1. Cov qib khoom siv tseem ceeb
Q:Dab tsi steel qib yog tus qauv rau honed raj?
A:
Cov pa roj carbon steel:
ASTM A519 1020/1026 (σᵧ Ntau dua lossis sib npaug rau 350 MPa, kev siv hydraulic dav dav).
DIN 2391 St52 (Lub Tebchaws Yelemees), JIS G3445 STKM 13A (Nyiv).
Alloy Steels:
4130/4140 (Cr-Mo, rau siab- siab lub tog raj kheej, hardness 200–250 HB).
Stainless hlau:
304/316 (ASTM A312) rau corrosive lossis zaub mov-qib daim ntawv thov.
Nco tseg:CK45 (DIN) yog ib hom European sib npaug rau 1045 (ASTM).
2. Chemical Composition Control
Q:Dab tsi yog qhov tseem ceeb ntawm cov khoom txwv?
A:
| Lub ntsiab | Limit (wt%) | Kev cuam tshuam |
|---|---|---|
| C | 0.18–0.28 | Lub zog / honing compatibility |
| S/P | Tsawg dua lossis sib npaug li 0.025 | Tiv thaiv micro- tawg |
| Cr | 0.8–1.1 (4130) | Txhim kho hardenability |
| Ntsiab:Tsawg O / N / H (tsawg dua lossis sib npaug li 30 ppm) kom tsis txhob muaj porosity thaum honing. |
3. Kev kho cua sov yuav tsum tau ua
Q:Honed tubes thermally ua li cas?
A:
Normalizing:900-950℃(ASTM A519) rau cov qauv zoo li qub.
Quenching & Tempering (Q&T):Rau 4140: 850℃roj quench → 600℃temper.
Stress Relieving:Ncej -honing ntawm 500–550℃(ISO 10763).
Qhov tshwm sim:550-850 MPa nrog 15-20% elongation.
4. Nto Finish & Honing Standards
Q:Vim li cas qhov chaw tiav yog qhov tseem ceeb?
A:
Honing Qib:Ra Tsawg dua lossis sib npaug li 0.4 µm (ISO 1219) rau U- khob / piston seals.
Plating Options:
Hard chrome (20-50 µm, ISO 4525).
Electroless npib tsib xee (rau corrosion kuj).
Polishing:Daim iav tiav (Ra Tsawg dua lossis sib npaug li 0.2 µm) rau siab - daim ntawv thov ceev.
2025 Trend:Laser -honing hybrid txheej txheem ua tiav Ra Tsawg dua lossis sib npaug li 0.1 µm.
5. Kev lees paub zoo & ntawv pov thawj
Q:Kev ntseeg ntawm cov khoom siv tau li cas?
A:
NDT:100% ultrasonic (ISO 10893-1) + eddy kuaj tam sim no.
Mechanical Tests:Tensile (ASTM E8), Charpy impact (ISO 148-1).
Cov ntawv pov thawj:ISO 10763 (hydraulic), DIN 2391 (precision), PED 2014/68 / EU (cov cuab yeej siv siab).
