Alloy Steel F91 Flanges, ASTM A182 CrMo F91 Weld Neck Flange

Alloy Steel A182 F91 Flanges

ASTM A182 Alloy Steel F91 Flanges Manufacturer, UNS K90901 Weld Neck Flange, ASTM A182 F91 Slip-on Flange, WNR 1.4903 Lap Joint Flange, Cr-Mo F91 Blind Flange

F91 flanges are a type of flange made from ASTM A182 Grade F91 material, which is a low alloy steel containing chromium and molybdenum. F91 flanges are commonly used in high-pressure and high-temperature applications, such as in oil and gas, chemical, and power generation industries.

F91 flanges are typically available in various sizes and pressure ratings, and they can be manufactured in various types such as weld neck, slip-on, socket weld, and threaded. They are designed to connect pipes or equipment, allowing for easy assembly and disassembly.

One of the key advantages of using F91 flanges is their high resistance to corrosion and erosion, making them ideal for use in harsh environments. They also offer high strength and durability, which ensures their long-term reliability in demanding applications.

When selecting F91 flanges, it is important to consider factors such as temperature, pressure, and media compatibility to ensure that the chosen flange is suitable for the intended application. Additionally, proper installation and maintenance are crucial for ensuring the optimal performance of F91 flanges.

Specifications Material Grades Dimensions Weight Chart Pressure Chart Schedule Chart Applications

ASME / ANSI B16.5 Alloy Steel F91 RTJ Flange, PN10 PN16 Chromium Molybdenum Gr. F91 Threaded Flange, Table D & Table E Chrome Moly F91 Spectacle Blind Flange, ANSI 150 Alloy Grade F91 Socket Weld Flange at the Lowest Prices

Alloy Steel F91 Flange Specifications

Size Range

1/2″ (15 NB) to 48″ (1200NB)

Class / Pressure Rating

150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Standards / Dimensions

ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, BS, GOST, MSS SP-44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605

Connection Type

Ring Joint Flange (RTJ), Flat Face Flange (FF), Raised Face Flange (RF), Male and Female Flange (M & F), Lap Joint Flange, Large and Small Tongue-and-Groove Flange (T & G)

Material Standards

ASTM A182 / ASME SA182

Alloy Steel F91 Flanges Equivalent Grade

STANDARD	UNS	WERKSTOFF NR.	Trade Name
Alloy Steel F91	K90901	1.4903	9Cr-1Mo-V

ASTM A182 Alloy Steel Grade F91 Flanges Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo
Alloy Steel F91	0.08 – 0.12	0.3 – 0.6	0.5	0.01	0.02	8.5 – 9.5	0.85 – 1.05

Alloy Steel A182 F91 Flanges Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min
Alloy Steel F91	415	585	20

Find the largest ready stock of Class 300#, 600#, 900#, 1500#, 2500# Alloy Steel F91 Flanges, Cr-Mo F91 Weld Neck Flanges, Alloy Grade F91 Long Welding Neck Flange, F91 Alloy Steel Blind Flange, Alloy Steel F91 Weld Neck Flanges A / B, Chromium Molybdenum F91 Socket weld Flanges, F91 Alloy Steel Nipo Flanges, EN 1.4903 Flanges, Alloy Gr. F91 Expander Flanges at Best Price, F91 Chrome Moly Steel Forging Facing Flanges, Alloy Steel F91 Flanges Dimensions, Alloy F91 BS Standard Table E Flange, Chrome Moly UNS K90901 Lap Joint Flanges, ANSI B16.5 Alloy Steel F91 Pipe Flange in Mumbai, India.

