Stainless Steel 316 Flanges

Stainless Steel 316 Flanges are pipe connecting components that are made of UNS S31600, an austenitic stainless steel alloyed with molybdenum (2-3%). It is the inclusion of molybdenum that distinguishes 316 from 304 and offers significant resistance to chloride pitting and crevice corrosion and acidic process conditions. Standard 316 has a maximum carbon content of 0.08% and is slightly greater in tensile and yield strength than 316L at ambient temperatures. It is the recommended grade where the highest strength is required, and the possibility of sensitisation in the weld zone is not an issue.

These flanges are available across all standard face types, pressure classes, and flange forms. Marine, chemical, pharmaceutical, and industrial environments rely on these dependable components. Global process industries frequently specify SS 316 Flanges because they combine corrosion resistance, strength, and wide market availability.

Price of Stainless Steel 316 Flanges

Get the most competitive pricing for SS 316 flanges for your project. The latest price list offers economical stainless steel 316 flanges for high-pressure, corrosion-resistant systems.

Price Per Unit / Kg

SS 316 Flanges are priced between ₹260 and ₹350 per kg in the Indian market. International pricing tracks LME nickel and molybdenum rates closely. Standard 316 and 316L are priced comparably in most markets; the slight carbon difference between the two grades does not significantly affect raw material cost.

Factors Affecting Price

Nickel and molybdenum content drive raw material cost above standard 304 flanges. Pressure class, size, facing type, and certification level all affect final pricing. ASTM A182-certified forged material commands a premium over non-certified stock. Bulk orders with consolidated specifications deliver better per-unit pricing.

Types of Stainless Steel 316 Flanges

To check out the different types of Stainless Steel 316 Flanges, you can refer to the following table.

Stainless Steel 316 Weld Neck Flanges (WN)
Stainless Steel 316 Slip-On Flanges (SO)
Stainless Steel 316 Blind Flanges (BL)
Stainless Steel 316 Socket Weld Flanges (SW)
Stainless Steel 316 Threaded Flanges (TH)
Stainless Steel 316 Lap Joint Flanges (LJ)
Stainless Steel 316 Long Weld Neck Flanges (LWN)
Stainless Steel 316 Orifice Flanges
Stainless Steel 316 Reducing Flanges
Stainless Steel 316 Spectacle Blind Flanges
Stainless Steel 316 Ring Type Joint (RTJ) Flanges

Specifications of Stainless Steel 316 Flanges

The specifications of Stainless Steel 316 Flanges, including size, standard, and pressure class, are listed in the table below.

Parameter	Fact-Checked & Recreated Details
Material Grade	SS 316 / UNS S31600 / Werkstoff Nr. 1.4401 / SUS 316
Standards	ASTM A182 / ASME SA182
Pressure Ratings (Class)	Class 150, 300, 400, 600, 900, 1500, and 2500
Size Range	1/2" NB (15 NB) to 48" NB (1200 NB) standard; custom sizes up to 60" NB
Production Forms	Forged, Rolled, Plate Cut

Chemical Properties of Stainless Steel 316 Flanges

The chemical composition of Stainless Steel 316 Flanges, including its proportions, is listed in the table below.

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N
316 Min	—	—	—	—	—	16.0	2.0	10.0	—
316 Max	0.08	2.0	0.75	0.045	0.030	18.0	3.0	14.0	0.10

Mechanical Properties of Stainless Steel 316 Flanges

The mechanical properties of Stainless Steel 316 Flanges, including tensile strength, yield strength, and elongation, are listed below.

Property	Value
Tensile Strength	515 MPa min
Yield Strength (0.2% Offset)	205 MPa min
Elongation (% in 50 mm)	40% min
Hardness (Brinell)	217 HB max

Physical Properties of Stainless Steel 316 Flanges

The physical properties of Stainless Steel 316 Flanges are listed in the table below, along with density and thermal conductivity.

Grade	Density (kg/m³)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (µm/m/°C) 0–100°C	Thermal Conductivity (W/m.K) at 100°C	Specific Heat (J/kg.K)	Elec Resistivity (nΩ.m)
316	8000	193	15.9	16.3	500	740

Dimension Chart of Stainless Steel 316 Flanges

Refer to the following dimension table to ensure accurate bolting and sizing for your specific flange standard requirements.

