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ASTM A335 P22 Pipe
Material Overview
ASTM A335 P22 is a seamless ferritic alloy steel pipe designed for high-temperature service. It is commonly used in power plants, refineries, and various industrial applications where elevated temperatures and pressures are present.
Specification
The ASTM A335 P22 specification covers seamless ferritic alloy steel pipe for high-temperature service. The pipe shall be suitable for bending, flanging, and similar forming operations, as well as for fusion welding. It is commonly used in the power generation and petrochemical industries.
Chemical Composition
The chemical composition of ASTM A335 P22 steel is critical for its high-temperature performance. The following table provides an overview of the typical chemical composition (percentage by weight) of this alloy:
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|
| Composition % | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 max | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties
The mechanical properties of ASTM A335 P22 ensure its ability to withstand high-temperature and high-pressure conditions. The table below outlines the typical mechanical properties of this alloy:
| Property | Tensile Strength, min. (MPa) | Yield Strength, min. (MPa) | Elongation, min. (%) | Hardness, max. (HB) |
|---|---|---|---|---|
| Value | 415 | 205 | 30 | 163-255 |
Steel Grade
ASTM A335 P22 is classified as a Grade P type alloy, suitable for high-temperature service. The "P" designation indicates that the pipe material is suitable for bending, flanging, and similar forming operations.
Application
ASTM A335 P22 pipes find applications in various industries due to their excellent high-temperature performance. Some of the common applications include:
- Power Generation: Used in power plants for superheater and reheater tubes, as well as in steam pipelines.
- Petrochemical Industry: Employed in refineries and petrochemical plants for high-temperature fluid transportation.
- High-Temperature Services: Used in various industrial processes where elevated temperatures and pressures are encountered.
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