ASME SA335 P91 boiler steel pipe has good mechanical properties, high temperature resistance, corrosion resistance and creep resistance, which can guarantee the stable operation of the equipment under relatively harsh working environment. However, the welding performance of ASME SA335 P91 boiler steel pipe is poor and the process requirements are difficult.
ASME SA335 P91 boiler steel pipe chemical composition
| Grade |
C |
Mn |
P |
S |
Si |
Cr |
|
SA335 P91 |
0.08-0.12 |
0.3-0.6 |
0.02 |
0.01 |
0.2-0.5 |
8-9.5 |
|
Mo |
V |
N |
Ni |
Al |
Nb |
|
0.85-1.05 |
0.18-0.25 |
0.03-0.07 |
0.4 |
0.04 |
0.06-.01 |
ASME SA335 P91 boiler steel pipe mechanical properties
| Grade |
Tensile strength |
Yield strength |
Elongation % |
Hardness HB |
|
SA335 P91 |
585 Mpa |
415 Mpa |
20 min |
250 max |
ASME SA335 P91 boiler steel pipe wall thickness and tolerance
| Grade |
Hot rolled |
Outside Diameter, mm |
Tolerance, % |
|
OD≤101.6, WT≤2.4 |
+40/-0 |
|
SA335 P91 |
OD≤101.6, 2.4＜WT≤3.8 |
+35/-0 |
|
OD≤101.6, 3.8＜WT≤4.6 |
+33/-0 |
|
OD≤101.6, WT>4.6 |
+28/-0 |
|
OD>101.6, 2.4＜WT≤3.8 |
+35/-0 |
|
OD>101.6, 3.8＜WT≤4.6 |
+33/-0 |
|
OD>101.6, WT>4.6 |
+28/-0 |
|
Cold drawn |
Outside Diameter, mm |
Tolerance, % |
|
OD≤38.1 |
+20/-0 |
|
OD>38.1 |
+22/-0 |
ASME SA335 P91 boiler steel pipe is a kind of ferritic alloy steel, which has very high strength, does not deteriorate with time, and has creep resistance. ASME SA335 P91 boiler steel pipe is also called 9Cr1Mo steel, or chrome molybdenum tube, according to its composition. Compared with T22 or P22, ASME SA335 P91 boiler steel pipe shows high strength and temperature resistance up to 600 ℃.
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