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Understanding ASTM A182 F316 Flanges
The chemical composition of Stainless Steel 316 flanges is unique as it contains 16-18% of chromium, 10-14% of nickel, and a very important addition of 2-3 percent of molybdenum. Copper and silica as well as phosphorus are also present in small quantities in this composition. The greater level of chromium is what gives it exceptional resistance to corrosion in a wide range of environments. Moreover, this grade is preferred as it has favorable welding and forming properties into other shapes.
UNS S31600 is an austenitic stainless steel whose crystal structure provides high strength and temperature resistance. The addition of 2–3% molybdenum is what differentiates Grade 316 from Grade 304, conferring superior resistance to pitting and crevice corrosion particularly in chloride and acidic environments. Being a popular and reliable product, SS 316 flanges are manufactured under the ASTM A182 specification, which covers forged or rolled alloy and stainless steel pipe flanges for high-temperature and high-pressure service.
Stainless Steel flanges come in many variations and pressure classes to suit industrial needs. Standard classes range from 150 up to 2500, with classes like Class 150 ANSI SS 316 Flanges being very common. The product types include the SS 316 Slip On Flange, often used with seamless pipes where the ability to adjust the pipe position before welding is beneficial. Other essential types are the ASME SA182 SS 316 Weld Neck Flange for high-pressure systems, the ANSI B16.5 SS 316 Blind Flange used to seal off a pipe end, and the Stainless Steel 316 RTJ Flange which uses a special joint design for enhanced sealing. The industry standard, ANSI B16.5, defines the dimensions for flanges from 1/2 inch to 24 inches, with large-bore sizes from 26" to 60" covered under ASME B16.47. Choosing the correct flange type, such as the SS 316 Socket Weld Flange, is critical for meeting the specific requirements of any piping system. Solitaire Overseas supplies ASTM A182 F316 flanges to oil & gas, pharmaceutical, marine, and chemical processing industries across 60+ countries.
Request SS 316 Flanges Quote !Table of Contents
- Stainless Steel 316 Flanges Manufacturer and Supplier
- 316 Stainless Steel Flanges Specifications
- Stainless Steel 316 Flanges Chemical Composition
- SS 316 Flanges Mechanical Properties
- DIN 1.4401 Forged Flanges Physical Properties
- UNS S31600 Stainless Steel Flanges Equivalent Grades
- ASME SA182 / ANSI B16.5 — SS 316 Flange Dimensional Chart (All Types, NPS 1/2" to 24")
- SS 316 Flanges Bolt Pattern & Drilling Dimensions (AS4087 / ANSI / DIN / ISO Standards)
- ASTM A182 F316 Flanges Weight Chart
- SS 316 Flanges Surface Finishes
- Types of Stainless Steel 316 Flanges — Blind, Slip On, Weld Neck, Socket Weld & RTJ
- Stainless Steel 316 Flanges HSN Code
- Applications of 316 Stainless Steel Flanges
- Quality Assurance — Tests Performed on SS 316 Flanges
- Stainless Steel 316 Flanges Price List
- FAQs About Stainless Steel 316 Flanges
ASTM A182 F316 Stainless Steel 316 Flanges — Manufacturer & Global Supplier
As a leading manufacturer and supplier of SS 316 Flanges, Solitaire Overseas specializes in providing products across various standards and scales, including the A182 F316 Slip On Flange, the ASME SA182 SS 316 Weld Neck Flange, the ASTM A182 F316 BLRF (Blind Raised Face) Flange, and forged or plate flanges engineered to fulfil distinct and critical functions within industrial piping systems.
With over 25 years in business, Solitaire Overseas maintains ready stock of SS 316 flanges in Class 150 through 2500 for fast dispatch worldwide. All flanges are manufactured under ISO 9001:2015 quality management and tested to EN 10204 3.1 / 3.2 MTC standards. Available as forged (ASTM A182 F316) and plate flanges (ASTM A240 Gr. 316) specify requirement at time of order. Grade F316 material can be readily hot-forged at 1000–1200°C, enabling precise flange geometries across all pressure classes.
For more information and pricing on Stainless Steel 316 Flanges, please contact us directly.
