309S Stainless Steel Ferrules
309S Stainless Steel Ferrules - industrial steel pipe
180°–200° U outer half round boiler tube shields, targeted outer arc anti-abrasion design, snap ring or welding installation, full custom sizes & heat-resistant stainless materials.
U-Type Outer Half-Round Tube Shield is a customized special arc protective sleeve developed for boiler U-bend and return bend heat exchange tubes. The outer curved part of boiler elbow bears the strongest impact of high-speed flue gas, abrasive fly ash particles and corrosive condensate, which easily causes tube wall thinning, pitting corrosion and thermal fatigue cracking, leading to frequent boiler shutdown for maintenance.
This product adopts integrated hydraulic stamping to form 180° to 200° U-shaped half round structure, only covering the erosion-prone outer arc of the bend, which saves alloy raw materials compared with full-circle tube shields and retains better heat exchange efficiency. Multiple martensitic, ferritic and austenitic heat-resistant stainless steel grades are available to match different boiler flue temperature and sulfur content working conditions.
Two mature installation solutions of snap ring clamping and spot welding are supported, and matched same-alloy C/U snap lock fasteners are supplied together. It is widely matched with straight half round tube shields, inner U-type shields and wave fin baffles to form a complete boiler tube anti-abrasion protection system for thermal power, CFB and biomass incineration boilers.
U-Type Outer Half-Round Tube Shield is a targeted anti-wear component for boiler elbow outer arc, with unique structural design and diversified material options, cooperating with three categories of tube protection solutions to cover all heating surface zones:
180°–200° single-side U arc structure, only wraps the outer erosion surface of U-bends, targeted protection reduces material cost significantly. Integrated stamping without splicing gaps avoids ash accumulation and concentrated abrasion; reserved edge structure for snap ring or welding fixing, no sliding under long-term flue vibration. Applicable to superheater, reheater and economizer bend sections with medium and heavy fly ash impact.
Complete set of matched protective parts including inner U-type tube shields (protect bend inner radius), straight half round tube shields for straight tube bundles, wave fin inter-tube anti-wear baffles for fin transition abrasion zones, forming full pipeline bend & straight tube protection system.
For ultra-severe high-sulfur flue working conditions, we provide on-site laser cladding service on the surface of U outer tube shields to form Cr3C2 composite anti-abrasion coating and further extend service life.
| Alloy Grade | Material Type | Max Continuous Temp | Main Application Boiler Zone |
|---|---|---|---|
| 410 / 420 | Martensitic Stainless | ≤600°C | Low-sulfur economizer U-bends, low cost routine projects |
| 430 | Ferritic Stainless | ≤815°C | Clean gas boiler low-sulfur flue bends |
| 304 / 316L / TP321 | Austenitic Stainless | ≤750°C | Medium temp secondary superheater bends |
| 309S / 310S / Inconel | High Temp Austenitic | 850–1150°C | Furnace arch, high temp superheater high sulfur bends |
Material Selection Tip: Low-temperature low-sulfur economizer bends select 410/420 to control cost; furnace high-temperature high-sulfur U-bends must adopt 309S or 310S grade U outer tube shields.
| Matching Tube Outer OD (mm) | Alloy Plate Thickness (mm) | Single Shield Length (mm) | Recommended Material Grade |
|---|---|---|---|
| 12 / 22 / 32 / 38 | 1.5 / 2.0 | 50 ~ 800 | 410 / 430 / 304 |
| 42 / 51 / 57 / 60 | 2.0 / 3.0 / 4.0 | 100 ~ 1200 | 420 / 316L / 309S |
| 76 / 89 / 108 / 127 | 4.0 / 5.0 / 6.0 | 200 ~ 1500 | 309S / 310S / Inconel |
Note: Extra thick anti-abrasion plate, special bend radius and non-standard length can be customized by opening exclusive stamping molds based on customer boiler coil drawings.
All snap lock fasteners adopt identical alloy material as tube shield, eliminate electrochemical corrosion risk under long-term high-temperature sulfur-containing flue environment.
| Matching Product | Core Function | Application Position |
|---|---|---|
| U-Type Outer Half-Round Tube Shield | Protect U-bend outer erosion arc | Superheater / economizer return bend outer surface |
| Inner U-Type Tube Shield | Protect bend inner radius from scaling & corrosion | Low-flow inner curve of boiler elbow |
| Straight Half Round Tube Shield | Straight heat exchange tube outer protection | Horizontal vertical straight tube bundles |
| C/U Alloy Snap Fasteners | Non-weld fixed accessory for all U/half shields | All tube shield installation scenes |
U-Type Outer Half-Round Tube Shields are widely applied for all industrial boilers with U-shaped heat exchange coil erosion problems:
Core protection positions: Superheater U-bends, reheater return bends, economizer curved tubes, fin transition outer bend zones with concentrated ash flow impact.
| Alloy Grade | Max Working Temp | Sulfur Resistance | Abrasion Capacity | Raw Material Cost |
|---|---|---|---|---|
| 410 / 420 | ≤600°C | Low sulfur only | Medium | Lowest |
| 430 | ≤815°C | Low sulfur clean flue | General | Low-Medium |
| 304 / 316L | ≤750°C | Medium sulfur | Medium | Medium |
| 309S / 310S | 850–1150°C | High sulfur tolerance | Good | High |
Standard operation specifications for U outer half round tube shield installation and long-term service maintenance:
1. Handling reminder: Avoid violent knocking during transportation and hoisting, prevent invisible stamping microcracks on U arc surface.
2. Welding rule: Martensitic 410/420 shields need 300–400°C preheating before spot welding; austenitic series adopt low-current argon arc welding without high preheating.
3. Snap ring installation check: Ensure full close fit between U shield and tube outer arc, symmetrically lock snap rings on both sides to prevent sliding.
4. Annual inspection focus: Check shield plate thinning and edge welding crack conditions, replace severely worn shields in advance to avoid base tube perforation.
5. Storage protection: Stack shields with isolation paper between layers, warehouse dehumidification to prevent surface rust before delivery.
The unique half U outer wrap design is fully optimized for boiler elbow outer arc concentrated abrasion pain points:
1. Single-side outer arc coverage reduces alloy material consumption by nearly half compared to full-circle tube shields, greatly cut boiler anti-wear renovation budget.
2. One-piece integrated stamping eliminates segmented tile splicing gaps, fundamentally avoid ash accumulation and local concentrated abrasion on bend outer surface.
3. Reserved double-side positioning edges compatible with both snap ring and welding two installation processes, flexible for different overhaul schemes.
4. Multi-alloy gradient material matching, customers can select cost-effective grades according to actual flue temperature and sulfur content without over-spec investment.
Custom manufacture U-Type Outer Half-Round Tube Shields based on customer boiler coil drawings, flue temperature and ash abrasion intensity:
Customizable parameters: Matching tube OD, alloy plate thickness, single shield length, U arc radian, bend radius matching coil geometry.
Special custom options: Extra thick anti-abrasion plate, oversized large-radius bend shields, pre-assembled shield + snap ring integrated pieces.
Attached service: Boiler bend abrasion scheme consultation, on-site installation technical guidance, long-term bulk order framework contract.
U outer half round tube shields adopt layered foam isolation packaging to protect U arc stamping surface from collision deformation:
Small batch standard size shields packed into fumigated export wooden boxes with foam filling; bulk large-size products fixed on steel pallets with binding belts, whole pallet wrapped anti-rust stretch film.
Support FOB/CFR/CIF trade terms, sea & land transportation available, each batch attached material report and dimensional inspection record for overseas project acceptance.
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When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.
