1. Q: Dab tsi txhais tau tias EN10297-2 X2CrNiMo17-12-2 raj, thiab lawv siv qhov twg?
A:
Khoom siv Standard:Seamless precision raj hauv qabTS EN 10297-2, ua los ntawmX2CrNiMo17-12-2(ib qho qis-carbon molybdenum- txhim kho austenitic stainless hlau, sib npaug rauAISI 316L).
Cov ntawv thov tseem ceeb:
Kev ua tshuaj lom neeg:Pipelines rau sulfuric / phosphoric acid tuav (tiv thaiv pitting / crevice corrosion).
Tubrog nkoj:Thaum tshav kub kub exchangers nyob rau hauv seawater ib puag ncig (PREN Ntau tshaj los yog sib npaug rau 25).
Kev kho mob:Implantable device Cheebtsam (ISO 5832-1 ua raws).
Qhov zoo:
Mos (2.0–2.5%):Boosts chloride kuj vs. standard 304L.
Cov pa roj carbon tsawg (tsawg dua lossis sib npaug rau 0.03%):Tshem tawm rhiab heev thaum vuam.
2. Q: Cov khoom siv dab tsi uas yuav tsum tau ua los ntawm EN10297-2?
A:
Raws li -Annealed State:
Tensile zog:500-700 MPa.
Yield zog (Rp0.2):Ntau tshaj lossis sib npaug li 200 MPa.
Elongation (A₅):Ntau dua los yog sib npaug li 40% (tseem ceeb rau qhov txias- sib sau).
Hardness:Tsawg dua lossis sib npaug li 220 HB.
Corrosion Resistance:
CPT (Critical Pitting Temp):Ntau dua lossis sib npaug li 35℃ib ASTM G150.
3. Q: Molybdenum (Mo) ua haujlwm li cas?
A:
Mechanism:
Cov ntawvMoO₄²⁻passive films nyob rau hauv chloride- nplua nuj ib puag ncig.
Synergizes nrog Cr / Ni los txhim kho crevice corrosion kuj.
Kev pauv - tawm:Tus nqi siab dua piv rau Mo- qib dawb (piv txwv li, 304L).
4. Q: Cov tshuaj muaj pes tsawg leeg thiab kev tswj tsis huv yog dab tsi?
A:
Alloy Design (wt.%):
Cr (16.5-18.5%):Base tiv thaiv corrosion.
Niag (10.0–13.0%):Austenite stabilization.
Mos (2.0–2.5%):Qhov tseem ceeb rau chloride kuj.
N (tsawg dua lossis sib npaug rau 0.11%):Txhim kho lub zog yam tsis muaj kev txo qis ductility.
Kev txwv impurity: P/S Tsawg dua lossis sib npaug li 0.040%kom tsis txhob kub tawg.
5. Q: Cov ntawv pov thawj thiab cov ntawv pov thawj zoo li cas?
A:
Kev Ntsuas Cov Txheej Txheem:
Kev kuaj Corrosion:ASTM G48 Txoj Kev A (pitting), ASTM G78 (crevice).
NDT:Eddy tam sim no (EN 10246-3) rau qhov tsis xws luag.
Cov ntawv pov thawj:
EN 10204 3.2nrog tag nrho traceability.
NWS MR0175rau kev pabcuam qaub.
