What is the difference between A335 P22 and P91?
Oct 22, 2024
A335 P22 steel
A335 P22 steel is 2 1/4Cr-1Mo bainitic heat-resistant steel, widely used in steam pipes with working temperature ≤570℃, with high high temperature oxidation resistance and thermal strength, and its supply state is 940-960℃ normalized and 730-750℃ tempered.
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A335 P91
A335 P91 steel has good high temperature endurance strength, thermal stability and high temperature creep resistance, and the linear expansion coefficient is 12.6×10-6℃-1 at 20～600℃. This feature avoids creep fatigue cracks when P91 steel is connected with pearlite steel during operation. It is widely used in chemical and petroleum refining projects, especially in ultra-high pressure steam pipelines. P91 belongs to medium alloy heat-resistant steel (classified by alloy content) and new fine-grained strong martensitic heat-resistant steel (classified by metallographic structure). The main alloying element is Cr. In fact, V, Nb, N and other strengthening elements are added to the original 9Cr-1Mo steel to form a new modified steel.
|
C |
Mn |
P≤ |
S≤ |
Si |
Cr |
|
0.08-0.12 |
0.30-0.60 |
0.020 |
0.010 |
0.20-0.50 |
8.0-9.50 |
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Mo |
V |
N |
Ni≤ |
Al≤ |
Nb |
|
0.85-1.05 |
0.18-0.25 |
0.03-0.07 |
0.40 |
0.04 |
0.06-0.10 |
