Q1: Cov kauj ruam tseem ceeb hauv QR420 cov yeeb nkab tau ua dab tsi?
Q420 steel yeeb nkab ntau lawm feem ntau muaj feem cuam tshuam nrog steelmaking, txuas ntxiv casting, dov, kho cua, cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov, thiab kuaj cua sov Cov theem steelmaking siv LF + Vd kho kom zoo dua qub, nruj tus qauv sulfur thiab phosphorus txheem (ob qho tsawg dua lossis sib npaug nrog 0.030%). Electromagnetic stirring yog siv thaum nruam nruam kom txo qis cais thiab txhim kho billet zoo. Qhov kub npau taws theem siv cov tswj dov thiab tswj txias (TMCP) los ua kom zoo microstructure thiab cov khoom. Norchizing lossis quenching thiab kev kho tempering thiab kev sim siab yog qhov yuav tsum tau txhim kho lub zog thiab tawv. Thaum kawg, kev sim ua tsis tau zoo (UT, MT, thiab lwm yam) thiab cov khoom ntiag tug cov cuab yeej raug ua kom ntseeg tau tias cov khoom zoo.
Q2: Vim li cas thiaj li tsim nyog rau ib txwm tsim nyog rau Q420D / e steel yeeb nkab?
Kev ua haujlwm ib txwm tau tshem tawm cov kev ntxhov siab tom qab kub dov thiab tiv thaiv kev tiv thaiv qis-kub brittle bacitate. Cua sov rau thaj av Austenite (880-920 degree) ua raws li cov cua txias ua cov khaub noom zoo nkauj ferrite + Pearlite micrlittructure. Li cas los hloov cov noob nplej (grain loj dua lossis sib npaug nrog 8) thiab cuam tshuam ntau dua qhov kev cuam tshuam nyuaj ntawm cov yeeb nkab steel. Piv rau lub xeev kub-rolled, li qub Q420d / e hlau cov ntawv pov thawj dua tsawg-kub cuam tshuam lub zog, cov kev pabcuam uas yuav tsum muaj ntawm -20℃lossis -40 degree. Tsis tas li ntawd, ib txwm txhim kho cov txheej txheem thiab weldability, txo qhov xav tau ntawm kev kho cua sov tom ntej.
Q3: Cov kev xav tau tshwj xeeb rau kev tsim cov Q420 Welded Steel Yeeb Nkab Yog Dab Tsi?
Q420 welded steel yeeb nkab yuav tsum muaj cov txheej txheem hydrogen tsawg (pom) lossis ntau zaus vuam (HFW)) kom txo qis kev pheej hmoo ntawm kev kis mob khaub thuas. Vuam celumables yuav tsum phim cov khoom ntawm cov khoom siv hauv paus. Nickel-ntim cov hlau vuam (xws li H08MNNtIZNO) yog pom zoo kom txhim kho qis-kub. Yuav tsum muaj weld alld ua tau, ib qho nyob hauv zos lossis thoob plaws, kom tshem tawm cov kev ntxhov siab weld kev ntxhov siab. Welds yuav tsum dhau Ultrasonic (UT) thiab iPhoneGraphic (RT) kuaj kom ntseeg tau tias lawv tsis muaj qhov tsis xws luag. Rau cov ntawv thov tsawg-ntsuas kub, cuam tshuam kev xeem ntawm -20℃kuj yuav tsum tau ua kom ntseeg tau tias qhov tawv ntawm Weld thiab cua sov-cuam tshuam cov qauv.
Q4: How can we ensure the quality of thick-walled Q420 steel pipe (>50 hli)?
Thick-walled steel yeeb nkab yuav tsum nruj rolling txheej txheem tswj kom paub meej qhov sib piv ntawm ntau dua los yog sib npaug rau 3: 1 los tiv thaiv cov qog tseem ceeb. Thaum ib txwm ua, lub sijhawm uas tau tuav tseg yuav tsum txuas ntxiv (2.4 feeb / hli) los ua kom muaj kev hloov kho micrformation txaus. Kev sim ultrasonic (U) yuav tsum tsom rau kev kuaj xyuas cov kev tsis xws luag (xws li suav nrog thiab delamination). Cov cuab yeej cuab yeej cov cuab yeej yuav tsum tau ua los ntawm kev ntsuas ntawm 1/4 ntawm phab ntsa tuab kom ntseeg tau tias niaj hnub ua tau tag nrho. Tsis tas li ntawd, cov kav dej tuab-walled yuav tsum yauv mus ua haujlwm hydostratic ua ntej kev xa khoom kom paub txog lawv lub siab-muaj peev xwm muaj peev xwm.
Q5: Cov Qauv Tseem Ceeb Rau Q420 Cov Khoom Siv Ntau Lawm rau cov yeeb nkab steel?
Cov qauv hauv tsev muaj suav nrog GB / T 1591 (GB / T 90162 (seamless cov yeeb nkab cov yeeb nkab), thiab GB / T 9711 l450m (kab). Cov Qauv Thoob Ntiaj Teb muaj xws li en 10210 (s460n) thiab ASTM A572 Gr.65 (uas yuav tsum tau xeem cov kev cuam tshuam ntxiv). Cov khoom xa tawm yuav tsum ua raws li CE, PED, thiab lwm yam ntawv pov thawj, thiab muab daim ntawv qhia tsawg-kub uas cuam tshuam. Cov qauv sib txawv muaj qhov sib txawv me ntsis rau cov tshuaj sib txawv, cov khoom siv neeg siv cov neeg siv khoom, thiab kuaj cov qauv tsim nyog yuav tsum tau xaiv raws li kev npaj.
