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ASTM A335 / ASME SA335 Pipe named chrome moly pipe as they have a high level of Chromium and Molybdenum.
Chromium will increase oxidation resistance and provides high-temperature strength, along with the better tensile & yield strength and proper hardness at room temperature. When the chromium levels are above 12%, it can be classified as stainless steel.
Molybdenum increases the overall strength, resistance, elasticity, hardenability and overall quality, moly ensures that the material is more resistant to softening, restrains the growth of grains and lessens the chances of embrittlement. It is the single additive that is responsible for the increase in high temperature resistance (to 540-750°C) and it also improves the corrosion resistance to steel.
Key to the composition of chrome moly alloy P9 is the addition of
chromium and molybdenum. Chromium, or chrome, improves
high-temperature strength, increases oxidation resistance and
raises the tensile, yield and hardness at room temperatures.
Molybdenum increases the strength, elastic limit, resistance to
wear, impact qualities and hardenability. It increases the
resistance to softening, restrains grain growth and makes chromium
steel less susceptible to embrittlement. Moly is also the most
effective additive for increasing high temperature creep strength,
or creep resistance. It also enhances the corrosion resistance of
steel and inhibits pitting.
Both these elements are known to improve the pipe’s resistance to wear, its impact qualities, hardenability, as well as its elastic limit. They also cause an increase in its mechanical properties like: the prevention of grain growth, reduced brittleness, the increase the creep strength at high temperatures and has excellent resistance to softening.
The chromium content in the a335 p9 pipe makes it highly resistant to corrosion. Therefore, the a335 p9, has excellent resistance to oxidation at elevated temperature. Besides chromium, astm a335 p9 alloy steel pipes that are externally coated with either Black oil paint or anti-corrosion oil show good resistance to corrosion. It could also be galvanized with zinc. Galvanization with zinc increases its resistance to atmospheric corrosion.
A335 P9 Pipes may be manufactured by forming them either through hot finishing or cold drawing. After forming, the pipes have to be finished with heat treatment that includes Full or Isothermal Annealing, Normalizing and Tempering. There are four types of sa335 grade p9 pipes that are manufactured - Welded, Fabricated, Seamless and ERW. The pipes are available in threaded ends, plain ends or bevel end. And both the ends of these pipes are protected by plastic caps. The asme sa335 grade p9 pipes and tubes are manufactured in several forms like – rectangle, coiled, round, square, hydraulics, U-shaped and pancake coils.
| Chrome Moly Pipes: Werkstoff vs EN vs ASTM | ||
|---|---|---|
| Werkstoff /DIN | EN | ASTM |
| 1.5415 | 16Mo3 | A335 Grade P1 |
| 1.7335 | 13CrMo4-5 | A335 Grade P11, P12 |
| 1.7380 | 10CrMo9-10 | A335 Grade P22 |
| 1.7362 | X11CrMo5 | A335 Grade P5 |
| A335 Grade P9 | ||
| 1.4903 | X10CrMoVNb9-1 | A335 Grade P91 |
| 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 |
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
A335/SA335 Seamless P9 pipe is often used in the oil and natural gas industry due to its high strength. P9’s great performance properties make it suitable for energy-related applications. P5 is suitable for:
