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Forever Steel supplies alloy seamless steel pipe for high-temperature piping, including ASTM A335 / ASME SA335 P11, P22, P5, P9, P91 and P92. Confirm the standard and edition, grade/type, NPS or OD, schedule or wall thickness, length, quantity and inspection documents; availability depends on the complete grade × size × wall × length combination.
Confirm the product form and governing specification before comparing offers:
ASTM A335 (ASME SA335): The "Chrome-Moly" pipe standard for high-temperature service.
Common Grades: P5, P9, P11, P22, P91, P92.
ASTM A213 (ASME SA213): Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.
Common Grades: T5, T9, T11, T22, T91.
Pipe versus tube: A335 P11/P22/P91 pipe and A213 T11/T22/T91 tubing have different product specifications and dimensional/order requirements. Similar alloy-family names do not make them interchangeable.
DIN 17175: Heat-resistant seamless steel tubes.
Common Grades: 13CrMo44, 10CrMo910.
EN 10216-2: Seamless steel tubes for pressure purposes.
Common Grades: 16Mo3, 13CrMo4-5.
The catalogue envelope below is a starting point for inquiry. The maximum diameter, wall and length must not be assumed available together for every grade; confirm mill capability and delivery conditions for the requested line item:
|
Feature |
Specification Range |
|
Nominal Pipe Size (NPS) |
NPS 1/4–36; corresponding OD approximately 13.7–914.4 mm |
|
Wall Thickness (WT) |
SCH 40, SCH 80, SCH 160, SCH XXS (up to 100mm for heavy wall) |
|
Length |
Single Random, Double Random, or Fixed Length (up to 23m) |
|
Surface Treatment |
Bare, Black Painting, Anti-corrosion Oil, or Galvanized |
|
End Preparation |
Beveled Ends (BW), Plain Ends (PE), or Threaded & Coupled |
Typical applications include main steam lines, reheater piping, boiler tubes, refinery heater tubes, heat exchangers, chemical process piping and high-pressure industrial piping.
Power Generation: Main steam lines, reheat piping, and superheater tubes in thermal power plants.
Petrochemical & Refining: High-temperature furnace tubes, heat exchangers, and catalytic cracking units.
Chemical Processing: Transporting corrosive media and high-pressure chemical reactions.
Boiler Manufacturing: High-pressure boiler tubes and headers.
Oil & Gas: Project-specified process piping. Corrosive or hydrogen-containing duty requires a separate materials review; an A335 grade alone does not establish suitability.
| Requested grade | Confirm in the purchase specification |
|---|---|
| P11 | Approved 1.25Cr-0.5Mo piping basis, delivery heat treatment, size and required records. |
| P22 | Approved 2.25Cr-1Mo piping basis; confirm substitution approval if the original specification names another grade. |
| P91 | Exact edition/type, delivery condition and heat-treatment traceability; separate pipe release from fabrication welding/PWHT approval. |
For the differences in composition and selection, use the P11, P22 and P91 material comparison. The quotation should identify the offered mill, grade, dimensional basis, delivery condition, end finish, inspection scope, certificate type and any deviations.
Release documents to agree: MTC linked to heat/pipe identification; specified heat-treatment and test results; dimensional inspection; and any additional PMI, hardness, NDE, hydrotest or third-party witness records required by the order. Confirm the test method, extent and acceptance criteria before production or stock release.
