1. Dab tsi tsis yog -kev kuaj kev puas tsuaj (NDT) yuav tsum siv rau ASTM A672 yeeb nkab?
Teb: Tus txheej txheem mandates NDT kom ntseeg tau tias weld kev ncaj ncees thiab cov khoom zoo. Rau ERW yeeb nkab,Kev kuaj ultrasonic (UT)yuav tsum tau kuaj xyuas sab hauv / sab nraud tsis xws luag hauv cov vuam seam thiab lub hauv paus hlau. Qee daim ntawv thov kuj yuav xav tauKev ntsuas hluav taws xob (RT)rau qhov tseem ceeb welds. Hydrostatic testing (kev ntsuas dej siab) yog qhov yuav tsum tau ua kom paub tseeb tias xau nruj thiab lub zog ntawm cov qauv.
2. Dab tsi yog qhov loj me me rau ASTM A672 steel yeeb nkab?
TebASTM A672 npog cov yeeb nkab loj nrog nominal diameters los ntawm2 nti (50mm)rau48 nti (1200mm). Phab ntsa thicknesses ntau yam ntawm Teem caij 10 mus rau Teem caij 160 (los yog kev cai thicknesses ib tus neeg yuav tsum tau), nrog loj diameters feem ntau txwv rau ERW manufacturing (seamless yeeb nkab yog ntau dua rau me me diameters thiab thicker phab ntsa).
3. ASTM A672 txawv li cas ntawm lwm cov qauv zoo xws li ASTM A335?
Teb: ASTM A335 qhia cov yeeb nkab steel hlau (piv txwv li, P11, P22) rau siab - kub, siab - kev pabcuam siab, thaum ASTM A672 tsom raucarbon hlauyeeb nkab nrog qis alloy cov ntsiab lus. ASTM A672 yog tus nqi- siv tau rau cov ntawv thov uas cov hlau tsis muaj corrosion ntxiv / kub ua haujlwm tsis tsim nyog. Tsis tas li ntawd, ASTM A672 tso cai rau ERW manufacturing, whereas ASTM A335 feem ntau yog seamless yeeb nkab.
4. Cov ntawv pov thawj dab tsi thiab cov cim yuav tsum tau ua rau ASTM A672 yeeb nkab?
Teb: Txhua cov yeeb nkab yuav tsum tau cim nrog lub npe ntawm cov chaw tsim khoom, ASTM tus qauv naj npawb (A672), qib, nominal txoj kab uas hla, phab ntsa thickness, cov xov tooj cua sov, thiab cov ntawv pov thawj (xws li ASME Tshooj I lossis Tshooj VIII rau kev siv lub nkoj siab). Daim ntawv qhia txog zeb xeem (MTR) rau ASTM A690 yog xav tau, sau cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab cov txiaj ntsig NDT.
5. Dab tsi yog hom kev ua tsis zoo uas yuav tsum zam thaum siv ASTM A672 yeeb nkab?
Teb: Cov kev pheej hmoo tsis ua haujlwm tseem ceeb suav nrog: ①creep deformation(slow yas deformation) yog tias ua haujlwm siab tshaj qhov ntsuas kub; ②weld tawgvim cov txheej txheem vuam tsis raug lossis tsis txaus NDT; ③corrosion(piv txwv li, oxidation ntawm qhov kub thiab txias los yog aqueous corrosion) yog tias tsis muaj kev tiv thaiv zoo; thiab ④tawglos ntawm overpressure los yog cov khoom tsis xws luag. Kev txhim kho kom zoo, kev saib xyuas, thiab kev ua raws li qhov ntsuas kub / siab txwv txo cov kev pheej hmoo no.
