GB713 Q245R Carbon Steel Phaj

GB713 Q245R Carbon Steel Phaj (R-HIC) yog cov phaj hlau tshwj xeeb tsim los tiv thaiv hydrogen sulfide corrosion, tau lees paub los ntawm ob qho tib si hydrogen-induced cracking (HIC) thiab sulfide stress corrosion cracking (SSCC). Cov hlau no yog tsim los siv lub cub hluav taws xob + ladle refining txheej txheem, nrog nruj tswj cov sulfur thiab phosphorus impurity cov ntsiab lus nyob rau hauv nws cov tshuaj muaj pes tsawg leeg. Cov kev qhia tshwj xeeb qhia tias kev tshuaj ntsuam smelting muaj S Less dua lossis sib npaug li 0.003% thiab P Less dua lossis sib npaug li 0.015%, thaum cov khoom tiav kev tshuaj ntsuam muaj S Less dua lossis sib npaug li 0.004% thiab P Less dua lossis sib npaug li 0.015%. Cov hlau xa tuaj rau hauv lub xeev normalized thiab yuav tsum tau simulated ncej-weld kho cua sov (620 ± 10 degree, tuav rau 8 teev). Cov cuab yeej siv tshuab tau muab qhab nia raws li qhov sib txawv ntawm qhov sib txawv, nrog lub zog tawm los ntawm tsis pub tsawg dua 245MPa rau cov thicknesses tsawg dua lossis sib npaug li 60 hli. Nws cov txheej txheem txheej txheem suav nrog SSCC kuaj (GB4157 / NACE TM0177 tus qauv) thiab simulated ncej-weld heat treatment specifications kom ntseeg tau tias kev pabcuam kev nyab xeeb hauv sulfur- muaj ib puag ncig.

Cov cuab yeej cuab tam rau Q245R Siab lub nkoj steel phaj