· ASTM A335 P11 vs P22 vs P91 Technical Comparison
· Alloy Steel Pipe Standards and Grade Selection Guide
· Chemical Plant Process Piping: MTC, NDT and Coating Checks
| Nominal Diameter | OD(MM) | WALL THICKMESS(MM) | |||||||||||||||||
| ANSI B36.10M | ANSI B36.19M | ||||||||||||||||||
| A(MM) | B(INCH) | ASME | SCH5/5S | SCH10S | SCH10 | SCH20 | SCH30 | STD | SCH40 | SCH40S | SCH60 | XS | SCH80 | SCH80S | SCH100 | SCH120 | SCH140 | SCH160 | XXS |
| 15 | 1/2" | 21.34 | 1.65 | 2.11 | 2.11 | 2.41 | 2.77 | 2.77 | 2.77 | 3.73 | 3.73 | 3.73 | 4.78 | 7.47 | |||||
| 20 | 3/4" | 26.67 | 1.65 | 2.11 | 2.11 | 2.41 | 2.87 | 2.87 | 2.87 | 3.91 | 3.91 | 3.91 | 5.56 | 7.82 | |||||
| 25 | 1" | 33.40 | 1.65 | 2.77 | 2.77 | 2.9 | 3.38 | 3.38 | 3.38 | 4.55 | 4.55 | 4.55 | 6.35 | 9.09 | |||||
| 32 | 1.1/4" | 42.16 | 1.65 | 2.77 | 2.77 | 2.97 | 3.56 | 3.56 | 3.56 | 4.85 | 4.85 | 4.85 | 6.35 | 9.7 | |||||
| 40 | 1.1/2" | 48.26 | 1.65 | 2.77 | 2.77 | 3.18 | 3.68 | 3.68 | 3.68 | 5.08 | 5.08 | 5.08 | 7.14 | 10.15 | |||||
| 50 | 2" | 60.32 | 1.65 | 2.77 | 2.77 | 3.18 | 3.91 | 3.91 | 3.91 | 5.54 | 5.54 | 5.54 | 8.74 | 11.07 | |||||
| 65 | 2.1/2" | 73.02 | 2.11 | 3.05 | 3.05 | 4.78 | 5.16 | 5.16 | 5.16 | 7.01 | 7.01 | 7.01 | 9.53 | 14.02 | |||||
| 80 | 3" | 88.90 | 2.11 | 3.05 | 3.05 | 4.78 | 5.49 | 5.49 | 5.49 | 7.62 | 7.62 | 7.62 | 11.13 | 15.25 | |||||
| 90 | 3.1/2" | 101.60 | 2.11 | 3.05 | 3.05 | 4.78 | 5.74 | 5.74 | 5.74 | 8.08 | 8.08 | 8.08 | |||||||
| 100 | 4" | 114.30 | 2.11 | 3.05 | 3.05 | 4.78 | 6.02 | 6.02 | 6.02 | 8.56 | 8.56 | 8.56 | 11.13 | 13.49 | 17.12 | ||||
| 125 | 5" | 141.30 | 2.77 | 3.40 | 3.40 | 6.55 | 6.55 | 6.55 | 9.53 | 9.53 | 9.53 | 12.7 | 15.88 | 19.05 | |||||
| 150 | 6" | 168.28 | 2.77 | 3.40 | 3.40 | 7.11 | 7.11 | 7.11 | 10.97 | 10.97 | 10.97 | 14.27 | 18.26 | 21.95 | |||||
| 200 | 8" | 219.08 | 2.77 | 3.76 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 8.18 | 10.31 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 |
| 250 | 10" | 273.05 | 3.40 | 4.19 | 4.19 | 6.35 | 7.8 | 9.27 | 9.27 | 9.27 | 12.7 | 12.7 | 15.09 | 12.7 | 18.26 | 21.44 | 25.4 | 28.58 | 25.4 |
| 300 | 12" | 323.85 | 3.96 | 4.57 | 4.57 | 6.35 | 8.38 | 9.53 | 10.31 | 9.53 | 14.27 | 12.7 | 17.48 | 12.7 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 |
| 350 | 14" | 355.60 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 9.53 | 15.09 | 12.7 | 19.05 | 12.7 | 23.83 | 27.79 | 31.75 | 35.71 | |
| 400 | 16" | 406.40 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | 9.53 | 12.7 | 9.53 | 16.66 | 12.7 | 21.44 | 12.7 | 26.19 | 30.96 | 36.53 | 40.49 | |
| 450 | 18" | 457.20 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | 9.53 | 19.05 | 12.7 | 23.83 | 12.7 | 29.36 | 34.93 | 39.67 | 45.24 | |
| 500 | 20" | 508.00 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 15.09 | 9.53 | 20.62 | 12.7 | 26.19 | 12.7 | 32.54 | 38.1 | 44.45 | 50.01 | |
| 550 | 22" | 558.80 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | 9.53 | 22.23 | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | ||||
| 600 | 24" | 609.60 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | 9.53 | 24.61 | 12.7 | 30.96 | 12.7 | 38.89 | 46.02 | 52.37 | 59.54 | |
| 650 | 26" | 660.40 | 7.92 | 12.7 | 9.53 | 12.7 | |||||||||||||
| 700 | 28" | 711.20 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | ||||||||||||
| 750 | 30" | 762.00 | 6.35 | 7.92 | 12.7 | 15.88 | 9.53 | 12.7 | |||||||||||
| 800 | 32" | 812.00 | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | 12.7 | |||||||||||
| 850 | 34" | 863.60 | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | 12.7 | |||||||||||
| 900 | 36" | 914.40 | 7.92 | 12.7 | 15.88 | 9.53 | 19.05 | 12.7 | |||||||||||
Selected reference chemistry, mass %. The published historical ASTM A335/A335M-11 table provides the comparison basis; this is not a complete acceptance table for every current grade/type. Check the contract edition, applicable P91 type, all required elements and residual limits against the MTC. See the P11/P22/P91 composition comparison and source notes.
