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ASTM A335 P91 Alloy Steel Pipe (Chrome Moly Pipe)
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.
To further enhance their strength, P91 steel pipes can undergo specific production methods like normalization and tempering or quenching and tempering. Produced through a seamless manufacturing process, these pipes boast precise dimensions, crucial for applications requiring high precision.
Industries such as petrochemicals, oil and gas, power generation, and refineries heavily rely on A335 P91 alloy pipes, especially in environments characterized by extreme temperatures and pressures. With versatility in dimensions, excellent welding properties, and adherence to various tolerance levels and testing standards, these pipes are trusted for critical applications across demanding sectors.
The SA335P91 Boiler Steel Pipe finds extensive use in industrial boilers and various high-temperature and high-pressure systems. They come in lengths ranging from 4,000mm to 26,000mm, dependent on the pipe’s size.
The ASTM A335 gr P91 Round Pipe is available in single, double, or cut end lengths, with plain, threaded, or beveled ends to ensure protection during transportation.
These pipes feature a wall thickness of 3mm-12mm and are offered in various schedules, including sizes 40, 80, 160, XS, and XXS. Tolerances for the ASTM A335 P91 Alloy Steel Smls Pipe are increased by 0.01mm when cold-drawn and 0.05mm when cold-rolled. Adhering to both international and national standards in production, the Alloy Steel SA 335 P91 Smls Pipe boasts enduring strength that doesn’t degrade over time.
Furthermore, these pipes are highly durable and require minimal maintenance. Leveraging the finest ASTM A335 P91 steel Material and cutting-edge technology in our manufacturing processes, we ensure top-quality products. For any inquiries or further information regarding our ASTM A335 P91 Pipe, please don’t hesitate to reach out to us.
A335 P91 Alloy Steel Pipe Specification
| 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. |
ASTM A335 P91 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 |
ASTM A335 P91 (Chrome Moly Pipe) Alloy Steel 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 Material 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 Werkstoff
| 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) |
| Density / dm 3 | 7.76 |
|---|---|
| Hardness (HB | |
| alloy | Alloyed stainless steels |
| group | Stainless steels Heat resistant steel |
| structure | martensitic |
ASTM A335 P91 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 |