ASTM A335 Grade P91 Alloy Steel Seamless Pipes and Tubes Supplier

Alloy Steel P91 Pipes and Tubes Manufacturer, Supplier and Exporter in India

Solitaire Overseas is a leading provider of high-quality industrial products, we specialize in supplying ASTM A335 P91 Pipes and materials. Engineered for superior performance in high-temperature and demanding environments, our P91 pipe inventory is sourced from approved international manufacturers and designed to meet the highest industry standards. We offer a comprehensive solution for all your P91 material needs, from high-energy pipes and fittings to valves and flanges.

For reliable and high-performance solutions, look no further than Solitaire Overseas. Whether you require robust Alloy Steel P91 Pipes or a broader selection of high-quality Alloy Steel Tubes, our commitment to quality and customization ensures your project's success. Contact us today to discuss your specific needs and experience the difference of working with a trusted industry leader.

ASTM A335 Grade P91 is a chrome moly alloy renowned for its exceptional strength and temperature resistance. It is classified as a creep-strength-enhanced ferritic (CSEF) steel, specifically designed to withstand prolonged exposure to high temperatures without deforming. The material's durability and superior creep strength are a direct result of its carefully controlled heat treatment process.

The P91 designation signifies a specific composition of approximately 9% Chromium and 1% Molybdenum, along with minor additions of vanadium. Chromium enhances temperature strength and oxidation resistance, while Molybdenum improves elasticity and high-temperature creep strength. To achieve these optimal properties, our ASTM A335 P91 pipes undergo a rigorous heat treatment process, which includes normalization at 1050 °C, air cooling to 200 °C, and tempering at 760 °C.

Enquire Now

Table of Content

Specification of Alloy Steel P91 Pipes
Alloy Steel P91 Pipes Equivalent Grades
Alloy Steel P91 Pipes Chemical Composition
Alloy Steel P91 Pipes Mechanical & Physical Properties
ASTM A335 P91 Pipe Size Chart
ASTM A335 P91 Pipe Weight Chart
Types of ASTM A335 Alloy Steel P91 Pipe
Applications of Alloy Steel P91 Pipes and Tubes
Related Products
Frequently Asked Questions About Alloy Steel P91 Pipes and Tubes

We offer both ASTM A335 P91 Seamless Pipe and ASTM A335 P91 Welded Pipe to meet the diverse needs of your applications, delivering exceptional longevity and a smooth finish.

ASTM A335 P91 Pipe

ASTM A335 P91 pipe is a type of high-strength, ferritic alloy steel pipe that is commonly used in power plants and other high-temperature applications. It is known for its excellent creep resistance and high-temperature strength.

ASTM A335 P91 Welded Pipe

ASTM A335 P91 welded pipe is a type of ASTM A335 P91 pipe that is manufactured by welding together two or more pieces of steel. Welded pipe is typically less expensive than seamless pipe, but it may not be as strong or durable.

ASTM A335 P91 Seamless Pipe

ASTM A335 P91 seamless pipe is a type of ASTM A335 P91 pipe that is manufactured without any welds. Seamless pipe is typically more expensive than welded pipe, but it is also stronger and more durable.

Alloy Steel P91 Pipes Specification

We provide a comprehensive overview of the technical specifications for our Alloy Steel P91 pipes, ensuring they meet international standards for quality and performance. Our inventory is available in a variety of sizes, dimensions, and schedules to suit your project needs.

Specifications	Details
Specification	ASTM A335 / ASME SA335
Dimensions	ASTM, ASME and API
Pipe Size	1/8" NB to 26" NB IN
Outer Diameter	6-2500mm; WT:1-200mm
Thickness	0.3mm – 50 mm
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Types	Seamless
End	Plain End, Beveled End, Treaded
Length	Single Random, Double Random & Required Length
Thickness	0.095″ – 1.000″ (.2.5-25mm)
Form	Seamless Pipe

Alloy Steel P91 Pipes Equivalent Grades

Our Alloy Steel P91 pipes are certified to meet equivalent grades across various international standards, ensuring seamless integration into global projects. The table below outlines the corresponding UNS and Werkstoff Nr. designations.

STANDARD	UNS	WERKSTOFF NR.
Alloy Steel P91	K91560	1.4903

Alloy Steel P91 Pipes Chemical Composition

The unique properties of Alloy Steel P91 are a result of its precise chemical composition. The controlled percentages of chromium and molybdenum provide exceptional resistance to high-temperature creep and oxidation, making it ideal for demanding environments.

