Our large diameter thick wall 316 seamless stainless steel pipe is specially designed and manufactured for global marine engineering projects. Adopt one-time hot rolling seamless forming technology without welding seam, grade 316 stainless steel with high molybdenum content, excellent seawater corrosion, chloride ion and salt fog resistance. Widely applied for ship pipeline, offshore platform, coastal engineering, marine desalination equipment and ocean hydraulic transmission system. We support full customization on outer diameter, wall thickness, length and surface treatment, factory wholesale without middleman markup.
Specification
| Specification Item | Parameters & Standard Description |
| Production Name | Large Diameter Thick Wall 316 Seamless Stainless Steel Pipe for Marine Engineering |
| Steel Grade | Stainless Steel 316 / UNS S31600 |
| Executive Manufacturing Standards | ASTM A312, ASTM A249, EN 10216-5, GB/T 14976 Marine Special Standard |
| Production Craft | Hot Rolled Seamless, Cold Drawn Seamless (small tolerance customization) |
| Outer Diameter (Large Diameter Range) | 108mm – 1220mm customized large diameter; Custom OD sizes acceptable as customer drawing |
| Wall Thickness (Thick Wall Series) | 6mm – 80mm heavy thick wall; Super thick wall pipe available for ultra-high pressure marine pipeline |
| Available Length | Fixed length 3m / 6m / 12m, random length, cutting to required length per marine project drawing |
| Surface Treatment | Pickled White Finish, Bright Annealed, Sand Blasted Anti-salt-fog Surface for marine use |
| Tolerance Standard | OD tolerance ±0.5%, Wall thickness tolerance ±5%, Length tolerance +10/-0mm |
| Mechanical Property | Tensile Strength ≥485MPa, Yield Strength ≥170MPa, Elongation ≥40%, high toughness for ocean vibration environment |
| Corrosion Test | Neutral Salt Spray Test ≥1000 hours, anti chloride ion erosion, suitable coastal & offshore marine environment |
Main Marine Engineering Application
| Application Field | Detailed Usage Description |
| Offshore Oil & Gas Platform | Main fluid transmission pipeline, cooling water pipeline, chemical medium conveying thick wall seamless pipe |
| Shipbuilding & Vessel Project | Ballast water pipeline, seawater cooling system, hydraulic pipeline, marine exhaust auxiliary pipe |
| Coastal Marine Infrastructure | Seawater desalination plant pipeline, coastal dock water supply & drainage pipeline, tidal power station pipeline |
| Ocean Engineering Equipment | Marine underwater detection equipment pipeline, offshore wind power supporting fluid pipeline, ocean chemical delivery pipe |
| Other Marine Heavy Industry | Marine chemical storage matching pipeline, ship repair factory supporting thick wall stainless pipe |
Packaging, Shipping & After-sales Service
| Service Module | Description |
| Export Marine Packaging | Waterproof plastic film wrapped, wooden pallet packing, seaworthy export wooden case, anti-rust paper inside to avoid salt fog damage during ocean transportation |
| Global Shipping Support | Support FOB, CIF, CFR, DDP trade terms; Cooperate with major global shipping lines, deliver to all main marine engineering ports worldwide |
| QC Inspection Service | 100% hydrostatic pressure test, eddy current flaw detection, chemical composition spectrum test before shipment; Provide full inspection report for marine project acceptance |
| Custom Deep Processing | Pipe cutting, threading, bending, flange welding, polishing, drilling deep processing according to marine engineering drawing |
| After-sales Support | 24-hour online technical engineer support for marine pipeline matching scheme; Quality compensation for non-conforming products caused by factory production |
| MOQ & Sample Policy | Small MOQ acceptable for marine engineering trial order; Provide free small sample, buyer only bear express freight |
Products Description
Q: Q1: Why choose 316 seamless stainless steel pipe for marine engineering instead of 304?
A: A1: Grade 316 contains molybdenum element, which greatly improves resistance to chloride ion corrosion. Marine environment is full of seawater and salt fog; 304 steel will rust rapidly under long-term seawater contact, while 316 can stably serve marine projects for over 20 years.
Q: Q2: What is the maximum outer diameter and thick wall you can produce?
A: A2: Our factory can produce large diameter seamless pipe OD from 108mm to 1220mm, thick wall thickness up to 80mm. Super large & extra thick wall sizes can be customized based on your marine engineering drawing.
Q: Q3: Is your seamless pipe fully compliant with international marine industry standards?
A: A3: Yes. Our 316 seamless stainless pipe is produced following ASTM A312 and EN marine standards, complete with material test certificate, salt spray test report and factory inspection certificate for offshore project bidding.
Q: Q4: Can you cut and process the pipe to match my marine pipeline system?
A: A4: We provide one-stop deep processing service including cutting, bending, threading, polishing and flange assembly. We support customized machining according to your engineering construction drawing.
Q: Q5: How to guarantee the pipes will not rust during sea transportation?
A: A5: We adopt pickling passivation anti-corrosion treatment for pipe surface, wrap anti-rust paper and waterproof plastic film, then pack with seaworthy wooden pallets/cases to isolate salt fog during long ocean transit.
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