Alloy Steel Slip On Flanges Supplier

Alloy Steel Slip On Flanges Manufacturer and Supplier in India

A slip on flange does what its name says. The pipe slides into the bore, gets positioned, and is fixed with two fillet welds, one outside at the hub and one inside at the face. Alloy steel slip-on flanges do the same job on lines that run hot, using chrome moly forgings made to ASTM A182 in grades F1, F5, F9, F11, F22 and F91. You will also see them called SORF flanges, short for slip on raised face.

Purchasers select them for the price and because they are easy to fit because the end of the pipe does not require a bevel and the length isn’t precise. They suit moderate pressure and temperature lines. For severe thermal cycling or high pressure steam, look at our alloy steel weld neck flanges instead. Solitaire Overseassupplies alloy steel slip-on flanges in ASME B16.5 Class 150 to 600 with raised face, flat face and ring type joint facings, and every order carries a mill test certificate to EN 10204 3.1.

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Technical Data

Specification Chemical Composition Mechanical Properties Size

Specification of Alloy Steel Slip On Flanges

Size	1/2 inch (15 NB) to 24 inch (600 NB). Larger sizes to your drawing.
Standards	ASME B16.5, MSS SP 44, custom drawings
Pressure Ratings	Class 150, 300 and 600 under ASME B16.5. Higher classes and PN ratings to your drawing.
Alloy Steel Slip On Flanges/ SORF Flanges	ASTM A182 F1, F5, F9, F11, F22, F91
Special Alloy Slip On Flanges/ SORF Flanges	Duplex, Super Duplex, Nickel Alloys
Flange Face Type	Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Coating/Surface Treatment	Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Chemical Composition of ASTM A182 Alloy Steel Flanges

Grade	Carbon	Manganese	Silicon	Chromium	Molybdenum	Phosphorus Max	Sulphur Max
F1	0.28 Max	0.60 to 0.90	0.15 to 0.35	Not specified	0.44 to 0.65	0.045	0.045
F5	0.15 Max	0.30 to 0.60	0.50 Max	4.0 to 6.0	0.44 to 0.65	0.030	0.030
F9	0.15 Max	0.30 to 0.60	0.50 to 1.00	8.0 to 10.0	0.90 to 1.10	0.030	0.030
F11 Class 1	0.05 to 0.15	0.30 to 0.60	0.50 to 1.00	1.00 to 1.50	0.44 to 0.65	0.030	0.030
F22 Class 1	0.05 to 0.15	0.30 to 0.60	0.50 Max	2.00 to 2.50	0.87 to 1.13	0.040	0.040
F91	0.08 to 0.12	0.30 to 0.60	0.20 to 0.50	8.0 to 9.5	0.85 to 1.05	0.020	0.010

Mechanical Properties of Slip On Flanges

Grade	Tensile Strength MPa Min	Yield Strength MPa Min	Elongation Percent Min	Hardbness (HBW)
F1	485	275	20
F5	485	275	20	143- 217
F9	585	380	20	179 -217
F11 Class 1	415	205	20
F11 Class 2	485	275	20
F11 Class 3	515	310	20
F22 Class 1	415	205	20	170 max
F22 Class 3	515	310	20	156- 207
F91	620	415	20	190 - 248

