Stainless Steel 321/321H Forged Fittings Manufacturer & Supplier

Midland Alloys is a leading 321/321H forged fittings supplier in India, providing high-quality stainless steel products worldwide. Titanium-stabilized austenitic alloys are used to make our SS 321H high-pressure fittings, which are resistant to intergranular attack and corrosion at high temperatures. These forged fittings are manufactured with advanced machinery to ensure tight tolerances, high strength, and dimensional accuracy. Stainless steel 321 forged fittings are created by forging stainless steel bars under extreme pressure making them tough and reliable for industrial use. Every fitting meet ASTM A182 and ASME SA182 standards. We supply globally and offer both socket weld SS 321H fittings and threaded forged 321H fittings in a wide range of forms, including elbows, tees, unions, couplings, bushings, plugs, pipe nipples, and street elbows, available in sizes from 1/8” NB to 4” NB, with custom options too. We also provide seamless/welded 321 stainless fittings customized to project requirements.

Benefits of ASTM A182 F321 Forged Fittings

The advantages of stainless steel 321 forged fittings ensure reliable performance and durability.

Maintain performance under thermal cycling and high pressure.
Withstand harsh chemical exposure.
Excellent toughness even in cryogenic environments.
Low maintenance and long service life.
Tight sealing ensures leak-free connections.
Compatible with automatic welding and assembly systems.
Reliable under vibration and mechanical stress.

Difference Between 304 vs. 321 Forged Fittings

While both SS 304 forged fittings and stainless steel 321 forged fittings have excellent corrosion resistance, 321 is titanium-stabilized, making it better suited for high-temperature applications. SS 321 fittings retain strength and resist intergranular corrosion up to 870°C, as ss 304 which fail after prolonged heat exposure. SS 321 also has better thermal fatigue resistance, making it the best choice for piping under thermal cycling conditions involving steam, heat, or exhaust.

Specification of Stainless Steel 321/321H Forged Fittings

Types of Stainless Steel 321/321H Forged Fittings

Manufacturing Types

Threaded Forged Fittings

Designed with internal or external threads, these fittings allow quick assembly and disassembly without welding.
Socket Weld Forged Fittings

These fittings are joined by inserting the pipe into a recessed area of the fitting and welding around it, ensuring strong, leak-proof joints.
Screwed Fittings

Similar to threaded types, screwed fittings are connected using screw threads, making installation simple and cost-effective.
BSPT

Bushings help reduce the bore size in a fitting or valve connection by joining pipes of varying diameters.
NPT

End caps are used to seal a pipeline's end, shielding it from impurities and guaranteeing closed systems' safety.

Forms

Forged Elbow

Elbows, which come in 45° and 90° varieties shift the direction of flow with little pressure loss.
Forged Bushing

Bushings help reduce the bore size in a fitting or valve connection by joining pipes of varying diameters.
Forged Tee

Used to split or combine flow across three directions essential for branching pipeline.
Forged Coupling

Offer a safe connection between two pipes; threaded and socket-welded options are available.
Forged Plug

Close open pipe ends which are frequently used for isolation or testing.
Forged Cross

With four openings, cross fittings help connect four pipes used when fluid distribution needs to occur in multiple directions.

Contact Midland Alloys Inc. for Your SS 321/321H Forged Fittings Needs

Contact us today to discuss how Stainless Steel 321/321H Forged Fittings can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.

Technical Details & Delivery Condition

Chemical Composition of Stainless Steel 321/321H Forged fitting

Grade	C	Mn	Si	P	S	Cr	N	Ni	Ti
SS 321	0.08 max	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	5(C+N) – 0.70 max
SS 321H	0.04 – 0.10	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	4(C+N) – 0.70 max

Mechanical Properties of Stainless Steel 321/321H Forged fitting

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1400 °C (2550 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

Stainless Steel 321/321H Forged Fittings Equivalent Grade

STANDARD	WERKSTOFF NR.	UNS	JIS	EN
SS 321	1.4541	S32100	SUS 321	X6CrNiTi18-10
SS 321H	1.4878	S32109	SUS 321H	X12CrNiTi18-9

