316 Stainless Steel Fittings – Marine-Grade Champion for the World's Most Aggressive Environments
For more than six decades, 316 Stainless Steel Fittings have reigned as the undisputed champion of marine and chemical piping assemblies. The strategic addition of 2.0–3.0 % molybdenum transforms standard 18/8 stainless into a pitting- and crevice-corrosion-resistant powerhouse, outperforming 304 in chloride-rich seawater, aggressive chemical brines, and coastal atmospheres. Whether you are building a desalination plant, fabricating yacht exhaust systems, or installing pharmaceutical WFI lines, 316 Stainless Steel Fittings deliver the cleanliness, pressure integrity, and lifetime value that premium projects demand.
316 Stainless Steel Fittings – Superior Corrosion Resistance in Marine and Chemical Environments
Key Features & Benefits
- 2–3 % Mo for superior pitting & crevice corrosion resistance in chlorides
- Continuous service from –196 °C to 870 °C; excellent creep strength
- Hygienic, non-porous surface – meets FDA, USP Class VI, EU 1935/2004
- Bright annealed BA and 2B finishes for pharma and semiconductor ultra-high purity
- Fully austenitic – non-magnetic, even after heavy cold forming
- Weldable by TIG, laser, plasma; post-weld anneal optional for most services
- Full compliance with ASTM A182, A403, A351, ASME B16.11, B16.9, EN 10253-4, PED 2014/68/EU
Technical Specifications
Table 1 – Chemical & Mechanical Properties (ASTM A403 WP316/316L)
| Property | 316 | 316L |
|---|---|---|
| Cr % | 16.0–18.0 | 16.0–18.0 |
| Ni % | 10.0–14.0 | 10.0–14.0 |
| Mo % | 2.0–3.0 | 2.0–3.0 |
| C % | ≤0.08 | ≤0.03 |
| Tensile MPa | ≥515 | ≥485 |
| Yield MPa (0.2 %) | ≥205 | ≥170 |
| Elongation % | ≥40 | ≥40 |
| Hardness HRB | ≤95 | ≤95 |
Table 2 – Pressure Ratings (common classes)
| Class/Sch | 150 lb Threaded | 3000 lb Socket-Weld | Butt-Weld Sch 40S |
|---|---|---|---|
| 1/2" | 1,370 psi @ 20 °C | 3,000 psi @ 20 °C | 2,850 psi @ 20 °C |
| 1" | 1,120 psi @ 20 °C | 3,000 psi @ 20 °C | 2,430 psi @ 20 °C |
| 2" | 920 psi @ 20 °C | 3,000 psi @ 20 °C | 2,000 psi @ 20 °C |
Derating factors apply above 100 °C – see ASME B16.5 for full tables.
Product Range Overview
| Fitting Type | Size Range | Standards | Finish Options |
|---|---|---|---|
| 316 stainless steel threaded fittings (NPT/BSPT) | 1/8"–4" | ASME B16.11, ISO 7-1 | Pickled, polished |
| 316 stainless steel compression fittings | 1/8"–2" | DIN 2353, ISO 8434-1 | Bright annealed |
| 316 stainless steel ball valves sanitary fittings (tri-clamp, 3A) | ½"–6" | 3A, FDA, ASTM A351 CF8M | Mirror Ra ≤0.4 µm |
| Butt-weld elbows, tees, reducers, caps | ½"–48" | ASTM A403, ASME B16.9 | Pickled, 180G |
| Socket-weld & hose barb fittings | ¼"–4" | ASME B16.11 | Pickled |
Detailed Product Types & Market Info
As one of the largest manufacturers and stocking distributors, we operate a 250-ton/month automated forging and CNC finishing line dedicated to 316 stainless steel fittings. Our 100 000 m² facility keeps 20 000 t of ready stock, ensuring immediate availability for global distributors. Whether you need one box of 316 stainless steel npt fittings or a full container of 316 stainless steel compression fittings, our mill-direct China pricing gives you the competitive edge. Contact our export team today for the most updated quotation and downloadable 3.1 MTC.
Specialty products include complete stainless steel 316 tube fittings – compression, push-in, and weld-in configurations manufactured under DIN 2353 and ISO 8434-1.
316 Stainless Steel Fittings – Premium Quality for Marine and Chemical Applications
Main Applications
- Marine & offshore: seawater cooling, ballast lines, yacht handrails
- Pharmaceutical: WFI, clean steam, sterile vessels
- Food & beverage: CIP circuits, brewery tanks, dairy lines
- Chemical: chloride brines, sulfuric acid dilution, urea plant piping
- Oil & gas: subsea umbilicals, flare tips, riser clamps
- Heat exchangers: shell-and-tube, plate-frame gaskets
- Architecture: coastal curtain walls, swimming-pool canopies
Complete Range: 316 Stainless Steel Threaded Fittings, Compression Fittings & Buttweld Fittings
Why Choose Us – Mill-Direct Advantages
- PED 2014/68/EU, AD2000, ISO 9001 certified mill – EN 10204 3.1 & 3.2 MTC supplied
- 250-ton monthly forging capacity – 5-day lead time for standard items
- Third-party inspection: SGS, TÜV, BV – accepted by European end-users
- In-house polishing & electropolishing – Ra ≤0.4 µm for sanitary grades
- Same-day cutting, beveling, threading – lengths 3–12 m, tolerances ±0.2 mm
- Real-time stock portal – 24/7 visibility for 316 stainless steel npt fittings and 316 stainless steel ball valves sanitary fittings
304 vs 316 vs 304L vs 316L Fittings Comparison
| Grade | Cr % | Ni % | Mo % | Max Cl- ppm | Relative Cost | Best Use |
|---|---|---|---|---|---|---|
| 304 | 18 | 8 | 0 | 200 | 1.0× | General service |
| 304L | 18 | 8 | 0 | 200 | 1.02× | Welded assemblies |
| 316 | 16 | 10 | 2–3 | 1000 | 1.35× | Marine/chloride |
| 316L | 16 | 10 | 2–3 | 1000 | 1.37× | Welded chloride |
FAQ – 316 Stainless Steel Fittings
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What is the price difference between 304 and 316 fittings?
Mill-direct 316 is ~35 % more expensive than 304 due to molybdenum content; our live portal updates daily at 08:00 CST. -
Are your 316 stainless steel ball valves sanitary fittings 3A certified?
Yes, tri-clamp and ball valves carry 3A symbol and FDA compliance – certificate supplied with each batch. -
Compression vs 316 stainless steel npt fittings – which to choose?
Use compression for vibration-free, high-pressure tubing; NPT for general threaded piping. -
Do you stock 316 stainless steel fittings?
Yes, 5 000 t local inventory – same-day pickup or LTL shipping available. -
What is the minimum order quantity?
One carton for stock items; full container (≈20 t) for mill-direct custom forgings. -
How fast can you deliver stainless steel 316 tube fittings?
7 days production + 3–5 days ocean freight to Asian ports; 10 days to EU/US warehouses. -
Which certificates accompany the shipment?
EN 10204 3.1/3.2 MTC, ISO 9001, PED 2014/68/EU, and third-party inspection (SGS/TÜV/BV). -
Do you supply polished or electropolished finishes?
Yes, mirror Ra ≤0.4 µm for sanitary 316 stainless steel ball valves sanitary fittings; EP available on request.
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Stop paying trader margins. Contact the largest 316 stainless steel fittings producer today for the most competitive price, immediate access to stock, and same-day shipping of any 316 stainless steel npt fittings, 316 stainless steel compression fittings, or stainless steel 316 tube fittings.