A182 Alloy Steel F91 Flanges Dimensions & Size

Nominal Pipes Sizes	OD (Outside Dia) of Flange	Thickness	Dia of Raised Face	Dia of Hub at Base	Length Thru Hub			Dia or Bore		Dia of Hub at Bevel	Radius of Fillet	Depth of Socket
	OD (Outside Dia) of Flange	Thickness	Dia of Raised Face	Dia of Hub at Base	Welding Neck	Slip-On Threaded Socket	Lap Joint	Slip-on Socket	Lap Joint	Dia of Hub at Bevel	Radius of Fillet	Depth of Socket
	O	Q	R	X	Y	Y	Y	W	B	H	r	Z
1/2	3-1/2	7/16	1-3/8	1-3/16	1-7/8	5/8	5/8	.88	.90	.84	1/8	3/8
3/4	3-7/8	1/2	1-11/16	1-1/2	2-1/16	5/8	5/8	1.09	1.11	1.05	1/8	7/16
1	4-1/4	9/16	2	1-15/16	2-3/16	11/16	11/16	1.36	1.38	1.32	1/8	1/2
1-1/4	4-5/8	5/8	2-1/2	2-5/16	2-1/4	13/16	13/16	1.70	1.72	1.66	3/16	9/16
1-1/2	5	11/16	2-7/8	2-9/16	2-7/16	7/8	7/8	1.95	1.97	1.90	1/4	5/8
2	6	3/4	3-5/8	3-1/16	2-1/2	1	1	2.44	2.46	2.38	5/16	11/16
2-1/2	7	7/8	4-1/8	3-9/16	2-3/4	1-1/8	1-1/8	2.94	2.97	2.88	5/16	3/4
3	7-1/2	15/16	5	4-1/4	2-3/4	1-3/16	1-3/16	3.57	3.60	3.50	3/8	13/16
3-1/2	8-1/2	15/16	5-1/2	4-13/16	2-13/16	1-1/4	1-1/4	4.07	4.10	4.00	3/8	7/8
4	9	15/16	6-3/16	5-5/16	3	1-5/16	1-5/16	4.57	4.60	4.50	7/16	15/16
5	10	15/16	7.5/16	6-7/16	3-1/2	1-7/16	1-7/16	5.66	5.69	5.56	7/16	15/16
6	11	1	8-1/2	7-9/16	3-1/2	1-9/16	1-9/16	6.72	6.75	6.63	1/2	1-1/16
8	13-1/2	1-1/8	10-5/8	9-11/16	4	1-3/4	1-3/4	8.72	8.75	8.63	1/2	1-1/4
10	16	1-3/16	12-3/4	12	4	1-15/16	1-15/16	10.88	10.92	10.75	1/2	1-5/16
12	19	1-1/4	15	14-3/8	4-1/2	2-3/16	2-3/16	12.88	12.92	12.75	1/2	1-9/16
14	21	1-3/8	16-1/4	15-3/4	5	2-1/4	3-1/8	14.14	14.18	14.00	1/2	1-5/8
16	23-1/2	1-7/16	18-1/2	18	5	2-1/2	3-7/16	16.16	16.19	16.00	1/2	1-3/4
18	25	1-9/16	21	19-7/8	5-1/2	2-11/16	3-13/16	18.18	18.20	18.00	1/2	1-15/16
20	27-1/2	1-11/16	23	22	5-11/16	2-7/8	4-1/16	20.20	20.25	20.00	1/2	2-1/8
24	32	1-7/8	27-1/4	26-1/8	6	3-1/4	4-3/8	24.25	24.25	24.00	1/2	2-1/2

A182 Alloy Steel F91 Flanges Weight Chart

CLASS	Nominal Pipe Size	Slip On	Threaded	Socket Weld	Lap Joint	Blind	Weld Neck
150 lb	½	1	1	2	1	2	2
	¾	2	2	2	2	2	2
	1	2	2	2	2	2	3
	1¼	3	3	3	3	3	3
	1½	3	3	3	3	4	4
	2	5	5	5	5	5	6
	2½	8	8	8	8	7	10
	3	9	9	9	9	9	11.5
	3½	11	12	11	11	13	12
	4	13	13	13	13	17	16.5
	5	15	15	15	15	20	21
	6	19	19	19	19	27	26
	8	30	30	30	30	47	42
	10	43	43	43	43	70	54
	12	64	64	64	64	123	88
	14	90	90	90	105	140	114
	16	106	98	98	140	180	140
	18	130	130	130	160	220	165
	20	165	165	165	195	285	197
	22	185	185	185	245	355	225
	24	220	220	220	275	430	268

