Products Description
P91 steel is a new type of martensitic heat-resistant steel developed in cooperation with the National Oak Ridge Laboratory and the Metallurgical Materials Laboratory of the U.S. Combustion Engineering Corporation. It is based on 9Cr1MoV steel to reduce the carbon content, strictly limit the content of sulfur, phosphorus, add a small amount of vanadium, niobium elements for alloying. With P91 steel corresponding to the German steel number for the X10CrMoVNNb91, Japan's steel number for the HCM95, France is TUZ0CDVNb901.
In the use of temperature below 620 ℃, its allowable stress is higher than the austenitic stainless steel. Above 550 ℃, the recommended design allowable stress is about twice as much as T9 and 2.25Cr-1Mo steel.
A335 P91 alloy pipe is widely used, can be used as sub-critical, supercritical boiler wall temperature <625 ℃ high temperature superheater, reheater steel pipe, and wall temperature <600 ℃ high temperature collector and steam piping, but also can be used as a nuclear heat exchanger, as well as oil cracking device furnace pipe.
A335 P91 Seamless Pipes Specification
Size : 1/2" TO 24 "IN OD & NB
Schedule: SCH20, SCH30, SCH40.
Type : Welded / Fabricated / Seamless
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End.
MATERIALS :
Alloy Steel Pipe A335 P91 – AS Pipe A335 P91
P91 Power Plants Alloy Steel Seamless Pipe Chemical Composition
|
Grade |
C, % |
Mn, % |
P, % |
S, % |
Si, % |
Cr, % |
Mo, % |
V, % |
N, % |
Ni, % |
Al, % |
Nb, % |
|
ASTM A335 P91 |
0.08-0.12 |
0.3-0.6 |
0.02 max |
0.01 max |
0.2-0.5 |
8.0-9.5 |
0.85-1.05 |
0.18-0.25 |
0.03-0.07 |
0.4 max |
0.04 max |
0.06-0.10 |
P91 seamless ferritic alloy-steel pipe Equivalent Grades
| ASTM | ASME | Equivalent material | UNS |
|---|---|---|---|
| A335 P91 | SA335 P91 | T91, K90901, X10CrMoVNb9-1, 1.4903 | K91560 |
ASTM A335 P91 High temperature alloy steel pipe Mechanical Properties
|
Tensile Strength, MPa |
Yield Strength, MPa |
Elongation, % |
|
585 min |
415 min |
20 min |
ASTM A335 P91 Seamless Pipes Permissible Variation in Wall Thickness
| NPS [DN] Designator | Tolerance, % from Specified | |
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios | 20.0% | 12.5% |
| Above 2 1/2 [65], t/D < or = 5% | 22.5% | 12.5% |
| Above 2 1/2 [65], t/D > 5% | 15.0% | 12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
Application for:
- Power generation
- Petrochemicals
- Gas processing
- Petrochemical Plants
- Heaters
- Oilfield services
GNEE A335 P91 Alloy Steel Seamless Pipe in stock
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