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Alloy Seamless Steel Pipe for High-Temperature and Pressure Piping
Our Alloy Seamless Steel Pipes are engineered for high-temperature, high-pressure, and corrosive environments where carbon steel may not meet project temperature. By incorporating elements like Chromium, Molybdenum, and Nickel, these pipes offer superior mechanical properties, creep resistance, and durability. Whether for power generation or refinery processes, our alloy piping ensures pressure or alloy requirements.
We provide a wide range of low-alloy and high-alloy seamless pipes following international benchmarks:
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.
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.
Dimensions and Technical Specifications
We offer customized sizing and heavy-wall options to meet specific engineering drawings:
|
Feature |
Specification Range |
|
Outer Diameter (OD) |
1/4” to 36” (13.7mm – 914.4mm) |
|
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 12m or 15m) |
|
Surface Treatment |
Bare, Black Painting, Anti-corrosion Oil, or Galvanized |
|
End Preparation |
Beveled Ends (BW), Plain Ends (PE), or Threaded & Coupled |
Core Application Fields
Alloy seamless pipes are the backbone of critical infrastructure and heavy industry:
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: Downhole tools and high-sulfur environment transport.
Chemical composition
| 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 | 2.00–2.50 | 4.00–6.00 | 8.00–9.50 | 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 |
Dimention Tolerance
| 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 |
SPECIFICATION STANDARD (STEEL PIPE)
| Normal 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 | |||||||||||
Alloy Smls Steel Pipe Production Process
We implement internal quality control from raw material review to final shipment release. For orders related to power plant piping, refinery heaters, and high-temperature steam service, buyers usually expect the product to match both the application and the supporting ASTM A335 P11, P22, alloy seamless steel pipe, ET, MT, and heat treatment control requirements.
Yes. We can provide Mill Test Certificates according to EN 10204 3.1, and 3.2 can be arranged when required. Third-party inspection by agencies such as SGS, BV, or ABS can also be accepted before shipment.
We use export-oriented packing and loading methods based on the product type, including end protection, stable bundling or blocking, waterproof wrapping where needed, and careful loading control. The goal is to reduce rust, scratches, bevel damage, face damage, coating damage, thread damage, or handling impact during domestic transport and long sea shipment.
This product is commonly supplied for power plant piping, refinery heaters, and high-temperature steam service, with buyer demand often tied to ASTM A335 P11, P22, alloy seamless steel pipe, ET, MT, and heat treatment control.
Chemical composition
| 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 | 2.00–2.50 | 4.00–6.00 | 8.00–9.50 | 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 |
Dimention Tolerance
| 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 |
SPECIFICATION STANDARD (STEEL PIPE)
| Normal 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 | |||||||||||
Alloy Smls Steel Pipe Production Process
We implement internal quality control from raw material review to final shipment release. For orders related to power plant piping, refinery heaters, and high-temperature steam service, buyers usually expect the product to match both the application and the supporting ASTM A335 P11, P22, alloy seamless steel pipe, ET, MT, and heat treatment control requirements.
Yes. We can provide Mill Test Certificates according to EN 10204 3.1, and 3.2 can be arranged when required. Third-party inspection by agencies such as SGS, BV, or ABS can also be accepted before shipment.
We use export-oriented packing and loading methods based on the product type, including end protection, stable bundling or blocking, waterproof wrapping where needed, and careful loading control. The goal is to reduce rust, scratches, bevel damage, face damage, coating damage, thread damage, or handling impact during domestic transport and long sea shipment.
This product is commonly supplied for power plant piping, refinery heaters, and high-temperature steam service, with buyer demand often tied to ASTM A335 P11, P22, alloy seamless steel pipe, ET, MT, and heat treatment control.