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316 Stainless Steel Flanges Specifications
The table below outlines the key technical specifications for 316 stainless steel flanges.
| Category | Specification Details |
|---|---|
| Size | 1/8" NB – 24" NB (ASME B16.5) | 26" NB – 60" NB available under ASME B16.47 Series A & B |
| Standard | ASME B16.5 / ASME B16.47 |
| Pressure Rating | Class 150 – 2500 |
| PN Range | PN6 – PN64 |
| Face Type | FF / RF / RTJ |
| Process | Forging / Casting |
| MTC Certificate | EN 10204 3.1 & 3.2 |
| Flange Finish | Smooth / Serrated |
| Types | Blind, Weld Neck, Slip-on, Socket Weld, Orifice, Threaded and Lap Joint |
Stainless Steel 316 Flanges Chemical Composition
The distinct corrosion resistance of 316 stainless steel flanges is defined by the following chemical composition, particularly the inclusion of Molybdenum.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 316 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 11.00 – 14.00 | 67.845 min |
SS 316 Flanges Mechanical Properties
Here are the standard mechanical properties for SS 316 flange material, which determine its strength and performance under stress.
| Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|---|
| 8.0 g/cm³ | 1400°C (2550°F) | 75,000 PSI / 515 MPa | 30,000 PSI / 205 MPa | 35% |
DIN 1.4401 Forged Flanges Physical Properties
The table below details the physical properties, such as thermal and electrical characteristics, of ASTM A182 316 material (DIN 1.4401).
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity (W/m·K) | Specific Heat 0–100°C (J/kg·K) | Electrical Resistivity (nΩ·m) |
|---|---|---|---|---|---|---|
| 316 | 8000 | 193 | 15.9 (0–100°C)16.2 (0–315°C)17.5 (0–538°C) | 16.3 (at 100°C)21.5 (at 500°C) | 500 | 740 |
UNS S31600 Stainless Steel Flanges Equivalent Grades
This table lists the common equivalent international grades for the UNS S31600 designation.
| Standard | Werkstoff Nr. | UNS | JIS | BS | GOST | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| 316 | 1.4401 / 1.4436 | S31600 | SUS 316 | 316S31 / 316S33 | – | Z7CND17-11-02 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 |
ASME SA182 / ANSI B16.5 — SS 316 Flange Dimensional Chart (All Types, NPS 1/2" to 24")
The following chart provides detailed dimensional data for all SS 316 flange types per ASME SA182 / ANSI B16.5 (NPS 1/2" – 24").
| NPS | OD of Flange | Thickness | Raised Face Dia. | Hub Dia. at Base | Length Thru Hub (WN) | Length Thru Hub (SO/T/SK) | Length Thru Hub (LJ) | Bore (SO/SK) | Bore (LJ) | Hub Dia. at Bevel | Fillet Radius | Socket Depth |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3-1/2 | 7/16 | 1-3/8 | 1-3/16 | 1-7/8 | 5/8 | 5/8 | .88 | .90 | .84 | 1/8 | 3/8 |
| 3/4 | 3-7/8 | 1/2 | 1-11/16 | 1-1/2 | 2-1/16 | 5/8 | 5/8 | 1.09 | 1.11 | 1.05 | 1/8 | 7/16 |
| 1 | 4-1/4 | 9/16 | 2 | 1-15/16 | 2-3/16 | 11/16 | 11/16 | 1.36 | 1.38 | 1.32 | 1/8 | 1/2 |
