ASTM A335 P91 Alloy Steel Seamless Pipe

Stockist of ASTM A335 Gr P91 ERW Pipes in Mumbai

ASTM A335 P91 pipe suppliers produce these pipes of UNS K91560 standard for different high temperature, high pressure applications. The P91 low alloy steel pipe is one of the high strength, high pressure pipes. The material is stabilized with vanadium, columbium and nitrogen to improve the creep strength. The ASTM A335 Gr P91 ERW Pipes have 585MPa minimum tensile strength and 415MPa minimum yield strength. The highs strength of the material allows it to make pipes with reduced wall thickness by up to 50% compared to other pressure pipe grades in the ASTM A335 specification.

ASTM A335 P91 Alloy Steel Seamless Pipe

ASTM A335 P91 Alloy Steel Seamless Pipe

P91 Alloy Steel Pipe

P91 Alloy Steel Pipe

The ASTM A335 Grade P91 Pipe has carbon, manganese, phosphorus, sulfur, silicon, 8% chromium, molybdenum, vanadium, nitrogen, nickel, aluminum, columbium, titanium and zirconium. Although the stabilizing agents are added in less than 1% of the total composition, they provide the ASME SA335 P91 material with the added mechanical properties such as the high strength, corrosion resistance and creep resistance. The ASTM A335 P91 Welded Pipe can be welded without the threat of localized corrosion. This is one of the most used grades for elevated temperature with oxidation reduction.

ASME SA335 P91 Pipe

The Tubo A335 P91 products are used in high temperature and high pressure applications such as boilers, oil services, gas processing equipment, power generation plants, heater and reheat lines and so on. The UNS K11522 Seamless Pipe is virtually non-deteriorating, creep resistant like no other pressure pipes and has reduced wall thickness.

Well-Known High Strength Alloy steel ASTM A335 P91 Welded Pipe Manufacturer in India.


Specifications Chart of ASTM A335 P91 Pipe

Alloy Steel Pipe in Grade
ASTM A335 P1/ P2/ P5/ P5b/ P5c/ P9/ P11/ P12/ P15/ P21/ P22/ P23/ P24/ P36/ P91/ P92/ P122/ P911
(with IBR Test Certificate)
In Length of
Single Random, Double Random & Required Length, Custom Size – 12 Meter lengths
Value Added Service
 Draw & Expansion as per required Size & Length
Heat Treatment,
Bending,
Annealed,
Machining Etc.
Test Certificate
 Manufacturer Test Certificate 
IBR Test Certificate 
Laboratory Test Certificate from Govt. Approved Lab. & 
Under Third Party Inspection
Form Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes
End Plain End, Beveled End, Threaded
Type Seamless / ERW / Welded / Fabricated / CDW
End Protection Plastic Caps
Outside Coating Black Painting, Anti-Corrosion Oil, Galvanised Finish, Finish as per customer Requirements
Inspection, Test Certificate/ Reports Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports, India Boiler Regulations (IBR) Test Certificate

Refer UNS K11522 Seamless material chemical composition and View ASTM A335 Grade P91 Square/ Round Pipe wall thickness.


ASTM A335 P91 Alloy Steel Pipe 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

ASME SA335 P91 Pipe Mechanical Properties

Tensile Strength , MPa Yield Strength, MPa Elongation, % Hardness, HB
585 min 415 min 20 min 250 max