300 lb	½	2	2	3	2	2	2
	¾	3	3	3	3	3	3
	1	3	3	3	3	4	4
	1¼	4.5	4.5	4	4.5	6	5
	1½	6.5	6.5	6	6.5	7	7
	2	7	7	7	7	8	9
	2½	10	10	10	10	12	12
	3	13	14	13	14.5	16	18
	3½	17	17	17	17	21	20
	4	23.5	24	22	24	28	26.5
	5	29	31	28	28	37	36
	6	39	39	39	39	50	45
	8	58	58	58	58	81	69
	10	81	81	81	91	124	100
	12	115	115	115	140	185	142
	14	165	165	165	190	250	206
	16	210	220	190	234	315	250
	18	253	280	250	305	414	320
	20	315	325	315	375	515	400
	22	370	370	370	435	640	465
	24	490	490	475	550	800	580

400 lb	½	2	2	2	2	2	3
	¾	3	3	3	3	3	3.5
	1	3.5	3.5	3.5	3.5	4	4
	1¼	4.5	4.5	4.5	4.5	6	4.5
	1½	6.5	6.5	6.5	6.5	8	8
	2	8	8	8	8	10	10
	2½	12	12	12	11	15	14
	3	15	15	15	14	20	18
	3½	21	21	21	20	29	26
	4	26	26	26	25	33	35
	5	31	31	31	29	44	43
	6	44	44	44	42	61	57
	8	67	67	67	64	100	89
	10	91	91	91	110	155	125
	12	130	130	130	152	226	175
	14	191	191	191	210	310	233
	16	253	253	253	280	398	295
	18	310	310	310	345	502	360
	20	378	378	378	420	621	445
	22	405	405	405	455	720	505
	24	539	539	539	615	936	640

600 lb	½	2	2	2	2	3	3
	¾	3	3	3	3	4	4
	1	4	4	4	4	4	4
	1¼	5	5	5	5	6	6
	1½	7	7	7	7	8	8
	2	9	9	9	9	10	12
	2½	13	13	13	12	15	18
	3	16	16	16	15	20	23
	3½	21	21	21	20	29	26
	4	37	37	37	36	41	42
	5	63	63	63	63	68	68
	6	80	80	80	78	86	81
	8	115	115	115	112	140	120
	10	177	177	177	195	231	190
	12	215	215	215	240	295	226
	14	259	259	259	290	378	347
	16	366	366	366	400	527	481
	18	476	476	476	469	665	555
	20	612	612	612	604	855	690
	22	590	590	590	670	1000	720
	24	876	876	876	866	1250	977

900 lb	½	6	6	6	6	4	7
	¾	6	6	6	6	6	7
	1	7.5	7.5	7.5	7.5	9	8.5
	1¼	10	10	10	10	10	10
	1½	14	14	14	14	14	14
	2	22	22	22	21	25	24
	2½	31	31	31	25	32	31
	3	36	36	36	29	35	36
	4	53	53	53	51	54	53
	5	83	83	83	81	87	86
	6	110	110	110	105	115	110
	8	172	172	172	190	200	187
	10	245	245	245	277	290	268
	12	326	326	326	371	415	372
	14	400	400	400	415	520	562
	16	459	459	459	488	619	685
	18	647	647	647	670	880	924
	20	792	792	792	868	1107	1164
	24	1480	1480	1480	1659	2099	2107

1500 lb	½	6	6	6	6	4	7
	¾	6	6	6	6	6	7
	1	8	8	8	8	9	9
	1¼	10	10	10	10	10	10
	1½	14	14	14	14	14	14
	2	25	25	25	25	25	25
	2½	36	36	36	35	35	36
	3	48	48	48	47	48	48
	4	73	73	73	75	73	73
	5	132	132	132	140	140	132
	6	165	165	165	170	160	165
	8	260	260	260	286	302	275
	10	436	436	436	485	510	455
	12	667	667	667	749	775	690
	14	940	940	940	890	975	940
	16	1250	1250	1250	1250	1300	1250
	18	1625	1625	1625	1475	1750	1625
	20	2050	2050	2050	1775	2225	2050
	24	2825	2825	2825	2825	3625	3325

