1. Cov qib khoom siv tseem ceeb
Q:Dab tsi steel qib siv rau hydraulic lub tog raj kheej raj?
A:
Cov pa roj carbon steel:ASTM A519 1020/1026 (kev siv dav dav), tawm lub zog ntau dua lossis sib npaug li 350 MPa.
Alloy Steels:4130/4140 (Cr-Mo, rau siab-} siab), hardness 200–250 HB.
Stainless hlau:304/316 (ASTM A312) rau corrosive ib puag ncig.
Nco tseg:DIN 2391 CK45 (Lub Tebchaws Yelemees) thiab STKM 13A (JIS) yog cov kev xaiv hauv cheeb tsam.
2. Chemical Composition Control
Q:Cov kev cai nruj npaum li cas?
A:
| Lub ntsiab | Limit (wt%) | Yog vim li cas |
|---|---|---|
| C | 0.18–0.28 | Ntsuas lub zog / ductility |
| S/P | Tsawg dua lossis sib npaug li 0.025 | Tiv thaiv kev tawg ntawm vuam |
| Cr | 0.8–1.1 (4130) | Txhim kho hardenability |
| Tseem ceeb:Tsawg O / N / H (tsawg dua lossis sib npaug li 30ppm) kom tsis txhob qaug zog. |
3. Cov txheej txheem kho cua sov
Q:Cov kev kho cua sov yog siv li cas?
A:
Normalizing:900-950℃rau grain refinement (ASTM A519).
Quenching & Tempering:4140 steel rhuab mus rau 850℃→ roj quench → tempered ntawm 600℃.
Stress Relieving:Yuav tsum tau tshaj tawm -honing (ISO 10763).
Qhov tshwm sim:Tensile zog 550-850 MPa nrog 15-20% elongation.
4. Nto Finish Standards
Q:Vim li cas qhov chaw tiav yog qhov tseem ceeb?
A:
Honing:Ua tiav Ra Tsawg dua lossis sib npaug ntawm 0.4 µm (ISO 1219) rau kev sib khi sib khi.
Plating:Hard chrome (20-50 µm, ISO 4525) lossis electroless npib tsib xee rau hnav tsis kam.
Polishing:Daim iav tiav (Ra Tsawg dua lossis sib npaug li 0.2 µm) rau siab -kev siv piston ceev.
2025 Trend:Laser texturing (dimpled nto) txo kev sib txhuam los ntawm 25%.
5. Daim ntawv pov thawj & Kev Xeem
Q:Yuav ua li cas cov khoom zoo validated?
A:
NDT:100% ultrasonic kuaj (ISO 10893-1) + eddy tam sim no rau qhov tsis xws luag.
Mechanical Tests:Tensile (ASTM E8), cuam tshuam (ISO 148-1), hardness mapping.
Daim ntawv pov thawj:EN 10204 3.1 zeb ntawv pov thawj + ISO 10763 rau kev siv hydraulic.