| Element | Grade P11 | Grade P22 | Grade P5 | Grade P9 | Grade P91 |
| Carbon | 0.05–0.15 | 0.05–0.15 | 0.15 max | 0.15 max | 0.08–0.12 |
| Manganese | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| Phosphorus (max) | 0.025 | 0.025 | 0.025 | 0.025 | 0.02 |
| Sulfur (max) | 0.025 | 0.025 | 0.025 | 0.025 | 0.01 |
| Silicon | 0.50–1.00 | 0.50 max | 0.50 max | 0.25–1.00 | 0.20–0.50 |
| Chromium | 1.00–1.50 | 1.90–2.60 | 4.00–6.00 | 8.00–10.00 | 8.00–9.50 |
| Molybdenum | 0.44–0.65 | 0.87–1.13 | 0.45–0.65 | 0.90–1.10 | 0.85–1.05 |
| Vanadium | ... | ... | ... | ... | 0.18–0.25 |
Confirm the ordered nominal-wall or minimum-wall basis and the applicable standard tolerances in the quotation. The abbreviated chart below must not be used to apply a nominal-wall under-tolerance to a guaranteed minimum wall, or to override the purchase specification.
| Nominal Pipe Size (NPS) | OD Tolerance (Over) | OD Tolerance (Under) | Wall Thickness (WT) Tolerance | Length Tolerance | ||
| Single Random (SRL) | Double Random (DRL) | Fixed Length | ||||
| 1/8" to 1-1/2" | +0.4 mm (1/64") | -0.8 mm (1/32") | -12.5% (Min. Wall) | ± 500mm | ± 500mm | +6mm / -0mm |
| Over 1-1/2" to 4" | +0.8 mm (1/32") | -0.8 mm (1/32") | -12.5% (Min. Wall) | |||
| Over 4" to 8" | +1.6 mm (1/16") | -0.8 mm (1/32") | -12.5% (Min. Wall) | |||
| Over 8" to 18" | +2.4 mm (3/32") | -0.8 mm (1/32") | -12.5% (Min. Wall) | |||
| Over 18" to 36" | +3.2 mm (1/8") | -0.8 mm (1/32") | -12.5% (Min. Wall) | |||
| Property | P11, P22, P5, P9 | Grade P91 | Grade P92 |
| Tensile Strength (min) | 415 MPa (60 ksi) | 585 MPa (85 ksi) | 620 MPa (90 ksi) |
| Yield Strength (min) | 205 MPa (30 ksi) | 415 MPa (60 ksi) | 440 MPa (64 ksi) |
| Elongation (Longitudinal) | 30% | 20% | 20% |
| Hardness (max) | 163 HB / 85 HRB | 250 HB / 25 HRC | 250 HB / 25 HRC |
Send the standard and edition, grade/type, NPS or OD, schedule or wall thickness and wall basis, length, quantity, ends, required delivery date and destination. Attach the piping specification and inspection/document requirements. An unclear size, heat-treatment condition or test scope should be resolved before comparing prices.
A proposed replacement needs approval from the responsible engineer or specification owner. Chemistry alone is insufficient: check code acceptance, allowable stress, wall thickness, service environment and fabrication requirements. We should quote the specified grade or clearly identify a proposed deviation.
State the required EN 10204 certificate type and any third-party witness points in the order. Request heat traceability, the specified delivery heat-treatment records and applicable mechanical/chemical test results. Define additional PMI, hardness, NDE and hydrotest scope in the approved inspection plan; ET or MT should not be treated as interchangeable methods.
Review the material identity, delivery condition, inspection results and any open deviations before release. Match pipe marking to the MTC and packing list, protect bevels and ends, and agree preservation and loading requirements. The pipe release dossier does not replace the fabricator’s welding and PWHT records.
