ASTM A335 P91 pipe

ASTM A335 P91 pipe manufacturer in India
ISO Certified Manufacturer

ASTM A335 P91 is a seamless ferritic/martensitic alloy steel pipe manufactured per ASTM A335 / ASME SA335 for high-temperature, high-pressure service. The P91 grade contains 8.00–9.50% chromium and 0.85–1.05% molybdenum with additions of vanadium, niobium, and nitrogen, delivering exceptional creep strength and long-term stability at temperatures up to 650°C.

P91 alloy steel pipes are used in ultra-supercritical boilers, advanced power generation systems, and high-pressure steam piping where conventional alloys fall short. Applications include main steam lines, hot reheat lines, superheaters, and headers in modern thermal and combined-cycle power plants.

Spark Steel supplies ASTM A335 P91 seamless pipes with tensile strength minimum 585 MPa and yield strength minimum 415 MPa, available from ½" to 24" NPS in wall thicknesses per ASME B36.10. Supplied in normalized and tempered condition with full heat treatment records, chemical analysis, and mechanical test reports. Positive material identification (PMI) testing available on request.

20+
Years of Experience
50+
Grades in Stock
1/8"–2–4"
Size Range
100%
Quality Tested

P91 pipe material specification

P91 pipe material specification

SPECIFICATIONDETAILS
Pipe endPlain, Beveled End
Size1/2 inch to 24 inch NB
Wall thickness2 mm to 14 mm
CoatingFBE coating, Varnished coating, Galvanized coating, Blacking painting, 3LPE coating
Surface finishBright, Cold Finish, BA Finish, No.4 finish, Annealing, Polished, Pickling
Value added serviceHeat treating, Ut test, Polishing, Beveling
ASTM A335 P91 pipe
SA 335 gr P91 seamless pipe
SA335 P91 welded pipe
P91 chrome pipe
A335 gr P91 ERW pipe
A335P91 EFW pipe

Thickness chart of SA335 P91 welded pipe

Thickness chart of SA335 P91 welded pipe

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

P91 pipe price

P91 pipe price

Description Price in USD Price in Kilogram (INR)
Astm A335 P91 Pipe, Thickness: 3.5 mm - 25 mm, Size: 1/2 inch $ 2.44 ₹ 210
Astm A335 Gr P91 Pipes, Nominal Size: 3 inch $ 1.16 ₹ 100
ASTM A335 P91 Alloy Steel Pipe, Nominal Size: 4 Inch $ 9.31 ₹ 800

Test certificate of P91 seamless pipe

  • EN 10204 3.1
  • PMI Test Reports
  • Mechanical Reports
  • Mill Test Certificates
  • Chemical Reports
  • Visual Inspection Reports

P91 pipe weight chart

P91 pipe weight chart

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

P91 chrome pipe welding procedure

  • Flux cored arc welding (FCAW) process
  • Mig Process
  • MAG-welding cored wire
  • Arc welding (E)
  • MAG-welding massive wire
  • Submerged arc welding (SAW)
  • TIG-welding

A335 Gr P91 ERW pipe extrusion process

A335 Gr P91 ERW pipe extrusion process

Application of ASTM A335 P91 alloy steel chrome moly pipes

  • Gas processing equipment
  • Oil services
  • Heaters/reheat lines
  • Petrochemical plants
  • Power generation
  • Boilers

ASTM A335 P91 chemical composition

ASTM A335 P91 chemical composition

Mn % P % C % S % Cr % Mo % Si %
0.30-0.60 0.025 max 0.05-0.15 0.025 max 1.00-1.50 0.44-0. 0.50-1.00

A335P91 EFW pipe mechanical properties

A335P91 EFW pipe mechanical properties

Tensile Strength Elongation Yield Strength
415 MPa-min 30 % min 205 MPa-min

P91 chrome pipe equivalent grades

P91 chrome pipe equivalent grades

ASTM UNS Equivalent material ASME
P91 pipes K91560 K90901, T91, 1.4903, X10CrMoVNb9-1 ASME SA335 P91 pipes

