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Stainless steel forged fittings are an important type of industrial pipeline fittings, mainly made of stainless steel materials. It have excellent corrosion resistance, high temperature resistance, and mechanical properties. There are various types of stainless steel forged fittings, mainly used for connecting and transmitting fluids or gas media, and widely used in multiple industries such as petroleum, chemical, power, pharmaceuticals, and food.

According to the Connection Method: Socket Weld Fittings and Threaded Fittings

Stainless steel forged pipe fittings require multiple processes, including material selection, forging, heat treatment, mechanical processing, and inspection. These fittings typically have high dimensional accuracy and surface quality, with a wide variety of fittings that can meet strict engineering requirements and usage environments.

Socket weld fittings include: socket elbow, socket tee, socket cross, socket coupling, socket cap, socket boss,socket union;

Size range: 1/8 inch -4 inche;

Pressure range: Class 3000 6000 9000

Threded fittings include: threaded 45 degree elbow, threaded 90 degree elbow, threaded tee, threaded cross, male and female threaded 90 degree elbow, threaded coupling, threaded boss, threaded cap, threaded plug, threaded bushing, threaded union, etc.

Size range: 1/8 inch -4 inch;

Pressure range: Class 2000 3000 6000

ASME B16.11 Types and Dimension of Stainless Steel Forged Fittings

The production standards for stainless steel forged fittings include ASME B16.11; MSS SP-83; MSS SP-97; MSS SP-95, etc. Among them, ASME B16.11 production standard is the most widely used. The ASME B16.11 standard is a production standard for forged high-pressure fittings published by the American Standards Institute. Specifically, the ASME B16.11 standard has detailed requirements for the material, size, shape, pressure rating, tolerance range, and other aspects of high-pressure forged fittings.

Types of Stainless Steel Socket Weld Fittings

Dimension

Nominal Size		Socket Bore Dia	Bore Dia.of Fitings			Socket Wall Thickness						Body Wal			Depth of Socket	Center to Bottom of Socket
DN	NPS	B	D			C						Gmin			J mim	A
			3000	6000	9000	3000		6000		9000		3000	6000	9000		90°Elbow Tee Cross			45°Elbow
						ave	min	ave	min	ave	min					3000	6000	9000	3000	6000	9000
6	1/8	10.9	6.1	3.2		3.18	3.18	3.96	3.43			2.41	3.15		9.5	11.0	11.0		8	8
8	1/4	14.3	8.5	5.6		3.78	3.30	4.60	4.01			3.02	3.68		9.5	11.0	13.5		8	8
10	3/8	17.7	11.8	8.4		4.01	3.50	5.03	4.37			3.20	4.01		9.5	13.5	15.5		8.0	11.0
15	1/2	21.9	15.0	11	5.6	4.67	4.09	5.97	5.18	9.53	8.18	3.73	4.78	7.47	9.5	15.5	19.0	25.5	11	12.5	15.5
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	19.0	22.5	28.5	13	14	19
25	1	34	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	22.5	27.0	32.0	14.0	17.5	20.5
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	27.0	32.0	35.0	17.5	20.5	22.5
40	1-1/2	48.9	40.1	33.2	27.2	6.35	5.54	8.92	7.8	12.70	11.12	5.08	7.14	10.15	12.5	32.0	38.0	38.0	20.5	25.5	25.5
50	2	61.2	51.7	42.1	37.4	6.93	6.04	10.92	9.5	13.84	12.12	5.54	8.74	11.07	16.0	38.0	41.0	54.0	25.5	28.5	28.5
65	2-1/2	73.9	61.2			8.76	7.62					7.01			16.0	41.0			28.5
80	3	89.9	76.4			9.52	8.30					7.62			16.0	57.0			32.0
100	4	115.5	100.7			10.69	9.35					8.56			19.0	66.5			41.0

Types of Stainless Steel Socket Weld Fittings

Dimension

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						n			min	E	F	Kmin			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	3.3	4.6	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	3.5	5.03	4.37			3.2	4.01		9.5	6.5	17.5	4.8	6.4		37		9.5
15	1/2	21.9	15	11	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	4.9	4.27	6.96	6.04	9.78	8.56	3.91	5.56	7.82	12.5	9.5	24	6.4	7.9	12.7	51	60	11	13
25	1	34	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	42.1	22	6.07	5.28	7.92	6.93	12.14	10.62	4.85	6.35	9.7	12.5	12.5	30	9.6	11.2	14.2	71	81	16	17
40	1-1/2	48.9	40.1		27.2	6.35	5.54	8.92	7.8	12.7	11.12	5.08	7.14	10.15	12.5	12.5	32	112	12.7	15.7	81	98	17	21
50	2	61.2	51.7		37.4	6.93	6.04	10.92	9.5	13.84	12.12	5.54	8.74	11.07	16	19	41	12.7	15.7	19	98	151	21	30
65	2-1/2	73.9	61.2			8.76	7.62					7.01			16	19	43	15.7	19		151		30
80	3	89.9	76.4			9.52	8.3					7.62			16	19	44.5	19	22.4		184		57
100	4	115.5	100.7			10.69	9.35					8.56			19	19	48	22.4	28.4		201		66

