316L Stainless Steel Pipe
AISI 316L (UNS S31603) is a low-carbon, molybdenum-bearing austenitic stainless steel pipe offering superior corrosion resistance in chloride and marine environments. OD 6-610mm, WT 0.5-40mm. Supplied with EN 10204 3.1 MTC.
| Material | Austenitic Stainless Steel |
|---|---|
| Grade / Standard | AISI 316L / UNS S31603 |
| Outer Diameter (OD) | 6mm - 610mm (NPS 1/8 inch - NPS 24 inch) |
| Wall Thickness (WT) | 0.5mm - 40mm (SCH 5S / 10S / 40S / 80S / 160S) |
| Length | 3m / 6m / 12m (or cut to length) |
| Delivery Condition | hot_rolled / cold_rolled |
| Surface Treatment | bare / polished / coated |
| MOQ | 1 Ton |
| Delivery Time | 10-25 Days / In Stock |
| Loading Port | Tianjin / Shanghai / Qingdao |
Overview of 316L Stainless Steel Pipe
AISI 316L is the second most common austenitic stainless steel grade, distinguished by the addition of 2% to 3% molybdenum and a low carbon content (maximum 0.030%). Specified under ASTM A312 / ASTM A213 / ASTM A269 standards with UNS designation S31603, 316L stainless steel pipe provides exceptional resistance to pitting and crevice corrosion, particularly in chloride and acidic environments. The “L” designation indicates low carbon, which minimizes harmful carbide precipitation during welding, ensuring optimal corrosion resistance in the as-welded condition without the need for post-weld annealing. Containing nominally 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, this grade is universally recognized as the standard “marine grade” stainless steel.
316L stainless steel pipe is manufactured in seamless forms (cold-drawn or hot-extruded) for high-pressure chemical and offshore applications, and welded forms (ERW, TIG, or laser-welded) for high-volume process piping. It outperforms 304 stainless steel in harsh environments, making it the premier choice for chemical processing, oil and gas extraction, pharmaceutical manufacturing, and marine applications. While bearing a higher initial cost than 304, 316L provides a superior lifecycle value in corrosive environments, minimizing maintenance downtime and extending the service life of critical fluid handling infrastructure.
Key Features and Manufacturing Methods
316L stainless steel pipe is engineered to meet the stringent demands of aggressive industrial environments. Seamless pipes (per ASTM A312/A213) are produced from solid S31603 billets, offering a homogeneous microstructure, superior pressure ratings (often exceeding 1500 psi depending on wall thickness), and elimination of weld-seam vulnerabilities. Welded pipes are formed from premium cold-rolled coils, employing advanced automated welding techniques, followed by rigorous bead working and solution annealing to ensure the weld zone matches the base metal’s corrosion resistance.
Available in an extensive outer diameter range from 6mm to 610mm with wall thicknesses from 0.5mm to 40mm, the pipes are supplied in standard lengths of 3m, 6m, and 12m. Surface finishes range from standard mill finish and pickled (for industrial use) to highly polished No.4 and electropolished interior finishes (Ra < 0.4µm) specifically tailored for pharmaceutical WFI (Water for Injection) systems. Every 316L pipe undergoes comprehensive quality control, including chemical analysis (verifying Molybdenum and low Carbon levels), mandatory hydrostatic or eddy current testing, tensile and yield strength verification, and intergranular corrosion testing (ASTM A262 Practice E) to guarantee peak performance in severe service conditions.
Main Applications of 316L Stainless Steel Pipe
Due to its superior corrosion resistance, 316L stainless steel pipe is the standard material for the chemical and petrochemical industries. It is heavily utilized for piping systems handling sulfuric acid, acetic acid, formic acid, tartaric acid, photographic chemicals, and various chloride-bearing solutions at high temperatures. In the marine and offshore sectors, 316L pipe is indispensable for shipboard piping, offshore oil platform process lines, coastal desalination plants, and underwater equipment where resistance to seawater pitting and salt spray is critical.