P91 pipe schedule chart

P91 pipe schedule chart

NPS in inch 1/2 3/4 2 3 1 1 1/4 4 6 12 16 10 20 24
Sched 40 .109 .113 .154 .216 .133 .14 .237 .28 .406 .5 .365 .5 .5
Sched 10 .06 .06 .09 .12 .065 .08 .12 .12 .145 .145 .145 .145 .2
Sched 20 .109 .113 .154 .216 .133 .14 .237 .28 .406 .5 .365 .6 .7
Sched 80 .147 .154 .218 .3 .179 .2 .337 .432 .5 .5 .5 .5 .5
Sched 160 .2 .3 .5 .5 .25 .375 .5 .5 .5 .5 .5 .5 .5

Temperature rating of alloy P91 hot finished seamless pipe

Temperature rating of alloy P91 hot finished seamless pipe

Pipe Grade Temperature Range F [C] Normalizing Temperature Range F [C]
A335 P91 1350-1470 F [730 - 800 C] 1900-1975 F [1040 - 1080 C]
1350-1470 F [730 - 800 C] 1900-1975 F [1040 - 1080 C]

SA 335 P91 boiler pipe sizes

SA 335 P91 boiler pipe sizes

OD (inches) OD (mm) Sch 80 WT (mm) Sch 40 WT (mm) Sch 160 WT (mm)
4 114.3 8.56 6.02 13.49
6 168.3 10.97 7.11 18.26
1 33.4 4.55 3.38 6.35
2 60.3 5.54 3.91 8.74
3 88.9 7.62 5.49 11.13
8 219.1 12.70 8.18 23.01
10 273.1 15.09 9.27 28.58
12 323.9 17.48 9.53 33.32

ASTM A335 Gr P91 high pressure pipe od tolerance

ASTM A335 Gr P91 high pressure pipe od tolerance

A335 Pipe Over Under
NPS [DN] in. milimeter in. mm
Over 4 to 8 / DN 100 to 200 1/16 (0.062) 1.59 1/32 (0.031) 0.79
1/8 to 1 1/2 / DN 6 to 40 1/64 (0.015) 0.4 1/64 (0.015) 0.4
Over 1 1/2 to 4 / DN 40 to 100 1/32 (0.031) 0.79 1/32 (0.031) 0.79
Over 8 to 12 / DN 200 to 300 3/32 (0.093) 2.38 1/32 (0.031) 0.79
Over 12 / > DN 300 +/- 1% of the specified outside diameter

SA 335 Gr P91 round pipe creep properties

SA 335 Gr P91 round pipe creep properties

Temp. Cree
strength 		Tim
limit
 Cree
strength
10 000h Rp0.2
 100 000h
° C N / m/ ksi N / m/ ksi N / m/ ksi
550/1022 199 / 28,8 270 / 39.1 166 / 24.0
600/1112 122 / 17.6 215 / 31,1 94 / 13.6
20/68 450/65
100/212 410 / 59.4
300/572 360 / 52,2
500/932 289 / 41.9 300 / 43.5 258 / 37.4
650/1202 70 / 10,1 49 / 7,1

P91 vs P22

P91 vs P22

Mechanical Property P22 P91
Elongation (min) 20% 20%
Hardness (Brinell) ~200 HB (typical) ≤ 250 HB
Tensile Strength (min) 415 MPa 620 MPa
Yield Strength (min) 205 MPa 415 MPa
Creep Resistance Moderate Excellent
Max Operating Temperature ~540–570°C ~650–675°C

SA335 P91 pipe elogation

SA335 P91 pipe elogation

Wall Thickness P91
inch MM Longitudinal
3/16 (0.188) 4.8 16
1/4 (0.250) 6.4 18
9/32 (0.281) 7.2 19
1/18 (0.062) 1.6 12
5/16 (0.312) 8 20
7/32 (0.219) 5.6 17
5/32 (0.156) 4 15
3/32 (0.094) 2.4 13
7/8 (0.125) 3.2 14

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