A335M-P91 high temperature ferritic alloy steel seamless P91

Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation Min (vertical bar specimen )% ① Elongation Min (round bar specimens )% Squash
ASTM A335/A335M-03 "high temperature ferritic alloy steel seamless" P1, P2 ≥ 205 ≥ 380 30 22 H
P12 ≥ 220 ≥ 415 30 22 H
P23 ≥ 400 ≥ 510 20 20 H
P91 ≥ 415 ≥ 585 20 20 H
Other ≥ 205 ≥ 415 30 22 H
Note: ① using the vertical bar specimens, the wall thickness of less than 8mm, each reduction 0.8mm, P23, P91 should subtract the base elongation of 1.0%, 1.5%, minus all other grades.
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation% Squash 　
　
ASTM A500-2001 "Structural carbon steel cold-formed and shaped circular cross-section welded steel pipe and seamless steel pipe." Grade A ≥ 228 ≥ 310 ≥ 25 H 　
Grade B ≥ 290 ≥ 400 ≥ 23 H 　
Grade C ≥ 317 ≥ 427 ≥ 21 H 　
Grade D ≥ 250 ≥ 400 ≥ 23 H 　
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation% Squash Flaring
ASTM A556M-96 "water heater with carbon steel cold drawn seamless steel tubes." A2 ≥ 180 ≥ 320 ≥ 35 H H
B2 ≥ 260 ≥ 410 ≥ 30 H H
C2 ≥ 280 ≥ 480 ≥ 30 H H
Standard Steel grade  Yield strength Tensile strength Elongation (%) ① 　 　
　 　
JIS G 3473-1988 "Carbon steel cylinder" STC370 ≥ 215 ≥ 370 ≥ 30 Note: ① thickness <8mm pipe, elongation is reduced by the minimum thickness at 1mm, to subtract the elongation of 1.5%.
STC440 ≥ 305 ≥ 440 ≥ 10
STC510A ≥ 380 ≥ 510 ≥ 10
STC510B ≥ 380 ≥ 510 ≥ 15
STC540 ≥ 390 ≥ 540 ≥ 20
STC590A ≥ 490 ≥ 590 ≥ 10
STC590B ≥ 490 ≥ 590 ≥ 15
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation %① Squash 　
　
JIS G 3467-1988 "furnace with steel." STF410 ≥ 245 ≥ 410 ≥ 24 0.08  Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.
STFA12 ≥ 205 ≥ 380 ≥ 24
STFA22 ≥ 205 ≥ 410 ≥ 24
STFA23 ≥ 205 ≥ 410 ≥ 24
STFA24 ≥ 205 ≥ 410 ≥ 24
STFA25 ≥ 205 ≥ 410 ≥ 24
STFA26 ≥ 205 ≥ 410 ≥ 24
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation %① Squash 　
　
JIS G 3462-1988 "boilers, heat exchangers used in steel pipe." STBA12 ≥ 205 ≥ 380 ≥ 30 0.08 　
Other ≥ 205 ≥ 410 ≥ 30 　
 Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.
Standard Steel grade  Wall thickness  mm Yield strength M Pa Tensile M Pa Elongation% ① Flattening / Flaring
JIS G 3461-1988 "boilers, heat exchangers used in carbon steel." STB340 ≥ 8 ≥ 175 ≥ 340 ≥ 35 H
STB410 ≥ 8 ≥ 255 ≥ 410 ≥ 25 H
STB510 ≥ 8 ≥ 295 ≥ 510 ≥ 25 H
 Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation (vertical bar specimen ) %① Elongation  ( round bar specimens )% Squash Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.
JIS G 3456-1988 "high carbon steel pipes." STPT370 ≥ 215 ≥ 370 ≥ 30 ≥ 28 0.08
STPT410 ≥ 245 ≥ 410 ≥ 2 5 ≥ 24 0.07
STPT480 ≥ 275 ≥ 480 ≥ 2 5 ≥ 22
Standard Steel grade  Yield strength Tensile strength Elongation  ( tube sections and longitudinal strips sample) % ① Elongation (round bar specimens )% Squashed or bent
JIS G 3455-1988 "high carbon steel pipes." STS370 ≥ 215 ≥ 370 ≥ 30 ≥ 28 H
STS410 ≥ 245 ≥ 410 ≥ 25 ≥ 24 H
STS480 ≥ 275 ≥ 480 ≥ 25 ≥ 22 H
 Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.
Standard Steel grade  Yield strengthM P a Tensile M Pa Elongation  ( vertical bar specimen )% ① Elongation  ( round bar specimens )% Squash
JIS G 3454-1988 "pressure pipes carbon steel pipe." STPG370 ≥ 215 ≥ 370 ≥ 30 ≥ 28 0.08
STPG410 ≥ 245 ≥ 410 ≥ 2 5 ≥ 24 0.07
 Note: ① using vertical bar specimens, the wall thickness of less than 8mm, each reduced 1mm, from the basic minimum elongation shall be subtracted 1.5%.

P91 Alloy Steel Seamless Pipe 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 P91 Alloy Steel Seamless Pipe Wall thickness & Tolerance

ASTM A450
Hot rolled
Outside Diameter, mm
Tolerance, %

OD≤101.6, WT≤2.4
+40/-0
OD≤101.6, 2.4＜WT≤3.8
+35/-0
OD≤101.6, 3.8＜WT≤4.6
+33/-0
OD≤101.6, WT>4.6
+28/-0
OD>101.6, 2.4＜WT≤3.8
+35/-0
OD>101.6, 3.8＜WT≤4.6
+33/-0
OD>101.6, WT>4.6
+28/-0
Cold Drawn
Outside Diameter, mm
Tolerance, %
OD≤38.1
+20/-0
OD>38.1
+22/-0
ASTM A530
NPS
Outside Diameter, inch
Tolerance, %
1/8≤OD≤2-1/2
+20.0/-12.5
3≤OD≤18, WT/OD≤5%
+22.5/-12.5
3≤OD≤18, WT/OD>5%
+15.0/-12.5
OD≥20, WT/OD≤5%
+22.5/-12.5
OD≥20, WT/OD>5%
+15.0/-12.5

Quick delivery available on P91 low alloy steel SAW pipe, Get ASTM A335 Grade P91 Rectangular in schedule 40 and sch 80.

