntau dua los yog sib npaug rau 485 mpa (70 ksi)
Paib muaj zog: ntau dua los yog sib npaug rau 315 mpa (46 ksi)
Elongation: ntau dua los yog sib npaug rau 20% (50 hli gauge ntev)
Hardness: Feem ntau tsawg dua lossis sib npaug nrog 170 HB (Brinell Hardness). (Ceeb Toom: Qhov kev ntseeg tshwj xeeb yuav sib txawv me ntsis nyob ntawm cov txheej txheem kho kom sov lossis loj.)
3. Dab tsi yog cov ntawv thov tseem ceeb rau 1518 tus yeeb nkab steel?
Teb:
Neeg kho tshuab tsim: Tsav tsaj, iav cam khwb, kheej kheej kheej kheej kheej;
Automotive: cov txheej txheem chassis, lub tshuab siv kauj;
Kev tsim kho dav dav: cov txheej txheem kev ntxhov siab ntau, cov kabmob cov tes tsho;
Thauj cov kua dej: nruab nrab- thiab cov raj xa hluav taws xob qis (raug rau cov qauv kev ua kom siab ntxiv).
4. Cov txheej txheem kho cua sov li cas rau 1518 tus yeeb nkab steel?
Teb:
Normalizing: txhim kho micructubtructure cov khoom sib xws thiab cov neeg kho tshuab cov tshuab;
Quenching thiab tempering: siv rau cov ntawv thov uas yuav tsum tau ua kom muaj zog dua (piv txwv li, quenching thiab tempering);
Annealing: txo kev nyuaj siab txhawm rau txhim kho machinability.
(Cov neeg siv yuav tsum xaiv cov txheej txheem raws li qhov kawg siv; tus qauv tsis tau ua ib qho kev kho cua sov tshwj xeeb.)
5. Dab tsi yog qhov seem thiab kev zam txim rau 1518 tus yeeb nkab steel? A: ASTM A519 npog seamless steel yeeb nkab nrog sab nraud txoj kab uas hla ntawm 6.35 mm (0.25 hauv) txog 250 hli (10 hauv). Kev thev xim suav nrog:
Outer diameter: ±0.79 mm (≤ 48.3 mm) to ±1% (>114.3 mm);
Phab ntsa tuab: ± 10% (yam tsawg kawg nkaus ± 0.4 hli);
Ntev: Feem ntau kho lossis kev cai ntev muaj nyob ntawm kev thov.