2500 lb	½	….	7	….	7	7	8
	¾	….	9	….	8	10	9
	1	….	12	….	12	12	13
	1¼	….	18	….	17	18	20
	1½	….	25	….	24	25	28
	2	….	38	….	37	39	42
	2½	….	55	….	53	56	52
	3	….	83	….	80	86	94
	4	….	127	….	122	133	146
	5	….	210	….	204	223	244
	6	….	323	….	314	345	378
	8	….	485	….	471	533	576
	10	….	925	….	897	1025	1068
	12	….	1300	….	1262	1464	1608

Alloy Steel Grade F91 Flange Pressure Ratings

Temp. °F	Class 75 psi	Class 150 psi	Class 300 psi	Class 400 psi	Class 600 psi	Class 900 psi	Class 1500 psi	Class 2500 psi
-20~100	145	290	750	1000	1500	2250	3750	6250
200	135	260	735	980	1470	2210	3680	6135
300	115	230	700	935	1400	2100	3495	5830
400	100	200	670	890	1335	2005	3345	5570
500	85	170	645	860	1290	1940	3230	5385
600	70	140	605	805	1210	1815	3025	5040
650	60	125	590	785	1175	1765	2940	4905
700	–	110	570	755	1135	1705	2840	4730
750	–	95	530	710	1065	1595	2660	4430
800	–	80	510	675	1015	1525	2540	4230
850	–	65	485	650	975	1460	2435	4060
900	–	50	375	500	745	1120	1870	3115
950	–	35	275	365	550	825	1370	2285
1000	–	20	200	265	400	595	995	1655
1050	–	–	145	190	290	430	720	1200
1100	–	–	95	130	190	290	480	800
1150	–	–	60	80	125	185	310	515
1200	–	–	35	45	70	105	170	285

A182 B16.5 Alloy Steel F91 Flanges Schedule / Class

Flange Schedule/Class	Pipe Size – Pipe Flanges	Flange Connection Type	Flange Material	Max. Pressure
ASME B16.5 Class 150	1/2″	FNPT	Alloy Steel F91 / Cr-Mo F91 / A182 F91 Flange	150 psi
ASME B16.5 Class 150	1/2″	Socket Weld		275 psi
ASME B16.5 Class 150	1/2″	Welded		150 psi
ASME B16.5 Class 150	3/4″	FNPT		150 psi
ASME B16.5 Class 150	3/4″	Socket Weld		275 psi
ASME B16.5 Class 150	1-1/4″	Socket Weld		275 psi
ASME B16.5 Class 150	1-1/2″	Socket Weld		275 psi
ASME B16.5 Class 150	2″	FNPT		150 psi
ASME B16.5 Class 150	2″	Socket Weld		275 psi
ASME B16.5 Class 150	2-1/2″	Socket Weld		275 psi
ASME B16.5 Class 150	3″	Socket Weld		275 psi
ASME B16.5 Class 150	4″	FNPT		150 psi
ASME B16.5 Class 150	4″	Socket Weld		275 psi
ASME B16.5 Class 300	1/2″	Slip On		720 psi
ASME B16.5 Class 300	1/2″	Slip On		720 psi
ASME B16.5 Class 300	1″	Slip On		720 psi
ASME B16.5 Class 300	1″	Slip On		720 psi
ASME B16.5 Class 300	1-1/4″	FNPT		720 psi
ASME B16.5 Class 300	1-1/4″	Slip On		720 psi
ASME B16.5 Class 300	1-1/2″	Slip On		720 psi
ASME B16.5 Class 300	1-1/2″	Slip On		720 psi
ASME B16.5 Class 300	2″	Slip On		720 psi
ASME B16.5 Class 300	2″	Slip On		720 psi
ASME B16.5 Class 300	2-1/2″	Slip On		720 psi
ASME B16.5 Class 300	2-1/2″	Slip On		720 psi
ASME B16.5 Class 300	3″	Slip On		720 psi
ASME B16.5 Class 300	3″	Slip On		720 psi
ASME B16.5 Class 300	4″	Slip On		720 psi
ASME B16.5 Class 300	4″	Slip On		720 psi

