ASTM A203 Grade B steel grade is a nickel alloy steel plate in welded pressure vessels. For this A 203 Gr B plate is max thickness in 150mm and the element of nickel is 2.25% to be used in manufacturing pressure vessel and boilers. The heat treatment requirements for all plates are presented, and all plates under ASTM A203 Grades A, B, D, and E shall be normalized as required.
ASTM A204 Grade B is a kind of Mo-alloy steel material used to fabric high temperature pressure vessels. A204 this property is based on it's Mo composition. A204 Gr B steel is similar to EN 16Mo3, DIN 15 Mo3.
A203 Grade B and A204 Grade B steel composition
Grades |
C max |
Mn max |
Si |
P max |
S max |
Mo |
Ni |
|
A203 Grade B |
0.21 |
0.70(T≤ 50mm) |
0.15-0.40 |
0.025 |
0.025 |
- |
2.10-2.50 |
|
A204 Grade B |
0.20(T≤ 25mm) |
0.90 |
0.15-0.40 |
0.025 |
0.025 |
0.45-0.60 |
- |
Mechanical properties
Mechanical Property |
A203 Grade B |
|
Tensile strength, MPa 50mm and under |
485-620 |
|
Tensile strength, MPa] over 50mm |
485-620 |
|
Yield strength, MPa 50mm and under |
275 |
|
Yield strength, min, MPa Over 50mm |
275 |
|
Elongation in 8 in. [200 mm], min, % |
17 |
|
Elongation in 2 in. [50 mm], min, % |
21 |
A204 Grade B Tensile Requirements
Tensile Strength, (MPa) |
Yield Strength, (MPa) |
% Elongation in 2 in. (50mm) min |
Impacting Test Temperature(°C) |
|
485-620 |
275 |
21 |
-20,40,-60 |
ASTM A203 and ASTM A204 steel plates are intended particularly of welded boilers and others pressure vessels steel plate.