The pharmaceutical, biotechnology, and semiconductor industries rely on electropolished 316L pipe for ultra-pure water systems, sterile gas distribution, and sanitary process piping, as its stable passive layer prevents product contamination and withstands aggressive SIP (Steam-In-Place) and CIP (Clean-In-Place) chemicals. Furthermore, the pulp and paper industry uses 316L for chemical recovery and bleaching equipment. Other vital applications include wastewater treatment plants, medical implants and surgical facility utility lines, commercial brewing systems, and high-end architectural applications in coastal environments where 304 would quickly succumb to tea-staining and surface rust.
Why Choose Us for 316L Stainless Steel Pipe
Shandong Tanglu Metal Material Co., Ltd. is a premier supplier of high-grade 316L stainless steel pipe, partnering with top-tier Chinese mills certified to ISO 9001, ASME, PED 2014/68/EU, and marine classification society standards. We strictly guarantee the chemical composition of our 316L products, ensuring Molybdenum content is robustly between 2.0-3.0% and Carbon is strictly ≤0.030%. Every batch is subjected to rigorous testing, including PMI (Positive Material Identification), intergranular corrosion tests, and mandatory NDT (hydrostatic/eddy current), ensuring absolute reliability for high-risk chemical and marine projects.
We maintain a comprehensive inventory covering OD 6mm to 610mm and schedules from SCH 5S to SCH 160S, allowing for rapid deployment to global markets. With a monthly supply capacity of 3,000 tons, we adeptly handle both urgent maintenance shutdowns and massive capital project procurements. Our export logistics team ensures pipes are securely packaged with marine-grade protection for global transit. Every shipment is accompanied by full traceability and an EN 10204 3.1 Mill Test Certificate, with EN 10204 3.2 and third-party inspection (SGS, DNV, BV, LR, ABS) readily available to meet your project’s strict compliance requirements.
📐 Dimension & Size Table
| OD (inch / mm) | WT SCH 10S (mm) | WT SCH 40S (mm) | WT SCH 80S (mm) |
|---|---|---|---|
| 1/8" (10.3mm) | 1.24 | 1.73 | 2.41 |
| 1/4" (13.7mm) | 1.65 | 2.24 | 3.02 |
| 1/2" (21.3mm) | 2.11 | 2.77 | 3.73 |
| 3/4" (26.7mm) | 2.11 | 2.87 | 3.91 |
| 1" (33.4mm) | 2.77 | 3.38 | 4.55 |
| 1-1/2" (48.3mm) | 2.77 | 3.68 | 5.08 |
| 2" (60.3mm) | 2.77 | 3.91 | 5.54 |
| 2-1/2" (73.0mm) | 3.05 | 5.16 | 7.01 |
| 3" (88.9mm) | 3.05 | 5.49 | 7.62 |
| 4" (114.3mm) | 3.05 | 6.02 | 8.56 |
| 6" (168.3mm) | 3.40 | 7.11 | 10.97 |
| 8" (219.1mm) | 3.76 | 8.18 | 12.70 |
| 10" (273.0mm) | 4.19 | 9.27 | 15.09 |
| 12" (323.8mm) | 4.57 | 10.31 | 17.48 |
| 14" (355.6mm) | 4.78 | 11.13 | 19.05 |
| 16" (406.4mm) | 4.78 | 12.70 | 21.44 |
| 18" (457.0mm) | 4.78 | 14.27 | 23.83 |
| 20" (508.0mm) | 5.54 | 15.09 | 26.19 |
| 24" (610.0mm) | 6.35 | 17.48 | 30.96 |
* Custom sizes available upon request. Tolerances per relevant international standards.
🔬 Chemical Composition
| Element | Min | Max | Display Value | Note |
|---|---|---|---|---|
| C | - | 0.030 | ≤0.030 | Low carbon ensures weldability (ASTM A312 TP316L) |
| Si | - | 0.75 | ≤0.75 | |
| Mn | - | 2.00 | ≤2.00 | |
| P | - | 0.045 | ≤0.045 | |
| S | - | 0.030 | ≤0.030 | |
| Cr | 16.00 | 18.00 | 16.00-18.00 | Primary corrosion resistance |
| Ni | 10.00 | 14.00 | 10.00-14.00 | Austenite stabilizer, higher than 304 |
| Mo | 2.00 | 3.00 | 2.00-3.00 | Key element for chloride/pitting resistance |
| N | - | 0.10 | ≤0.10 | Optional |
| Fe | - | - | Balance | Base element |
* Chemical composition may vary by heat, thickness and specification. Please refer to the actual mill test certificate.