Element	Alloy Steel P91 (%)
C	0.08-0.12
Mn	0.30-0.60
P	0.020 max
S	0.010 max
Si	0.20 -0.50
Cr	8.00 - 9.50
Mo	0.85 - 1.05

Alloy Steel P91 Pipes Mechanical & Physical Properties

Our Alloy Steel P91 pipes are manufactured to provide superior mechanical and physical properties. This grade is specifically engineered for high tensile strength, excellent yield strength, and good elongation, ensuring durability and reliability in high-pressure systems.

Element	Alloy Steel P91
Tensile Strength	585 min MPa
Yield Strength (0.2% Offset)	415 min MPa
Elongation	20 %

ASTM A335 P91 Pipe Size Chart

This chart details the most common outer diameter and wall thickness combinations available for our ASTM A335 P91 pipes. These dimensions are critical for ensuring proper fit and performance in various applications.

O.D. (mm) x Thickness (mm)	O.D. (mm) x Thickness (mm)	O.D. (mm) 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

ASTM A335 P91 Pipe Weight

This chart provides crucial data on the weight per linear foot of our ASTM A335 P91 pipes. This information is essential for planning, logistics, and engineering calculations.

Size NPS	Pipe O.D. (in)	Wall Thickness (in)	Pipe I.D. (in)	Weight per Foot (lbs)
1/2	0.84	0.109	0.622	0.85
1/2	0.84	0.147	0.546	1.09
1/2	0.84	0.188	0.464	1.31
1/2	0.84	0.294	0.252	1.72
3/4	1.05	0.113	0.824	1.13
3/4	1.05	0.154	0.742	1.48
3/4	1.05	0.219	0.612	1.95
3/4	1.05	0.308	0.434	2.44
1	1.315	0.133	1.049	1.68
1	1.315	0.179	0.957	2.17
1	1.315	0.250	0.815	2.85
1	1.315	0.358	0.599	3.66
1 1/4	1.66	0.140	1.380	2.27
1 1/4	1.66	0.191	1.278	3.00
1 1/4	1.66	0.250	1.160	3.77
1 1/4	1.66	0.382	0.896	5.22
1 1/2	1.90	0.145	1.610	2.72
1 1/2	1.90	0.200	1.500	3.63
1 1/2	1.90	0.281	1.338	4.86
1 1/2	1.90	0.400	1.100	6.41
2	2.375	0.109	2.157	2.64
2	2.375	0.154	2.067	3.66
2	2.375	0.218	1.939	5.03
2	2.375	0.250	1.875	5.68
2	2.375	0.281	1.813	6.29
2	2.375	0.344	1.687	7.47
2	2.375	0.436	1.503	9.04
2 1/2	2.875	0.120	2.635	3.53
2 1/2	2.875	0.203	2.469	5.80
2 1/2	2.875	0.216	2.443	6.14
2 1/2	2.875	0.250	2.375	7.02
2 1/2	2.875	0.276	2.323	7.67
2 1/2	2.875	0.375	2.125	10.02
2 1/2	2.875	0.552	1.771	13.71
3	3.50	0.120	3.260	4.34
3	3.50	0.156	3.188	5.58
3	3.50	0.172	3.156	6.12
3	3.50	0.188	3.124	6.66
3	3.50	0.216	3.068	7.58
3	3.50	0.250	3.000	8.69
3	3.50	0.281	2.938	9.67
3	3.50	0.300	2.900	10.26
3	3.50	0.438	2.624	14.34
3	3.50	0.600	2.300	18.6
3 1/2	4.0	0.120	3.760	4.98
3 1/2	4.0	0.226	3.548	9.12
3 1/2	4.0	0.250	3.500	10.02
3 1/2	4.0	0.281	3.438	11.17
3 1/2	4.0	0.318	3.364	12.52
3 1/2	4.0	0.636	2.728	22.87
4	4.5	0.120	4.260	5.62
4	4.5	0.156	4.188	7.24
4	4.5	0.188	4.124	8.67
4	4.5	0.203	4.094	9.32
4	4.5	0.219	4.062	10.02
4	4.5	0.237	4.026	10.80
4	4.5	0.250	4.000	11.36
4	4.5	0.281	3.938	12.67
4	4.5	0.312	3.876	13.97
4	4.5	0.337	3.826	15.00
4	4.5	0.438	3.624	19.02
4	4.5	0.531	3.438	22.53
4	4.5	0.674	3.152	27.57
5	5.563	0.188	5.187	10.80
5	5.563	0.219	5.125	12.51
5	5.563	0.258	5.047	14.63
5	5.563	0.281	5.001	15.87
5	5.563	0.312	4.939	17.51
5	5.563	0.344	4.875	19.19
5	5.563	0.375	4.813	20.80
5	5.563	0.500	4.563	27.06
5	5.563	0.625	4.313	32.99
5	5.563	0.750	4.063	38.59
6	6.625	0.109	6.407	7.59
6	6.625	0.134	6.357	9.30
6	6.625	0.156	6.313	10.79
6	6.625	0.188	6.249	12.94
6	6.625	0.203	6.219	13.94
6	6.625	0.219	6.187	15.00
6	6.625	0.250	6.125	17.04
6	6.625	0.280	6.065	18.99
6	6.625	0.312	6.001	21.06
6	6.625	0.344	5.937	23.10
6	6.625	0.375	5.875	25.05
6	6.625	0.432	5.761	28.60
6	6.625	0.500	5.625	32.74
6	6.625	0.562	5.501	36.43
6	6.625	0.625	5.375	40.09
6	6.625	0.719	5.187	45.39
6	6.625	0.864	4.897	53.21
6	6.625	1.000	4.625	60.13
6	6.625	1.125	4.375	66.14