ASME SA335 P91 Alloy Steel Seamless Pipe Size Range

  • Size range: ½” nominal through 60” OD
  • Wall Thickness up through 4” thick& heavier upon request
  • Alloy Steel Pipes Specifications & Grades:

ASTM A335 P91 Welded Pipe Rate Card

Size MSL Make JSL Make ISMT make
1" 3,897.06 3,904.41 3,889.71
1/2" 4,264.71 4,272.06 4,257.35
1.25" 3,852.94 3,860.29 3,845.59
3/4" 4,044.12 4,051.47 4,036.76
1.5" 3,750.00 3,757.35 3,742.65

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Weight Table of ASTM A335 Grade P91 Pipe

Size NPS Pipe O.D. Wall Thickness Pipe I.D. Weight per Foot Standard to XXHY Schedule
Pipe # 		Section Modulus Gallon Capacity Per Linear Foot
1/2 0.84 0.109 0.622 0.85 STD 40 .0407 .0158
0.147 0.546 1.09 XHY 80 .0478 .0122
0.188 0.464 1.31 160 .0528 .0088
0.294 0.252 1.72 XXHY .0577 .0026
3/4 1.05 0.113 0.824 1.13 STD 40 .0705 .0277
0.154 0.742 1.48 XHY 80 .0853 .0225
0.219 0.612 1.95 160 .1006 .0153
0.308 0.434 2.44 XXHY .1103 .0077
1 1.315 0.133 1.049 1.68 STD 40 .1328 .0449
0.179 0.957 2.17 XHY 80 .1606 .0374
0.250 0.815 2.85 160 .1904 .0271
0.358 0.599 3.66 XXHY .2136 .0146
1 1/4 1.66 0.140 1.380 2.27 STD 40 .2346 .0777
0.191 1.278 3.00 XHY 80 .2913 .0666
0.250 1.160 3.77 160 .3421 .0549
0.382 0.896 5.22 .4110 .0328
1 1/2 1.90 0.145 1.610 2.72 STD 40 .3262 .1058
0.200 1.500 3.63 XHY 80 .4118 .0918
0.281 1.338 4.86 160 .5079 .0730
0.400 1.100 6.41 .5977 .0494
2 2.375 0.109 2.157 2.64 10 .4205 .1898
0.154 2.067 3.66 STD 40 .5606 .1743
0.218 1.939 5.03 XHY 80 .7309 .1534
0.250 1.875 5.68 .8045 .1434
0.281 1.813 6.29 .8666 .1344
0.344 1.687 7.47 160 .9806 .1161
0.436 1.503 9.04 XXHY 1.1043 .0922
2 1/2 2.875 0.120 2.635 3.53 10 .6870 .2833
0.203 2.469 5.80 STD. 40 1.0640 .2487
0.216 2.443 6.14 1.1169 .2435
0.250 2.375 7.02 1.2468 .2301
0.276 2.323 7.67 XHY 80 1.3386 .2202
0.375 2.125 10.02 160 1.6371 .1842
0.552 1.771 13.71 XXXHY 1.9971 .1280
3 3.50 0.120 3.260 4.34 1.0411 .4336
0.156 3.188 5.58 1.3122 .4147
0.172 3.156 6.12 1.4265 .4064
0.188 3.124 6.66 1.5342 .3984
0.216 3.068 7.58 STD. 40 1.7241 .3840
0.250 3.000 8.69 1.9372 .3672
0.281 2.938 9.67 2.1207 .3521
0.300 2.900 10.26 XHY 80 2.2253 .3431
0.438 2.624 14.34 160 2.8774 .2811
0.600 2.300 18.6 XXHY 3.4243 .2158
3 1/2 4.0 0.120 3.760 4.98 10 1.3776 .5768
0.226 3.548 9.12 STD. 140 2.3939 .5136
0.250 3.500 10.02 2.6001 .4998
0.281 3.438 11.17 2.8562 .4821
0.318 3.364 12.52 XHY 80 3.1400 .4617
0.636 2..728 22.87 XXHY 4.8795 .3085
4 4.5 0.120 4.260 5.62 10 1.7612 .7404
0.156 4.188 7.24 2.2354 .7156
0.188 4.124 8.67 2.6296 .6942
0.203 4.094 9.32 2.8173 .6838
0.219 4.062 10.02 3.0184 .6725
0.237 4.026 10.80 STD. 40 3.2145 .6613
0.250 4.000 11.36 3.3611 .6528
0.281 3.938 12.67 60 3.7021 .6326
0.312 3.876 13.97 4.0273 .6126
0.337 3.826 15.00 XHY 80 4.2713 .5972
0.438 3.624 19.02 120 5.1790 .5361
0.531 3.438 22.53 160 5.8997 .4822
0.674 3.152 27.57 XXHY 6.7927 .4054
5 5.563 0.188 5.187 10.80 4.1161 1.0979
0.219 5.125 12.51 4.7279 1.0716
0.258 5.047 14.63 STD. 40 5.4500 1.0391
0.281 5.001 15.87 5.8644 1.0204
0.312 4.939 17.51 6.4074 .99647
0.344 4.875 19.19 6.9358 .9696
0.375 4.813 20.80 XHY 80 7.4300 .9449
0.500 4.563 27.06 120 9.2534 .8495
0.625 4.313 32.99 160 10.7976 .7590
0.750 4.063 38.59 XXHY 12.0954 .6734
6 6.625 0.109 6.407 7.59 5 3.5769 1.6748
0.134 6.357 9.30 10 4.3475 1.6488
0.156 6.313 10.79 5.0107 1.6260
0.188 6.249 12.94 5.9351 1.5937
0.203 6.219 13.94 6.3804 1.5780
0.219 6.187 15.00 6.8261 1.5620
0.250 6.125 17.04 7.6905 1.5306
0.280 6.065 18.99 STD. 40 8.4958 1.5008
0.312 6.001 21.06 9.3416 1.4688
0.344 5.937 23.10 10.111 1.4391
0.375 5.875 25.05 10.893 1.4082
0.432 5.761 28.60 XHY 80 12.224 1.3541
0.500 5.625 32.74 13.711 1.2909
0.562 5.501 36.43 120 14.9806 1.2346
0.625 5.375 40.09 16.1821 1.1787
0.719 5.187 45.39 160 17.8243 1.0977
0.864 4.897 53.21 XXHY 20.025 .9784
1.000 4.625 60.13 21.7719 .8727
1.125 4.375 66.14 23.1237 .7809

