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ASTM A335 P91 Seamless Pipe plays a vital role in various industries as part of the A335 specification. These pipes, known as ASME SA 335 Grade P91 Alloy Steel Pipes, are crafted from a unique chromium-molybdenum alloy composition, incorporating 1% molybdenum, 9% chromium, and additional elements like nickel, manganese, silicon, and carbon.
ASTM A335 P91 Pipe mechanical properties, including impressive tensile strength, yield strength, and resistance to impact, corrosion cracking, and oxidation, are direct results of this composition.
ASTM A335 P91 Alloy Steel Pipe: Key Features and Uses
ASTM A335 P91 Alloy Steel Pipe is vital in industries like petrochemicals, oil and gas, and power generation. Made from a chromium-molybdenum alloy (1% molybdenum, 9% chromium), this pipe boasts excellent tensile strength, yield strength, and resistance to impact, corrosion cracking, and oxidation. P91 pipes are produced through seamless manufacturing, ensuring precise dimensions. These pipes, also known as Chrome Moly Pipe, undergo processes like normalization and tempering for enhanced strength. Available in various schedules and wall thicknesses, they meet international standards. Durable and low-maintenance, P91 pipes are perfect for high-temperature, high-pressure environments. For details on ASTM A335 P91 chemical composition of P91 steel mechanical properties, contact us.
Specification Of A335 P91 Material
| Specialized in | Sizes in Large Diameter |
|---|---|
| OD | 19.05 milimeter – 114.3 milimeter |
| WT | 2.0 milimeter – 14 milimeter |
| Length | maximum 16000 milimeter |
| Form | Square, Hydraulic, Round, Rectangular, Etc. |
| Standard | SA335 P91, ASTM A335 P91 |
| Thickness | From 3 to 12 milimeter |
| Size | From 1/2 NB upto 36 NB |
| Schedule | Schedule 40, 80, 160, XS, XXS |
| Tolerance |
Cold rolled pipe: +/-0.05 milimeter Cold drawn pipe: +/-0.1 milimeter
|
| Craft | Cold drawn / Cold rolled |
| Type | ERW / Fabricated / Seamless / Welded |
| Length | Double Random, Cut Length, Single Random, . |
| Specialized in | SA335 P91 |
| Additional Testing | NACE TM0177, H2 SERVICE, NACE MR0175, IBR, NACE TM0284, SSC TEST, HIC TEST, etc. |
A335 P91 Alloy Steel Pipe Chemical Composition
| C | Si | Mn | P | S | AL | Cr | Cu | Mo | N | Nb | Ni | V | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.4903 | Min% | 0.08 | 0.30 | 8.0 | 0.85 | 0,030 | 0,060 | 0.18 | ||||||
| Max % | 0.12 | 0.50 | 0.60 | 0,020 | 0.005 | 0,040 | 9.50 | 0.30 | 1.05 | 0,070 | 0,100 | 0.30 | 0.25 |
P91 Alloy Steel Pipe (Chrome Moly Pipe) Physical Properties
| Temperature T ° C / ° F (° C / F) | Specific heat J / kgK (Btu / lb ° F) | Thermal conductivity W / mK (Btu · in / ft 2 · h · ° F) | Electrical resistance μΩ · cm (Ω circ / ft) | Young’s modulus kN / mm 2 (10 3 ksi) | Expansion coefficient from 20 ° C to T 10 -6 / K (10 -6 / ° F) |
|---|---|---|---|---|---|
| 20/68 | 460 (-) | 26 (-) | 218 (-) | ||
| 200/392 | 207 (-) | 11.3 (-) | |||
| 400/752 | 190 (-) | 12.0 (-) | |||
| 500/932 | 30 (-) | 12.3 (-) | |||
| 600/1112 | 12.6 (-) | ||||
| 650/1202 | 162 (-) | 12.7 (-) |
| Temp. | Time limit | Time limit | Creep strength | Creep strength | Creep strength |
