Alloy steel pipe is a tubular product made of steel with alloying elements in addition to carbon to enhance its mechanical and chemical properties. Carbon is the primary hardening element in steel, while the addition of elements such as chromium, molybdenum, nickel, and vanadium allows manufacturers to adjust the pipe's strength, hardness, toughness, corrosion resistance, and high-temperature performance.
Alloy steel pipe is suitable for various operating environments, such as water pipes requiring corrosion protection, oil pipes requiring oxidation resistance, and environments exposed to high-temperature transients up to 3000°C for 0.006 seconds.
|
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: 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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