Types of ASTM A335 Alloy Steel P91 Pipe

Alloy Steel P91 Pipes — P91 Alloy Steel A335 Pipe
AISI P91 ERW pipes — ASTM A335 P91 Pipes
ASTM A335 grade P91 Pipes — ASTM A335 P91 Alloy Steel Seamless Pipes
High Quality Grade P91 Alloy Steel Pipes — P91 Pipes Dealer
grade P91 Alloy Steel Hydraulic Pipe — Alloy Steel Gr P91 LSAW Pipes
P91 Alloy Pipe — ASME SA / ASTM A335 P91 Pipes
ASME SA 335 Alloy Steel P91 Seamless Pipe — IBR Alloy Steel P91 Pipes
Alloy A335 P91 Seamless Square Pipe — ASME SA335 P91 Alloy Steel Rectangular Pipe

Applications of Alloy Steel P91 Pipes and Tubes

Alloy Steel P91 pipes are specifically designed for high-temperature and high-pressure applications where strength and resistance to creep and oxidation are critical. Key industries and uses include:

Power Generation: Used in boilers, superheaters, and reheater lines.

Gas Processing Equipment: Ideal for systems handling hot, high-pressure gases.

Oil and Petrochemical Plants: Employed in refinery furnaces, heat exchangers, and process piping.

Heaters and Boilers: Essential components in industrial heating systems.

Frequently Asked Questions About Alloy Steel P91 Pipes and Tubes

What is P91 pipe material?

Alloy Steel P91 is a high-strength, heat-resistant material commonly used in power generation and petrochemical industries. It is a ferritic alloy made with chromium, molybdenum, and vanadium, which gives it excellent high-temperature strength, corrosion resistance, and good weldability.

What is the difference between P91 Type 1 and Type 2?

Compared to P91 Type 1, P91 Type 2 has more stringent chemical composition requirements. This results in superior corrosion and creep resistance under high temperatures and pressure, making it the preferred choice for more demanding applications.

What is the thickness of a P91 pipe?

The thickness of a P91 pipe varies depending on its schedule and outer diameter. Common schedules range from Sch 20 to XXS, with typical wall thicknesses from 2mm to 14mm.

What is the difference between P22 and P91 material?

The primary difference lies in their chemical composition. P22 contains 2.5% chromium and 1% molybdenum, whereas P91 contains a much higher percentage of chromium (9%) and 1% molybdenum. The increased chromium and specific heat treatment of P91 enhance its creep strength, making it a "creep-strength-enhanced ferritic" (CSEF) material, ideal for applications requiring superior strength at extreme temperatures.

What is the hardness range of P91?

The standard hardness range for P91 steel is typically between 190 and 250 HB (Brinell Hardness). The ASTM A335/ASME SA-335 standard specifies that the maximum hardness should not exceed 250 HB.