A204 Qib B thiab A204 Qib C yog molybdenum{2}} alloy steel daim hlau tsim los rau ASTM A204 / A204M tus qauv, tsim tshwj xeeb rau fusion-welded siab hlab ntsha thiab boilers ua haujlwm ntawm qhov kub siab. Cov qib no yog cov yam ntxwv los ntawm qhov sib ntxiv ntawm molybdenum (Mo), uas ua rau muaj kev cuam tshuam loj heev thiab siab - qhov kub thiab txias. Lawv tau siv dav hauv kev tsim cov khoom hnyav- phab ntsa siab cov hlab ntsha, cov khoom siv hluav taws xob sib hloov, thiab cov chav boilers hauv kev tsim hluav taws xob thiab kev lag luam petrochemical uas yuav tsum tau ua haujlwm ruaj khov ntawm qhov kub thiab txias.
Qhov txawv tseem ceeb:
Qhov sib txawv tseem ceeb yog lawv lub zog, uas yog ncaj qha mus rau cov ntsiab lus carbon. A204 Qib B muaj cov ntsiab lus carbon ntau ntawm 0.20–0.26% thiab muab lub zog qis kawg nkaus ntawm 275 MPa (40 ksi) thiab lub zog tensile ntawm 485–620 MPa (70–90 ksi). A204 Qib C muaj cov pa roj carbon ntau dua ntawm 0.23–0.29%, uas ua rau muaj zog tsawg kawg nkaus ntawm 295 MPa (43 ksi) thiab tensile zog ntawm 515–655 MPa (75–95 ksi).
Qhov siab dua cov ntsiab lus ntawm Qib C no ncaj qha ua rau cov pa roj carbon ntau dua (Ceq) piv rau Qib B. Yog li ntawd, A204 Qib C yuav tsum tau siv cov txheej txheem vuam nruj dua, tshwj xeeb tshaj yog hais txog kev ua kom sov thiab tom qab-weld heat treatment (PWHT), los tiv thaiv hydrogen-induced{4} cheeb tsam. Ob qib yuav tsum tau PWHT rau feem ntau thicknesses ib ASME Boiler thiab Pressure Vessel Code yuav tsum.
Tshuaj muaj pes tsawg leeg
|
A204GrB tshuaj muaj pes tsawg leeg |
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|
Qib |
Cov ntsiab lus Max (%) |
||||
|
C |
Si |
Mn |
P |
S |
|
|
A204 GrB |
0.20-0.27 |
0.13-0.45 |
0.90-0.98 |
0.035 |
0.035 |
|
A204 GrC tshuaj muaj pes tsawg leeg |
|||||
|
Qib |
Cov ntsiab lus Max (%) |
||||
|
C |
Si |
Mn |
P |
S |
|
|
A204 GrC |
0.23-0.28 |
0.13-0.45 |
0.90-0.98 |
0.035 |
0.035 |
Mechanical Property
|
Mechanical Property ntawm A203 GrB steel phaj |
A204 GrB |
|
Tensile zog, kis [MPa] |
70-90 [485-620] |
|
Yield zog, min, kis [MPa] |
40 [275 |
|
Elongation hauv 8 nti [200 mm], min, % |
17 |
|
Elongation hauv 2 nti [50 mm], min, % |
21 |
|
Mechanical Property ntawm A204 GrC steel phaj |
A204 GrC |
|
Tensile zog, kis [MPa] |
75-95 [515-655] |
|
Yield zog, min, kis [MPa] |
43 [295] |
|
Elongation hauv 8 nti [200 mm], min, % |
16 |
|
Elongation hauv 2 nti [50 mm], min, % |
20 |
