Introduction
The ASTM A335 Alloy Steel Pipe is standard specifications for seamless ferritic alloy steel pipes designed for high temperature applications. These pipes are commonly used in power plants, refineries, chemical processing and other industries that must withstand high temperatures and pressures.
Features
High temperature performance
The ASTM A335 Alloy Steel Pipe are made of high-quality low-alloy steel and undergo strict heat treatment (normalizing, tempering, quenching and tempering, etc.) to ensure that the pipe has stable mechanical properties at temperatures up to 600°C or even higher, and is not easy to soften or deform, making it suitable for high-temperature steam and hot fluid transportation.
Excellent pressure resistance
The seamless pipe has a uniform and dense structure, no weld defects, and has extremely high internal pressure resistance and yield strength. It can withstand the high-pressure environment of boilers, heat exchangers and other systems to ensure safe operation.
Strict dimensional control
The product dimensional tolerance is strictly controlled, the outer diameter and wall thickness are uniform, and the length specifications are diverse, ensuring precise coordination with boilers and piping systems, simplifying installation and maintenance.
CHEMICAL COMPOSITION
The types of alloy steel covered by the ASTM A335 – ASME SA335 specification are designed with a "P" prefix, from P5 to P92. Grades P11/P22 and P91/92 are typically found in power stations, whereas grade P5 and P9 are more common for application in the petrochemical industry. Grades P9 and P91 are in the list, the more expensive (a P91 seamless pipe may cost approx 5€ per kg.).
|
ASTM A335 |
UNS |
C≤ |
Mn |
P≤ |
S≤ |
Si≤ |
Cr |
Mo |
|
P1 |
K11522 |
0.10~0.20 |
0.30~0.80 |
0.025 |
0.025 |
0.10~0.50 |
– |
0.44~0.65 |
|
P2 |
K11547 |
0.10~0.20 |
0.30~0.61 |
0.025 |
0.025 |
0.10~0.30 |
0.50~0.81 |
0.44~0.65 |
|
P5 |
K41545 |
0.15 |
0.30~0.60 |
0.025 |
0.025 |
0.5 |
4.00~6.00 |
0.44~0.65 |
|
P5b |
K51545 |
0.15 |
0.30~0.60 |
0.025 |
0.025 |
1.00~2.00 |
4.00~6.00 |
0.44~0.65 |
|
P5c |
K41245 |
0.12 |
0.30~0.60 |
0.025 |
0.025 |
0.5 |
4.00~6.00 |
0.44~0.65 |
|
P9 |
S50400 |
0.15 |
0.30~0.60 |
0.025 |
0.025 |
0.50~1.00 |
8.00~10.00 |
0.44~0.65 |
|
P11 |
K11597 |
0.05~0.15 |
0.30~0.61 |
0.025 |
0.025 |
0.50~1.00 |
1.00~1.50 |
0.44~0.65 |
|
P12 |
K11562 |
0.05~0.15 |
0.30~0.60 |
0.025 |
0.025 |
0.5 |
0.80~1.25 |
0.44~0.65 |
|
P15 |
K11578 |
0.05~0.15 |
0.30~0.60 |
0.025 |
0.025 |
1.15~1.65 |
– |
0.44~0.65 |
|
P21 |
K31545 |
0.05~0.15 |
0.30~0.60 |
0.025 |
0.025 |
0.5 |
2.65~3.35 |
0.80~1.60 |
|
P22 |
K21590 |
0.05~0.15 |
0.30~0.60 |
0.025 |
0.025 |
0.5 |
1.90~2.60 |
0.87~1.13 |
|
P91 |
K91560 |
0.08~0.12 |
0.30~0.60 |
0.02 |
0.01 |
0.20~0.50 |
8.00~9.50 |
0.85~1.05 |
|
P92 |
K92460 |
0.07~0.13 |
0.30~0.60 |
0.02 |
0.01 |
0.5 |
8.50~9.50 |
0.30~0.60 |
MECHANICAL PROPERTIES
|
A335 Low-Alloy Pipe |
UNS Number |
Yield Strength ksi |
Tensile Strength ksi |
Elongation % |
Rockwell |
Brinell |
|
P1 |
K11522 |
30 |
55 |
30 |
– |
– |
|
P2 |
K11547 |
30 |
55 |
30 |
– |
– |
|
P5 |
K41545 |
40 |
70 |
30 |
– |
207 max |
|
P9 |
S50400 |
30 |
60 |
30 |
– |
– |
|
P11 |
K11597 |
30 |
60 |
20 |
– |
– |
|
P12 |
K11562 |
32 |
60 |
30 |
– |
174 max |
|
P22 |
K21590 |
30 |
60 |
30 |
– |
– |
|
P91 |
K91560 |
60 |
85 |
20 |
– |
– |
TOLERANCES
|
A335 Pipe |
Over |
Under |
||
|
NPS [DN] |
in. |
mm |
in. |
mm |
|
1/8 to 1 1/2 / DN 6 to 40 |
1/64 (0.015) |
0.4 |
1/64 (0.015) |
0.4 |
|
Over 1 1/2 to 4 / DN 40 to 100 |
1/32 (0.031) |
0.79 |
1/32 (0.031) |
0.79 |
|
Over 4 to 8 / DN 100 to 200 |
1/16 (0.062) |
1.59 |
1/32 (0.031) |
0.79 |
|
Over 8 to 12 / DN 200 to 300 |
3/32 (0.093) |
2.38 |
1/32 (0.031) |
0.79 |
|
Over 12 / > DN 300 |
+/- 1% of the specified outside diameter |
DIAMETER
The tolerances in WT, in %, from specified are:
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios: over 20%, under 12.5%
Above 2 1/2 [65], t/D < or = 5%: over 22.5%, under 12.5%
Above 2 1/2 [65], t/D > 5%: over 15%, under 12.5%
t = Specified Wall Thickness; D = Specified Outside Diameter)
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 |
FAQ
Q: What is ASTM A335 Alloy Steel Pipe used for?
A: ASTM A335 alloy steel pipes are designed for high-temperature and high-pressure service in power plants, petrochemical facilities, refineries, and industrial process systems. They're commonly used in steam lines, superheaters, and heat exchangers.
Q: What grades are available under ASTM A335, and how do they differ?
A: Common grades include P1, P5, P9, P11, P22, and P91. The differences lie in their chemical composition and mechanical properties. For example, P91 offers higher creep strength for long-term high-temperature service, while P11 and P22 are often used in power boilers and heat exchangers.
Q: Why choose seamless construction for ASTM A335 pipes?
A: Seamless pipes offer uniform strength, no weld defects, and better performance under pressure and thermal stress, making them more reliable for critical applications in high-temperature environments.
Q: What testing and quality standards apply to ASTM A335 pipes?
A: ASTM A335 requires strict testing, including chemical analysis, mechanical testing (tensile, hardness), non-destructive testing, and hydrostatic testing. These ensure the pipe meets the required strength, durability, and dimensional tolerances.
Q: Can ASTM A335 alloy steel pipes be customized in size and delivery?
A: Yes. Manufacturers typically offer a wide range of outer diameters, wall thicknesses, and lengths. Custom cutting, beveling, and surface treatments are available, along with third-party inspection and documentation as per project requirements.
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