|---|---|---|---|---|---|
| Rp0.2 | 10 000h | 100 000h | |||
| ° C | N / mm 2 / ksi | N / mm 2 / ksi | N / mm 2 / ksi | ||
| 20/68 | 450/65 | ||||
| 100/212 | 410 / 59.4 | ||||
| 300/572 | 360 / 52,2 | ||||
| 500/932 | 300 / 43.5 | 289 / 41.9 | 258 / 37.4 | ||
| 550/1022 | 270 / 39.1 | 199 / 28,8 | 166 / 24.0 | ||
| 600/1112 | 215 / 31,1 | 122 / 17.6 | 94 / 13.6 | ||
| 650/1202 | 70 / 10,1 | 49 / 7,1 | |||
| ksi values are calculated | |||||
| temperature | 0.2% proof stress at higher temperatures |
|---|---|
| ° C / ° F | Rp 0.2 |
| Mpa / ksi | |
| 100/212 | 410 / 59.4 |
| 200/392 | 380 / 55,1 |
| 300/572 | 360 / 52,2 |
| 400/752 | 340 / 49,3 |
| 500/932 | 300 / 43.5 |
| 600/1112 | 215 / 31,1 |
ASTM A335 P91 Mechanical Properties
| Yield strength Rp0.2 (N / mm 2 ) | > = 450 | Normalized + tempered |
|---|---|---|
| Yield strength Mpa / ksi | 415/60 | ASTM A 335 -P91 |
| Tensile strength Rm (N / mm 2 ) | 620-850 | Normalized + tempered |
| Elongation at break-A5 (%) min.lengths | > = 20 | Normalized + tempered |
| Notched impact strength (J) across | 40 | transversely / normalized + tempered |
| Tensile strength Rm N / mm 2 / ksi | 585/85 | ASTM A 335 -P91 |
ASTM A335 P91 Alloy Steel Pipe Material
| EN material short name |
X10CrMoVNbN9-1 |
|---|---|
| AFNOR | X10CrMoVNbN9-1 (NF EN 10088-1 (06/2005) (Fri) |
| BS | X10CrMoVNbN9-1 (EN 10088-1 (06/2005) (GB) |
| Material no | 1.4903 |
| Density / dm 3 | 7.76 |
| Hardness (HB | |
| alloy | Alloyed stainless steels |
| group | Stainless steels Heat resistant steel |
| structure | martensitic |
ASTM A335 P91 Alloy Steel Pipe Equivalents Standard
| ASTM International | Fitting material | Specification | Material |
|---|---|---|---|
| A335 Gr. P91 | ASTM A234 WP91 | X10CrMoVNb9-1, 1.4903, NIRONIT | 9% Chrome; 1% Moly + trace elements |
Applications of P91 Alloy Steel Pipe
ASTM A335 P91 Type 2 pipes are used in various industries for high-temperature and high-pressure applications. Some common uses include:
- Power generation
- Gas processing equipment
- Oil services
- Petrochemical plants
- Heaters and reheat lines
- Boilers
SA179 Tubes meet the requirements for ASTM A335 P91 Type 2 pipes. They are used for fittings, tubing, flanges, valves, and more in industries such as chemical processing and power plants, where very high heat situations occur.
Supply and Exporter of ASTM A335 P91 Alloy Steel Pipe
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FAQ
ASTM A335 P91 is a grade of seamless ferritic alloy steel pipe intended for high-temperature service. It is commonly used in power plants and petrochemical plants for applications such as superheaters, reheaters, and steam piping systems.
Chrome moly pipe is typically available in grades such as ASTM A335 P5, P9, P11, P22, and P91.
No, P91 is not considered low alloy steel. It is a high-alloy steel, specifically a ferritic-martensitic steel, commonly used in high-temperature and high-pressure applications.
A335/SA335 P91 is a type of ferritic alloy steel known for its high strength and creep resistance, meaning it maintains its strength over time. It's also called 9 Cr 1 Mo steel or chrome moly pipe due to its composition, which includes 9% chromium and 1% molybdenum.