Alloy Steel Grade F91 Flanges Standard

American Steel Flanges Standard
Standard Code	Standard Name
ANSI ASME SA-182	Forged Flanges
ANSI ASME B16.5	Slip on flange, Welding neck flange, Blind flange, Threaded flange, Lap joint flange, RTJ flange
ASME – B 16.47	Welding neck flange, Blind flange
ASME – B 16.36	Welding neck flange Slip on flange
German Steel Flanges Standard
DIN 2527	Steel Blind Flanges, BLRF
DIN 2573 / 2576	Flat Flange for Welding (Slip On)
DIN 2673	Loose Flanges and Rings for Welding (Slip On Flanges and Plain Collars)
DIN 2641 / 2642	Lapped / Loose (Lap Joint) Flanges Plain Collars
DIN 28115	Long Neck Welding Flanges
DIN PN10, PN16	Alloy Steel F91 PN10 Flanges, F91 Alloy Steel DIN PN 10 Flanges, A182 F91 Alloy Steel PN16 Flange
DIN PN20, PN25	Alloy Steel F91 PN20 Flanges, F91 Chrome Moly DIN PN 25 Flanges
DIN PN40, PN50	Chrome Moly Steel F91 PN40 Flanges, F91 Alloy Steel DIN PN 50 Flanges
Japanese Steel Flanges Standard
JIS B2220	Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL)
JIS B2291	Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL)
JIS 5K, 10K	Alloy Steel F91 5K SORF Flanges, F91 Alloy Steel 10K SOFF Flanges
JIS 16K, 20K	Alloy Steel F91 16K Blind Flanges, A182 F91 Chromium Molybdenum Steel 20K BLRF Flanges
JIS 30K, 40K	Alloy Steel F91 30K Slip on Flanges, F91 Alloy Steel 40K Blind Flanges
Italian Flanges Standard
UNI FLANGES	Plan flanges (2276, 2277, 2278, 6083, 6084) Welding neck (2280, 2281, 2282, 2283, 2284, 2285, 2286) Lapped flanges (6088, 6089, 6090, 2999, 2300) Blind flanges (6091, 6092, 6093, 6094, 6095, 6096, 6097) threaded flanges (2253, 2254)
British Standard Pipe Flanges Standard
BS 10 Table D	Alloy Steel F91 BS 10 Table D Flanges, F91 Table D Pipe Flange
BS 10 Table E	Alloy Steel F91 BS 10 Table E Flanges, A182 F91 Table E Pipe Flange
BS 10 Table F	Chromium Molybdenum Steel F91 BS 10 Table E Flanges, F91 Cr-Mo Table E Flanges
BS 10 Table H	Alloy Steel F91 BS 10 Table E Flanges, Cr-Mo F91 Table E Pipe Flanges

Best quality Alloy Steel Grade F91 Flanges, MSS SP-44 CrMo F91 Plate Flange, F91 Alloy Steel Forged Flanges Exporter, UNS K90901 Puddle Flanges Chromium Molybdenum Steel F91 Flange, Chrome Moly F91 Forged Flanges Flat Face, Alloy Steel F91 Flanges Dimension, Alloy A182 F91 Weld Neck Flanges, DIN 1.4903 Backup Flange, ASME SA182 AS F91 RTJ Flanges, F91 AS SORF Flange, Alloy Steel F91 Lap Joint Flanges, Werkstoff Nr. 1.4903 SORF Flanges, Chrome Moly F91 Flanges, Grade F91 Alloy Steel Flat Face Flanges, Cr-Mo F91 Spades Ring Spacers Flanges, Wrought Alloy Steel F91 Flanges, ASTM A182 F91 Expander Flanges at Best Price.