| 1-1/4 | 4-5/8 | 5/8 | 2-1/2 | 2-5/16 | 2-1/4 | 13/16 | 13/16 | 1.70 | 1.72 | 1.66 | 3/16 | 9/16 |
| 1-1/2 | 5 | 11/16 | 2-7/8 | 2-9/16 | 2-7/16 | 7/8 | 7/8 | 1.95 | 1.97 | 1.90 | 1/4 | 5/8 |
| 2 | 6 | 3/4 | 3-5/8 | 3-1/16 | 2-1/2 | 1 | 1 | 2.44 | 2.46 | 2.38 | 5/16 | 11/16 |
| 2-1/2 | 7 | 7/8 | 4-1/8 | 3-9/16 | 2-3/4 | 1-1/8 | 1-1/8 | 2.94 | 2.97 | 2.88 | 5/16 | 3/4 |
| 3 | 7-1/2 | 15/16 | 5 | 4-1/4 | 2-3/4 | 1-3/16 | 1-3/16 | 3.57 | 3.60 | 3.50 | 3/8 | 13/16 |
| 3-1/2 | 8-1/2 | 15/16 | 5-1/2 | 4-13/16 | 2-13/16 | 1-1/4 | 1-1/4 | 4.07 | 4.10 | 4.00 | 3/8 | 7/8 |
| 4 | 9 | 15/16 | 6-3/16 | 5-5/16 | 3 | 1-5/16 | 1-5/16 | 4.57 | 4.60 | 4.50 | 7/16 | 15/16 |
| 5 | 10 | 15/16 | 7.5/16 | 6-7/16 | 3-1/2 | 1-7/16 | 1-7/16 | 5.66 | 5.69 | 5.56 | 7/16 | 15/16 |
| 6 | 11 | 1 | 8-1/2 | 7-9/16 | 3-1/2 | 1-9/16 | 1-9/16 | 6.72 | 6.75 | 6.63 | 1/2 | 1-1/16 |
| 8 | 13-1/2 | 1-1/8 | 10-5/8 | 9-11/16 | 4 | 1-3/4 | 1-3/4 | 8.72 | 8.75 | 8.63 | 1/2 | 1-1/4 |
| 10 | 16 | 1-3/16 | 12-3/4 | 12 | 4 | 1-15/16 | 1-15/16 | 10.88 | 10.92 | 10.75 | 1/2 | 1-5/16 |
| 12 | 19 | 1-1/4 | 15 | 14-3/8 | 4-1/2 | 2-3/16 | 2-3/16 | 12.88 | 12.92 | 12.75 | 1/2 | 1-9/16 |
| 14 | 21 | 1-3/8 | 16-1/4 | 15-3/4 | 5 | 2-1/4 | 3-1/8 | 14.14 | 14.18 | 14.00 | 1/2 | 1-5/8 |
| 16 | 23-1/2 | 1-7/16 | 18-1/2 | 18 | 5 | 2-1/2 | 3-7/16 | 16.16 | 16.19 | 16.00 | 1/2 | 1-3/4 |
| 18 | 25 | 1-9/16 | 21 | 19-7/8 | 5-1/2 | 2-11/16 | 3-13/16 | 18.18 | 18.20 | 18.00 | 1/2 | 1-15/16 |
| 20 | 27-1/2 | 1-11/16 | 23 | 22 | 5-11/16 | 2-7/8 | 4-1/16 | 20.20 | 20.25 | 20.00 | 1/2 | 2-1/8 |
| 24 | 32 | 1-7/8 | 27-1/4 | 26-1/8 | 6 | 3-1/4 | 4-3/8 | 24.25 | 24.25 | 24.00 | 1/2 | 2-1/2 |
SS 316 Flanges Bolt Pattern & Drilling Dimensions (AS4087 / ANSI / DIN / ISO Standards)
The tables below detail bolt-circle and drilling dimensions for SS 316 flanges across AS4087, AS 2129, ANSI B16.5 and ISO 7005 (DIN) standards.
| Standard | Class | Flange OD (mm) | Bolt Circle Dia. (mm) | No. of Bolts | Bolt Size (mm) | Bolt Hole Dia. (mm) |
|---|---|---|---|---|---|---|
| AS4087 | PN14 | 95 | 67 | 4 | M12 | 14 |
| AS 2129 Flange | Table C | 95 | 67 | 4 | 13 | 14 |
| Table D | 95 | 67 | 4 | 13 | 14 | |
| Table E | 95 | 67 | 4 | 13 | 14 | |
| Table F | 95 | 67 | 4 | 13 | 14 | |
| Table H | 114 | 83 | 4 | 16 | 17 | |
| Table J | 114 | 83 | 4 | 16 | 17 | |
| ANSI B16.5 | ANSI 150 | 89 | 60 | 4 | 13 | 16 |
| ANSI 300 | 95 | 67 | 4 | 13 | 16 | |
| ANSI 600 | 95 | 67 | 4 | 13 | 16 | |
| ANSI 900 | 121 | 83 | 4 | 19 | 22 | |
| ANSI 1500 | 121 | 83 | 4 | 19 | 22 | |
| ISO 7005 (DIN) Flange | 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 |
ASTM A182 F316 Flanges Weight Chart
The table below lists approximate flange weights (kg) for ASTM A182 F316 Weld Neck Raised Face (WNRF) flanges per ASME B16.5. Weights vary by flange type; contact us for slip-on, blind, and socket weld weights.
