ASTM A335 / ASME SA335 P9 SEAMLESS ALLOY STEEL SMLS PIPE
A335/SA335 P9 is a seamless ferritic alloy-steel pipe used for
high-temperature applications. These pipes are versatile and can be
used to transmit water, oil and natural gas.
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.
ALLOY PIPE CROSS REFERENCE TABLE ASTM vs. EN GRADES
| 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 |
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 |
Mechanical properties:
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
Application:
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:
- Refinery
- Machine building
- Oil and gas
- Power generation
- Petrochemicals
- Gas processing
- Fertilizer
- Sugar
