ASTM A203 Grade B Pressure Vessel Alloy steel are used in Pressure Vessel, Boiler, Storage Tanks and Heat Ex-changer in Oil, Gas Project.
ASTM A203 Grade B Pressure Vessel Alloy chemical composition:
|
Grade |
C |
Mn |
P |
S |
Si |
Ni |
|
A203 Grade B |
0.21-0.25 |
0.88 |
0.025 |
0.025 |
0.13-0.45 |
2.03-2.57 |
ASTM A203 Grade B boiler steel mechanical properties:
|
Grade |
Tensile Strength MPa (ksi) |
Yield Strength MPa (ksi) |
% Elongation in 8 in.(200mm) min |
% Elongation in 2 in.(50mm) min |
|
A203 Grade B |
485-620 (70-90) |
275 (40) |
17 |
21 |
The maximum thickness of A203 GR.B boiler steel plates is limited only by the capacity of the composition to meet the specified mechanical property requirements, however, current practice normally limits the maximum thickness of plates furnished under 150 mm.
If approved by the purchaser for A203 Gr. B, cooling rates faster than air cooling are permissible for improvement of the toughness, provided the plates are subsequently tempered at not less than 1100℉[595℃] for not less than ½ h.
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