⚙️ Mechanical Properties
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥485 | MPa | Solution annealed, per ASTM A312 |
| Yield Strength (Rp0.2) | ≥170 | MPa | 0.2% proof stress |
| Elongation (A) | ≥35 | % | Gauge length 50mm |
| Brinell Hardness (HBW) | ≤192 | HBW | Solution annealed |
| Rockwell Hardness (HRB) | ≤90 | HRB | Solution annealed |
| Hydrostatic Test | Pass | - | Mandatory per ASTM A312 |
| Eddy Current Test | Pass | - | Alternative to hydrostatic test |
| Intergranular Corrosion | Pass | - | Per ASTM A262 Practice E |
| Density | 7.98 | g/cm³ | Reference value (Heavier than 304 due to Mo) |
| Magnetic Permeability | ≤1.02 | μ | Non-magnetic austenitic (may show slight magnetism when work-hardened) |
* Values shown are minimum requirements unless otherwise stated.
📦 Commercial Information
| Packaging | Standard seaworthy export packing designed for premium stainless steel pipes. Pipes are bundled in hexagonal formations with heavy-duty steel strapping and nylon slings to prevent surface marring. Plastic caps are securely fitted on both ends to prevent internal contamination and edge damage. Heat number, grade (316L / TP316L), OD, WT, and length are stenciled on the pipe and detailed on weather-resistant metal tags. For pharmaceutical-grade electropolished pipes or high-polish decorative pipes, each piece is individually sleeved in protective PVC film or wooden crated to guarantee a pristine surface upon arrival. |
|---|---|
| Payment Terms | T/T (Telegraphic Transfer),L/C (Letter of Credit),D/P (Documents against Payment),Western Union,PayPal |
| Price Term | FOB,CFR,CIF,EXW |
| Supply Capacity | 3,000 Tons/Month (Stainless Steel Pipes) |
| Loading Port | Tianjin / Shanghai / Qingdao |
Why Choose Our 316L Stainless Steel Pipe?
Marine Grade Chloride Resistance
Alloyed with 2-3% Molybdenum, our 316L pipe provides exceptional resistance to pitting and crevice corrosion in chloride-rich environments, making it the definitive choice for offshore platforms, shipboard piping, and coastal infrastructure.
Excellent Weldability (Low Carbon)
With carbon content strictly controlled to ≤0.030%, 316L prevents carbide precipitation (sensitization) at grain boundaries during welding. This allows for heavy-gauge field welding without the need for post-weld solution annealing.
Strict Quality Assurance & Testing
Every 316L pipe undergoes mandatory 100% hydrostatic or non-destructive eddy current testing per ASTM A312, accompanied by PMI chemical verification and intergranular corrosion testing to ensure complete reliability in critical pressure systems.
Pharmaceutical & Chemical Compliant
Fully compliant with stringent industry standards including ASME BPE for pharmaceutical sanitary tubing (electropolished available) and NACE MR0175/ISO 15156 for sour service in the oil and gas sector.
Extensive Stock & Global Logistics
We maintain a massive stock of standard SCH 10S, 40S, and 80S 316L pipes from NPS 1/2" to NPS 12" for rapid dispatch (7-15 days). Container loading is expertly handled to ensure materials reach global destinations perfectly intact.
