1.Dab tsi yog cov khoom siv ntawm A691 steel yeeb nkab?
Teb: Cov khoom siv tshuab yog nyob ntawm qib tshwj xeeb thiab kev kho cua sov. Piv txwv li, Qib CM-1Cr feem ntau muaj lub zog tensile ntawm 415-585 MPa (60-85 ksi), yield zog ntawm 205 MPa (30 ksi) min, thiab elongation ntawm 20% min. Cov cuab yeej raug txheeb xyuas los ntawm kev sim tensile, kev sim hardness, thiab kev ntsuam xyuas cuam tshuam raws li ASTM tus qauv.
2.Qhov kev kho cua sov yuav tsum tau ua rau A691 steel yeeb nkab?
Teb: A691 steel kav feem ntau xav tau tom qab-weld kho cua sov (PWHT) kom txo tau kev ntxhov siab thiab txhim kho cov khoom siv kho tshuab. Qhov no suav nrog cua sov cov yeeb nkab rau qhov kub thiab txias (xws li, 1200-1350℃F rau CM-1Cr) thiab tuav rau ib lub sijhawm, ua raws li kev tswj kom txias, raws li tau teev tseg hauv ASTM A691 tus qauv.
3.Dab tsi yog qhov kev txiav txim siab vuam rau A691 steel yeeb nkab?
Teb: Vuam A691 steel yeeb nkab yuav tsum tau ceev faj cov txheej txheem vim nws cov ntsiab lus alloy. Preheating thiab post-weld heat treatment feem ntau tsim nyog los tiv thaiv kev tawg thiab ua kom muaj kev ncaj ncees. Vuam cov ntaub ntawv yuav tsum sib phim lub hauv paus hlau muaj pes tsawg leeg, thiab tsim nyog welders yuav tsum ua raws li cov cai xws li ASME Tshooj IX.
4.A691 steel yeeb nkab txawv ntawm lwm cov kav dej zoo li cas, zoo li A335?
Teb: A691 yog ib qho hluav taws xob- fusion-welded yeeb nkab rau siab - qhov kev pab cuam kub, thaum A335 yog seamless ferritic alloy- cov yeeb nkab steel rau kev siv zoo sib xws. A691 yog welded, ua rau nws yooj yim dua rau txoj kab uas hla loj, qhov A335 yog seamless thiab feem ntau siv rau cov ntawv thov siab dua qhov kev ntseeg siab yog kev txhawj xeeb.
5.Qhov kev ntsuam xyuas thiab kev soj ntsuam yuav tsum ua li cas rau A691 steel yeeb nkab?
Teb: A691 steel kav yuav tsum tau mus rau ntau yam kev ntsuam xyuas, nrog rau kev ntsuam xyuas hydrostatic los kuaj xyuas cov dej xau, tsis yog- kuaj kev puas tsuaj (piv txwv li, radiography lossis ultrasonic kuaj) ntawm welds, tshuaj ntsuam xyuas, thiab kev ntsuas tshuab (tensile, hardness, impact). Kev tshuaj xyuas yog ua tiav raws li ASTM A691 thiab feem ntau suav nrog ntawv pov thawj thiab kos npe.
