1. Q: Dab tsi txhais EN10297-1 30CrNiMo8 steel tubes, thiab lawv feem ntau siv qhov twg?
A:
Lus txhais:Seamless precision raj hauv qabTS EN 10297-1standard, ua los ntawm30 CrNiMo8(ib siab- zog, qis- alloy steel nrog chromium, nickel, thiab molybdenum).
Cov ntawv thov tseem ceeb:
Automotive:Siab -cov khoom muaj zog xws li lub zog, qag, thiab turbocharger ncej.
Aerospace:Kev tsaws iav qhov chaw thiab lub cav mounts vim kev qaug zog ua haujlwm.
Roj & Roj:Laum dab tshos thiab downhole cov cuab yeej yuav tsum tau toughness thiab hnav tsis kam.
Qhov zoo:Superior hardenability (txogHRC 54), zoo weldability (nrog ua ntej-/post- kev kho cua sov), thiab cuam tshuam rau qhov kub thiab txias.
2. Q: Dab tsi yog cov khoom siv kho tshuab ntawm 30CrNiMo8 raj rau EN10297-1?
A:
Tensile zog:1000-1200 MPa (tom qab quenching thiab tempering).
Yield zog:Ntau dua lossis sib npaug li 850 MPa.
Elongation:Ntau tshaj los yog sib npaug li 10% (kom paub meej tias ductility nyob rau hauv dynamic loads).
Impact Toughness:Ntau dua lossis sib npaug li 35 J ntawm -40℃(tseem ceeb rau Arctic daim ntawv thov).
Hardness:300–350 HB (ib txwm tshaj tawm -kev kho cua sov).
3. Q: Kev kho cua sov li cas rau 30CrNiMo8 raj, thiab qhov tshwm sim yog dab tsi?
A:
Txheej Txheem Txheej Txheem:
Austenitizing:Kub rau830–{1}} degree, ces roj quench rau martensitic transformation.
Tempering:550-600℃los txhim kho lub zog - toughness tshuav nyiaj li cas.
Cov txiaj ntsig:
Core hardness ntawmHRC 50–54nrog khaws cia ductility.
Txo cov residual stresses, minimizing distortion nyob rau hauv precision qhov chaw.
4. Q: Cov tshuaj muaj pes tsawg leeg ntawm 30CrNiMo8 yog dab tsi, thiab nws cuam tshuam li cas?
A:
Cov ntsiab lus tseem ceeb Alloying (wt.%):
C (0.26–0.34%):Txhim kho hardness thiab hnav tsis kam.
Cr (1.80-2.20%):Txhim kho hardenability thiab corrosion kuj.
Niag (1.80–2.20%):Boosts toughness, tshwj xeeb tshaj yog nyob rau hauv qis kub.
Mos (0.30–0.50%):Tiv thaiv temper brittleness thiab refines grain qauv.
Kev tswj hwm impurity:TsawgP/S(tsawg dua los yog sib npaug rau 0.025%) kom tsis txhob brittleness.
5. Q: Kev sim thiab ntawv pov thawj dab tsi kom ua tau raws li qhov zoo rau cov raj no?
A:
Yuav tsum xeem:
NDT:Ultrasonic (EN 10246-1) lossis magnetic particle soj ntsuam (ASTM A275).
Mechanical:Tensile (EN ISO 6892-1), Charpy impact (EN ISO 148-1).
Metallurgical:Grain loj (ASTM E112), microstructure tsom xam.
Cov ntawv pov thawj:
EN 10204 3.1/3.2Mill Daim Ntawv Pov Thawj.
Kev lag luam- tshwj xeeb:PEB 2014/68/EU(cov cuab yeej siv siab),Nadcap(aerospace).
