ASTM A335 P91 is a grade of seamless alloy steel pipe that is commonly used in high-temperature applications. This steel pipe is made from a mixture of carbon, manganese, phosphorus, sulfur, silicon, chromium, and molybdenum.The ASTM A335 P91 seamless alloy steel pipe has excellent mechanical properties, including high strength and toughness. It also has good corrosion resistance and oxidation resistance at elevated temperatures. This makes it ideal for use in power generation plants, oil refineries, petrochemical plants, and other high-temperature applications.
Product Details
| Specialized in | Large Diameter Size |
| Outer Dimensions | 19.05mm – 114.3mm |
| Wall Thickness | 2.0mm – 14 mm |
| Length | max 16000mm |
| Schedule | Schedule 20 - Schedule XXS (heavier on request) up to 250 mm thk. |
| Form | Round, Square, Rectangular, Hydraulic Etc. |
| Standard | ASTM A335 P91, SA335 P91 (with IBR Test Certificate) |
| Size | 1/2 NB to 36 NB |
| Thickness | 3-12mm |
| Schedule | SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules |
| Tolerance | Cold drawn pipe: +/-0.1mmCold rolled pipe: +/-0.05mm |
| Craft | Cold rolled and Cold drawn |
| Type | Seamless / ERW / Welded / Fabricated |
| Length | Single Random, Double Random & Cut Length. |
| End | Plain End, Beveled End, Treaded |
| Specialized in | Large Diameter SA335 P91 Material |
| Additional Testing | NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc. |
| Application | Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service |
| ASTM A335 P91 Pipe Types | Out diameter | Wall thickness | Length |
| ASTM A335 P91 Seamless Pipe (Custom Sizes) | 1/2" NB - 60" NB | SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160 | Custom |
| ASTM A335 P91 Welded Pipe (in Stock + Custom Sizes) | 1/2" NB - 24" NB | As per requirement | Custom |
| ASTM A335 P91 ERW Pipe (Custom Sizes) | 1/2" NB - 24" NB | As per requirement | Custom |
| ASTM A335 High Pressure P91 Boiler Pipe | 16" NB - 100" NB | As per requirement | Custom |
ASTM A335 P91 Chemical Composition
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % | V, % | N, % | Ni, % | Al, % | Nb, % |
| 0.08-0.12 | 0.3-0.6 | 0.02 max | 0.01 max | 0.2-0.5 | 8.0-9.5 | 0.85-1.05 | 0.18-0.25 | 0.03-0.07 | 0.4 max | 0.04 max | 0.06-0.10 |
ASTM A335 P91 Properties
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| 585 min | 415 min | 20 min | 250 max |
Physical Properties Of P91 Pipe
| 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 (-) |
| 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 |
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