Stainless Steel Flanges Manufacturers In India

Stainless Steel Flanges Manufacturer, Supplier and Exporter In India

Solitaire Overseas is a premier manufacturer, supplier, and exporter of high-quality stainless steel flanges in India. Simplified as SS flanges, these components are vital for creating robust and reliable connections within various piping systems and equipment. Due to their superior corrosion resistance, strength, and aesthetically pleasing finish, stainless steel flanges are widely preferred over carbon steel flanges across industries such as oil & gas, petrochemicals, power generation, shipbuilding, construction, and chemical processing.

We specialise in producing stainless steel flanges of diverse shapes, sizes, and specifications to meet the distinct requirements of our customers. Our product range includes Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, and Ring-Type Joint (RTJ) Flanges. Each flange is manufactured with precision, ensuring long service life and reliable performance. For the most popular options, check out our full range of matching Stainless Steel 316 Flanges and Stainless Steel 304 Flanges. Each flange is manufactured with precision, ensuring long service life and reliable performance.

Our stainless steel flanges are renowned globally for their reliability and quality, catering to a vast customer base. Backed by exports to multiple countries, international approvals, and a strong distributor network, we are recognised as one of the trusted stainless steel flange suppliers worldwide. Our state-of-the-art manufacturing facility is equipped to produce flanges in a size range from ½” to 40”.

We ensure that every product adheres to stringent quality standards (ASME/ANSI, EN, DIN, JIS, custom, etc.), including common material grades like ASTM A182 Grade F304/L and F316/L, with pressure ratings from Class 150 to Class 2500. These certifications and global standards compliance make our flanges suitable for critical applications in refineries, offshore platforms, power plants, and process industries.

Our commitment to quality is backed by a stringent quality system and a wide range of certifications and approvals, enabling us to supply our flanges to major end-users across a diverse list of industries worldwide. With a balance of superior quality and competitive stainless steel flange prices, Solitaire Overseas continues to be the go-to choice for industries seeking reliable piping solutions.

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What are Stainless Steel Flanges (SS Flanges)?

Stainless steel flanges, often abbreviated as SS flanges, are a critical component in modern piping systems. They are primarily used to connect pipes, valves, pumps, and other equipment, creating a strong, reliable, and leak-proof joint that ensures the smooth flow of liquids, gases, or steam. Unlike carbon steel flanges, stainless steel flanges provide superior corrosion resistance, high strength, and durability, making them the preferred choice in industries such as oil & gas, petrochemical, power generation, shipbuilding, and chemical processing, where harsh environments demand long service life.

The excellent properties of stainless steel flanges are derived from their unique metallurgical composition. With a minimum of 10.5% chromium, stainless steel develops a natural passive oxide layer on the surface, which resists rusting and staining. The addition of alloying elements like nickel and molybdenum further improves their resistance to aggressive corrosive media, including chlorides, seawater, and acids. This combination of strength, durability, and corrosion resistance ensures that stainless steel flanges not only withstand extreme conditions but also reduce maintenance costs over time.

Stainless Steel Flanges (SS Flanges) Specifications

Material Standard	ASTM A182 / ASME SA182
Size Range	NPS: 1/2" to 40 \| NB: 15 NB to 1000 NB
Grades	F: 304, 304L, 304H, 304N, 304LN, 316, 316L, 316H, 316Ti, 316N, 316LN, 310, 317, 317L, 321, 321H, 347, 347H, 904L Duplex/Super Duplex: F-51, 53, 55, 60, 68
Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, EN-1092, DIN, BS4504, BS 10, ASTM, ASME
Types	SO, WN, SW, BL, THRD, Lap Joint, Orifice Type, Reducing Flanges, Spectacle Blind
Class / Pressure Rating	ANSI/ASME: 150#, 300#, 400#, 600#, 900#, 1500#, 2500# DIN/EN: PN6, PN10, PN16, PN25, PN40, PN63, PN100

