ASTM A182 F55 forged fittings are pipe connection components manufactured from a super duplex stainless steel grade designated as F55 under the ASTM A182 standard. This standard specifies the requirements for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves 1 for high-temperature service.

What is the material ASTM A182 F55?

ASTM A182 F55 is a super duplex stainless steel material grade used primarily for high-performance, corrosion-resistant forged components, especially in aggressive environments like offshore, oil & gas, and chemical processing.

ASTM A182 F55 – Overview

Standard: ASTM A182 – Forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service.

Grade: F55 corresponds to Super Duplex Stainless Steel, specifically UNS S32760.

Key Features of F55 / S32760

Property	Description
Type	Super Duplex Stainless Steel
UNS Number	S32760
Cr-Ni-Mo alloy	High chromium, nickel, and molybdenum content
PREN (Pitting Resistance Equivalent Number)	> 40 (very high pitting corrosion resistance)
Ferrite-Austenite Structure	~50% ferrite and 50% austenite — provides strength + corrosion resistance
Corrosion Resistance	Excellent in seawater, chloride-rich, acidic, and sour environments (H₂S)
Mechanical Strength	Higher than standard duplex and austenitic stainless steels
NACE Compliance	Suitable for sour service per NACE MR0175/ISO 15156

What is the ASME standard for forged fittings?

ASME B16.11 – Forged Fittings, Socket-Welding and Threaded

This standard covers:

                                    Socket weld (SW) fittings

                                    Threaded (THD or NPT) fittings

Size : NPS ⅛" to 4"

Pressure Classes : Class 2000, 3000, 6000 (Threaded) and Class 3000, 6000, 9000 (Socket Weld)

Ratings : Pressure-temperature ratings for various classes of forged fittings.

Dimensions : Specifies the dimensions for different types of forged fittings, including elbows, tees, couplings, reducers, caps, unions, and more.

Tolerances : Defines acceptable dimensional tolerances to ensure proper fit-up.

Marking : Requirements for marking fittings with essential information like class, size, material grade, and manufacturer's identification.

Material Requirements : References ASTM standards for the materials used in the manufacturing of forged fittings.

Fitting Types Covered :

Elbows (90°, 45°)	Tees
Crosses	Couplings
Unions	Caps
Bushings	Plugs

ASTM A182 F55 Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	W
ASTM F55	MIN						6.00	24.00	3.00	0.20	0.50	0.5
	MAX	0.03	1.00	0.030	0.010	1.00	8.00	26.00	4.00	0.30	1.00	1

ASTM A182 F55 Mechanical Property

MATERIAL	ASTM A182 F55
T.S (MPA)	750-895
Y.S (MPA)	550min
EL %	25min
R/A %	45min

F55 Equivalent Grades by Standards

Standard	Grade	Notes
UNS	S32760	Unified Numbering System (USA)
EN (Europe)	1.4501	EN 10088 / DIN X2CrNiMoCuWN25-7-4
W.Nr.	1.4501	Werkstoffnummer (Germany)
AFNOR (France)	Z3CND25.06.03	French standard designation
BS (UK)	25Cr Super Duplex	British Standard description
ISO	X2CrNiMoCuWN25-7-4	ISO 15156, suitable for sour service
NORSOK	MDS D55	For oil & gas industry (Norway)
SEW (Germany)	SEW 410	Technical delivery standard

ASTM A182 F55 Heat Treatment

Grade	Heat Treat Type	Austenitizing/Solutioning Temperature, Minimum or Range, °F [°C]A	Cooling Media	Quenching Cool Below °F [°C]	Tempering Temperature,
					Minimum or
					Range, °F [°C]
ASTM A182	solution treat and quench	2010-2085 [1100-1140]	liquid	500 [260]	B
Grade F55

What is ASTM A182 material grade?

Stainless Steel Grades

Grade	UNS Number	Type
F304	S30400	Austenitic Stainless Steel
F304L	S30403	Low-Carbon Austenitic
F316	S31600	Austenitic with Mo
F316L	S31603	Low-Carbon Austenitic
F321	S32100	Stabilized Austenitic
F347	S34700	Niobium-stabilized Austenitic
F44	S31254	High-alloy austenitic (6Mo)

Duplex & Super Duplex Grades

Grade	UNS Number	Notes
F51	S31803	Duplex Stainless Steel
F53	S32750	Super Duplex
F55	S32760	Super Duplex (high PREN)

Forged Fittings Types

Stainless Steel Forged Fittings ASTM A/SA182 in sizes 1/8″ to 4″, shapes & dimensions are conform to standard of ASME B16.11. 
Pressure ratings for threaded fittings are Class 2000#, 3000# and 6000#. 
Pressure ratings for socket weld fittings are Class 3000#, 6000# and 9000#.

Miscellaneous fittings such as pipe nipples, concentric & eccentric swages and branch connection outlets (olets ) are also available.

ASTM A182 F55 Socket Weld Fittings

ASTM A182 F55 socket weld fittings are made of super duplex stainless steel (UNS S32760) and are widely used in high pressure, corrosive environments such as offshore, chemical and marine applications. The socket weld connection provides a strong, leak-proof joint, especially suitable for small diameter, high pressure systems.

