SS 316 Flanges
Stainless Steel 316 / 316L flanges supplied to ASTM A182 F316/F316L from our Mumbai stockyard. SS 316 adds 2–3% molybdenum to the 18/8 base, which markedly improves resistance to pitting and crevice corrosion in chloride environments. It is the default grade for marine, coastal and chemical process service. 316L, the low-carbon variant, is specified for welded construction.
Governing Standards for SS 316 Flanges
State the standard on your enquiry and we will confirm stock against it.
| Standard | Covers |
|---|---|
| ASTM A182 F316/F316L | Forged fittings and flanges |
SS 316 Chemical Composition (%)
Composition and mechanical values are the limits set by the governing ASTM specification and are given for reference. The mill test certificate supplied with your consignment carries the actual heat analysis.
| Element | 316 (S31600) | 316L (S31603) |
|---|---|---|
| Carbon | 0.08 max | 0.030 max |
| Chromium | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum | 2.00 – 3.00 | 2.00 – 3.00 |
| Manganese | 2.00 max | 2.00 max |
| Silicon | 0.75 max | 0.75 max |
| Phosphorus | 0.045 max | 0.045 max |
| Sulphur | 0.030 max | 0.030 max |
SS 316 Flanges Specifications
SS 316 Flanges — Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| TP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | — | N 0.10 |
| TP 304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–13.0 | — | N 0.10 |
| TP 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 11.0–14.0 | 2.00–3.00 | N 0.10 |
| TP 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 10.0–15.0 | 2.00–3.00 | N 0.10 |
| TP 321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–12.0 | — | Ti ≥ 5 × C |
| TP 347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–13.0 | — | Nb ≥ 10 × C |
| TP 310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0–26.0 | 19.0–22.0 | — | — |
| TP 317L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 11.0–15.0 | 3.00–4.00 | N 0.10 |
Note: Per ASTM A312 / A240. Values are maximum % by weight unless a range is shown. ASTM A312 permits 0.035% max carbon on L grades, where ASTM A240 plate specifies 0.030% max.
SS 316 Flanges — Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| TP 304 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 304L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 321 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 347 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 310S | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
Note: Specified minimum values in the solution-annealed condition, per ASTM A312 / A240. Elongation is measured in 50 mm (2 in.).
SS 316 Flanges — Size Range & Supply Condition
| Parameter | Range |
|---|---|
| Size range | 1/2" NB to 24" NB (ASME B16.5); 26" to 60" NB (ASME B16.47 Series A / B) |
| Pressure class | Class 150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| Types | Weld neck, slip-on, blind, socket weld, lap joint, threaded, reducing, spectacle blind, ring joint, orifice, long weld neck |
| Facing | Raised face (RF), flat face (FF), ring type joint (RTJ), tongue & groove, male & female |
| Face finish | Serrated spiral, serrated concentric, smooth — 125 to 250 AARH |
| Standards | ASME B16.5, B16.47, B16.36, B16.48, MSS SP-44, EN 1092-1, DIN, JIS, BS |
SS 316 Flanges — Physical Properties
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Melting range | 1400–1450 °C | 1375–1400 °C |
| Modulus of elasticity | 193 GPa | 193 GPa |
| Thermal conductivity (100 °C) | 16.2 W/m·K | 16.3 W/m·K |
| Specific heat (0–100 °C) | 500 J/kg·K | 500 J/kg·K |
| Thermal expansion (0–100 °C) | 17.2 µm/m·°C | 15.9 µm/m·°C |
| Electrical resistivity | 720 nΩ·m | 740 nΩ·m |
| Max continuous service temp. | ≈ 870 °C | ≈ 925 °C |
| Magnetic response (annealed) | Non-magnetic | Non-magnetic |
Note: Values at 20 °C unless stated. Thermal expansion matters when austenitic stainless is welded to carbon steel.
