Alloy Steel P91 Seamless Pipes is often referred to as excellent steel due to its increased resistance to chloride corrosion making it a very suitable material for use in salt water environments. These fabricated Alloy Steel P91 Welded Pipes have close tolerance and dimensional accuracy that makes them very popular and result oriented. As a prominent company, we are engaged in trading and supplying a wide range of Alloy Steel P91 EFW Pipe which finds its application in heavy duty industrial applications and can be customized in diverse sizes. We own rich experiences in dealing with wide range of Alloy Steel P91 ERW Pipes, which are convenient to use are specifically designed according to their use. Alloy Steel P91 Round Pipes is known for its Improved welding ability, Corrosion and abrasion resistance, Resistant to stress cracking, and more.
We also offer our range of Alloy Steel P91 Square Pipes in various specifications that meet the individual requirement of our clients.
Alloy Steel P91 Seamless Pipes Outside Diameter & Tolerance
| ASTM A450 |
Hot rolled |
Outside Diameter, mm |
Tolerance, mm |
| OD≤101.6 |
+0.4/-0.8 |
| 101.6?OD≤190.5 |
+0.4/-1.2 |
| 190.5?OD≤228.6 |
+0.4/-1.6 |
| Cold Drawn |
Outside Diameter, mm |
Tolerance, mm |
| OD?25.4 |
±0.10 |
| 25.4≤OD≤38.1 |
±0.15 |
| 38.1?OD?50.8 |
±0.20 |
| 50.8≤OD?63.5 |
±0.25 |
| 63.5≤OD?76.2 |
±0.30 |
| 76.2≤OD≤101.6 |
±0.38 |
| 101.6?OD≤190.5 |
+0.38/-0.64 |
| 190.5?OD≤228.6 |
+0.38/-1.14 |
| ASTM A530 & ASTM A335 |
NPS |
Outside Diameter, inch |
Tolerance, mm |
| 1/8≤OD≤1-1/2 |
±0.40 |
| 1-1/2?OD≤4 |
±0.79 |
| 4?OD≤8 |
+1.59/-0.79 |
| 8?OD≤12 |
+2.38/-0.79 |
| OD>12 |
±1% |
ASME SA335 Alloy Steel P91 Seamless Pipe Chemical Composition
| Si, % |
Cr, % |
Mo, % |
C, % |
Mn, % |
P, % |
S, % |
| 0.20 -0.50 |
8.00 - 9.50 |
0.85 - 1.05 |
0.08-0.12 |
0.30-0.60 |
0.020 max |
0.010 max |
ASME SA335 AS P91 Seamless Pipe Mechanical Properties
| Tensile Strength, MPa |
Yield Strength, MPa |
Elongation, % |
| 585 min |
415 min |
20 min |
NOTE : OTHER SIZES AND GRADES ARE AVAILABLE UPON REQUEST
ALLOY STEEL P91 SEAMLESS PIPE SPECIFICATIONS
AS Seamless Pipes are available in different grades and standards. Some of the standard features these are made available in include
Dimensions : ASTM, ASME and API
Standard : ASTM A 335 / ASME SA 335
Size : 1/2” NB to 36” NB
Thickness : 2.0mm – 14 mm
Outer Diameter : 19.05mm – 114.3mm
Form : Round, Square, Rectangular, Hydraulic Etc
End : Plain End, Beveled End, Treaded
Length : Single Random, Double Random & Required Length, Custom Size – 12 Meter lengths
Schedules : SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules, upto 12mm thk
