ASTM A335 pipe(also known as chrome moly pipe) is a seamless ferritic alloy steel pipe for high temperature service，which is popular in grades P5, P9, P11, P22, and P91. ASTM A335 alloy steel pipes have strong corrosion resistance, high tensile strength, high temperature strength and high cost-effectiveness. The most common use of featured grades P11, P22, and P91 of ASTM A335 alloy steel pipe is in the power industry and petro-chemical plants. How much do you know about ASTM A335 pipe? Continue reading to learn more.
Specifications of ASTM A335 Alloy Steel Pipes:
Processing method: hot rolled or cold drawn
Sizes: 1/2” to 24”
Wall thickness: SCH 40, SCH STD, SCH 80, SCH XS, SCH 160
Length: 6 meters, 12 meters or customized.
End: PE (plain end), BE (beveled end)
Heat Treatment Requirements of ASTM A335 Alloy Steel Pipes:
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P5, P9, P11 and P22 |
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Grade |
Heat Treatment Type |
Normalizing Temperature Range F [C] |
Subcritical Annealing |
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P5 (b,c) |
Full or isothermal Anneal |
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|
|
Normalize and Temper |
***** |
1250 [675] |
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Subcritical Anneal (P5c only) |
***** |
1325 - 1375 [715 - 745] |
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P9 |
Full or isothermal Anneal |
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Normalize and Temper |
***** |
1250 [675] |
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P11 |
Full or isothermal Anneal |
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Normalize and Temper |
***** |
1200 [650] |
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P22 |
Full or isothermal Anneal |
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|
|
|
Normalize and Temper |
***** |
1250 [675] |
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P91 |
Normalize and Temper |
1900-1975 [1040 - 1080] |
1350-1470 [730 - 800] |
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Quench and Temper |
1900-1975 [1040 - 1080] |
1350-1470 [730 - 800] |
Chemical Requirements of ASTM A335 Alloy Steel Pipes:
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Grade |
P-5 |
P-9 |
P-11 |
P-22 |
P-91 |
P-91 shall also include the following: |
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Element |
UNS Designation |
K41545 |
S50400 |
K11597 |
K21590 |
K91560 |
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Carbon |
0.15 max |
0.15 max |
0.05 - 0.15 |
0.05 - 0.15 |
0.08 - 0.12 |
V at 0.18 - 0.25 |
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Manganese |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
0.30 - 0.60 |
N at 0.030 - 0.070 |
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Phosphorous, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.020 |
Ni at 0.40 max |
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Sulfur, max |
0.025 |
0.025 |
0.025 |
0.025 |
0.010 |
Al at 0.02 max |
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Silicon |
0.50 max |
0.25 - 1.00 |
0.50 - 1.00 |
0.50 max |
0.20 -0.50 |
Cb at 0.06 - 0.10 |
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|
Chromium |
4.00 - 6.00 |
8.00 - 10.00 |
1.00 - 1.50 |
1.90 - 2.60 |
8.00 - 9.50 |
Ti at 0.01 max |
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|
Molybdenum |
0.45 -0.65 |
0.90 - 1.10 |
0.44 - 0.65 |
0.87 - 1.13 |
0.85 - 1.05 |
Zr at 0.01 max |
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Tensile Requirements of ASTM A335 Alloy Steel Pipes:
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Seamless |
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P-5 |
P-9 |
P-11 |
P-22 |
P-91 |
P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC]. |
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Tensile Strength, min., psi |
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ksi |
60 |
60 |
60 |
60 |
85 |
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MPa |
415 |
415 |
415 |
415 |
585 |
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Yield Strength, min., psi |
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ksi |
30 |
30 |
30 |
30 |
60 |
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MPa |
205 |
205 |
205 |
205 |
415 |
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Tests of ASTM A335 Alloy Steel Pipes:
- Tensile Tests: Transverse and Longitudinal
- Flattening Test
- Hardness Test
- Bend Test
Packaging of ASTM A335 Alloy Steel Pipes:
- Bundles (hexagonal)
- Wooden Boxes
- Crates (steel/wooden)
- Special crates for U-Bend tubes with each radius separated
- Packaging for A335 Grade P5, P9, P11, P22, P91 Alloy Steel Seamless Pipe as per customer's requirements
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