ASTM A302 Qib D thiab Qib B yog ob qho tib si manganese-molybdenum alloy steels rau cov hlab ntsha siab, tab sis Qib D feem ntau muaj cov nickel (Ni), muab cov khoom zoo dua qub, thaum Qib B yog tus qauv Mn-Mo; Qhov sib txawv tseem ceeb nyob rau hauv lawv cov tshuaj muaj pes tsawg leeg, nrog rau qib D's Nickel ntxiv txhim kho toughness thiab kev ua tau zoo, thaum Qib B tsom rau lub hauv paus lub zog thiab ductility, ob qho tib si ua haujlwm rau siab - kub / siab siv xws li boilers.
Tshuaj muaj pes tsawg leeg
|
A302 GrD tshuaj muaj pes tsawg leeg |
|||||||
|
Carbon, max |
% |
Manganese, max |
% |
Silicon, max |
% |
Sulfur max |
% |
|
25mm los yog qis dua |
0.2 |
Kev Ntsuas Kub |
1.15-1.50 |
Kev Ntsuas Kub |
0.15-0.40 |
Tag nrho cov tuab |
0.035 |
|
25-50 hli |
0.23 |
Kev tshuaj xyuas khoom |
1.07-1.62 |
Kev tshuaj xyuas khoom |
0.13-0.45 |
||
|
tshaj 50mm |
0.25 |
|
|
|
|
||
|
|
|
Molybdenum max |
% |
Nickel max |
% |
Phosphorus |
% |
|
|
|
Kev Ntsuas Kub |
0.45-0.60 |
Kev Ntsuas Kub |
0.70-1.00 |
Tag nrho cov tuab |
0.035 |
|
|
|
Kev tshuaj xyuas khoom |
0.41-0.64 |
Kev tshuaj xyuas khoom |
0.67-1.03 |
||
|
A302 Qib B tshuaj muaj pes tsawg leeg |
|||||||
|
Carbon, max |
% |
Manganese, max |
% |
Silicon, max |
% |
Sulfur max |
% |
|
25mm los yog qis dua |
0.2 |
Kev Ntsuas Kub |
1.15-1.50 |
Kev Ntsuas Kub |
0.15-0.40 |
Tag nrho cov tuab |
0.035 |
|
25-50 hli |
0.23 |
Kev tshuaj xyuas khoom |
1.07-1.62 |
Kev tshuaj xyuas khoom |
0.13-0.45 |
||
|
tshaj 50mm |
0.25 |
|
|
|
|
||
|
|
|
Molybdenum max |
% |
Nickel max |
% |
Phosphorus |
% |
|
|
|
Kev Ntsuas Kub |
0.45-0.60 |
Kev Ntsuas Kub |
… |
Tag nrho cov tuab |
0.035 |
|
|
|
Kev tshuaj xyuas khoom |
0.41-0.64 |
Kev tshuaj xyuas khoom |
… |
||
Mechanical Property
|
Mechanical Property ntawm A302GrD steel phaj |
A302 Gr |
|
Tensile zog, kis [MPa] |
80-100 [550-690] |
|
Yield zog, min, kis [MPa] |
50 [345] |
|
Elongation hauv 8 nti [200 mm], min, % |
17 |
|
Elongation hauv 2 nti [50 mm], min, % |
20 |
|
Mechanical Property ntawm A302 Qib B steel phaj |
A302 Qib B |
|
Tensile zog, kis [MPa] |
80-100 [550-690] |
|
Yield zog, min, kis [MPa] |
50 [345] |
|
Elongation hauv 8 nti [200 mm], min, % |
15 |
|
Elongation hauv 2 nti [50 mm], min, % |
18 |
ASTM A302 Specification: Npog qis- alloy steel phaj rau welded boilers thiab siab hlab ntsha, nrog qib A, B, C, thiab D.
Qib B: Ib tus qauv Mn-Mo (Manganese-Molybdenum) alloy steel, muab lub zog zoo thiab ductility rau kev siv lub nkoj dav dav.
Qib D: A Mn-Mo-Ni (Manganese-Molybdenum-Nickel) alloy steel, txhais tau tias nws ntxiv Nickel rau lub hauv paus muaj pes tsawg leeg, uas txhim kho nws cov tawv thiab tsim nyog rau cov kev xav tau ntau dua, feem ntau piv rau lwm cov nickel alloy steels xws li ASTM A203 Qib D. (3.
Qhov txawv ntawm qhov tseem ceeb: Qhov tseem ceeb sib txawv yog qhov sib ntxiv ntawm Nickel hauv Qib D, ua rau nws muaj zog dua -kev ua tau zoo alloy piv rau Qib B rau qhov tshwj xeeb siab- kev ntxhov siab lossis kev siv cryogenic uas yuav tsum tau muaj zog dua.
