1. Cov khoom sib xyaw & cov khoom tseem ceeb
Q:Dab tsi txhais cov tshuaj / txhua yam khoom ntawm E420J2?
A:
Chemical (wt%):
C:Tsawg dua lossis sib npaug rau 0.20 |Mn: 1.00–1.70 | P:Tsawg dua lossis sib npaug rau 0.025 |S:Tsawg dua lossis sib npaug rau 0.020 |Al:Ntau dua los yog sib npaug rau 0.020 (txhim kho cov nplej).
Mechanical:
Yield zog (sᵧ):Ntau tshaj lossis sib npaug rau 420 MPa |Tensile (sₜ):520-670 MPa.
Elongation (A₅):Ntau dua lossis sib npaug li 18% |Kev cuam tshuam (KV):Ntau dua lossis sib npaug rau 60J ntawm -20℃(J2npe).
Nco tseg:Cov"J2" lusqhia tau hais tias qis dua -kub toughness rau cov ntawv thov tseem ceeb.
2. Kev tsim khoom & qauv ua raws
Q:E420J2 raj yog tsim thiab ntawv pov thawj li cas?
A:
Txheej txheem:nkaus xwbseamless(kub- dov + txias- kos rau qhov tseeb).
Kev kho cua sov:Quenching & tempering (Q&T) yuav tsum tau (EN 10297-1 §6.3).
Standard Scope:Siab -kev nyuaj siab cov qauv siv tshuab (xws li, cua zog, offshore).
3. Dimensional Tolerances
Q:Dab tsi kam rau ua rau E420J2 raj?
A:
| Parameter | Ua siab ntev | Kev thuam |
|---|---|---|
| OD | ± 0.8% (min ± 0.4 hli) | Xyuas kom nias- haum qhov tseeb |
| Phab ntsa Thickness | ± 8% (min ± 0.4 hli) | Tseem ceeb heev rau kev qaug zog |
| Kev ncaj | Tsawg dua lossis sib npaug li 1.2 mm / m | Qhov tseem ceeb rau dynamic load qhov chaw |
4. Daim Ntawv Thov & Kev Txwv
Q:E420J2 feem ntau siv nyob qhov twg?
A:
Tsawg- Kub:Offshore cua turbine yees, Arctic pipelines.
Heavy Machinery: Mining drill rods, hydraulic rams (>600 bar).
Zam:
Temperatures >550℃(kev pheej hmoo ntawm temper embrittlement).
Tsis siv coated hauv chloride- ib puag ncig nplua nuj.
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 -40℃rau J2 qib).
NDT:100% ultrasonic (EN 10246-1) + Sib nqus particle (ISO 10893-8).
Cov ntawv pov thawj:EN 10204 3.2|PED 2014/68/EU (Qeb IV).
