1. Cov khoom sib xyaw & cov khoom tseem ceeb
Q:Dab tsi txhais cov tshuaj / txhua yam khoom ntawm 42CrMo4?
A:
Chemical (wt%):
C: 0.38–0.45 | Cr: 0.90–1.20 | Mo: 0.15–0.30 | Mn: 0.60–0.90 | P/S:Tsawg dua lossis sib npaug li 0.025.
Mechanical:
Yield zog (sᵧ):Ntau tshaj lossis sib npaug rau 700 MPa |Tensile (sₜ):850-1,000 MPa.
Elongation (A₅):Ntau dua lossis sib npaug li 12% |Kev cuam tshuam (KV):Ntau tshaj lossis sib npaug rau 25J ntawm -20 degree.
Nco tseg:42CrMo4 yog asiab -lub zog Cr-Mo alloy steelnrog tshwj xeeb hardenability (Jominy xeem: Ntau tshaj los yog sib npaug rau 25mm ntawm 50HRC).
2. Kev tsim khoom & qauv ua raws
Q:Yuav ua li cas yog 42CrMo4 raj tsim thiab ntawv pov thawj?
A:
Txheej txheem: Seamless nkaus xwb(kub- dov + precision txias-kos).
Kev kho cua sov:Yuav tsum tau Q&T (Quenching ntawm 850-880℃+ Tempering ntawm 550-650 degree).
Standard Scope:TS EN 10297-1 rau ultra- cov ntawv thov kev nyuaj siab (xws li aerospace, roj drilling).
3. Dimensional Tolerances
Q:Dab tsi kam rau ua rau 42CrMo4 raj?
A:
| Parameter | Ua siab ntev | Kev thuam |
|---|---|---|
| OD | ± 0.7% (min ± 0.3 hli) | Xyuas kom muaj kev cuam tshuam haum |
| Phab ntsa Thickness | ± 7% (min ± 0.3 hli) | Tseem ceeb heev rau lub neej qaug zog |
| Kev ncaj | Tsawg dua lossis sib npaug li 1.0 mm / m | Qhov tseem ceeb rau dynamic load qhov chaw |
4. Daim Ntawv Thov & Kev Txwv
Q:Qhov twg yog 42CrMo4 feem ntau siv?
A:
Ib puag ncig zoo heev:
Roj laum dab tshos, submarine Cheebtsam.
Lub dav hlau tsaws iav (hardened rau 45-50 HRC).
Zam:
Temperatures >600℃(kev pheej hmoo ntawm carbide nag lossis daus).
Vuam yam tsis muaj PWHT (post-weld kev kho cua sov ntawm 600-650℃).
5. Kev lees paub zoo & ntawv pov thawj
Q:Yuav ua li cas thiaj paub tseeb?
A:
Yuav tsum xeem:
Tensile (EN ISO 6892-1)|Kev cuam tshuam (ISO 148-1 ntawm -20 degree).
NDT:100% phased array UT (EN ISO 10893-11) + MPI (ISO 10893-8).
Cov ntawv pov thawj:EN 10204 3.2|PED 2014/68/EU (Qeb IV).