| NPS | OD (mm) | Class 150 (kg) | Class 300 (kg) | Class 600 (kg) | Class 900 (kg) | Type |
|---|---|---|---|---|---|---|
| 1/2 | 21.3 | 0.45 | 0.55 | 0.70 | 0.80 | WNRF |
| 3/4 | 26.7 | 0.55 | 0.70 | 0.80 | 1.10 | WNRF |
| 1 | 33.4 | 0.90 | 1.10 | 1.35 | 1.60 | WNRF |
| 1-1/4 | 42.2 | 1.20 | 1.45 | 1.80 | 2.30 | WNRF |
| 1-1/2 | 48.3 | 1.50 | 1.85 | 2.20 | 2.90 | WNRF |
| 2 | 60.3 | 2.27 | 2.95 | 4.08 | 5.44 | WNRF |
| 2-1/2 | 73.0 | 3.40 | 4.50 | 5.90 | 7.70 | WNRF |
| 3 | 88.9 | 4.80 | 6.35 | 8.60 | 11.8 | WNRF |
| 4 | 114.3 | 6.80 | 9.52 | 13.6 | 18.1 | WNRF |
| 5 | 141.3 | 9.50 | 13.6 | 19.5 | 26.8 | WNRF |
| 6 | 168.3 | 14.5 | 21.8 | 31.3 | 43.5 | WNRF |
| 8 | 219.1 | 24.9 | 37.6 | 55.3 | 79.4 | WNRF |
| 10 | 273.0 | 42.6 | 64.0 | 93.0 | 135 | WNRF |
| 12 | 323.8 | 65.8 | 98.9 | 143 | 211 | WNRF |
| 14 | 355.6 | 85.3 | 128 | 196 | 290 | WNRF |
| 16 | 406.4 | 115 | 172 | 263 | 390 | WNRF |
| 18 | 457.2 | 153 | 230 | 352 | 525 | WNRF |
| 20 | 508.0 | 196 | 295 | 452 | 675 | WNRF |
| 24 | 609.6 | 308 | 463 | 710 | 1060 | WNRF |
SS 316 Flanges Surface Finishes
SS 316 RTJ flanges and other types come with several surface finishes, which include:
- Mill Finish: Standard finish for most common applications, including the Inox 316 SORF flange. Used as a base before further mechanical polishing.
- No. 1 Finish: Produced by hot rolling UNS S31600 flanges, followed by annealing and acid pickling. Results in a dull, rough surface suitable for high-temperature applications.
- 2D Finish: Produced by cold rolling, then annealing and pickling. Smoother than No. 1. Commonly used in chemical equipment, hardware, and automotive exhaust components.
- No. 2B Finish: Cold rolled, annealed, pickled, and skin-passed. Standard surface for sheet and fabricated flanges. Smooth, slightly reflective.
- No. 4 Finish: Brushed / polished finish. Common in food processing, pharmaceutical, and dairy applications where hygiene and cleanability are required.
- BA — Bright Annealed: Bright, mirror-like surface produced by annealing in a controlled atmosphere. Used in decorative, medical, and hygienic service applications.
Types of Stainless Steel 316 Flanges - Blind, Slip On, Weld Neck, Socket Weld & RTJ
The 316 stainless steel flange is available in several configurations, each suited for a specific piping connection and pressure requirement:
Stainless Steel 316 Blind Flange
- 150#
- 300#
- 600#
316 Stainless Steel Sip on flange
- Flat face
- Raised face
- Ring joint
UNS S31600 Forged Flange
- Lap joint
- Male and female
- Tongue and groove
Inox 316 Weld Neck Flange
- Class 900
- Class 1500
- Class 2500
DIN 1.4401 Socket Weld Flange
- ASME B16.5
- ANSI B16.5
- ASME B16.47
- ANSI B16.47
AISI 316 RTJ Flange
- Stock Finish
- Smooth Finish
Stainless Steel 316 Flanges HSN Code
| Product | Material | HSN Code |
|---|---|---|
| Stainless Steel Flanges | Stainless Steel | 73072100 |
The HSN code 73072100 is used for customs classification of stainless steel flanges for export documentation, GST invoicing, and import duty calculation in India and international trade.
Applications of 316 Stainless Steel Flanges
316 Stainless Steel Flanges are utilised in highly demanding industrial environments where superior corrosion resistance and strength are critical. Key application sectors include:
- Nuclear Power Generation: Primarily requires seamless and traceable components; SS 316 meets the purity and radiation-resistance demands of nuclear cooling loops.
- Bitumen Upgraders & Heavy Oil Refineries: High-temperature, high-pressure service with sulphur-bearing fluids where molybdenum-enhanced corrosion resistance is essential.
- Petrochemical & Acid Processing: SS 316 flanges are used extensively in chemical reactors, acid pipelines, and process streams containing halide or sulphur compounds.