Stainless Steel Forged Fittings Grades We Offer

Stainless Steel 304/304L Forged Fittings

Stainless Steel 310/310S Forged Fittings

Stainless Steel 316/316L Forged Fittings

Stainless Steel 316Ti Forged Fittings

Stainless Steel 317/317L Forged Fittings

Stainless Steel 321/321H Forged Fittings

Stainless Steel 347/347H Forged Fittings

Stainless Steel 904L Forged Fittings

Stainless Steel 253MA Forged Fittings

SMO 254 Forged Fittings

Socket Weld Fittings Dimensions

Threaded Fittings Dimensions

Tolerance Chart

Socket Weld Fittings Dimensions

Threaded Fittings Dimensions

Tolerance Chart

Manufacturing Standards of Stainless Steel 321/321H Forged Fittings

Raw Material

Cutting

Sizing

Heat Treatment

Pickling

Beveling

Polishing

Sand Blasting

Pickling / Passivating

Inspection

Analytic

Marking

Packing & Shipping

Applications of ANSI B16.9/16.28 321H Forged Fittings

SS 321/321H forged fittings India are widely used in oil refineries in pipe joints that handle superheated fluids and gases. Pressure vessels use seamless/welded 321 stainless fittings to ensure structural integrity under high stress. In industrial boilers SS 321H high-pressure fittings connect piping systems that face elevated temperatures every day. The pharmaceutical, and chemical sectors use them in reactors and production pipelines. These fittings are also essential in chemical process heat exchangers and petrochemical refineries for their ability to perform consistently in aggressive environments.

Offshore Industry

Nuclear Industries

Refineries

Ship Building

Aerospace

Pharmaceutical

Why Choose Midland Alloys Inc. for MSS SP‑95/SP‑83 321 Forged Fittings

Midland Alloys Inc. is a trusted manufacturer of SS 321H forged fittings India with a focus on quality, compliance, and customer satisfaction. Our facilities are ISO 9001:2015 certified, and our products include PED 2014/68/EU and EN 10204 3.1/3.2 Mill Test Certificates. We support third-party inspections by TÜV, BV, SGS, and DNV. We collaborate with EPC contractors, engineering firms, maritime, and chemical industries. Our team ensures timely delivery, responsive support, and comprehensive export documentation. Tubes undergo in-house and third-party testing, including hydrostatic, ultrasonic (UT), radiographic (RT), and PMI tests. We also perform tensile, hardness, bend, and flattening tests as needed for the project. As a SS 321H forged fittings supplier India, we supply to client across Middle East, Europe, and Southeast Asia. Our SS 321H forged fittings price per kg depends on types, size, finish and other specifications.

FAQs – SS 321/321H Forged Fittings

What is the difference between 321 and 321H stainless steel forged fittings?

321H has a higher carbon content than 321, which improves its strength at high temperatures.

Can Stainless Steel 321/321H fittings be welded?

Yes. These fittings provide good weldability and are compatible with standard welding methods.

Products Categories

ISO Certificate

Nominal Size		Socket Bore Dia	Bore Dia of Fittings			Socket Wall Thickness						Body Wall			Depth of Socket	Center to Bottom of Socket
D N	NPS	B	D			C						Gmin			J min	A
			3000	6000	9000	3000		6000		9000		3000	6000	9000		90° Elbow Tee Cross			45° Elbow
			3000	6000	9000	ave	min	ave	min	ave	min	3000	6000	9000		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

Nominal Size		Center-to-End						Outside Diameter of Band			Wall Thickness			Length of Thread
DN	NPS	A						H			G min			min	mim
		90° Elbows, Tees, Crosses			45° Elbows			H			G min
		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

Minimal Diam.		Outer Dia. For Bevel End	Inner Dia. For End	Elbow		Tee		Reducer	Cap	180° Elbow
DN	NPS			A	B	C	M	H	E	O	K	Roughness
500-600	20-24	+6.4/-4.8	4.8	3.2	3.2	3.2	3.2	4.8	9.6	–	–	–
650-750	26-30
				4.8	4.8	4.8	4.8
800-1200	32-48
1250-1500	50-60	+9.6/-6.4	6.4	9.6	9.6	9.6	9.6	9.6	–
1550-1750	62-70	+12.7/-9.6	9.6	12.7	12.7	–
1800-2000	72-80	+16/-12	12	16	16
15-65	1/2-2 1/2	+1.6/-0.8	0.8	1.6	1.6	1.6	1.6	1.6	3.2	6.4	6.4	0.8
80-100	3-4	1.6	1.6						6.4
125-200	5-8	+2.4/-1.6
250-450	10-18	+4/-3.2	3.2	2.4	2.4	2.4	2.4	2.4		9.6