🏭 Applications of 316L Stainless Steel Pipe
316L stainless steel pipe is the premier material choice for industries operating in highly corrosive, chloride-rich, or high-purity environments. In the Chemical and Petrochemical sectors, it is utilized for processing lines handling corrosive acids, alkalis, and complex chemical streams where standard 304 would fail due to pitting. The Marine and Offshore industries rely heavily on 316L for structural piping, ballast systems, desalination plants, and splash-zone components due to its resistance to seawater corrosion. In the Pharmaceutical, Biotechnology, and Food & Beverage industries, 316L is the gold standard for sanitary piping; its stable passive layer and electropolishing compatibility make it ideal for Water for Injection (WFI) systems, sterile fluid transfer, and clean-in-place (CIP) networks. The Pulp and Paper industry utilizes 316L to withstand harsh bleaching chemicals. Additionally, it is heavily specified in Water Treatment facilities handling chlorinated water, Medical Device manufacturing, and high-end Architectural projects situated in salt-spray coastal zones, ensuring a pristine appearance and structural integrity for decades.
📋 Quality & Certification
Our Certifications
- ✅ ISO 9001:2015
- ✅ ABS
- ✅ DNV GL
- ✅ Lloyd's Register (LR)
- ✅ Bureau Veritas (BV)
- ✅ SGS Certified
Mill Certificate Type
- 📋 EN 10204 3.1
- 📋 EN 10204 3.2
- 📋 Original Mill Certificate
- 📋 Third Party Inspection Available
- 📋 Certificate of Origin
❓ Frequently Asked Questions
What makes 316L stainless steel pipe different from 304?
The primary difference is the chemical composition. 316L contains 2% to 3% Molybdenum (Mo) and a slightly higher Nickel content, whereas 304 contains no Molybdenum. This addition gives 316L significantly enhanced resistance to pitting and crevice corrosion, especially in environments containing chlorides (like salt water, de-icing salts, or certain cleaning chemicals). Additionally, 316L has a low carbon content (≤0.030%), whereas standard 304 has up to 0.08%. This makes 316L much better suited for marine, heavy chemical, and high-chloride applications, justifying its higher cost compared to 304.
Why is the "L" (Low Carbon) important in 316L pipe?
The "L" stands for Low Carbon (maximum 0.030%). When standard stainless steel (like 316 with 0.08% carbon) is welded, the extreme heat can cause carbon to bond with chromium at the grain boundaries, a process called carbide precipitation or sensitization. This depletes the surrounding area of chromium, leading to localized intergranular corrosion. The severely restricted carbon content in 316L prevents this phenomenon, allowing the pipe to be welded without losing its corrosion resistance in the heat-affected zone, and eliminating the need for expensive post-weld solution annealing.
Should I choose seamless or welded 316L stainless steel pipe?
The choice depends on your operating pressure, application, and budget. Seamless 316L pipe (extruded from a solid billet) has no weld seam, giving it a higher pressure rating, perfectly uniform strength, and making it the required standard for critical high-pressure chemical processes, deep-sea offshore applications, and oil refineries. Welded 316L pipe is produced by rolling and welding metal strips. Advances in welding technology mean modern welded pipe is highly reliable and significantly more cost-effective. Welded pipe is frequently used in pharmaceutical plants, food processing, water treatment, and general chemical transfer where pressures are moderate.
Is 316L stainless steel pipe completely rust-proof in seawater?
While 316L is known as the "marine grade" stainless steel and performs vastly better than 304 in seawater, it is not 100% immune to corrosion under all circumstances. In moving/flowing seawater, 316L performs exceptionally well because the flow keeps the protective oxide layer oxygenated. However, in stagnant, warm seawater or in tight crevices (like under gaskets or marine growth), oxygen is depleted, and the chloride can break down the passive layer, leading to pitting corrosion over time. Regular cleaning or specifying higher-alloy materials (like Duplex 2205 or Super Austenitic 254 SMO) is recommended for permanently submerged, stagnant marine applications.
What is the pressure rating of a 316L stainless steel pipe?
The pressure rating of a 316L pipe depends heavily on its outer diameter (OD), wall thickness (Schedule), and operating temperature. For example, a 2-inch NPS Schedule 40 seamless 316L pipe operating at room temperature can safely handle over 1,500 psi. However, as the temperature increases, the allowable pressure decreases. Pressure ratings must be calculated using standard engineering codes such as ASME B31.3 for process piping. We provide comprehensive mill test certificates and dimensional accuracy ensuring our pipes meet the required strength parameters for your engineering calculations.
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316L Stainless Steel Pipe
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