Q355 steel yog dab tsi, thiab qhov kev xaiv qib txhais li cas?
Q355 yog qib nyob rau hauv GB / T 1591-2018 tus qauv "Low Alloy High Strength Structural Steel," hloov cov qib Q345. "Q" sawv cev rau lub zog tawm los, thiab "355" qhia qhov tsawg kawg nkaus lub zog ntawm 355 MPa rau thicknesses tsawg dua los yog sib npaug rau 16 hli. Cov lus xaus A / B / C / D / E qhia cov qhab nia zoo, sib xws rau cov kev xav tau sib txawv ntawm qhov toughness.
2. Dab tsi yog qhov txawv ntawm Q355, Q235, thiab Q345?
Lub zog: Lub zog tawm ntawm Q355 (355 MPa) yog kwv yees li 50% siab dua li ntawm Q235 (235 MPa) thiab 10 MPa siab dua li ntawm Q345 (345 MPa).
Kev ua tau zoo: Q355 nthuav tawm qhov qis dua -kub toughness, weldability, thiab qaug zog tsis kam, ua rau nws haum rau nruab nrab - rau - hnyav hnyav thiab cov xwm txheej nyuaj.
Cov ntawv thov: Q235 yog siv rau lub teeb- cov qauv thauj khoom, Q355 yog cov hlau tseem ceeb rau cov qauv tsim, thiab Q345 tau maj mam hloov los ntawm Q355.
Dab tsi yog cov khoom siv kho tshuab ntawm Q355?
Yield zog: Tsawg dua los yog sib npaug rau 16mm Ntau dua los yog sib npaug rau 355MPa; 16-40mm Ntau dua lossis sib npaug rau 345MPa; 40-63mm Ntau dua lossis sib npaug rau 335MPa.
Tensile zog: 470-630MPa; elongation Ntau dua lossis sib npaug li 21%; tsis muaj kab nrib pleb tom qab 180℃txias khoov.
Lub zog cuam tshuam: Qib B Ntau dua lossis sib npaug rau 34J ntawm 20 degree, Qib D Ntau dua lossis sib npaug rau 34J ntawm -20 degree.
5. Dab tsi yog cov pa roj carbon sib npaug rau Q355, thiab nws cuam tshuam dab tsi rau vuam?
Carbon sib npaug Ceq Tsawg dua lossis sib npaug li 0.43% (Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15). Qhov qis dua cov pa roj carbon sib npaug, qhov zoo dua qhov weldability. Thaum vuam tuab daim hlau, cov pa roj carbon sib npaug yuav tsum tau tswj kom tsis txhob muaj qhov txias txias.