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ASTM A335 P91 Alloy Steel Pipe
Material and Specification
ASTM A335 P91 is a grade of seamless alloy steel pipe designed for high-temperature service. It belongs to the ASTM A335 standard, which covers seamless ferritic alloy steel pipe for high-temperature service. The material is well-suited for use in power plants, refineries, petrochemical plants, and other industries where high-temperature and high-pressure conditions are encountered.
The specification of ASTM A335 P91 includes the following details:
| Property | Specification |
|---|---|
| Standard | ASTM A335 |
| Grade | P91 |
| Size Range | 1/8" - 24" |
| Outer Diameter | 6-2500mm; WT:1-200mm |
| Length | 6 meters or custom |
| Ends | Plain or beveled |
| Surface Finish | Black, Bare, Varnish, FBE |
| Manufacturing Process | Hot-finished or cold-drawn |
Chemical Composition
The chemical composition of ASTM A335 alloy steel pipe is carefully controlled to achieve the desired properties. The table below outlines the typical chemical composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 - 0.12 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | 0.020 |
| Sulfur (S) | 0.010 |
| Silicon (Si) | 0.20 - 0.50 |
| Chromium (Cr) | 8.00 - 9.50 |
| Molybdenum (Mo) | 0.85 - 1.05 |
| Vanadium (V) | 0.18 - 0.25 |
| Nitrogen (N) | 0.030 - 0.070 |
Mechanical Properties
The mechanical properties of ASTM A335 P91 alloy steel pipe are crucial for its performance under high-temperature and high-pressure conditions. The following table shows the typical mechanical properties:
| Property | Value |
|---|---|
| Tensile Strength | 585 MPa min (ksi 85) |
| Yield Strength | 415 MPa min (ksi 60) |
| Elongation | 20% min |
| Hardness (HB) | 250 max |
| Reduction of Area | 30% min |
Steel Grade and Applications
ASTM A335 P91 is one of the most widely used grades of alloy steel pipe due to its excellent combination of high-temperature strength, corrosion resistance, and fabricability. It is commonly used in applications such as:
Power Plants: ASTM A335 P91 pipes are extensively used in the construction of boilers, superheaters, and heat exchangers in power plants. The high-temperature strength makes it suitable for steam pipelines and other components that handle high-pressure and high-temperature steam.
Refineries: In the oil and gas industry, ASTM A335 P91 pipes find applications in refineries, especially in high-temperature cracking units and distillation columns.
Petrochemical Plants: The alloy steel pipes are utilized in various processes within petrochemical plants, such as in cracking furnaces, catalytic cracking units, and high-temperature chemical reactors.
High-Temperature Services: Apart from the specific industries mentioned above, ASTM A335 P91 pipes are used in any process or application involving elevated temperatures and aggressive environments.
We have professional people to design the appearance and structure of our 8 Inch (OD: 219.1*thickness: 8.18) Tube Seamless A335 Gr P91, so that it is always in the leading position of similar products. Over the years, we have achieved rapid development with strong technical strength, mature products, and perfect service system, and won the trust and support of customers at home and abroad. At the same time, we actively absorb advanced technology, use cost advantages, and combine independent innovation to develop a variety of new products.
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