Nominal Size		Socket Bore Dia.	Bore Dia. of Fittings			Socket Wall Thickness						Body Wall			Depth of Socket	Laying Lengths	Laying Lengths	End Wall Thickness			Center to Bottom of Socket
DN	NPS	B	D			C						G min			J min	E	F	K min			A		H
			3000	6000	9000	3000		6000		9000		3000	6000	9000	3000	6000	9000	3000	6000	3000	6000
						ave	min	ave	min	ave	min
6	1/8	10.9	6.1	3.2		3.18	3.18	3.96	3.43			2.41	3.15		9.5	6.5	16.0	4.8	6.4
8	1/4	14.3	8.5	5.6		3.78	3.30	4.60	4.01			3.02	3.68		9.5	6.5	16.0	4.8	6.4
10	3/8	17.7	11.8	8.4		4.01	3.50	5.03	4.37			3.20	4.01		9.5	6.5	17.5	4.8	6.4		37		9.5
15	1/2	21.9	15.0	11.0	5.6	4.67	4.09	5.97	5.18	9.53	8.18	3.73	4.78	7.47	9.5	9.5	22.5	6.4	7.9	11.2	41	51	9.5	11
20	3/4	27.3	20.2	14.8	10.3	4.90	4.27	6.96	6.04	9.78	8.56	3.91	5.56	7.82	12.5	9.5	24.0	6.4	7.9	12.7	51	60	11	13
25	1	34.0	25.9	19.9	14.4	5.69	4.98	7.92	6.93	11.38	9.96	4.55	6.35	9.09	12.5	12.5	28.5	9.6	11.2	14.2	60	71	13	16
32	1 1/4	42.8	34.3	28.7	22.0	6.07	5.28	7.92	6.93	12.14	10.62	4.85	6.35	9.70	12.5	12.5	30.0	9.6	11.2	14.2	71	81	16	17
40	1 1/2	48.9	40.1	33.2	27.2	6.35	5.54	8.92	7.80	12.70	11.12	5.08	7.14	10.15	12.5	12.5	32.0	11.2	12.7	15.7	81	98	17	21
50	2	61.2	51.7	42.1	37.4	6.93	6.04	10.92	9.50	13.84	12.12	5.54	8.74	11.07	16.0	19.0	41.0	12.7	15.7	19.0	98	151	21	30
65	2 1/2	73.9	61.2			8.76	7.62					7.01			16.0	19.0	43.0	15.7	19.0		151		30
80	3	89.9	76.4			9.52	8.30					7.62			16.0	19.0	44.5	19.0	22.4		184		57
100	4	115.5	100.7			10.69	9.35					8.56			19.0	19.0	48.0	22.4	28.4		201		66

ASTM A182 F55 Threaded Fittings

ASTM A182 F55 threaded fittings are high-performance components made from super duplex stainless steel (UNS S32760), designed for corrosive and high-pressure environments where welding isn't feasible. These fittings are often used in offshore, chemical processing, marine, and oil & gas installations.

Nominal Size		End-to-End	End-to-End		Outside Diameter		End Wall		Length of Thread
DN	NPS	W	P		D		G min		L 5 m in	L 2 m in
		3000 & 6000	3000	6000	3000	6000	3000	6000
6	1/8	32	19		16	22	4.8		6.4	6.7
8	1/4	35	25		19	25	4.8		8.1	10.2
10	3/8	38	25	27	22	32	4.8	6.4	9.1	10.4
15	1/2	48	32	33	28	38	6.4	7.9	10.9	13.6
20	3/4	51	37	38	35	44	6.4	7.9	12.7	13.9
25	1	60	41	43	44	57	9.7	11.2	14.7	17.3
32	1 1/4	67	44	46	57	64	9.7	11.2	17.0	18.0
40	1 1/2	79	44	48	64	76	11.2	12.7	17.8	18.4
50	2	86	48	51	76	92	12.7	15.7	19.0	19.2
65	2.5	92	60	64	92	108	15.7	19	23.6	28.9
80	3	108	65	68	108	127	19	22.4	25.9	30.5
100	4	121	68	75	140	159	22.4	28.4	27.7	33

What is the difference between casting and forging?

Feature	Casting	Forging
Definition	Molten metal is poured into a mold and solidified into shape	Metal is shaped by mechanical force (hammering, pressing, or rolling) in solid state
Process	Liquid → Mold → Solid part	Solid → Compressed under pressure → Final shape
Grain Structure	Random grain orientation, possible porosity	Refined, aligned grain flow, no porosity
Strength	Generally lower strength	High strength, fatigue & impact resistance
Surface Finish	Can have good surface detail but may need machining	Typically rougher, needs more machining
Complex Shapes	Excellent for complex geometries	Limited to simpler shapes unless post-machined
Defects	Susceptible to shrinkage, porosity, inclusions	Minimal internal defects if properly forged
Common Materials	Steel, iron, aluminum, bronze, etc.	Steel, stainless steel, titanium, alloys
Typical Products	Pump housings, valve bodies, impellers, manifolds	Flanges, fittings, shafts, gears, pressure parts
Cost (low volume)	Lower tooling cost	Higher tooling and equipment cost
Cost (high volume)	Economical for large, complex runs	Economical for durable parts under stress

Use casting when:

Complex shapes are needed

High-volume production

Strength is not the top priority

Examples: pump casings, engine blocks, sculptures

Use forging when:

High strength and fatigue resistance are critical

Pressure-retaining or load-bearing parts

Examples: flanges, connecting rods, crankshafts, aircraft parts

Applications

Oil & Gas (offshore platforms, pipelines)

Petrochemical & chemical plants

Power generation (nuclear, desalination)

Marine systems

High-chloride & corrosive fluid handling

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

ASTM A182 F55 Forged Fittings Exported Countries

We Export ASTM A182 F55 Forged Fittings to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc