Chn vt liu:Inox 304 c s dng rng ri trong hu ht cc lnh vc trong i sng hng ngy t cng nghip, k thut, trang tr ni thtBng thnh phn ha hc ca inox 304C%Si%Mn%P%S%Cr%Ni%

UNS S30403040.081.002.000.0450.0318.0-20.08.0- 10.5

UNS S30403304L0.031.002.000.0450.0318.0- 20.08.0 -12.0

USN S30409304H0.04-0.11.002.000.0450.0318.0-20.08.0 -12.0

ng ny vic v sinh thit b bng inox 304 rt d dng. Ngoi ra n cn th hin c c tnh chng n mn cao khi tip xc cng ngh dt nhum v trong mi trng Acid v c. Kh nng chng oxid ha trong mi trng c nhit 8700C v tip tc th hin cao kh nng ny nhit 9250C .C tnh ca inox 304 theo bng sau:ng sut bn515 MPa min

Gii hn chy205 Mpa min

Kh nng dn di40% min

cng Brinell201HB max

cng Rockwell92 HRC max

cng Vickers210 HV max

Cng ging nh cc loi thp trong vng Austenitic th inox 304 c tnh nhim t rt yu v hu nh l khng nhim t. Nhng khi lm vic trong mi trng c nhit thp th t tnh ca inox 304 rt mnh ( ngc vi qu trnh ti ) v cng ch c th tng cng trong mi trng nhit thp. ng sut n hi cao nht m inox 304 c th t c l 1000MPa , iu ny s cn nh hng bi cc yu t nh s lng v hnh dng ca vt liu. Ti l phng php chnh sn xut inox 304, nhit ti t 10100C 11200C sau lm lnh t ngt trong mi trng nc.

Tnh theo tiu chun ASME Section VIII Division 1, 2007 Edition Metric

NP, YChn n mn l 3mm- Tnh h s+ H s n mnK = (1/6)*[2 + (D / (2*h))2] = (1/6)*[2 + (3,406 / (2*853))2] = 0.997658+H s khi cha n mnK = (1/6)*[2 + (D / (2*h))2] = (1/6)*[2 + (3,400 / (2*850))2] = 1- Thit k dy chu p trong, (n mn 600 C)t = P*D*K / (2*S*E - 0.2*P) + Corrosion = 540*3,406*0.997658 / (2*65,400*1 - 0.2*540) + 3 = 17.04 mmVy dy thit k p sut bn trong l 17.04 mm.- p sut lm vic ti a cho php, (n mn 600 C)P = 2*S*E*t / (K*D + 0.2*t) - Ps = 2*65,400*1*16 / (0.997658*3,406 +0.2*16) - 0 = 615.32 kPa- Thit k dy cho p sut bn ngoi, (n mn 600 C)V bn knh hnh cu bn ngoi (Ro)Ro = Ko*Do = 0.8902 * 3,438 = 3,060.37 mm A = 0.125 / (Ro/t) = 0.125 / (3,060.37/12.66) = 0.000517T Bng HA-1 Metric B=24.9972 MPaPa = B/(Ro/t) = 24,997.19/(3,060.37/12.66) = 103.4214 kPaT=12.66 mm + Corrosion = 12.66 mm + 3 mm = 15.66 mmKim tra p sut bn ngoi ti a, UG-33 (a) (1) Ph lc 1-4 (c)t= 1.67*Pe*D*K / (2*S*E - 0.2*1.67*Pe) + C = 1.67*103.42*3,406*0.997658 / (2*65,400*1 - 0.2*1.67*103.42) + 3 = 7.49 mm- p lc bn ngoi ti a cho php, (n mn 600 C)V bn knh hnh cu bn ngoi (Ro)Ro = Ko*Do = 0.8902 * 3,438 = 3,060.37 mm A = 0.125 / (Ro/t) = 0.125 / (3,060.37/16) = 0.000654T bng HA-1 Metric: B=26.7337 MPaPa = B/(Ro/t) = 26,733.71/(3,060.37/16) = 139.7693 kPaKim tra p sut bn ngoi ti a, UG-33 (a) (1) Ph lc 1-4 (c)P = 2*S*E*t / ((K*D + 0.2*t)*1.67) - Ps2 = 2*65,400*1*16 / ((0.997658*3,406 +0.2*16)*1.67) = 368.45 kPaCc p lc bn ngoi ti a cho php (MAEP) l 139.77 kPa.Chnh lchChp nhn chiu dy:t=19mm.Khi lng y np elip: 2182 kgTh tch: 5606 litBCHChiu di mt bch thng 50.8 mmChiu dy danh ngha mt bch thng: 28mm- dy thit k ti 600oCt = P*R/(S*E - 0.60*P) + Corrosion = 540.00*1703.00/(65400*1.00 - 0.60*540.00) + 3.00 = 17.1323 mmp sut lm vic ti a cho php, (ti 600.00 C) UG-27 (c) (1)P = S*E*t/(R + 0.60*t) - Ps = 65400*1.00*25.0003 / (1703.00 + 0.60*25.0003) - 0.0000 = 951.6979 kPap lc bn ngoi, (n mn & ti 600.00 C) UG-28 (c)L/Do = 14670.2656/3456.0000 = 4.2449Do/t = 3456.0000/23.337851 = 148.0856

T bng G: A = 0.000161T bng From table G: A = 0.000161P= 4*B/(3*(Do/t))= 4*11.4864/(3*(3456.0000/23.337851))= 103.4214 kPaThit k dy cho p sut bn ngoi Pa = 103.4214 kPaT = t + Corrosion = 23.337851 + 3.00 = 26.34 mmp sut ti a bn ngoi cho php, (n mn & ti 600.00 C) UG-28 (c)L/Do = 14670.2656/3456.00 = 4.2449Do/t = 3456.00/25.0003 = 138.2386T bng G: A = 0.000180T bng HA-1 Metric B = 12.8538 MpaPa=4*B/(3*(Do/t))= 4*12.8538/(3*(3456.00/25.0003))= 123.9771 kPaKhi lng(cha n mn)= 122,9607 kgTh tch: 461,2234 ltTHN-Ti a p lc bn ngoi cho php, (n mn & ti 600.00 C) UG-28 (c)t = P*R/(S*E - 0.60*P) + Corrosion = 540.00*1703.00/(65400*1.00 - 0.60*540.00) + 3.00 = 17.1323 mm-p sut lm vic ti a cho php, (ti 600.00 C) UG-27 (c) (1)P = S*E*t/(R + 0.60*t) - Ps = 65400*1.00*25.0003 / (1703.00 + 0.60*25.0003) - 0.0000 = 951.6979 kPa- p lc bn ngoi, (n mn & ti 600.00 C) UG-28 (c)L/Do = 14670.2656/3456.0000 = 4.2449Do/t = 3456.0000/23.337851 = 148.0856T bng G: A = 0.000161T bng HA-1 Metric: B = 11.4864 MPaPa = 4*B/(3*(Do/t)) = 4*11.4864/(3*(3456.0000/23.337851)) = 103.4214 kPa- Thit k dy cho p lc bn ngoi Pa = 103.4214 kPat + Corrosion = 23.337851 + 3.00 = 26.34 mm - Ti a p lc bn ngoi cho php, (n mn & ti 600.00 C) UG-28 (c)L/Do = 14670.2656/3456.00 = 4.2449Do/t = 3456.00/25.0003 = 138.2386T bng G: A = 0.000180T bng HA-1 Metric: B = 12.8538 MPaPa = 4*B/(3*(Do/t)) = 4*12.8538/(3*(3456.00/25.0003)) = 123.9771 kPaKhi lng: 33886,8047 kgTh tch: 127108,8281 lit