Tolerance

TOLERANCES FOR SW FITTINGS
Nominal Size		Aa Fttings		Ebows，    Tees， Crosses	Couping	Half- Couplings	Reducer Inserts			Unions
		Socket Bore Dia	Bore Dia.of Fittings	Center to Bottom of   Socket	Laying Lengths	Laying Lengths	Laying Length	Shank Dia	Length	Laying Length
DN	NPS	B	D	A,H	E	F	A	SD	SL	E
6-8	1/8-1-1/4	+0.4 0	+1.5 0	±1.0	±1.5	±1.0	+1.5 0	±0.25	0 -1.5	±1.5
10-20	3/8-3/4	+0.4 0	+1.5 0	±1.5	±3.0	±1.5	+1.5 0	±0.25	0 -1.5	±3.0
25-40	1-1-1/2	+0.4 0	+1.5 0	±2.0	±4.0	±2.0	+2.0 0	±0.25	0 2.0	±4.0
50	2	+0.5 0	+1.5 0	±2.0	±4.0	±2.0	+2.0 0	±0.5	0 2.0	±4.0
65-80	2-1/2-3	+0.5 0	+3.0 0	±2.5	±5.0	±2.5	+2.5 0	+0.5	0 2.5	±5.0
100	4	+0.5 0	+3.0 0	±2.5	±5.0	±2.5	+2.5 0	±0.7	0 -2.5

Tyeps of Threaded Forged Fittings

Dimension

Nominal Size		Center-to-End						Outside Diameter of Band			Wall Thickness			Length of Thread
DN	NPS	A						H			G min			min	mim
		90 Ebows Tees Crosses			45 Elbows
		2000	3000	6000	2000	3000	6000	2000	3000	6000	2000	3000	6000
6 8 10	1/8 1/4 3/8	21 21 25	21 25 28	25 28 33	17 17 19	17 19 22	19 22 25	22 22 25	22 25 33	25 33 38	3.18 3.18 3.18	3.18 3.30 3.51	6.35 6.60 6.98	6.4 8.1 9.1	6.7 10.2 10.4
15 20 25	1/2 3/4 1	28 33 38	33 38 44	38 44 51	22 25 28	25 28 33	28 33 35	33 38 46	38 46 56	46 56 62	3.18 3.18 3.68	4.09 4.32 4.98	8.15 8.53 9.93	10.9 12.7 14.7	13.6 13.9 17.3
32 40 50	1-1/4 1-1/2 2	44 51 60	51 60 64	60 64 83	33 35 43	35 43 44	43 44 52	56 62 75	62 75 84	84 102	3.89 4.01 4.27	5.28 5.56 7.14	10.59 11.07 12.09	17.0 17.8 19.0	18.0 18.4 19.2
65 80 100	2-1/2 3 4	76 86 106	83 95 114	95 106 114	52 64 79	52 64 79	64 79 79	92 109 146	102 121 152	121 146 152	5.61 5.99 6.55	7.65 8.84 11.18	15.29 16.64 18.67	23.6 25.9 27.7	28.9 30.5 33.0

Tyeps of Threaded Forged Fittings

Dimension

Nominal Size		End-to-End	End-to-End		Outside Diameter		End Wall		Length of Thread
DN	NPS	W	P		D		G min		L5 min	L2 min
		3000&6000	3000	6000	3000	6000	3000	6000
6 8 10	1/8 1/4 3/8	32 35 38	19 25 25	27 27	16 19 22	22 25 32	4.8 4.8 4.8	/  6.4 6.4	6.4 8.1 9.1	6.7 10.2 10.4
15 20 25	1/2 3/4 1	48 51 60	32 37 41	33 38 43	28 35 44	38 44 57	6.4 6.4 9.7	7.9 7.9 11.2	10.9 12.7 14.7	13.6 13.9 17.3
32 40 50	1-1/4 1-1/2 2	67 79 86	44 44 48	46 48 51	57 64 76	64 76 92	9.7 11.2 12.7	11.2 12.7 15.7	17.0 17.8 19.0	18.0 18.4 19.2
65 80 100	2-1/2 3 4	92 108 121	60 65 68	64 68 75	92 108 140	108 127 159	15.7 19.0 22.4	19.0 22.4 28.4	23.6 25.9 27.7	28.9 30.5 33.0

