ASTM A441,A455 steel is a series of boilers and pressure vessel steel. Compare to their chemical composition and mechanical properties,they are all different. But we can see, ASTM A 455 owns higher class than A441.
ASTM A441,A455 chemical composition :
Grade |
C (max) |
Si (max) |
Mn |
P (max) |
S (max) |
Cu (min) |
V(min) |
|
A 441 |
0.22 |
0.3 |
0.85-1.25 |
0.04 |
0.05 |
0.2 |
0.02 |
|
A455 |
0.18 |
0.4 |
0.5-1.4 |
0.03 |
0.03 |
0.3 |
0.05 |
ASTM A441,A455 mechanical properties
|
Grade |
Thickness (mm) |
Tensile strength Rm for product thickness in mm |
Upper yield stress ReH for product thickness in mm |
Elongation after fracture |
|
A 445 |
≤ 16 |
370-490 |
275 |
23 |
|
16-35 |
275 |
|||
|
35-50 |
265 |
|||
|
50-70 |
255 |
|||
|
70-100 |
350-470 |
235 |
||
|
100-150 |
225 |
|||
|
> 150 |
-- |
24 |
||
|
A 441 |
|
169 |
151 |
15 |
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