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ASME SA335 Seamless Ferritic Alloy Steel Pipe for High Temperature Service
Website: | Email: yjhtrade@gmail.com | WhatsApp: +86 15106174543
Product Overview
ASME SA335 / ASTM A335 seamless ferritic alloy steel pipe is the industry standard for high temperature service in power plants, refineries, and petrochemical facilities. These chrome-moly (Cr-Mo) alloy pipes provide superior oxidation resistance, creep strength, and corrosion resistance at elevated temperatures where carbon steel pipes cannot operate .
Key Characteristics:
Chromium (Cr) provides: Oxidation and corrosion resistance, scale resistance at high temperatures
Molybdenum (Mo) provides: High-temperature strength, creep resistance, hardenability
Available Grades:
| Grade | Type | Application |
|---|---|---|
| P11 | 1.25Cr-0.5Mo | General high temperature – most popular |
| P22 | 2.25Cr-1Mo | High pressure steam mains – industry standard |
| P91 | 9Cr-1Mo-V | Supercritical boilers – advanced creep strength |
| P92 | 9Cr-0.5Mo-1.8W-V | Ultra-supercritical – highest temperature capability |
| P5 | 5Cr-0.5Mo | Refinery heaters – high oxidation resistance |
| P9 | 9Cr-1Mo | Severe oxidation service |
✅ ASME SA335 / ASTM A335 certified – Compliant with ASME Boiler & Pressure Vessel Code Section II
✅ Seamless construction – No weld seam – essential for high temperature/pressure integrity
✅ Chrome-Moly (Cr-Mo) alloy – Chromium for oxidation resistance; Molybdenum for creep strength
✅ Elevated temperature capability – Up to 620°C (1150°F) for advanced grades
✅ 100% NDT and hydrostatic tested – Guaranteed integrity for high pressure service
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | ASME SA335 / ASTM A335 |
| ASME Code | Boiler & Pressure Vessel Code Section II |
| Product Type | Seamless Ferritic Alloy Steel Pipe – High Temperature Service |
| Grades | P5, P9, P11, P12, P22, P91, P92 |
| Size Range | 1/2″ – 24″+ (DN15 – DN600+) |
| Wall Thickness | Schedule 10 – Schedule 160, XXS (as per ASME B36.10) |
| Length | 4m – 12m (fixed or random) |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
Chemical Composition – ASME SA335 Grades
| Grade | C | Si | Mn | P max | S max | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| P11 | 0.05-0.15 | 0.50-1.00 | 0.30-0.60 | 0.025 | 0.025 | 1.00-1.50 | 0.44-0.65 | — |
| P22 | 0.05-0.15 | ≤0.50 | 0.30-0.60 | 0.025 | 0.025 | 1.90-2.60 | 0.87-1.13 | — |
| P91 | 0.08-0.12 | 0.20-0.50 | 0.30-0.60 | 0.020 | 0.010 | 8.00-9.50 | 0.85-1.05 | V 0.18-0.25, Nb 0.06-0.10, N 0.030-0.070 |
| P92 | 0.07-0.13 | ≤0.50 | 0.30-0.60 | 0.020 | 0.010 | 8.50-9.50 | 0.30-0.60 | W 1.50-2.00, V 0.15-0.25, Nb 0.04-0.09, B 0.001-0.006 |
💡 P91 and P92 have tighter P/S limits (0.020/0.010) for improved toughness, with vanadium (V) and niobium (Nb) for precipitation strengthening.
Mechanical Properties – ASME SA335 Grades
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB max) |
|---|---|---|---|---|
| P11 | ≥415 | ≥205 | ≥30 | — |
| P22 | ≥415 | ≥205 | ≥30 | — |
| P91 | ≥585 | ≥415 | ≥20 | 250 |
| P92 | ≥620 | ≥440 | ≥20 | 250 |
💡 P91 provides approximately 100% higher yield strength than P22 at room temperature – enabling thinner walls and lighter piping systems.
