ASTM A335 P22 Black Painting Alloy Steel Seamless Pipe 2.25Cr-1Mo
ASTM A335 P22 / UNS K21590 Alloy Steel Seamless Pipe 2.25Cr-1Mo Steel Pipe
P22 is comprised predominantly of chromium (2.25%) and molybdenum (1%), which enhances its strength and resistance to high temperatures and pressures. This material has good properties: Good mechanical properties at elevated temperatures. Excellent resistance to oxidation and corrosion, making it suitable for harsh environments. High tensile and yield strength, which allows it to withstand demanding applications.
There are several effective treatments to enhance corrosion resistance and overall durability:
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Black Paint: This is often used for aesthetic purposes and can provide a basic level of protection against minor corrosion. The paint forms a barrier against moisture and contaminants.
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Anti-Corrosion Oil: This type of treatment involves applying a specialized oil that penetrates the metal surface to provide long-term protection against rust. It's especially useful for pipes that will be stored for longer periods before use.
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Galvanized Surface: Galvanization involves coating the steel with a layer of zinc, which protects the underlying metal from rust. This method is highly effective for outdoor applications or environments with high humidity.
ASTM A335 P22 Pipe Specification
| Standard | ASTM A335 P22, SA335 P22 |
| Size | 1/8"- 24" |
| Schedules | sch.10 to sch.XXS |
| Type | Seamless |
| Length | Single Random, Double Random & Cut Length |
| A335 P22 Pipe End | Plain End, Beveled End, Treaded |
| Usage | Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service |
Alloy Steel Pipe Chemical composition(%)
| Grade | C | Mn | P≤ | S≤ | Si | Cr | Mo |
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| P22 | 0.05-0.16 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 |
| P5 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 4.00-6.00 | 0.45-0.65 |
| P9 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 |
| P91 | 0.08-0.12 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | 0.02-0.50 | 8.00-9.50 | 0.85-1.05 |
| P92 | 0.07-0.13 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | ≤0.50 | 8.50-9.50 | 0.30-0.60 |
Alloy Steel Pipe Mechanical properties
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
Manufacturing Process:
Seamless Pipe Production: The manufacturing process involves heating a solid round billet and then piercing it to form a hollow tube. It is then elongated through mandrel mills, which refine it to the desired dimensions sans any seams, providing superior strength.
Heat Treatment: Post-manufacturing, P22 pipes often undergo heat treatment processes such as normalizing or tempering to enhance mechanical properties.
Applications
P22 is suitable for high temperature environments including those found in the following industries
- Pharmaceutical equipment
- Chemical equipment
- Sea water equipment
- Heat exchangers
- Condensers
- Pulp and paper industry
- Off-shore oil drilling companies
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Power generation
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Petrochemicals
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Gas processing
- Specialty chemicals
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