Alloy Steel A182 Grade F91 Flanges Applications

We stock in India and export to the following countries

Australia, Afghanistan, Algeria, Angola, Argentina, Armenia, Azerbaijan, Bahrain, Bangladesh, Benin,
Bhutan, Botswana, Brazil, Brunei, Burkina Faso, Cambodia, Cameroon, Canada, Central Africa Republic,
Chad, Chile, Colombia, Cuba, Cyprus, DRC, Djibouti, Egypt, Equatorial Guinea, Eritrea, Eswatini,
Ethiopia, Fiji, Finland, France, Georgia, Germany, Ghana, Greece, Hungary, Iceland, Indonesia, Iran,
Iraq, Ireland, Israel, Italy, Japan, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Laos, Lebanon,
Lesotho, Liberia, Libya, Lithuania, Madagascar, Malawi, Malaysia, Maldives, Mali, Mexico, Morocco,
Mozambique, Mauritania, Myanmar, Namibia, Nepal, Netherlands, New Zealand, Nigeria, Norway, Oman,
Panama, Peru, Philippines, Poland, Portugal, Palestine, Qatar, Russia, Rwanda, Romania, Saudi Arabia,
Senegal, Sierra Leone, Singapore, Slovakia, Somalia, South Africa, South Korea, South Sudan, Spain,
Sri Lanka, Sweden, Switzerland, Syria, Taiwan, Tajikistan, Tanzania, Tasmania, Thailand, The Gambia,
Timor-Leste, Togo, Tunisia, Turkey, Turkiye, Turkmenistan, Uganda, Uzbekistan, United Arab Emirates (UAE),
United Kingdom (UK), United States (US), Venezuela, Vietnam, Yemen, Zambia, Zimbabwe

We stock in Mumbai and supply to the following cities

Abu Dhabi, Amsterdam, Abuja, Accra, Addis Ababa, Ahmedabad, Algiers, Amman, Ankara, Antananarivo,
Ashgabat, Asmara, Astana, Athens, Baghdad, Baku, Bamako, Bandar Seri Begawan, Bangkok, Bangui,
Banjul, Beirut, Bengaluru, Berlin, Bishkek, Bloemfontein, Bogotá, Bern, Brasília, Bratislava,
Bucharest, Budapest, Buenos Aires, Cairo, Canberra, Cape Town, Caracas, Chennai, Coimbatore, Dakar,
Damascus, Dhaka, Dili, Djibouti city, Dodoma, Doha, Dublin, Dushanbe, Freetown, Gaborone, Ghaziabad,
Guwahati, Hanoi, Harare, Havana, Helsinki, Hobart, Hyderabad, Indore, Jaipur, Jakarta, Jerusalem,
Juba, Jurong East, Kabul, Kampala, Kanpur, Kathmandu, Kigali, Kinshasa, Kochi, Kolkata, Kuala Lumpur,
Kuwait City, Lisbon, Lilongwe, Lima, Lobamba, Lomé, London, Luanda, Lucknow, Lusaka, Malabo, Madrid,
Malé, Mexico City, Manama, Moscow, Manila, Maputo, Maseru, Mbabane, Mogadishu, Monrovia, Mumabi,
Muscat, Nagpur, Nairobi, New Delhi, Niamey, Nicosia, Noida, Nouakchott, N’Djamena, Oslo, Ottawa,
Ouagadougou, Panama City, Paris, Patna, Phnom Penh, Porto-Novo, Pretoria, Pune, Rabat, Reykjavík,
Riyadh, Rome, Sana’a, Santiago, Sri Jayawardenepura Kotte, Stockholm, Seoul, Singapore, Surat,
Suva, Taipei City, Tashkent, Tokyo, Tbilisi, Tehran, Thimphu, Tripoli, Tunis, Vientiane, Vilnius,
Visakhapatnam, Warsaw, Washington D.C., Wellington, Windhoek, Yaoundé, Yerevan, Naypyidaw

Alloy Steel F91 Flanges Price

Omaa Metal Sources is ASME B16.5 ASTM A182 Alloy Steel F91 Flanges Exporters and Suppliers in the US, UK, South Africa, Saudi Arabia, Singapore, UAE, Oman, South Korea, Turkey, Bahrain, Malaysia, Philippines, Thailand, Norway, Indonesia, Iraq, Yemen, Bangladesh, Nigeria, Egypt, Peru, Ghana, Morocco, Etc.