Standard	Class / Table	Diameter (mm)	Bolt Circle Diameter (mm)	Number of Bolts	Bolt Size	Bolt Hole Diameter (mm)
AS 4087	PN14	95	67	4	M12	14
AS 2129	Table C	95	67	4	1/2"	14
Table D	95	67	4	1/2"	14
Table E	95	67	4	1/2"	14
Table F	95	67	4	1/2"	14
Table H	114	83	4	5/8"	17
Table J	114	83	4	5/8"	17
ANSI B16.5	Class 150	89	60	4	1/2"	16
Class 300	95	67	4	1/2"	16
Class 600	95	67	4	1/2"	16
Class 900	121	83	4	3/4"	22
Class 1500	121	83	4	3/4"	22
ISO 7005 (DIN)	PN6	80	55	4	M10	11
PN10	95	65	4	M12	14
PN16	95	65	4	M12	14
PN20	90	60.5	4	M14	16
PN25	95	65	4	M12	14
PN40	95	65	4	M12	14

Dimensions per ASME B16.5 Class 150. Confirm dimensions for other pressure classes with your supplier.

Size Chart of Stainless Steel 316 Flanges

Consult this size chart to verify the nominal bore and pressure ratings available for various stainless steel 316 flange types.

Flange Type	Size Range (NB)	Pressure Class	Dimensional Standard
Weld Neck	1/2" – 24"	Class 150 – 2500	ASME B16.5
Slip-On	1/2" – 24"	Class 150 – 1500	ASME B16.5
Blind	1/2" – 24"	Class 150 – 2500	ASME B16.5
Socket Weld	1/2" – 3"	Class 150 – 1500	ASME B16.5
Threaded	1/2" – 4"	Class 150 – 2500	ASME B16.5
Lap Joint	1/2" – 24"	Class 150 – 1500	ASME B16.5
Large Diameter	26" – 60"	Class 75 – 900	ASME B16.47 (Series A & B)

Pressure Rating Chart of Stainless Steel 316 Flanges

For specific pressure ratings, please refer to the Stainless Steel 316 Flanges Pressure Rating Chart below.

Class	Pressure Rating at –29 to 38°C (bar)	Pressure Rating at 100°C (bar)	Pressure Rating at 200°C (bar)	Pressure Rating at 300°C (bar)
150	19.6	18.4	16.5	14.4
300	51.1	48.0	43.1	37.4
600	102.1	96.0	86.2	74.9
900	153.2	144.0	129.3	112.3
1500	255.3	240.0	215.5	187.2
2500	425.5	400.0	359.2	312.0

Pressure ratings per ASME B16.5 for Group 2.3 (316). Standard 316 retains marginally higher ratings at elevated temperatures than 316L. Always verify with the relevant ASME B16.5 table for your exact service condition.

Key Features of Stainless Steel 316 Flanges

Review the core characteristics of these high-performance components. Explore the primary features of Stainless Steel 316 Flanges below:

Corrosion Resistance
High Strength
Non-Magnetic
Temperature Toughness
Weld Compatibility
Versatile Facing
Low Maintenance
Certified Compliance

Applications of Stainless Steel 316 Flanges

Discover the primary industrial settings where these components are utilised. Below are the key applications for Stainless Steel 316 Flanges:

Chemical Processing
Oil & Gas
Marine & Offshore
Pharmaceuticals
Food & Beverage
Desalination Plants
Petrochemical Systems
Pulp & Paper
Power Generation
Architectural Piping

How to Choose the Right Stainless Steel 316 Flanges Supplier?

Before purchasing from a Stainless Steel 316 Flanges Supplier, please consider the following points, as it will make your purchase process way smoother and will help you to get the appropriate material as per your project needs.

Supplier Selection Criteria

Verify the supplier provides mill test certificates with full heat and lot traceability. Standard 316 and 316L are frequently confused or interchanged by unverified suppliers. Check the carbon content on the MTC and confirm the grade matches your specification before accepting material. Request EN 10204 3.1 as a minimum; EN 10204 3.2 is required for pressure equipment and ASME-stamped systems.

Technical Considerations

Confirm the flange standard and pressure class before ordering. ASME B16.5 covers sizes up to 24" NB; ASME B16.47 covers 26" NB and above. RF, FF, or RTJ facings on your gasket and the mating flange should match. Consideration should be given to the use of 316L filler metal in welded systems above 425°C to reduce heat sensitisation. For welded systems, particularly those > 425°C, utilise 316L filler metal to avoid heat sensitisation.

Quality & Certification Check

Prioritise suppliers with ISO 9001:2015 certification and third-party inspection capability from SGS, BV, TUV, or Lloyds. For PED-compliant European projects, confirm EN 1092-1 documentation is available. All flanges should be supplied in the solution-annealed condition; confirm that heat treatment records are included before dispatch.

Procurement Tips for Bulk Orders

Can make documentation easier and save prices by combining flange types, sizes, and pressure classes with one supplier. This allows the vendor-qualified supplier to be selected for recurring contracts, eliminating recurrent quality verification. For new procurement cycles, collect MTCs and bids from two or three suppliers to verify materials and to benchmark pricing.