Alloy Steel P91 Pipes

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Thabiso Steel, a prominent manufacturer and supplier located in Cape Town, South Africa, specializes in top-notch **Alloy Steel P91 Pipes** that are engineered for high-temperature, high-pressure, and heavy-duty industrial applications. These pipes are crafted with precision to provide outstanding strength, creep resistance, and durability, ensuring they perform reliably even in the toughest conditions. Adhering to international standards, Thabiso Steel promises consistent mechanical performance and a long lifespan. Catering to sectors like power generation, petrochemical, and oil and gas, the company offers Alloy Steel P91 Pipes that blend operational efficiency, structural integrity, and toughness, making them a go-to choice for critical industrial piping needs throughout South Africa.

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Alloy Steel P91 Seamless Pipes

Alloy Steel Gr P91 Welded Pipes

Alloy Steel Grade P91 EFW Pipes

Table of Contents

What is Alloy Steel P91 Pipes?

**Alloy Steel P91 Pipes** are made from high-quality alloy steel, with carefully balanced amounts of chromium, molybdenum, and vanadium to boost tensile strength, hardness, and creep resistance at high temperatures. These pipes showcase impressive yield and tensile strength, excellent impact resistance, and stability in high-pressure and high-temperature situations. Their fine-grain microstructure ensures they are weldable, tough, and durable over the long haul, making Alloy Steel P91 Pipes perfect for demanding applications in power generation, petrochemical, and other industries that require superior mechanical and thermal properties.

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alloy steel pipes

Alloy Steel P91 Pipes Specification

Type Seamless / ERW / Welded / Fabricated
Standard ASTM A335 P91, SA335 P91 (with IBR Test Certificate)
Size 1/2” NB to 36” NB
Length Standard Double & In Cut length also.
Schedules SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules
Tolerance Cold drawn pipe: +/-0.1mm
Cold rolled pipe: +/-0.05mm
Application Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
End Plain End, Beveled End, Treaded
Craft Cold rolled and Cold drawn
available in Form of Round, Square, Rectangular, Hydraulic Etc.
Origin European, Japanese, Korean, US, Russian, Indian (Strictly No Chinese Material)
Specialized in Large Diameter ASTM A335 P91 Pipe
Additional Testing NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc.
Thickness 3-12mm

Alloy Steel P91 Pipes Chemical Composition

Alloy Steel P91CCrMnMoPSSi
0.08-0.128.00 – 9.500.30-0.600.85 – 1.050.020 max0.010 max0.20 -0.50

Alloy Steel P91 Pipes Mechanical Properties

Tensile Strength, MPaYield Strength, MPaElongation
585 min415 min20 min

If You Are Looking To Buy High Quality Pipes, Sheet, Fittings and Flanges

We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.

Top Manufacturer and Supplier of Alloy Steel P91 Pipes in Cape Town, South Africa

ThabisoSteel is a major manufacturer and a supplier of premium Alloy Steel P91 pipe in Cape Town, the South Africa. With specialization in steel solutions, we offer a variety of products including carbon steel, alloy steel, light steel and galvanized steel. Our wide bearing has pipes, pipes, flanges, pipe fittings, forged fittings, sheets and plates. We are famous for our reliable distribution and extraordinary customer service, and are committed to offering high quality steel materials that ensure durability and better performance in different industrial applications. We are committed to skill, and we are your reliable partners for all steel requirements.

Alloy Steel P91 Pipes Equivalent Grades

ASTMASMEEquivalent materialJIS G 3458UNSBSDINISOABSNKLRS
A335 P91SA335 P91T91, K90901, X10CrMoVNb9-1, 1.4903 K91560      

ASTM A335 P91 Pipe Size Chart

O.D.(mm) x Thickness(mm)O.D(mm) x Thickness(mm)O.D(mm) x Thickness(mm)
38.1 x 3.257.0 x 4.976.2 x 4.0
38.1 x 4.057.0 x 6.376.2 x 5.0
38.1 x 6.357.0 x 7.976.2 x 6.3
42.4 x 3.260.3 x 3.282.5 x 4.5
42.4 x 4.060.3 x 3.688.9 x 3.2
44.5 x 3.260.3 x 5.088.9 x 3.6
44.5 x 6.363.5 x 3.288.9 x 4.0
48.3 x 3.263.5 x 3.6101.6 x 3.6
48.3 x 3.663.5 x 4.0101.6 x 4.5
50.8 x 4.563.5 x 6.3101.6 x 6.3
51.0 x 3.263.5 x 7.9114.3 x 3.6
51.0 x 3.670.0 x 3.2114.3 x 5.0
51.0 x 6.370.0 x 3.6139.7 x 4.0
57.0 x 3.270.0 x 6.3139.7 x 5.0
57.0 x 3.676.2 x 3.6139.7 x 6.3

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Types of Alloy Steel P91 Pipes

Gr P91 Alloy Steel Hydraulic Pipes
Alloy Steel P91 Rectangular Pipe
Alloy Steel P91 Hexagonal Pipe
P91 Alloy Steel Hollow Pipes
Alloy Steel Grade P91 Round Pipe
Gr.P91 Alloy Steel Square Pipe

Alloy Steel P91 Pipes Weight Chart

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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Uses of Alloy Steel P91 Pipes

**Alloy Steel P91 Pipes** are extensively utilized in sectors that need strong, heat-resistant, and durable piping solutions. They’re commonly found in power plant boilers, steam pipelines, petrochemical facilities, and oil and gas refineries. Moreover, they are essential in high-pressure piping systems, industrial machinery, and structural frameworks where creep resistance, toughness, and thermal stability are vital. The combination of mechanical strength, corrosion resistance, and long-term reliability ensures safe and efficient operation, making Alloy Steel P91 Pipes the ideal choice for demanding industrial applications.

 

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Oil and Gas Industry

petrochemical industry

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