Overview
ASTM A335 P9 is a specialized seamless ferritic alloy steel pipe
for high-temperature service. It is commonly used in power plants
and petrochemical industries for applications requiring
high-temperature resistance and toughness. The chemical composition
includes chromium, molybdenum, and vanadium, which provide
excellent corrosion resistance, high strength, and good
weldability. ASTM A335 P9 has a maximum working temperature of
600°C and a maximum operating pressure of 65 bar.
Molybdenum Feature
The A335 pipes has a high level of Chromium and Molybdenum presence
in it. While 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 and it also improves the corrosion
resistance to steel
ASTM A335 Feature
High-temperature resistance: ASTM A335 seamless steel pipe is
designed to withstand high temperatures up to 600°C (1112°F),
making it an ideal material for high-temperature applications such
as steam pipelines and heat exchangers.
Corrosion resistance: ASTM A335 seamless steel pipe exhibits good
corrosion resistance in aggressive environments, such as those
found in chemical processing and oil and gas industries.
High strength: ASTM A335 seamless steel pipe has high tensile
strength and yield strength, making it ideal for use in
high-pressure applications. Good weldability: ASTM A335 seamless
steel pipe can be easily welded using traditional methods, with no
need for preheating or post-weld heat treatment.
Uniform properties: ASTM A335 seamless steel pipe is produced using
a consistent manufacturing process, ensuring that each pipe has
uniform properties and quality.
Cost-effective: Despite its superior properties, ASTM A335 seamless
steel pipe remains an affordable option for high-temperature
applications.
Chemical Composition
| Grade | UNS | C≤ | Mn | P≤ | S≤ | Si≤ | Cr | Mo |
|
| P9 | S50400 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 8-10.00 | 0.44-0.65 |
Mechanical Properties
| Mechanical properties | Tensile, min, ksi[MPa] | Yield,min, ksi[MPa] | Elongation, %(min) | Hardness, HB(max) |
| P9 | 60[415] | 30[205] | 30 | - |
Elongation
Elongation in 2 in or 50mm or 4D minimum%:
For wall thickness 5/16 in [8mm] and over: Longitudinal 30% and
Transverse 20%.
Elongation smaller 2 in or 50mm or 4D minimum%:
For wall thickness 5/16 in [8mm] and over: Longitudinal 22% and
Transverse 14%.
For strip tests a deduction of each 0.8mm below 8mm shall be
calculated with the Table 5 in ASTM A335.
Test
Tensile tests: Transverse and Longitudinal
Flattening test of ASTM A999/A999M
Hardness test not exceeding 250 HBW/265 HV30 [25HRC]
Bend Test shall be carried as per ASTM A370
Hydrostatic Test is required, depending on the buyer’s decision
both Hydrostatic test and a nondestructive test could be carried
out.
Use
power plants and chemical plants
construction of industrial furnaces
aerospace industry
medical field
food processing industry
coins and medals
electrical components
Advantage
1.Withstand high temperatures and has good corrosion resistance.
2. biocompatible and can be used in implants and other medical
devices.
3.non-toxic
Package Process
1.with plastic cap to protect both ends
2.weaving bag wrapped outside the pipe
3.then pack into wooden case.
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