Size of Alloy Steel Slip-On Flanges

Nominal Size	Outside Diameter (OD)	Min. Thickness (T)	RF Dia. (R)	No. of Bolt Holes	Diameter of Holes	Bolt Circle (BC)	SO Bore ID (SB)	WN Bore ID (WB)	Dia. Hub Base (HB)	Dia. of Hub Top (HT)	SO LTH (SL)	WN LTH (WL)
1&frasl	2	3.50	0.38	1.38	4	0.62	2.38	0.88	0.62	1.19	0.84	0.56	1.81
3&frasl	4	3.88	0.44	1.69	4	0.62	2.75	1.09	0.82	1.50	1.05	0.56	2.00
1	4.25	0.50	2.00	4	0.62	3.12	1.36	1.05	1.94	1.32	0.62	2.12
11&frasl	4	4.62	0.56	2.50	4	0.62	3.50	1.70	1.38	2.31	1.66	0.75	2.19
11&frasl	2	5.00	0.62	2.88	4	0.62	3.88	1.95	1.61	2.56	1.90	0.81	2.38
2	6.00	0.69	3.62	4	0.75	4.75	2.44	2.07	3.06	2.38	0.94	2.44
21&frasl	2	7.00	0.81	4.12	4	0.75	5.50	2.94	2.47	3.56	2.88	1.06	2.69
3	7.50	0.88	5.00	4	0.75	6.00	3.57	3.07	4.25	3.50	1.12	2.69
31&frasl	2	8.50	0.88	5.50	8	0.75	7.00	4.07	3.55	4.81	4.00	1.19	2.75
4	9.00	0.88	6.19	8	0.75	7.50	4.57	4.03	5.31	4.50	1.25	2.94
5	10.00	0.88	7.31	8	0.88	8.50	5.66	5.05	6.44	5.56	1.38	3.44
6	11.00	0.94	8.50	8	0.88	9.50	6.72	6.07	7.56	6.63	1.50	3.44
8	13.50	1.06	10.62	8	0.88	11.75	8.72	7.98	9.69	8.63	1.69	3.94
10	16.00	1.12	12.75	12	1.00	14.25	10.88	10.02	12.00	10.75	1.88	3.94
12	19.00	1.19	15.00	12	1.00	17.00	12.88	12.00	14.38	12.75	2.12	4.44
14	21.00	1.31	16.25	12	1.12	18.75	14.14	13.25	15.75	14.00	2.19	4.94
16	23.50	1.38	18.50	16	1.12	21.25	16.16	15.25	18.00	16.00	2.44	4.94
18	25.00	1.50	21.00	16	1.25	22.75	18.18	17.25	19.88	18.00	2.62	5.44
20	27.50	1.62	23.00	20	1.25	25.00	20.20	19.25	22.00	20.00	2.81	5.62
22	29.50	1.75	25.25	20	1.38	27.25	22.22	21.25	24.25	22.00	3.07	5.82
24	32.00	1.81	27.25	20	1.38	29.50	24.25	23.25	26.12	24.00	3.19	5.94

Industrial Applications of Alloy Steel Slip On Flanges

Alloy steel slip-on flanges are used in selected piping arrangements where the mechanical and temperature requirements of the system are compatible with their design.

Their chromium molybdenum material composition makes them relevant to a number of industrial applications.

Refineries: Used in suitable auxiliary and process piping systems handling elevated temperature fluids and refinery streams.
Petrochemical Plants: Applied in selected process lines where material compatibility and operating conditions require alloy steel components.
Power Generation: Used in suitable utility and auxiliary piping systems. The flange type must be approved for the specific steam pressure, temperature and loading conditions.
Fertiliser Plants: Used in selected process and utility services where the piping material specification calls for chromium molybdenum steel.
Industrial Processing: Applied in process piping systems where the required material grade and flange configuration are established by the engineering design.

The final choice of flange type should always follow the project piping specification. Applications involving severe thermal cycling, high pressure or demanding mechanical loads may require a different flange design.

Frequently Asked Questions

What are Alloy Steel Slip On Flanges?

Alloy Steel Slip On Flanges are forged chromium molybdenum flanges that slide over pipes and are secured using internal and external fillet welds, as per ASTM A182.

What is the difference between a slip on and a weld neck flange?

Slip on flanges use two fillet welds, while weld neck flanges use butt weld connections and are preferred for demanding pressure, temperature and cyclic conditions.

Which ASTM A182 grade should I choose, F11, F22 or F91?

F11 suits elevated temperature piping, F22 serves demanding steam and refinery applications, while F91 is used in high temperature power generation systems.

Which standards cover alloy steel slip on flanges?

ASTM A182 specifies material requirements, while ASME B16.5 covers applicable flange dimensions, pressure temperature ratings and related requirements.

What pressure classes are available for alloy steel slip on flanges?

ASME B16.5 covers pressure classes 150, 300, 400, 600, 900, 1500 and applicable Class 2500 configurations, depending on size and flange type.

Can slip on flanges be used in high temperature alloy steel piping?

Yes, where permitted by the piping specification. Chromium molybdenum welding requires appropriate preheating, interpass temperature control and post weld heat treatment.

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Alloy Steel Slip On Flanges (ASTM A182) Supplier and Exporter