- Marine & Offshore Structures: Resists chloride-induced pitting in seawater pipelines, ballast systems, and offshore platform piping where salt exposure is continuous.
- Food, Beverage & Dairy Processing: Molybdenum content meets hygiene and corrosion standards for potable water and food-grade piping; No. 4 and BA finishes typically specified.
- Pharmaceutical & Biotech Plants: Pitting resistance and smooth-surface finishes make SS 316 the standard in pharmaceutical process piping, CIP systems, and sterile environments.
- Seawater Desalination & Water Treatment: SS 316 slip-on and weld-neck flanges are used in RO plant pipework and water treatment where moderate chloride levels are present.
- Pulp & Paper Mills: Corrosion-resistant to bleaching chemicals and acid/alkali wash cycles common in cellulose and paper production.
- Cooling Water Lines & Fire-Fighting Systems: SS 316 slip-on flanges are the standard for cooling water distribution, fire-fighting ring mains, and low-pressure compressed air networks.
Need ASTM A182 F316 flanges for your project? Request a quote within 60 minutes — call +91-9619103479 or email vishal@solitaire-overseas.com
Quality Assurance — Tests Performed on SS 316 Flanges
To guarantee robust mechanical properties and ensure compliance with industrial demands, SS 316 lap joint flanges and all other types undergo rigorous testing. These quality assurance checks confirm the flange will perform reliably across all application environments.
The tests performed include:
- NDT (Non-Destructive Testing)
- Ultrasonic Testing (UT)
- Eddy-Current Testing
- Radiographic Testing (RT)
- Hydrostatic Pressure Test
- Positive Material Identification (PMI)
- Hardness Test (Brinell / Rockwell)
- Intergranular Corrosion (IGC) Test
- Tensile & Yield Strength Test
For a comprehensive quality policy, please refer to the Quality Policy page on our website.
Related Products of 316 Stainless Steel
Stainless Steel 316 Flanges Price List
| SIZE | Saudi Riyal | USD |
|---|---|---|
| 1/2″ #150 WNRF flange | 30.17 SAR | $7.92 |
| 1/2″ #300 weld neck flange | 45.71 SAR | $12.00 |
| 1/2″ #600 weld neck flange | 59.43 SAR | $15.60 |
Please note: This is a partial price list. Check the latest price list of stainless steel 316 flange by contacting us directly for the most current and complete pricing information.
Request SS 316 Flanges Quote !Frequently Asked Questions About Stainless Steel 316 Flanges
Yes. The SS 316 blind flange exhibits excellent corrosion resistance in a wide range of environments. It is generally a better choice than Grade 304 in warm or chloride-rich environments because it resists both crevice corrosion and pitting, owing to its molybdenum content.
SS Grade F316 socket weld flanges per ASME B16.5 are available from 1/2" to 2" NPS. Slip-on, weld neck, blind, and lap-joint flanges under B16.5 range from 1/2" to 24" NPS. Large-bore sizes from 26" to 60" are covered under ASME B16.47 Series A and B. Contact us to confirm available stock for your required size.
The choice depends on the application — neither is universally superior. SS 316 is the preferred option in highly corrosive environments involving chlorides (marine, chemical processing, desalination) because molybdenum significantly increases resistance to pitting and crevice corrosion. SS 304 is the more economical choice for general-purpose applications where aggressive chemicals or salt exposure are not present. Choose 304 for cost-effectiveness in standard environments; choose 316 wherever maximum corrosion resistance is required.
SS 316 flanges can be used in continuous oxidising service up to 925°C (1700°F) and up to 870°C (1600°F) for intermittent service. For sustained high-temperature service above 425°C, Grade 316H (higher carbon variant) is recommended to avoid sensitisation. Grade 316L is preferred below 425°C where post-weld corrosion resistance is critical.
316L is the low-carbon variant of Grade 316, with a maximum carbon content of 0.03% versus 0.08% in standard 316. The reduced carbon minimises carbide precipitation at grain boundaries during welding, preventing intergranular corrosion at weld heat-affected zones. Both grades are frequently dual-certified and share identical mechanical properties in most forms. Specify 316L for welded fabrications or any application where post-weld heat treatment is not possible.
The primary end users of SS 316 flanges are the chemical processing, oil & gas, marine and offshore, pharmaceutical, food & dairy, and water treatment industries — essentially any application where chloride resistance, hygiene, or elevated temperature service are required. The addition of molybdenum makes Grade 316 the standard material specification wherever Grade 304 is considered insufficient.
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