Vitreous Boiler Steel Tubes Enamel Coated Carbon Steel Boiler Pressure Parts
Product Details
| Wear Protection: | Anti-Abrasion | Welding: | GTAW/SMAW/SAW Per WPS & PQR + Mandatory PWHT |
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| Products: | Boiler Pressure Parts | Material Standards: | GB / ASME / IBR / PED / JIS / KS |
| Application: | Power Station / Industrial / Coking / Biomass Boiler | ||
| Highlight |
Vitreous boiler steel tubes,Boiler Steel Tubes Carbon Steel,Carbon Steel Boiler Pressure Parts |
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Product Description
High-Performance Vitreous Enamel-Coated Steel Tubes
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Superior Acid Resistance: Tested in boiling 30% sulfuric acid, the corrosion weight loss is exceptionally low (≤2.0 g/m²), drastically outperforming traditional ND steel (Corten) and bare carbon steel.
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Optimized Coating Profile: The external enamel coating thickness is strictly controlled between 0.25-0.40 mm. This precise thickness (with an industry standard target of 0.3 mm) provides robust protection while preventing the spalling and cracking associated with overly thick enamel layers.
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Extreme Thermal Durability: The tubes possess exceptional thermal shock resistance, capable of withstanding a sudden quench from 300°C directly into cold water without the vitreous layer cracking or detaching.
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Flawless Surface Integrity: Every single tube undergoes a rigorous 2000V spark test for pin-hole inspection. This 100% root-by-root high-voltage leak detection ensures absolutely no microscopic vulnerabilities remain on the flue gas side.
| Specification | Technical Details |
| Base Tube Material | 20G / SA-210C Carbon Steel (Ensures pressure strength) |
| Tube Diameter | Φ32 - Φ63.5 mm (Mainstream air preheater sizes: Φ40, Φ51) |
| Enamel Coating Thickness | 0.25 - 0.40 mm |
| Coating Type | External Enameling (Flue gas side) / Internal Enameling |
| Max Operating Temperature | Long-term ≤400 °C ; Short-term peak ≤450 °C |
| Acid Resistance Performance | Boiling 30% Sulfuric Acid, Corrosion weight loss ≤2.0 g/m² |
| Pin-Hole Inspection | 2000V Spark Test (100% high-voltage leak detection) |
| Thermal Shock Resistance | 300°C into cold water (No cracking or spalling) |
Frequently Asked Questions (FAQ)
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Why is the external enamel coating thickness limited to 0.25-0.40 mm?While it might seem that a thicker coating provides better protection, enamel that is too thick becomes brittle and is highly susceptible to thermal spalling (flaking off) during the boiler's rapid temperature fluctuations. A thickness of 0.25-0.40 mm provides the perfect balance of chemical impermeability and thermal flexibility.
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How does the 2000V spark test guarantee quality?Even a microscopic pinhole in the enamel can allow sulfuric acid to reach the base SA-210C tube, causing rapid localized corrosion. The 2000V high-voltage test is passed over the entire surface of every tube; if there is a pinhole, the voltage arcs, instantly identifying the defect so the tube can be repaired or scrapped.
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Can these tubes withstand the thermal fluctuations of boiler startups and shutdowns?Yes. The defining characteristic of high-quality vitreous enamel-coated steel tubes is their thermal shock performance. Our tubes are engineered to survive extreme thermal shocks, such as being plunged from 300°C into cold water, without compromising the glass-like coating.
Product Highlights
High-Performance Vitreous Enamel-Coated Steel Tubes Usage and Application Vitreous enamel-coated steel tubes are specialized heat exchange elements engineered specifically to combat severe cold-end corrosion in boiler tubular air preheaters. During the combustion of sulfur-bearing fuels, flue gas ...
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