SS 316 Flanges — Equivalent Grades Across Standards
| ASTM / AISI | UNS | EN / DIN | EN Name | JIS | GB |
|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | X5CrNi18-10 | SUS 304 | 06Cr19Ni10 |
| 304L | S30403 | 1.4307 | X2CrNi18-9 | SUS 304L | 022Cr19Ni10 |
| 316 | S31600 | 1.4401 | X5CrNiMo17-12-2 | SUS 316 | 06Cr17Ni12Mo2 |
| 316L | S31603 | 1.4404 | X2CrNiMo17-12-2 | SUS 316L | 022Cr17Ni12Mo2 |
| 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 | 06Cr18Ni11Ti |
| 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 06Cr18Ni11Nb |
| 310S | S31008 | 1.4845 | X8CrNi25-21 | SUS 310S | 06Cr25Ni20 |
| 430 | S43000 | 1.4016 | X6Cr17 | SUS 430 | 10Cr17 |
Note: Cross-reference for enquiries written against European, Japanese or Chinese standards. Equivalents are close but not always identical — check the composition limits before substituting.
SS 316 Flanges — Ordering & Supply
| Parameter | Detail |
|---|---|
| Minimum order quantity | 5 kg (mixed sizes within a grade can be combined to reach the MOQ) |
| Price basis | Ex-works Mumbai, FOB or CIF — quoted per kg, per metre or per piece depending on the form |
| Lead time | Ready stock dispatched in 1–3 working days; mill orders typically 2–6 weeks |
| Certification | Mill test certificate to EN 10204 3.1 as standard; 3.2 with third-party witness, IBR and NACE MR0175 on request |
| Testing available | PMI, IGC (ASTM A262), hydrostatic, ultrasonic, radiographic, impact and hardness testing |
| Third-party inspection | Bureau Veritas, TÜV, DNV, SGS, Lloyd's Register, Intertek, RITES and client/EPC inspection |
| Packing | Wooden crates or pallets, plastic caps on pipe ends, VCI wrapping where required, seaworthy export packing |
| Payment terms | Advance, against proforma invoice, or LC at sight for export orders |
| Supply area | Across India and export to the Middle East, Europe, the USA, Africa and South East Asia |
| Product form | Flanges |
Note: Cut lengths, non-standard sizes and special certification are available on request. Prices are quoted against grade, size, schedule and quantity.
Values shown are the specified minima and maxima published in the governing standards and are given for guidance. The mill test certificate supplied with your consignment reports the actual results for that heat.
When to specify SS 316 for flange work
Choose 316 or 316L wherever chlorides are present — coastal installations, seawater cooling, brines, bleaches and many process chemicals — and in pharmaceutical and food plant where aggressive cleaning chemicals are used. If chloride levels or temperatures are higher still, or if higher strength would allow a lighter section, consider Duplex 2205.
Products in this range
SS 316 in other forms
- SS 316 Pipes & Tubes
- SS 316 Fittings
- SS 316 Sheets, Plates & Coils
- SS 316 Bars & Rods
- SS 316 Channels & Angles
Full composition, properties and equivalents on the Stainless Steel 316 / 316L grade page.
Frequently Asked Questions
- Is 316 always better than 304?
- Better in chlorides, not universally. The molybdenum in 316 buys pitting resistance and costs roughly 25–40% more. In dry indoor service, freshwater or architectural work away from the coast, 304 performs identically and specifying 316 simply raises the bill. Choose on the environment, not on the grade number.
- What does the "L" mean and when do I need it?
- L denotes low carbon — 0.030% maximum instead of 0.08%. It matters when the component is welded: lower carbon suppresses chromium carbide precipitation in the heat-affected zone and protects against intergranular attack. For welded pipe, fittings and fabricated assemblies specify 316L. Dual-certified 316/316L material, which meets both, is common and usually the practical choice.
Send your SS 316 Flanges requirement
Give us the size, schedule or thickness, quantity and standard and we will confirm stock and send a firm price. Minimum order quantity 5 kg, mill test certificate to EN 10204 3.1 with every consignment.