Stainless Steel Flanges Chemical Composition

Type	C	Mn	P	S	Si	Cr	Ni	Mb
302	0.15	2.00	0.045	0.030	1.00	17.00/19.00	8.00/10.00	–
304	0.08	2.00	0.045	0.030	1.00	18.00/20.00	8.00/10.50	–
304L	0.03	2.00	0.045	0.030	1.00	18.00/20.00	8.00/12.00	–
309	0.20	2.00	0.045	0.030	1.00	22.00/24.00	12.00/15.00	–
309S	0.08	2.00	0.045	–	1.00	22.00/24.00	–	–
310	0.25	2.00	0.045	0.030	1.5	24.00/26.00	19.00/22.00	–
310S	0.08	2.00	0.045	0.030	1.5	24.00/26.00	19.00/22.00	–
316	0.08	2.00	0.045	0.030	1.00	16.00/18.00	10.00/14.00	2.00/3.00
316L	0.03	2.00	0.045	0.030	1.00	16.00/18.00	10.00/14.00	2.00/3.00
317	0.08	2.00	0.045	0.030	1.00/1.00	18.00/20.00	11.00/15.00	3.00/4.00
317L	0.03	2.00	0.045	0.030	0.75	18.00/20.00	11.00/15.00	3.00/4.00
321	0.08	2.00	0.040	0.030	1.00	17.00/19.00	9.00/12.00	0.75/0.75
347	0.08	2.00	0.040	0.030	0.5/1.00	17.00/19.00	9.00/12.00	0.5/0.75

Stainless Steel Pipe Flanges Mechanical Properties

Type	UNS	Tensile (ksi) min	Yield (ksi) min	Elongation min	Hardness (Brinell) max	Hardness (Rockwell B) max
302	S30200	75	30	40% in 2″	183	88
304	S30400	75	30	40% in 2″	183	88
304L	S30403	70	30	40% in 2″	183	88
309	S30900	75	30	40% in 2″	217	95
309S	S30908	75	30	40% in 2″	217	95
310	S31000	75	30	40% in 2″	217	95
310S	S31008	75	30	40% in 2″	217	95
316	S31600	75	30	40% in 2″	217	95
316L	S31603	70	25	35% in 2″	217	95
317	S31700	75	30	35% in 2″	217	95
317L	S31703	75	30	35% in 2″	217	95
321	S32100	75	30	40% in 2″	183	88
347	S34700	75	30	40% in 2″	183	88

Heat Treatment for Stainless Steel Flanges

Heat Treatment Process	Application	Purpose
Solution Annealing	Austenitic grades (e.g., 304, 316)	Dissolves chromium carbides, relieves internal stress, maximizes corrosion resistance and ductility.
Stabilization	Stabilized grades (e.g., 321, 347)	Prevents sensitization and intergranular corrosion by combining carbon with stabilizing elements.
Duplex & Super Duplex Treatment	Duplex and Super Duplex grades	Achieves a balanced ferrite-austenite microstructure for high strength and corrosion resistance.

Stainless Steel Plate Flange Pressure Rating

Temperature (°F)	150#	300#	400#	600#	900#	1500#	2500#
-20 to 100	275	720	960	1440	2160	3600	6000
200	230	600	800	1200	1800	3000	5000
300	205	540	720	1080	1620	2700	4500
400	190	495	660	995	1490	2485	4140
500	170	465	620	930	1395	2330	3880
600	140	435	580	875	1310	2185	3640
650	125	430	575	860	1290	2150	3580
700	110	425	565	850	1275	2125	3540
750	95	415	555	830	1245	2075	3460
800	80	405	540	805	1210	2015	3360
850	65	395	530	790	1190	1980	3300
900	50	390	520	780	1165	1945	3240
950	35	380	510	765	1145	1910	3180
1000	20	320	430	640	965	1605	2675
1050	20	310	410	615	925	1545	2570
1100	20	255	345	515	770	1285	2145
1150	20	200	265	400	595	995	1655
1200	20	155	205	310	465	770	1285
1250	20	115	150	225	340	565	945
1300	20	85	115	170	255	430	715
1350	20	60	80	125	185	310	515
1400	20	50	65	95	145	240	400
1450	15	35	45	70	105	170	285
1500	10	25	35	55	80	135	230

Stainless Steel Grades for Flanges

At Solitaire Overseas, we specialize in manufacturing flanges from the most popular and reliable stainless steel grades, ensuring you get the perfect material for your specific needs.

