Overview
Alloy steel pipe is a kind of seamless steel pipe, which is made by
hot rolling (extrusion, expansion) or cold rolling (drawing). Its
performance is much higher than the general seamless steel pipe,
because this steel pipe inside containing Cr. Alloy steel pipe is
mainly used in high-pressure and high-temperature pipelines and
equipment such as power plants, nuclear power, high-pressure
boilers, high-temperature superheaters and reheaters. The
advantages of alloy steel pipes can be 100% recycled, which is
environmental protection and energy saving. ASTM A335 Alloy Pipe is
often called as chrome moly pipe because of the chemical contain of
Molybdenum (Mo) and Chromium (Cr). ASTM A335 Alloy Pipe is the
seamless ferritic Pipe for high temperature service.
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
Application
Fluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, OIL
PIPE, Chemical Fertilizer Pipe, Structure Pipe
Chemical Composition
| Grade | C≤ | Mn | P≤ | S≤ | Si≤ | Cr | Mo |
|
| P5 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.5 | 4.00-6.00 | 0.44-0.65 |
Mechanical Properties
| Mechanical properties | Tensile, min, ksi[MPa] | Yield,min, ksi[MPa] | Elongation, %(min) | Hardness, HB(max) |
| P5 | 60[415] | 30[205] | 30 | - |
Elongation
For wall thickness 5/16 in [8mm] and over:
Elongation in 2 in or 50mm or 4D minimum%: Longitudinal 30% and
Transverse 20%.
Elongation smaller 2 in or 50mm or 4D minimum%: Longitudinal 22%
and Transverse 14%.
For strip tests a deduction of each 0.8mm below 8mm shall be
calculated as below:
8mm, Longitudinal 30%, Transverse 20%;
7.2mm, 28% & 19%;
6.4mm, 27% & 18%;
5.6mm, 26% & 18%.
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.
Heat Treatment
ASTM A335 P5 shall be heat treated with full or isothermal anneal
or normalize and temper or subcritical anneal, temperature 675℃
Heat Resistance
A335 Grade P5 is known for its remarkable heat-resistant qualities,
making it an ideal material for high-temperature applications. It
offers superior properties compared to conventionally used
materials such as carbon steel, providing significantly more
efficient thermal management in the long run. It also exhibits good
toughness and fatigue resistance characteristics, good creep
strength, and excellent structural stability, making it a popular
choice for numerous engineering projects. With its combination of
corrosion, abrasion and impact resistance qualities, grade P5
alloys can be applied in various challenging environments. This
gives engineers enhanced flexibility to create unique designs that
excel in even the harshest conditions.
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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