Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater
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Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater
A Black-Coated ASTM A335 P9 Alloy Seamless Steel Pipe is a chromium-molybdenum alloy steel pipe designed for high-temperature and high-pressure service. The pipe body offering excellent high-temperature strength, oxidation resistance, and sulfidation corrosion resistance. The external surface of the pipe undergoes a specialized "phosphating and saponification" treatment, which creates a uniform, adherent black protective coating. This coating primarily serves as temporary anti-corrosion protection during transportation, storage, and installation, and can also act as a lubricant to reduce friction during certain machining or handling processes. It is critical to note that this black coating is not a permanent high-temperature corrosion-resistant layer. It is typically required to be removed prior to the pipe being placed into high-temperature service, in accordance with specific system design and commissioning procedures.
| ASTM/ASME | UNS | JIS G3458 | UNS | BS | DIN 17175 | ISO |
| A335 P9/ SA335 P9 | K90941 | STPA 26 | S50400 | 3604 P1 629-470 | X12CrMo91 | 2604 II TS38 |
1.Chemical & Mechanical Properties
| ASTM A335 P9 Chemical Composition (%) | ||||||
| C | Mn | P | S | Si | Cr | Mo |
|
≤0.15% |
0.3%~0.6% | ≤0.025% |
≤0.025% |
0.25%-1.00% |
8.0%~10.0% |
0.90%~1.10% |
Mechanical Properties
| Tensile Strength ksi/MPa | Yield Strength (0.2% offset) ksi/MPa |
Hardness HBW |
Heat Treatment Requirements
℉/℃
|
| ≥60/415 | ≥30/205 | ≤250 | 1250/675 |
|
Elongation(%)
|
|||
|
Wall Thickness
|
Longitudinal
|
Transverse
|
|
|
in.
|
mm | ||
|
5 ⁄16 (0.312)
|
8 |
30 | 20 |
|
9 ⁄32 (0.281)
|
7.2 | 28 | 19 |
|
1 ⁄4 (0.250)
|
6.4 | 27 | 18 |
|
7 ⁄32 (0.219)
|
5.6 | 26 | ... |
|
3 ⁄16 (0.188)
|
4.8 | 24 | ... |
|
5 ⁄32 (0.156)
|
4 | 22 | ... |
|
1 ⁄8 (0.125)
|
3.2 | 21 | ... |
|
3 ⁄32 (0.094)
|
2.4 | 20 | ... |
|
1 ⁄16 (0.062)
|
1.6 | 18 | ... |
2. Key Adventages
- High-Temperature Strength: With its chromium and molybdenum content, P9 tubes exhibit excellent resistance to oxidation, creep, and deformation even under extreme temperatures.
- Corrosion Resistance: Chromium provides superior resistance to oxidation and scaling, while molybdenum enhances corrosion resistance, particularly in acidic environments; Long service life with reduced maintenance costs.
- Seamless Construction: The seamless design ensures superior strength, uniformity, and durability compared to welded tubes, making it ideal for critical applications.
3. Key Applications
- Food Processing Equipment
- Radiant Tubes
- Coal Gasifier Internal Component
- Oven Linings
- Furnace Parts
- Annealing Cover
- Saggers
- Heat Exchangers
ASTM A335 Grade P9 Pipe Sizes
| O.D. x Thickness(mm) | O.D x Thickness(mm) | O.D x Thickness(mm) |
|---|---|---|
| 38.1 x 3.2 | 57.0 x 4.9 | 76.2 x 4.0 |
| 38.1 x 4.0 | 57.0 x 6.3 | 76.2 x 5.0 |
| 38.1 x 6.3 | 57.0 x 7.9 | 76.2 x 6.3 |
| 42.4 x 3.2 | 60.3 x 3.2 | 82.5 x 4.5 |
| 42.4 x 4.0 | 60.3 x 3.6 | 88.9 x 3.2 |
| 44.5 x 3.2 | 60.3 x 5.0 | 88.9 x 3.6 |
| 44.5 x 6.3 | 63.5 x 3.2 | 88.9 x 4.0 |
| 48.3 x 3.2 | 63.5 x 3.6 | 101.6 x 3.6 |
| 48.3 x 3.6 | 63.5 x 4.0 | 101.6 x 4.5 |
| 50.8 x 4.5 | 63.5 x 6.3 | 101.6 x 6.3 |
| 51.0 x 3.2 | 63.5 x 7.9 | 114.3 x 3.6 |
| 51.0 x 3.6 | 70.0 x 3.2 | 114.3 x 5.0 |
| 51.0 x 6.3 | 70.0 x 3.6 | 139.7 x 4.0 |
| 57.0 x 3.2 | 70.0 x 6.3 | 139.7 x 5.0 |
| 57.0 x 3.6 | 76.2 x 3.6 | 139.7 x 6.3 |
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