Home > Seamless Pipe > ASTM A335 / ASME SA335
Grades: P1 • P5 • P9 • P11 • P22 • P91 (Chrome-Moly High Temperature Pipes)
Inox Steel India is one of India’s most trusted manufacturers and global exporters of ASTM A335 / ASME SA335 Alloy Steel Seamless Pipes. These high-temperature chrome-moly pipes are engineered for elevated temperature and high-pressure applications in refineries, boilers, power plants, petrochemical units, hydrogen plants, and thermal power generation.
We supply the complete range of P-Grades including P1, P5, P9, P11, P22, and P91 — each designed to withstand severe temperature fluctuations, corrosion, pressure, and long-term creep stress. Our pipes are produced using high-quality alloy steel billets, hot-finished or cold-drawn manufacturing, normalized/tempered heat treatment, and precise dimensional processing.
Every A335 Pipe supplied by Inox Steel India undergoes hydro testing, ultrasonic inspection, hardness testing, tensile testing, flattening/bend testing, and full heat-treatment verification, ensuring total compliance with ASTM/ASME standards and refinery requirements worldwide.
These pipes are extensively used in superheaters, reheaters, steam pipelines, cracking units, furnace tubes, hydrogen services, and high-temperature fluid transfer, where long-term reliability and thermal stability are essential.
ASTM A335 (ASME SA335) is the global standard for high-temperature Chrome-Moly Alloy Steel Seamless Pipes, used for:
Chrome and molybdenum increase the material’s strength, oxidation resistance, creep resistance, and ability to withstand elevated temperatures up to 700°C (depending on grade).
This results in high-temperature, pressure-resistant pipes suitable for demanding refinery and power applications.
| Grade | Temperature Range | Typical Use | Notes |
|---|---|---|---|
| P1 | Up to ~540°C | Low alloy boilers | Economical alloy |
| P5 | Up to ~600°C | Refinery units, heaters | Higher Cr content |
| P9 | Up to ~620°C | Superheaters, reheaters | Stronger than P5 |
| P11 | Up to ~600°C | Power boilers & exchangers | Good weldability |
| P22 | Up to ~600°C | High-pressure, high-temp | Popular in refineries |
| P91 | 650–700°C | Supercritical power plants | Creep strength enhanced ferritic alloy |
| Parameter / Property | A335 P1 | A335 P5 | A335 P9 | A335 P11 | A335 P22 | A335 P91 |
|---|---|---|---|---|---|---|
| Material Type | Chrome-Moly Alloy Steel | Chrome-Moly Alloy Steel | Chrome-Moly Alloy Steel | Chrome-Moly Alloy Steel | Chrome-Moly Alloy Steel | High Alloy (Creep Resistant) |
| Standard | ASTM A335 / ASME SA335 | ASTM A335 / ASME SA335 | ASTM A335 / ASME SA335 | ASTM A335 / ASME SA335 | ASTM A335 / ASME SA335 | ASTM A335 / ASME SA335 |
| Service Type | High Temp Service | High Temp / Pressure | High Temp / Pressure | High Temp Service | High Temp / Pressure | Ultra High Temp / Creep Resistant |
| Typical Chromium (Cr) | 0.50–0.80% | 4.0–6.0% | 8.0–10.0% | 1.0–1.5% | 1.9–2.6% | 8.0–9.5% |
| Typical Molybdenum (Mo) | 0.44–0.65% | 0.45–0.65% | 0.90–1.10% | 0.44–0.65% | 0.87–1.13% | 0.85–1.05% |
| Tensile Strength (MPa) | 380 | 415 | 585 | 415 | 415 | 585–760 |
| Yield Strength (MPa) | 205 | 205 | 275 | 205 | 205 | 415 |
| Elongation (%) | 30 | 30 | 20–25 | 30 | 30 | 20 |
| Temperature Limit | ~540°C | ~600°C | ~620°C | ~600°C | ~600°C | ~650–700°C (Creep Strength Enhanced) |
| Hardness (HB) | 143 Max | 163 Max | 192 Max | 163 Max | 192 Max | 250–265 |
| Manufacturing Method | Seamless | Seamless | Seamless | Seamless | Seamless | Seamless |
| Equivalent Standards | 16Mo3 | X12CrMo5 | X10CrMo9-1 | 13CrMo4-5 | 10CrMo9-10 | X10CrMoVNb9-1 |
| Available Sizes | ½″ – 36″ | ½″ – 36″ | ½″ – 36″ | ½″ – 36″ | ½″ – 36″ | ½″ – 16″ |
| Schedules | SCH 20–XXS | SCH 20–XXS | SCH 20–XXS | SCH 20–XXS | SCH 20–XXS | SCH 40–XXS |
| End Finishes | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain | Bevelled / Plain |
| Primary Applications | Low Alloy Boilers | Refineries & Heaters | High Temp Steam Lines | Power Boilers | Petrochemical Plants | Ultra-High Temp, Creep Resistant Piping |
| HSN Code | 7304.41.00 | 7304.41.00 | 7304.41.00 | 7304.41.00 | 7304.41.00 | 7304.41.00 |
| Certifications | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 |
Temperature & Pressure Requirements
The P-grade selection depends on operating temperature & steam pressure.