ASTM A182 F304/304L Flanges: The most widely used grade, known for its excellent corrosion resistance and formability. F304L (low carbon) is ideal for welding applications as it minimizes carbide precipitation.
ASTM A182 F316/316L Flanges: Contains molybdenum, which provides superior resistance to pitting and crevice corrosion, especially in chloride-rich environments like marine or coastal settings. F316L is the low-carbon version, preferred for its enhanced weldability.
ASTM A182 F321/347 Flanges: Stabilized grades that are ideal for high-temperature service. F321 contains titanium, and F347 contains niobium to prevent sensitization and intergranular corrosion.
Duplex & Super Duplex Flanges: For extreme strength and corrosion resistance, we offer grades like UNS S31803 (Duplex) and UNS S32750/S32760 (Super Duplex).

Types Of Stainless Steel Flanges (SS Flanges)

As a leading stainless steel flanges manufacturer in India, we produce a wide variety of flanges to suit different pressure ratings, sizes, and connection types. Our product range includes:

Blind Flange

A Blind Flange is a solid, circular plate with boltholes but no center hole, used to seal the ends of piping systems and pressure vessels. It allows easy access for inspections and maintenance.

Weld Neck Flange

Designed for high-pressure applications, Weld Neck Flanges have a long tapered hub that minimizes stress at the flange base. The smooth transition enhances durability and reduces turbulence.

Slip-On Flange

A Slip-On Flange is slid over the pipe and welded both inside and outside. These cost-effective flanges require less precision in pipe cutting and are ideal for low-pressure applications.

Socket Weld Flange

Socket Weld Flanges involve inserting the pipe into the socket end before welding, ensuring a smooth bore and enhanced fluid or gas flow. Mainly used for smaller, high-pressure pipelines.

Threaded Flange

Threaded Flanges resemble slip-on flanges but feature tapered threads for easy connection without welding. Commonly used in low-pressure systems with externally threaded pipes.

Lap Joint Flange

A Lap Joint Flange slides over the pipe and is typically used with stub end fittings. It allows easy rotation and frequent dismantling, ideal for applications requiring regular maintenance.

Applications of Stainless Steel Flanges (SS Flanges)

Pipeline systems and engineering
Oil & Gas sector
Mechanical and plant engineering
Marine and offshore operations
Wastewater treatment plants
Chemical and petrochemical processing
Power generation industry
Aerospace applications
Food and beverage processing
And many other industrial uses

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Why Choose Solitaire Overseas for Stainless Steel Flanges?

Our stainless steel flanges undergo rigorous testing, including PMI, ultrasonic, and chemical composition analysis, to ensure they meet or exceed international standards.
We offer the best stainless steel flanges price without compromising on quality, providing excellent value for your investment.
We are a leading stainless steel flanges exporter, serving clients across the globe with efficient and timely deliveries.
Our large stock of SS flanges in various sizes, grades, and types ensures we can meet your immediate and bulk requirements.
As a dedicated stainless steel flanges manufacturer, we can manufacture flanges to your specific drawings and requirements, providing tailored solutions for your projects.

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Get a Quote for Stainless Steel Flanges

Looking to buy stainless steel flanges? Contact us today to discuss your requirements and get a detailed quote. As a dedicated stainless steel flanges manufacturer and supplier, our team of experts is ready to assist you with the best solutions at the most competitive price.

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FAQS

Stainless steel flanges connect pipelines in industries like oil and gas, chemicals, and water treatment, allowing for easier assembly, disassembly, maintenance, and repairs of pipe sections.

Types of Flanges 1. Welding Neck Flange 2. Slip on Flange 3. Socket Welding Flange 4.

Stainless steel flanges are typically made from grades like ASTM A182 F304/F304L and F316/F316L, offering excellent corrosion resistance. They suit pressure ratings from Class 150 to 2500.

The commonly used ASTM standard for stainless steel flanges is ASTM A182, which covers forged and rolled alloy and stainless steel pipe flanges, fittings, valves, and parts for high-temperature service. The most commonly used materials include ASTM A182 F304/L and F316/L.

The pressure rating of stainless steel flanges varies based on material grade, flange type, and design. It is measured in pounds per square inch (PSI) or pressure classes (e.g., Class 150, 300, 600, etc.). Higher-grade materials and specific flange designs can withstand greater pressure levels.