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P91 low alloy steel pipe Heat Treatment Requirements

Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing
or Tempering
Temperature Range F
[C]
ASTM A335 P91 Pipe Normalize and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800]
  Quench and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800]

Equivalent Grades of ASTM A335 Gr P91 ERW Pipes

ASTM ASME Equivalent material JIS G 3458 UNS BS DIN ISO ABS NK LRS
A335 P91 SA335 P91 T91, K90901, X10CrMoVNb9-1, 1.4903 K91560

ASTM ASME
ASTM A335 Grade P91 Pipe 9% Chrome; 1% Moly + trace elements SA335 P91 A335 9% Chrome; 1% Moly + trace elements

Most famous types of ASME SA335 P91 material

ASTM A335 Grade P91 NACE SAW Pipe
ASTM A335 Grade P91 NACE SAW Pipe
SA335 P91 Schedule 40 Pipe
SA335 P91 Schedule 40 Pipe
ASTM A335 P91 High pressure boiler pipes
ASTM A335 P91 High pressure boiler pipes

Alloy Steel P91 Welded Pipe
Alloy Steel P91 Welded Pipe
DN10 SCH40 Hot rolled ASTM A335 P91 Alloy Seamless Steel Pipe
DN10 SCH40 Hot rolled ASTM A335 P91 Alloy Seamless Steel Pipe
ASTM A335 P91 Square hollow section
ASTM A335 P91 Square hollow section

Sizing Chart of UNS K11522 Seamless Pipe

O.D. x Thickness(mm) O.D x Thickness(mm) O.D x Thickness(mm)
38.1 x 3.2 57.0 x 4.9 76.2 x 4.0
38.1 x 4.0 57.0 x 6.3 76.2 x 5.0
38.1 x 6.3 57.0 x 7.9 76.2 x 6.3
42.4 x 3.2 60.3 x 3.2 82.5 x 4.5
42.4 x 4.0 60.3 x 3.6 88.9 x 3.2
44.5 x 3.2 60.3 x 5.0 88.9 x 3.6
44.5 x 6.3 63.5 x 3.2 88.9 x 4.0
48.3 x 3.2 63.5 x 3.6 101.6 x 3.6
48.3 x 3.6 63.5 x 4.0 101.6 x 4.5
50.8 x 4.5 63.5 x 6.3 101.6 x 6.3
51.0 x 3.2 63.5 x 7.9 114.3 x 3.6
51.0 x 3.6 70.0 x 3.2 114.3 x 5.0
51.0 x 6.3 70.0 x 3.6 139.7 x 4.0
57.0 x 3.2 70.0 x 6.3 139.7 x 5.0
57.0 x 3.6 76.2 x 3.6 139.7 x 6.3