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ASTM A213 T91 Pipe & Tubes

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Alloy Steel ASTM A213 T91 Pipe Manufacturer & Supplier

ASTM A213 T91 Pipe & Tubes

Sachin Steel is a leading manufacturer, exporter, and supplier of high-quality Alloy Steel T91 Tubes (ASTM A213 / ASME SA213). These tubes are primarily martensitic-ferritic steel alloys composed of chromium-molybdenum, often micro-alloyed with vanadium and niobium for enhanced strength and durability. The nitrogen content is strictly controlled according to industrial standards to ensure consistent performance.

T91 tubes are specifically designed for high-temperature applications, making them ideal for boilers, superheaters, and other critical components in power plants and industrial setups. The alloy exhibits exceptional creep resistance, high-temperature strength, and thermal fatigue resistance, performing reliably in environments up to 600°C. In addition, the chromium content provides excellent oxidation and corrosion resistance, while the steel’s high heat transfer efficiency and low thermal expansion make it highly suitable for demanding industrial operations.

Manufactured in seamless form through hot-rolled or cold-drawn processes, T91 tubes offer superior quality compared to conventional carbon steel tubes. These tubes are widely used in industries requiring precision, reliability, and long service life, including the energy, chemical, and petrochemical sectors.

At Sachin Steel, we provide a comprehensive range of ASTM A213 T91 and ASME SA213 T91 tubes with global certifications, ensuring both quality and timely delivery. Our tubes are engineered to meet the most stringent industrial standards, combining mechanical strength, durability, and corrosion resistance in one high-performance product.

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Table Of Content

What is Alloy Steel ASTM A213 T91 Pipe?

ASTM A213 T91 Pipes are high-performance alloy steel pipes widely used in high-temperature and high-pressure applications such as boilers, superheaters, and heat exchangers. Made from chromium-molybdenum steel and often micro-alloyed with vanadium and niobium, these pipes deliver exceptional creep strength, thermal fatigue resistance, and high-temperature durability. The controlled nitrogen content and alloy composition provide superior corrosion and oxidation resistance, making them reliable in critical industrial environments.

Types of Alloy Steel ASTM A213 T91 Pipe

seamless-pipes

ASTM A213 T91 Seamless Tube

seamless-tubes

ASTM A213 T91 Heat Exchanger Tube

erw

ASTM A213 T91 Hot Finished Tube

Rectangular Pipe

ASTM A213 T91 material Cold Drawn Tube

Welded Tube

ASTM A213 T91 High Pressure Tube

Square Pipe

ASTM A213 T91 Heater Tube

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A213 T91 Hot Finished Tube and SA 213 T91 Heat Exchanger Tube, Check actual outside diameter & NPS of T91 Tube Material according to ANSI/ ASME B36.10M

ASTM A213 T91 Tube Specification

SpecificationDetails
StandardASTM A213, ASME SA213
GradeT91 (UNS K90901)
Product DescriptionSeamless CSEF 9Cr-1Mo-VNb Alloy Steel Tubes
Manufacturing ProcessHot finished or Cold drawn + Heat Treatment
Heat TreatmentNormalized ≥ 1040°C, Tempered ≥ 730°C
Outside Diameter (OD)1/2″ (12.7mm) to 5″ (127mm)
Wall Thickness (WT)Sch 40, Sch 80, Sch 160, XXS & custom

ASTM A213 T91 Tubes Chemical Composition (wt %)

ElementContent (wt %)
Carbon (C)0.08 – 0.12
Manganese (Mn)0.30 – 0.60
Phosphorus (P)0.020 max
Sulfur (S)0.010 max
Silicon (Si)0.20 – 0.50
Chromium (Cr)8.00 – 9.50
Molybdenum (Mo)0.85 – 1.05
Vanadium (V)0.18 – 0.25
Niobium (Nb)0.06 – 0.10
Nitrogen (N)0.030 – 0.070
Aluminum (Al)0.02 max (typically 0.04 for some specs)

Alloy T91 Tubes Equivalent Grades

STANDARD WERKSTOFF NR. UNS
A213 T91 1.4903 K91560

Tolerance of T91 Steel Tubing

Outside Diameter OD Tolerance WT Tolerance Ovality Tolerance Cut Length Tolerance
OD≤ 12, 7 mm ± 0, 13 mm ± 15 % – + 3, 18 mm, – 0 mm
12, 7 mm < OD ≤ 38, 1 mm ± 0, 13 mm ± 10 % max, 1, 65 mm + 3, 18 mm, – 0 mm
38, 1 mm < OD ≤ 88, 9 mm ± 0, 25 mm ± 10 % max, 2, 41 mm + 4, 76 mm, – 0 mm

Mechanical Properties of ASTM A213 T91 Tubes

PropertyValue (Minimum, unless stated)
Tensile Strength85,000 psi (585 MPa)
Yield Strength58,000 psi (400 MPa)
Elongation (in 2in/50mm)20%
HardnessRockwell B: 97 max / Brinell: 250 max (varies slightly with spec edition)

Alloy Steel A213 T91 Tubing Outside Diameter And Tolerance

Outside Diameter (OD) & Wall Thickness (WT) As per the ranges specified in the ASTM A213 T91 Tube Specifications section, catering to diverse high-performance design needs.
Tolerances Strictly in accordance with ASTM A1016/A1016M.
Lengths Standard lengths of 6 meters (20 ft) and 12 meters (40 ft) are available. Custom cut-to-length services are also offered.

ASTM A213 T91 Boiler Tube 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

Gr T91 Tubing Wall Thickness & Tolerance :

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

Alloy Steel ASTM A213 T91 Uses

    • Petrochemical Industry
    • Chemical Industry
    • Oil and Gas Industry
    • Pulp & Paper Indusry
    • Power Plant Industry
    • Food Processing Industry
    • Pharmaceuticals Industry
    • Energy Industry
    • Aerospace Industry
Application Industries

FAQs About Alloy Steel ASTM A213 T91 Pipe

ASTM A213 is a standard specification for seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes. It defines the material composition, mechanical properties, and manufacturing requirements to ensure the tubes perform reliably under high-temperature and high-pressure conditions.

T91 is a chromium-molybdenum (Cr-Mo) alloy steel grade, often micro-alloyed with vanadium and niobium. It is widely used for high-temperature, high-pressure applications due to its excellent creep strength, thermal fatigue resistance, and corrosion resistance. T91 is commonly supplied in ASTM A213 / ASME SA213 seamless tubes and pipes.

T91 is a low alloy steel used primarily for boiler tubes, superheater tubes, and pressure parts in power plants and industrial boilers. It offers good high-temperature strength and resistance to thermal fatigue, making it suitable for moderate-pressure and temperature applications.

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