High-Performance 316/316L Stainless Steel Pipe Fittings for Industrial and Marine Applications

Corrosion Resistance: Excellent resistance to pitting and crevice corrosion in chloride-containing environments, seawater, and aggressive chemical media.

Weldability and Formability: The low carbon content of 316L prevents intergranular corrosion after welding; fittings are available in butt-weld (BW), socket-weld (SW), and threaded (NPT) connections.

Full Range of Types: Elbows (45°/90°/180°), tees (equal/reducing), reducers (concentric/eccentric), caps, stub ends, crosses, and nipples.

Mechanical Strength: High tensile and yield strength combined with good ductility, suitable for high-pressure pipelines and critical structural joints.

International Certifications: Fittings can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK standards for offshore projects.

Womic Steel produces stainless steel pipe fittings in strict accordance with the following international standards, ensuring global acceptance and compliance:

These standards guarantee that our 316/316L stainless steel pipe fittings meet global requirements for chemical composition, mechanical properties, dimensional tolerances, and testing methods.

The lower carbon content in 316L minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 316, especially in high-temperature or welded service environments.

Heat Treatment Condition:
All fittings are solution annealed at 1040–1080°C followed by rapid cooling (water quenching). This treatment restores full corrosion resistance, relieves internal stresses, and enhances ductility, ensuring reliable performance in demanding chemical, marine, and offshore applications.

For ASME B16.9 butt-weld fittings, pressure ratings follow the corresponding pipe schedule. For ASME 

B16.11 socket-weld and threaded fittings, the ratings are as follows (based on ASME B16.11):

*Note: Ratings are for 316/316L stainless steel. De-rating factors apply for higher temperatures. Always consult detailed ASME B16.34/ B16.5 tables for critical applications.*

We offer a complete range of fitting types in both seamless and welded construction. Custom materials (duplex, super duplex, nickel alloys) are also available upon request.

Additional available materials (custom order):

Duplex & Super Duplex: S31803, S32205, S32750 (2507), S32760

Nickel Alloys: Inconel 600/625, Incoloy 800/825, Hastelloy C276

Other Austenitic Grades: 304/304L, 321, 347, 317L

Womic Steel supplies a full range of sizes to meet everything from instrument tubing to main process piping.

Length: According to ASME B16.9 standard dimensions or customer drawing.

Delivery Condition: Normally solution annealed and pickled, or mechanically polished.

Raw Material Selection: High-quality 316/316L seamless pipes or billets from certified mills (Baosteel, TISCO, POSCO).

Cutting & Heating: Cut to exact volume and induction-heated to plastic forming temperature.

Forming: Hot extruded using hydraulic presses or mandrel push machines (push elbow, drawn tee).

Shaping & Sizing: Calibrated in dies to ensure accurate angle, radius, and uniform wall thickness.

Solution Annealing: Heat treated at 1050–1080°C followed by rapid water quenching to restore corrosion resistance.

End Finishing: Beveling (for butt-weld ends) or threading / socket boring (for SW/threaded fittings).

Pickling & Passivation: Removes oxide scale and creates a passive film on the surface.

Marking & Inspection: Laser/inkjet marked with grade, heat number, size, and standard.

Plate Cutting: 316/316L steel plates cut into sectors or approximations.

Forming: Hot pressed into half-shells.

Assembly & Welding: Half-shells assembled and welded (SAW or TIG) along longitudinal and circumferential seams.

Weld Treatment: Internal and external weld beads ground smooth; radiographic inspection performed.

Heat treatment & subsequent steps as above.

Womic Steel offers a variety of surface finishes for 316/316L stainless steel fittings to meet different industrial, sanitary, and aesthetic requirements:

Every batch of 316/316L stainless steel pipe fittings undergoes strict quality control before shipment:

Chemical Analysis: Spectrometer or PMI (Positive Material Identification) 100% verification of alloy elements.

Mechanical Testing: Tensile, yield, elongation, hardness (per ASTM A370).

Dimensional Inspection: Go/no-go gauges, CMM, angle/wall thickness special tools.

Non-Destructive Testing (NDT):

100% Penetrant Testing (PT) for surface defects.

Ultrasonic Testing (UT) or Radiographic Testing (RT) for internal defects (upon customer request).

Hydrostatic / Pneumatic Testing: According to ASME B16.9 appendix or customer specification.

Intergranular Corrosion Test: Per ASTM A262 Practice E to verify resistance to sensitization.

Third-Party Inspection: SGS, BV, TUV surveillance available upon request.

Chemical & Petrochemical Industry: Acid-resistant piping systems, reactor connections.

Marine & Offshore: Seawater desalination, ballast lines, oil rig platforms (with ABS/DNV/LR certification).