Grade Selection Guide – Temperature & Pressure
| Grade | Cr (%) | Mo (%) | Max Temp (°C) | Max Temp (°F) | Typical Application | Cost |
|---|---|---|---|---|---|---|
| P11 | 1.25 | 0.5 | 538 | 1000 | General high temperature – most common | $$ |
| P22 | 2.25 | 1.0 | 565 | 1050 | High pressure steam mains – industry standard | $$ |
| P91 | 9.0 | 1.0 | 593 | 1100 | Supercritical boilers – advanced creep strength | $$$ |
| P92 | 9.0 | 0.5 | 620 | 1150 | Ultra-supercritical – highest creep strength | $$$$ |
| P5 | 5.0 | 0.5 | 593 | 1100 | Refinery heaters – high oxidation | $$ |
| P9 | 9.0 | 1.0 | 593 | 1100 | Severe oxidation | $$ |
💡 P11 and P22 are the two most widely used alloy pipe grades globally. P91 dominates modern supercritical boiler applications.
Elevated Temperature Creep Strength Comparison
| Grade | 550°C (1022°F) | 600°C (1112°F) |
|---|---|---|
| P22 | Base reference | Not recommended |
| P91 | 141 MPa | 98 MPa |
| P92 | 199 MPa | 131 MPa |
💡 P92 provides ~40% higher creep strength than P91 at 600°C – enabling operation at up to 620°C (1150°F) for ultra-supercritical power plants.
Applications – High Temperature Service
| Industry | Application | Recommended Grade | Service Temp |
|---|---|---|---|
| Power Generation | Main steam lines (subcritical) | P22 | 540-565°C |
| Power Generation | Superheater headers | P11, P22 | 500-565°C |
| Power Generation | Hot reheat lines | P11, P22 | 500-565°C |
| Supercritical Power | Main steam lines | P91 | 570-593°C |
| Ultra-Supercritical Power | Main steam lines | P92 | 600-620°C |
| Refineries | Heater transfer lines | P5, P9 | Up to 593°C |
| Refineries | Hydrodesulfurization (HDS) | P22, P91 | Up to 565°C |
| Petrochemical | Cracking furnace tubes | P5, P9 | Up to 593°C |
Available Sizes – High Temperature Alloy Pipe
| NPS (inch) | OD (mm) | Schedules Available | Common Grades | Application |
|---|---|---|---|---|
| 1/2″ – 2″ | 21.3-60.3 | SCH40, SCH80, SCH160 | P11, P22 | Small bore piping |
| 3″ – 8″ | 88.9-219.1 | SCH10 – SCH160 | P11, P22, P91 | General process |
| 10″ – 12″ | 273.1-323.9 | SCH40 – SCH160 | P22, P91 | Main steam lines – most common |
| 14″ – 18″ | 355.6-457.2 | SCH20 – SCH80 | P22, P91 | Steam headers |
| 20″ – 24″ | 508.0-610.0 | SCH20 – SCH60 | P22 | Large steam mains |
💡 Most popular sizes: 10″ and 12″ Schedule 80 and Schedule 120 for main steam lines.
Heat Treatment Requirements
| Grade | Required Heat Treatment | Temperature Range | Purpose |
|---|---|---|---|
| P11, P22 | Fully annealed or isothermal annealed | 1,450-1,650°F (790-900°C) | Soften for forming, stress relief |
| P91 | Normalize + Temper (N+T) | Normalize: 1,900-1,975°F (1040-1080°C) | Achieve martensitic structure for high strength |
| P92 | Normalize + Temper (N+T) | Temper: 1,350-1,450°F (730-760°C) | Achieve tempered martensite |
💡 P91 and P92 require strict heat treatment control – normalized + tempered condition is essential for creep resistance.
Quality Assurance & Testing
| Test | Method | Coverage | Importance |
|---|---|---|---|
| Ultrasonic Testing (UT) | ASTM E213 | 100% | Detects internal defects |
| Hydrostatic Test | Water pressure | 100% | Pressure integrity |
| Tensile Test | ASTM E8 | Per heat | Strength verification |
| Hardness Test | Brinell/Rockwell | Per lot | P91/P92 ≤250 HB |
| Flattening Test | Ductility | Per lot | Formability verification |
| Dimensional Inspection | Micrometer | 100% | Size verification |
💡 100% ultrasonic testing is standard for ASME SA335 – critical for detecting internal defects in alloy steel.
Welding Recommendations – Chrome-Moly Grades
| Grade | Preheat Required | PWHT Required | Low Hydrogen Required | Filler Metal |
|---|---|---|---|---|
| P11 | 150-200°C | Required | Required | ER80S-B2 |
| P22 | 150-200°C | Required | Required | ER90S-B3 |
| P91 | 200-260°C | Required | Required | ER90S-B9 |
| P92 | 200-260°C | Required | Required | ERNiCrMo-1 |
⚠️ Chrome-moly alloys require preheat and PWHT – failure to follow proper welding procedures can cause hydrogen cracking and reduced creep life.
Mill Test Certificate
EN 10204 Type 3.1 MTC – Provided with heat number
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV, DNV)
Heat treatment records – Normalize + temper temperatures and times
Mechanical test reports – Tensile, hardness, flattening results
NDT reports – 100% UT results
Traceability: Full traceability from melt to finished pipe
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles (small OD) or single pieces (large OD) |
| Protection | Anti-rust oil + plastic end caps + bevel protectors |
| Marking | Stencil/spray with Grade, size, schedule, heat number, ASME SA335 |
| Documentation | MTC + heat treatment records + UT report |
| Lead time | 15-25 days (stock grades P11, P22), 30-45 days (P91, P92) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our ASME SA335 Chrome-Moly Alloy Pipe?
| Advantage | Description |
|---|---|
| Chrome-moly specialist | Dedicated line for Cr-Mo alloy grades (P11, P22, P91, P92) |
| Full grade range | P5, P9, P11, P22, P91, P92 – one-stop sourcing |
| P22 in stock | Industry standard for high pressure steam – ready to ship |
| P91 available | Advanced creep strength for supercritical boilers |
| P92 for ultra-supercritical | Highest temperature capability (620°C) |
| 100% UT tested | Guaranteed internal integrity |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Proper heat treatment | Fully annealed (P22) or normalized/tempered (P91/P92) |
| Welding support | Preheat and PWHT recommendations for Cr-Mo alloys |
| Global export | Shipped to power plants and refineries worldwide |
Contact for Quote
Please provide the following details:
Grade : P11 / P22 / P91 / P92 / P5 / P9 / Other _______
Size (NPS) : _______
Schedule / WT : _______
Length : _______ (m / ft)
Quantity : _______ (pieces / meters / tons)
Application : Power plant / Refinery / Petrochemical / Other _______
Service Temperature : _______ °C
End Finish : Plain / Beveled
Inspection : Standard / Third-party (SGS/BV/TUV/DNV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website:
Reply within 24 hours.
FAQ – ASME SA335 Alloy Pipe
Q1: What is ASME SA335 used for?
A: High temperature service in power plants, refineries, and petrochemical facilities – main steam lines, boiler headers, heater transfer lines, and high pressure process piping .
Q2: What does "Chrome-Moly" mean?
A: Chromium (Cr) provides oxidation and corrosion resistance; Molybdenum (Mo) provides high-temperature strength and creep resistance.
Q3: What are the most common ASME SA335 grades?
A: P11 (1.25Cr-0.5Mo) and P22 (2.25Cr-1Mo) are the two most widely used alloy pipe grades globally.
Q4: What is P91 used for?
A: P91 (9Cr-1Mo-V-Nb) is used for supercritical and ultra-supercritical power plants – main steam lines at temperatures up to 593°C (1100°F).
Q5: What is the difference between P91 and P92?
A: P92 has tungsten (W) addition providing ~40% higher creep strength and operating temperature up to 620°C (1150°F) for ultra-supercritical applications.
Q6: What is P5 used for?
A: P5 (5Cr-0.5Mo) is commonly used in refinery heaters and petrochemical cracking furnaces where high chromium content provides superior oxidation and sulfidation resistance.
Q7: What is the maximum temperature for P22?
A: 565°C (1050°F) per ASME B31.1/B31.3 allowable stress tables.
Q8: Does P91 require special heat treatment?
A: Yes – P91 must be normalized and tempered (N+T), not simply annealed.
Q9: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, DNV, or any customer-specified agency.
Q10: Do you offer free samples?
A: 30cm sample available for common grades (P11, P22). P91/P92 samples available on request. Shipping fee applies.
Related Products
ASME SA335 – Ferritic alloy pipe (this product)
ASME SA213 – Alloy steel boiler tubes (T11, T22, T91)
ASME SA234 – Alloy steel fittings (WP11, WP22, WP91)
ASME SA182 – Alloy steel flanges (F11, F22, F91)
ASME SA387 – Alloy steel pressure vessel plates
Tags: ASME SA335 Chrome Moly Pipe P11 Pipe P22 Pipe P91 Pipe Alloy Steel Pipe High Temperature Pipe Power Plant Pipe Refinery Pipe
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