304/304L Lined Stainless Steel Pipes

Cost-Effective Corrosion Protection: 

Combines low-cost carbon steel base pipe with 304/304L stainless steel lining, reducing material cost by 40-60% compared to solid stainless steel pipe.

Good Corrosion Resistance: 

304/304L internal lining provides excellent resistance to oxidation, fresh water, mild chemicals, and food products. The 304L version offers enhanced intergranular corrosion resistance after welding.

High Mechanical Strength: 

Carbon steel or alloy steel base pipe provides excellent structural strength, pressure ratings, and temperature resistance up to 800°C (1472°F) for base pipe.

Metallurgical/Mechanical Bonding: 

Advanced manufacturing processes ensure strong bond between lining and base pipe, preventing liner collapse or separation during service.

Smooth Internal Surface: 

304/304L lining provides smooth, low-friction surface for improved flow efficiency and reduced fouling in clean service applications.

Weldable End Preparation: 

Available with weld overlay transition (butter layer) at pipe ends for field welding without corrosion exposure at welds.

Full Range of Sizes: 

Available from 2″ to 60″ (DN50 to DN1500) with lining thickness from 2mm to 5mm.

Pressure Ratings: 

Suitable for ANSI Class 150 to Class 2500 pressure ratings based on base pipe selection.

Temperature Range: 

Suitable for -29°C to 400°C (-20°F to 752°F) for lined pipe; base pipe can handle higher temperatures.

International Certifications: 

Lined pipes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with ASTM, ASME, and API standards.

The lower carbon content in 304L lining minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 304, especially in welded service environments.

| Parameter | Seamless Base Pipe | Welded Base Pipe |
| :--- | :--- | :--- | :--- |
| Pipe Size Range | 2″ – 24″ (DN50 – DN600) | 6″ – 60″ (DN150 – DN1500) |
| Base Pipe Wall Thickness | Sch 40 – Sch 160 | Sch 20 – Sch 80 |
| Lining Thickness | 2mm – 5mm | 2mm – 5mm |
| Standard Lengths | 6m, 12m | 6m, 12m |
| End Preparation | Beveled, Weld Overlay | Beveled, Weld Overlay |
| Base Pipe Grades | A106 Gr B, API 5L X42-X65, A333 Gr 6 | A53 Gr B, API 5L X42-X65, AWWA C200 |

l Base Pipe Preparation: Carbon steel base pipe is cleaned, inspected, and prepared for lining application.

l Lining Tube Fabrication: 304/304L stainless steel sheet is rolled and welded into a tube slightly smaller than the base pipe ID.

l Lining Insertion: The 304/304L lining tube is inserted into the base pipe.

l Hydraulic Expansion: High-pressure water (up to 5000 psi) expands the lining tube against the base pipe inner wall, creating a tight mechanical bond.

l Weld Overlay (Butter Layer): Pipe ends are prepared with stainless steel weld overlay (butter layer) using ER308/ER308L filler metal.

l Hydrostatic Testing: Each lined pipe is hydrostatically tested to verify bond integrity and pressure rating.

l NDT Inspection: Ultrasonic testing (UT) and eddy current testing (ECT) verify lining thickness and bond quality.

l End Finishing: Pipe ends are beveled and prepared for field welding.

l Marking & Coating: Pipes are marked with grade, size, lining thickness, heat number, and standard. External coating (epoxy, FBE, 3LPE) applied upon request.

l Base Pipe Inspection: Chemical analysis, mechanical testing, dimensional check per ASTM A106/A53/API 5L.

l Lining Material Verification: PMI 100% for 304/304L lining material – verification of Cr, Ni.

l Bond Integrity Testing: Ultrasonic test (UT) to verify bond between lining and base pipe.

l Lining Thickness Check: Ultrasonic thickness measurement at multiple points.

l Hydrostatic Test: Each pipe tested at 1.5× design pressure.

l Visual Inspection: Internal and external surface inspection.

l Dimensional Check: OD, ID, wall thickness, length, straightness.

l Intergranular Corrosion Test: ASTM A262 Practice E for 304L lining (upon request).

l Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available upon customer request.

l Water Treatment: Potable water distribution, wastewater treatment lines, filtration system piping, reverse osmosis feed lines.

l Food & Beverage Processing: Dairy product lines, brewery piping, food ingredient transfer, CIP supply lines, beverage processing.

l Pharmaceutical Manufacturing: High-purity water lines, WFI distribution, clean steam lines, process water lines (electropolished lining option).

l Chemical Processing (Mild): Non-chloride chemical transfer, organic chemical lines, solvent piping, neutralization lines.

l General Industrial: Compressed air lines, cooling water systems, HVAC piping, plant utility water.

l Agricultural & Irrigation: Fertilizer injection lines, irrigation water distribution, livestock water supply.

l HVAC Systems: Chilled water lines, condenser water lines, heating water distribution.

l Power Generation (Auxiliary): Cooling water lines, service water systems, auxiliary plant piping.

1. When should I choose 304/304L lined pipe instead of 316/316L?
Choose 304/304L lined pipe for fresh water, food processing, pharmaceutical, and mild chemical applications where chloride exposure is minimal. For seawater, brackish water, or high-chloride environments, 316/316L lined pipe is recommended.

2. Can 304 lined pipes be used for potable water service?
Yes, 304/304L stainless steel is approved for potable water service in many countries. The smooth internal surface also resists biofilm formation.

3. What is the maximum temperature for 304L lined pipes?
400°C (752°F) for lined pipe service. Base pipe can handle higher temperatures, but the lining may be affected above 400°C.

4. Are 304 lined pipes suitable for food processing applications?
Yes, 304/304L is widely used in food processing due to its good corrosion resistance and cleanability. Electropolished lining option is available for enhanced cleanability.

5. Can 304 lined pipes be used for seawater service?
No, 304/304L is not recommended for seawater or high-chloride environments. For seawater service, use 316/316L or duplex lined pipes.

6. What is the standard lining thickness for water service?
2.5mm to 3mm lining thickness is standard for water service applications, providing adequate corrosion protection with cost optimization.

l Most Economical Option: Lowest cost lined pipe solution for general corrosive service

l Complete Size Range: 2″ to 60″ (DN50 to DN1500) – all standard sizes available

l Multiple Base Pipe Grades: A106 Gr B, API 5L X42-X65, A333 Gr 6, AWWA C200

l Lining Thickness Options: 2mm to 5mm – tailored to your service requirements

l Weld Overlay Ready: Pipe ends prepared with 308/308L stainless steel butter layer for field welding

l Full Traceability: Heat number on each pipe – traceable to original mill certificate

l Potable Water Approved: Suitable for drinking water applications

l Food Grade Available: Electropolished lining option for food and pharmaceutical service

l Marine Certified: ABS, BV, DNV, LR certifications available for marine auxiliary systems

l Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available

l Global Delivery: Exported to major water treatment, food processing, and industrial projects worldwide

Website: www.womicstainless.com

E-mail: info@womicstainless.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel – Your reliable partner for high‑quality stainless steel products, precision machined components, and custom solutions for corrosion‑resistant applications.

Stock Examples (304L Lined Pipes – A106 Gr B Base – 3mm Lining – Weld Overlay Ends):

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