Tyeps of Threaded Forged Fittings

Dimension

Nominal Size		Leng	Square Height	Width Flats	Head Diameter	Length	Hex Height	Hex Height	Hex Width Flats
DN	NPS	A min	B min	C min	E nom	D mim	H min	G min	F nom
6 8 10	1/8 1/4 3/8	10 11 13	6 6 8	7 10 11	10 14 18	35 41 41	6 6 8	/  3 4	11 16 18
15 20 25	1/2 3/4  1	14 16 19	10 11 13	14 16 21	21 27 33	44 44 51	8 10 10	5 6 6	22 27 36
32 40 50	1-1/4 1-1/2 2	21 21 22	14 16 18	24 28 32	43 48 60	51 51 64	14 16 18	7 8 9	46 50 65
65 80 100	2-1/2 3 4	27 28 32	19 21 25	36 41 65	73 89 114	70 70 76	19 21 25	10 10 13	75 90 115

Tolerance

TOLERANCES FOR THRD FITTINGS
Nominal Size		Ebows Tees Crosses	Couplings	Half couplings
		Center-to-End	End-to-End	End-to-End
D N	NPS	A、J	W	W/2
6-8	1/8-1/4	±1.0	±1.0	±1.0
10-20	3/8-3/4	±1.5	±1.5	±1.5
25-50	1-2	±2.0	±2.0	±2.0
65-100	2-1/2-4	±2.5	±2.5	±2.5

Class of The Stainless Steel Forged Fittings VS Grade of the Connecting Pipes

Joint Type	Class	Grade of Conneding Pipes	Joint Type	Class	Grade of Connecting Pipes
SW	3000	Sch80、XS	THRD	2000	Sch80、XS
	6000	Sch160		3000	Sch160
	9000	XXS		6000	XXS

Shape

Stainless Steel Elbow – Socket Weld and Screwed Type. ASME B16.11 & BS3799.

Stainless Steel Threaded Plug and Bushing.

Stainless Steel Nipple – Screw, Swage and Hexagonal Nipple.

Stainless Steel Cap – BSP & NPT Threaded Cap and Socket Weld Cap.

Union – 316 & 304 Stainless Steel Union in BSP, NPT and SW Type.

Stainless Steel Tee – Equal and Reducing Type in Socket Weld and Threaded. ASME B16.11 & BS3799 Standard.

Stainless Steel Pipe Coupling – Socket Weld and Threaded Full & Half Coupling. Available in Class 2000, 3000, 6000 and 9000.

Material Types of Stainless Steel Forged Fittings

Stainless steel forged fittings are high-quality and high-performance pipeline connectors widely used in pipeline systems that need to withstand high temperatures and pressures in industries such as oil, natural gas, chemical, and power. The American standard material standard for stainless steel forged fittings corresponds to ASTM A182, and common material types include stainless steel F304/316; Duplex stainless steel F51/F53, etc.

Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
ASTM A182 F304	MIN						8.0	18.0
	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0		0.10
ASTM A182 F316	MIN						10.0	16.0	2.00
	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00	0.01
ASTM A182 F51	MIN						4.50	21.00	2.50	0.08
	MAX	0.03	2.00	0.030	0.020	1.00	6.50	23.00	3.50	0.20
ASTM A182 F53	MIN						6.00	24.00	3.00	0.24
	MAX	0.03	1.20	0.035	0.020	0.80	8.00	26.00	5.00	0.32	0.5

Mechanical Properties

MATERIAL	ASTM A182 F304	ASTM A182 F316	ASTM A182 F51	ASTM A182 F53
T.S (MPA)	515 min	515 min	620 min	800 min
Y.S (MPA)	205 min	205 min	450 min	550 min
EL %	30 min	30 min	35 min	25 min
R/A %	50 min	50 min	45 min	15 min
HARDNESS				310 max

Characteristics of Stainless Steel Fittings

Steel pipe fittings are basically used for piping and tubing systems to connect and change direction of the flow that conveys liquid, gas, and occasionally solid materials. Stainless steel pipes & fittings are strong and durable metal which is manufactured as an alloy of chromium and steel. There are various characteristics as following:

· Corrosion resistant

· Highly durable

· Lightweight

· Low maintenance

· Long service life

As a high-quality and high-performance pipe fitting, stainless steel forged fittings have a wide range of application prospects. When selecting and using forged fittings, attention should be paid to their quality and performance to ensure the safety, stability, and efficiency of fluid transportation, providing reliable guarantees for fluid transportation systems in various industries.

5 6 月, 2024