Creep Resistance
Hydrogen Service Compatibility
P5, P9, P22, P91 are widely used in hydrogen-rich refining systems.
Heat Treatment Condition
Each material must be supplied normalized, tempered, or quenched as required.
Certification Requirements
We provide:
✔ EN 10204 3.1 / 3.2
✔ Hydro/NDT reports
✔ Heat treatment charts
✔ IBR (if required)
✔ Radiography reports (for welding applications)
India:
Used in NTPC, BHEL, IOCL, BPCL, HPCL, Reliance, Adani & thermal power stations.
Middle East:
Saudi Arabia, UAE, Qatar import large quantities for:
Africa:
Nigeria, Kenya, Egypt, South Africa demand alloy pipes for boilers & process plants.
Europe & Americas:
Large market for P11, P22, P91 in power generation and refining.
Inox Steel India exports globally through JNPT, Mundra & Hazira.
Chrome-Moly Alloy Steel ASTM A335 / ASME SA335 Pipes from Inox Steel India are manufactured for high-temperature, high-pressure, and long-term creep-resistant environments. These pipes are engineered for boilers, heat exchangers, superheaters, reformer tubes, hydrogen lines, and refinery heater tubes.
Below is the grade-wise application mapping, dimensional chart, indicative pricing, and quality protocols — all formatted exactly like your previous pages
ASTM A335 P1 — Low Alloy Boiler Grade
Service Use:
Low-temperature, medium-pressure boiler systems.
Typical Applications:
Temp Range:
Up to ~540°C
Size Range:
½″ – 36″ NPS
Industries:
Boilers | Chemical | Power | Industrial Heating
ASTM A335 P5 — High-Temperature Refinery Grade
Service Use:
High-temperature and hydrogen service.
Typical Applications:
Temp Range:
Up to ~600°C
Size Range:
½″ – 36″ NPS
Industries:
Refineries | Petrochemical | Hydrogen Units
ASTM A333 Grade 6 — MOST WIDELY USED LTCS PIPE
Service Use:
Standard LTCS grade used globally in refineries, LNG, power plants.
Typical Applications:
Temp Range:
−45°C service
Size Range:
½″ – 36″ NPS (SCH 20 to XXS)
Industries:
Oil & Gas | Refineries | Power Plants | LNG
ASTM A335 P9 — High Strength Chrome-Moly
Service Use:
Steam pipelines and superheater systems requiring higher strength than P5.
Typical Applications:
Temp Range:
Up to ~620°C
Size Range:
½″ – 36″ NPS
Industries:
Power | Petrochemical | Refineries
ASTM A335 P11 — Power Boiler & Steam Line MaterialService Use:
Medium alloy, excellent weldability for power generation.Typical Applications:
Temp Range:
Up to ~600°C
Size Range:
½″ – 36″ NPS
Industries:
Power | Boilers | Chemical | Refinery
ASTM A335 P22 — Most Popular High-Temp Service Grade
Service Use:
High temperature + high pressure.
Typical Applications:
Temp Range:
Up to ~600°C
Size Range:
½″ – 36″ NPS
Industries:
Refineries | Petrochemicals | Power | Chemical
ASTM A335 P91 — Creep-Strength Enhanced Grade (Premium)
Service Use:
Ultra-high temperature & supercritical boiler systems.
Typical Applications:
Temp Range:
650–700°C
Size Range:
½″ – 16″ NPS (P91 usually limited to smaller OD)
Industries:
Power | Thermal | Refineries | Petrochemical
| NPS (Inch) | OD (mm) | Wall Thickness (SCH 40) | Approx. Weight (kg/m) |
|---|---|---|---|
| ½″ | 21.3 | 2.77 | 1.27 |
| 1″ | 33.4 | 3.38 | 2.73 |
| 2″ | 60.3 | 3.91 | 5.44 |
| 3″ | 88.9 | 5.49 | 10.88 |
| 4″ | 114.3 | 6.02 | 14.98 |
| 6″ | 168.3 | 7.11 | 28.26 |
| 8″ | 219.1 | 8.18 | 41.95 |
| 10″ | 273.1 | 9.27 | 62.42 |
| Grade | Avg. Price INR/kg (FOB Mumbai) | Approx. USD/kg (FOB India) | Typical Use |
|---|---|---|---|
| P1 | ₹ 125 – ₹ 150 | $1.70 – $2.00 | Low alloy, boilers |
| P5 | ₹ 225 – ₹ 270 | $2.80 – $3.40 | High temp, refinery |
| P9 | ₹ 280 – ₹ 350 | $3.60 – $4.20 | Superheaters |
| P11 | ₹ 155 – ₹ 185 | $2.10 – $2.50 | Boilers & power |
| P22 | ₹ 210 – ₹ 240 | $2.70 – $3.05 | High temp + pressure |
| P91 | ₹ 380 – ₹ 480 | $5.20 – $6.40 | Supercritical power plants |
✔ HSN 7304.41.00
(Seamless Alloy Steel Pipes for High Temperature Service)
Applies to all P-Grades: P1, P5, P9, P11, P22, P91.
Every ASTM A335 pipe undergoes severe metallurgical & mechanical testing due to high-temperature application.
Quality Tests Conducted:
Documentation Supplied:
This ensures A335 pipes from Inox Steel India meet global refinery, power, and petrochemical standards
Inox Steel India is a leading global supplier of Chrome-Moly Alloy Steel Seamless Pipes under ASTM A335 / ASME SA335, trusted by refineries, petrochemical complexes, power plants, EPC contractors, and boiler manufacturers worldwide.
Our speciality lies in providing the full range of P-Grades, including P1, P5, P9, P11, P22, and P91 — each engineered to perform under extreme temperature, pressure, and high creep conditions.
We are known for:
Top Reasons to Choose Inox Steel India
Inox Steel India delivers sustainable, reliable, and high-temperature safe piping solutions.
| Industry | Application | Preferred Grades |
|---|---|---|
| Refineries | Heater tubes, hydrogen units | P5 • P9 • P22 |
| Petrochemical Plants | High-temp reformers | P9 • P22 |
| Power Plants | Superheaters, reheaters, main steam lines | P11 • P22 • P91 |
| Boilers & HRSG | Boiler tubes, economizers | P1 • P11 • P22 |
| Thermal Power Units | Ultra-supercritical lines | P91 |
| Fertilizer Plants | Ammonia reformer tubes | P5 • P9 |
| Chemical Processing | High-pressure high-temp systems | P11 • P22 |
To protect each high-temperature alloy pipe and ensure zero surface or structural damage during transit, Inox Steel India follows international-grade packaging:
🌍 Most Exported Destinations:
UAE • Saudi Arabia • Oman • Kuwait • Qatar • Egypt • South Korea • USA • Canada • UK • Germany • Italy • South Africa • Malaysia
If you are looking for an ASTM A335 / ASME SA335 Alloy Steel Pipe Supplier near Alankar Cinema, Mumbai, Inox Steel India is the most reliable source for P-Grades.
We offer:
Our centrally located Mumbai warehouse ensures fast delivery and easy access.
Get the right grade selection support, heat treatment guidance, and complete technical assistance.
📥 Downloads Available:
MTC • Heat Treatment Charts • Price List • Dimensional Chart • Alloy Steel Piping Catalog (PDF)
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
Inox Steel India
Email
Phone
P11, P22, and P91 are the most demanded globally.
Yes — ASTM A335 pipes are exclusively seamless.
Yes — due to their Chromium-Molybdenum composition.
Yes — complete documentation provided.
Yes — P11, P22, P91 require proper PWHT (Post Weld Heat Treatment).
HSN: 7304.41.00
Yes — regular shipments to USA, Middle East, Africa, Europe & Asia.
Inox Steel India is a premier supplier of ASTM A335 Chrome-Moly Alloy Steel Pipes (P1–P91) for boilers, power plants, refineries, and petrochemical units.
We ensure strict quality control, precise metallurgy, high-temperature durability, and global export capability.