Food & Beverage: Sanitary pipelines, dairy processing, brewing systems.

Pharmaceutical Equipment: Sterile and clean piping for drug manufacturing.

Heat Exchangers & Boilers: High-temperature and high-pressure connections.

Water Treatment: Reverse osmosis, high-purity water distribution.

Construction & Decoration: Handrails, structural supports, architectural stainless steel piping.

Every 316/316L stainless steel pipe fitting is cleaned, labeled, and securely packed to ensure safe transportation worldwide.

Standard Packaging:

Small bore fittings (≤2″): Cartons or woven bags with moisture-proof film inside.

Large bore fittings (≥2.5″): Wooden pallets + stretch film, or custom steel frames / wooden crates.

End Protection: Plastic caps for all butt-weld ends; thread protectors for threaded ends.

Labeling: Each fitting has a sticker (material, heat number, size) plus waterproof shipping marks.

Womic Steel’s Delivery Strengths:

Ready Stock: Common sizes (1/2″–12″ Sch10S/Sch40S) in stock over 5,000 tons – ready for dispatch within 24 hours.

Direct Shipping Cooperation: Partnerships with global shipowners for the most competitive freight rates.

Professional Loading: In-house loading teams ensure fittings are tightly secured to avoid damage.

Fast Customs Clearance: Professional documentation team prepares full certificates of origin, quality documents, and packing lists in advance.

Full Tracking: Real-time vessel tracking and destination agent support after shipment.

1. What is the difference between 316 and 316L stainless steel pipe fittings?
The main difference is carbon content. 316L has lower carbon (≤0.03%) which prevents carbide precipitation during welding, making it more resistant to intergranular corrosion. For most welded applications, 316L is preferred.

2. Can you provide fittings with special bevels or non-standard dimensions?
Yes. Womic Steel offers full customization – special bevel angles, short/long patterns, and custom wall thicknesses. Contact us with your drawing or specification.

3. Do you provide material test reports (MTR) and third-party inspection?
Yes. Every shipment includes EN 10204 3.1 MTR (mill test certificate). Third-party inspection by SGS, BV, DNV, or TUV can be arranged at customer request.

4. What is the typical lead time for 316/316L stainless steel fittings?
Stock sizes: 1–3 days. Custom sizes/ non-standard materials: 2–4 weeks depending on quantity and complexity.

5. Are your fittings suitable for offshore / marine applications?
Absolutely. Our 316/316L fittings offer excellent seawater corrosion resistance. We can supply fittings with ABS, DNV, LR, BV, and other classification society certificates.

6. What is the maximum pressure rating for socket weld fittings in 316L?
For 3000LB class socket weld fittings, the maximum pressure rating at ambient temperature is approximately 2085 psig. For 6000LB, it is 4170 psig. Always refer to ASME B16.11 for exact de-rating at elevated temperatures.

Complete Product Range: Butt-weld, socket-weld, and threaded fittings – one-stop purchasing.

Strict Quality Control: ISO 9001, PED 2014/68/EU, and API Q1 certified.

Advanced Production Lines: Multiple fully automatic hydraulic push lines and CNC machining centers.

Full Traceability: From heat number to finished fitting – traceable back to raw material.

Flexible Customization: Non-standard sizes, special bevels, exotic materials (duplex / nickel alloys) available.

Global Delivery: Exported to over 50 countries including Middle East, Southeast Asia, Europe, and South America.

 Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on 316/316L stainless steel pipe fittings. We offer certified quality, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.

Common Stock Sizes (Examples):

90° LR Elbow: 1/2″ Sch40S, 3/4″ Sch40S, 1″ Sch10S, 2″ Sch10S, 3″ Sch40S, 4″ Sch80S, 6″ Sch40S, 8″ Sch10S, 12″ Sch40S

Equal Tee: 2″ × 2″ Sch40S, 4″ × 4″ Sch10S, 6″ × 6″ Sch80S

Concentric Reducer: 4″ × 2″ Sch40S, 6″ × 4″ Sch10S, 8″ × 6″ Sch40S

Cap: 6″ Sch40S, 8″ Sch40S, 10″ STD

Stub End: 2″ Sch10S long type, 4″ Sch10S long type

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Nominal Size Cross Reference:

1/2″ (DN15) · 3/4″ (DN20) · 1″ (DN25) · 1 1/4″ (DN32) · 1 1/2″ (DN40) · 2″ (DN50) · 2 1/2″ (DN65) · 3″ (DN80) · 4″ (DN100) · 5″ (DN125) · 6″ (DN150) · 8″ (DN200) · 10″ (DN250) · 12″ (DN300) · 14″–48″ custom made