Alloy Steel P91 Pipes Manufacturer and Supplier in Bangkok, Thailand

Alloy Steel P91 Pipes

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Phanuphong Steel and Plates, located in Bangkok, Thailand, has earned a solid reputation as a reliable manufacturer and supplier of top-notch Alloy Steel P91 Pipes, designed to meet a variety of industrial needs. Known for its meticulous engineering and rigorous quality control, the company delivers pipes that adhere to international standards, guaranteeing both durability and reliability. With a strong focus on customer satisfaction, Phanuphong Steel and Plates provides an extensive selection of sizes and specifications, making it the perfect partner for industries like power generation, oil and gas, and chemical processing, where performance under high temperature and pressure is essential.

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Alloy Steel P91 Seamless Pipes

Alloy Steel Gr P91 Welded Pipes

Alloy Steel Grade P91 EFW Pipes

What is Alloy Steel P91 Pipes?

Alloy Steel P91 Pipes are mainly made up of chromium, molybdenum, and trace amounts of vanadium and niobium, which boost their strength at high temperatures and resistance to corrosion. These pipes showcase impressive mechanical properties, boasting a tensile strength of about 585–690 MPa, a yield strength of around 415 MPa, and an elongation of 20–25%. The material remains stable at elevated temperatures up to 600°C, providing excellent creep resistance and hardness. These features make P91 pipes incredibly dependable for challenging industrial applications, blending toughness, ductility, and long-lasting performance under stress.

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

Alloy Steel P91 Pipes Mechanical Properties

Tensile Strength, MPa	Yield Strength, MPa	Elongation
585 min	415 min	20 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 Bangkok, Thailand

Phanuphong Steel is a major manufacturer and a supplier of premium Alloy Steel P91 pipe in Bangkok, the Thailand. 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

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 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 3.2	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

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Types of Alloy Steel P91 Pipes

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 find extensive use in power plants, especially for superheater and boiler tubes, thanks to their capacity to endure high temperatures and pressures. They are also crucial in the oil and gas sector for pipelines, heat exchangers, and petrochemical equipment, ensuring both safety and efficiency. Additional applications include chemical plants, refineries, and industrial machinery where heat resistance, durability, and corrosion protection are vital. P91 pipes offer long-term operational reliability, lower maintenance costs, and facilitate smooth industrial processes, making them a favored choice for engineers and project designers in high-performance industries.