1Cr6Si2Mo heat resistant alloy tube shield designed for boiler economizer & low superheater, excellent sulfur corrosion resistance, cost-effective medium temperature anti-abrasion protective plate.
1Cr6Si2Mo tube shield is a medium-temperature heat resistant alloy anti-wear protective cover, specially developed for boiler economizer and low-temperature superheater working zones. It belongs to chromium-silicon-molybdenum martensitic heat resistant alloy, neither ordinary carbon steel nor nickel-containing stainless steel, with targeted anti-sulfur flue oxidation performance within 600℃ operating temperature range.
This series tube shield is integrally stamped from 1Cr6Si2Mo alloy plate, available in semi-circular single tube protective cover, flat fin protective plate and special wave shaped fin baffle three structural forms. It solves the abrasion thinning problem of heat exchange tubes caused by sulfur-containing ash particle scouring in tail flue of coal-fired boilers and circulating fluidized bed boilers.
Compared with 309S and 310S stainless steel tube shields, 1Cr6Si2Mo material has obvious cost advantage under medium temperature working conditions, and has become the mainstream standard matching wear part for power plant economizer reconstruction projects.
1Cr6Si2Mo alloy erosion shield balances temperature resistance, sulfur corrosion resistance and project cost, with outstanding comprehensive advantages for tail boiler flue:
The alloy formula strictly follows GB/T 1221 heat resistant steel standard, controlled impurity elements to avoid high temperature brittleness:
| Element | Mass Fraction Range (%) | Material Function |
|---|---|---|
| C Carbon | ≤0.15 | Low carbon to reduce welding cold crack tendency |
| Si Silicon | 1.5 ~ 2.0 | Enhance high temperature anti-oxidation & sulfur resistance |
| Cr Chromium | 5.0 ~ 6.5 | Form Cr₂O₃ protective layer against flue erosion |
| Mo Molybdenum | 0.45 ~ 0.60 | Improve high temperature creep strength |
| Mn Manganese | ≤0.70 | Deoxidation & impurity stabilization |
| S / Sulfur, P Phosphorus | ≤0.03 / ≤0.035 | Strict limit to prevent grain boundary brittleness |
Mass stock semi-circular tube shields match mainstream economizer tube outer diameters, flat and wave fin plates support full drawing customization:
| Matched Tube OD (mm) | Alloy Plate Thickness (mm) | Shield Total Length Range (mm) | Common Structure Type |
|---|---|---|---|
| 32 / 38 / 42 | 6 / 8 | 100 ~ 1200 | Semi-circular single tube shield |
| 51 / 57 / 60 | 8 / 10 | 150 ~ 1800 | Semi-circular shield / flat fin plate |
| 76 / 89 | 10 / 12 | 200 ~ 2500 | Wave shaped water wall baffle |
Ultra-thick plate, extra long size and non-standard arc radian can be customized according to power plant boiler overhaul drawings.
| Material Grade | Material Category | Max Continuous Temp | Core Application Zone |
|---|---|---|---|
| Q235 | Ordinary Carbon Steel | ≤400℃ | Low temperature waste heat boiler |
| 1Cr13 | Martensitic Stainless Steel | ≤550℃ | Mild abrasion low flue temperature |
| 1Cr6Si2Mo | Cr-Si-Mo Heat Resistant Alloy (Non Stainless) | ≤600℃ | Economizer / Low Superheater sulfur flue |
| 309S | Austenitic Stainless Steel | ≤850℃ | Medium high temperature superheater |
| 310S | Austenitic Stainless Steel | ≤1050℃ | Furnace arch dense phase high temp zone |
Material Selection Tip: Choose 1Cr6Si2Mo tube shield if working flue temperature is below 600℃ and contains sulfur ash particles to control overall project cost.
| Product Name | Function | Matching Application |
|---|---|---|
| 1Cr6Si2Mo Tube Shield | Semi-circular tube surface anti-abrasion cover | Economizer low temp heat exchange tube |
| C / U Shaped Snap Rings | Fasten single tube erosion shield | Small diameter economizer tube bundle |
| Cast Pipe Clamp | Heavy duty saddle fixing clamp | Large size shield assembly fixing |
| Wave Water Wall Anti-wear Plate | Fin buffer protective baffle | Water wall fin transition abrasion zone |
1Cr6Si2Mo tube shield targets medium-temperature tail heating surfaces with sulfur-containing ash scouring:
| Contrast Item | 1Cr6Si2Mo Tube Shield | 309S Stainless Shield |
|---|---|---|
| Max Continuous Service Temp | 600℃ | 850℃ |
| Sulfur Flue Resistance | Excellent, special Si-Cr formula | General, prone to sulfide corrosion |
| Raw Material Cost | Low, no nickel element | High, high nickel alloy |
| Boiler Application Range | Economizer / low superheater | High temperature superheater / furnace outlet |
| Long-term Operation Cost | Low initial investment | Higher one-time procurement cost |
1Cr6Si2Mo heat resistant alloy has strict welding operation requirements to avoid crack defects:
Preheat workpiece to 300~400℃ before welding, select matching heat resistant alloy welding rod, implement slow furnace cooling after welding to eliminate welding stress and cold cracks.
For snap ring fixed installation: Buckle the semi-circular shield on the tube surface, lock C/U snap rings at both ends to prevent shield displacement under flue impact.
During annual boiler overhaul, check shield thickness thinning and welding crack condition, replace severely abraded shields in advance to avoid tube leakage risk.
Avoid violent hammer knocking during hoisting to prevent hidden stamping cracks on alloy plate body.
The 1Cr6Si2Mo material formula is specially developed for medium-temperature sulfur-containing tail flue environment of coal-fired boilers:
Silicon element cooperates with chromium to form compact anti-sulfur oxidation film, solving the early thinning problem of ordinary carbon shields in sulfur ash flue.
Molybdenum element improves high temperature creep resistance, the alloy plate will not permanently deform under long-term alternating flue vibration of economizer tube bundle.
Low carbon composition greatly reduces welding crack risk, suitable for on-site boiler overhaul random cutting and repair welding operation.
Multiple structural forms (semi-circle, flat, wave) are available to match straight tubes and fin transition zones of all types of heating surfaces.
We support full personalized customization according to boiler overhaul drawings and flue working parameters:
Custom matching tube outer diameter, alloy plate thickness, shield total length, semi-circular radian and wave fin height; develop special stamping molds for non-standard heating surface layout.
Optional surface treatment: Sand blasting only or high temperature anti-rust paint coating for long-term inventory storage.
Provide professional boiler anti-abrasion scheme consultation, on-site installation technical guidance and long-term bulk spare parts supply contract for power plant projects.
1Cr6Si2Mo alloy tube shields adopt layered separation packaging to prevent stamping arc extrusion deformation during long-distance sea and land transportation:
Small batch finished shields separated by foam strips and packed into solid export wooden cases; large bulk goods fixed with steel straps on standard pallets, wrapped with anti-rust plastic film outside.
Support FOB, CFR, CIF international trade terms, sea and land transportation available. Complete material spectral reports and dimensional inspection certificates are attached with each shipment for power plant project acceptance and customs clearance.
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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.
