High-temperature & Oxidation-resistant Alloy Tube Protection
1cr20ni14si2 tube shields offer superior resistance to high-temperature oxidation and erosion, ideal for protecting boiler tubes and heat exchangers under extreme thermal stress.
High-temperature & Oxidation-resistant Alloy Tube Protection
1cr20ni14si2 tube shields offer superior resistance to high-temperature oxidation and erosion, ideal for protecting boiler tubes and heat exchangers under extreme thermal stress.
1Cr20Ni14Si2 tube shields, also known as boiler tube shields, anti-erosion shields, or anti-corrosion shields, are specialized components designed to protect boiler tubes from erosion, corrosion, and high-temperature flue gas abrasion in industrial boiler systems. These shields are critical in industries such as power generation, petrochemical processing, and waste-to-energy plants, where boilers operate under extreme conditions involving high-pressure steam, abrasive fly ash, and corrosive chemical reactions. By providing a robust protective barrier, 1Cr20Ni14Si2 tube shields significantly extend tube lifespan, minimize maintenance costs, and enhance operational reliability by preventing premature tube failures and costly downtime.
Manufactured from 1Cr20Ni14Si2 stainless steel, a high-temperature resistant alloy with approximately 20% chromium, 14% nickel, and 2% silicon, these shields offer excellent oxidation and corrosion resistance, particularly in sulfur-containing atmospheres, and can withstand temperatures up to 1000°C. The silicon content enhances the material’s oxidation resistance, while chromium and nickel provide corrosion resistance and high-temperature strength. However, the alloy may exhibit embrittlement of precipitated phases at 600–800°C, which should be considered in specific applications. These shields are ideal for protecting boiler components such as superheaters, reheaters, economizers, and water-cooled walls in fossil fuel-fired boilers, biomass power plants, and circulating fluidized bed (CFB) boilers. For extreme conditions, 1Cr20Ni14Si2 shields can be enhanced with chromium carbide coatings to further improve wear resistance.
1Cr20Ni14Si2 tube shields are available in various configurations—straight, inner-curve, outer-curve, side-curve, and S-curve—to fit diverse tube geometries, including finned tubes and specialty tubing. The shields typically feature a semi-circular (180-degree) cross-section, with customizable wrap angles ranging from 120 to 240 degrees, though 120–160-degree configurations are common for finned tubes like water-cooled walls. The production process utilizes advanced techniques, such as high-pressure pressing and precision mold shaping, to ensure a smooth surface, excellent weldability, and a professional finish. For curved shields, specialized bending processes are employed, with technical drawings specifying parameters like tube outer diameter, bending radius, and angle. The inner diameter of the shield is designed to be 1–3mm larger than the tube’s outer diameter for a secure fit. Common tube sizes include 32mm, 38mm, 42mm, 44.5mm, 48mm, 51mm, 57mm, 60mm, 63.5mm, 76mm, and 89mm, with shield lengths ranging from 20mm to 3000mm, though 1000–2000mm is the most common range for industrial applications. Snap rings, often made from excess 1Cr20Ni14Si2 material, are used to secure the shields to the tubes, typically welded at a 190–200-degree overlap for stability.
These shields are engineered to address critical user needs, such as minimizing downtime and maintenance costs due to tube erosion or corrosion. They are particularly effective in protecting vital boiler components in areas prone to wear, such as the windward side of heating surfaces in fossil fuel-fired boilers, biomass power plants, and CFB boilers. Positive Material Identification (PMI) is employed during production to verify material quality and compliance with industry standards, such as GB 4238 (1992) for heat-resisting steel sheets and plates and GB/T 1221 (1992) for heat-resisting steel bars, ensuring reliability in harsh environments. With a typical service life of 3–5 years, depending on boiler type and operating conditions, 1Cr20Ni14Si2 tube shields offer long-term durability. Customizable features, such as variable wrap angles and end types (straight, belled, or flared), allow for precise adaptation to specific boiler configurations, ensuring optimal protection and performance.
1Cr20Ni14Si2 is a high-temperature stainless steel known for excellent oxidation resistance and high-temperature strength. The designation means:
| Country | Standard | Equivalent Grade |
|---|---|---|
| EU (EN) | EN 10095 | X15CrNiSi20-12 / 1.4828 |
| USA | ASTM A240 | 309 |
| Japan | JIS G4303 | SUH309 |
| Germany | DIN 17459 | X15CrNiSi20-12 |
| Russia | GOST | 20KH20N14S2 |
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | ~20 |
| Nickel (Ni) | ~14 |
| Silicon (Si) | ~2 |
| Material | C | Si | Mn | S | P | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|---|
| 1Cr13 | ≤1.00 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.035 | 11.50–13.50 | ≤0.60 | – |
| 1Cr17Ni2 | 0.11–0.17 | ≤0.80 | ≤0.80 | ≤0.030 | ≤0.035 | 16.00–18.00 | 1.50–2.50 | – |
| 1Cr18Ni9Ti | ≤0.12 | ≤1.00 | ≤2.00 | ≤0.030 | ≤0.035 | 17.00–19.00 | 8.00–11.00 | 5(C%-0.02)–0.80 |
| 1Cr20Ni14Si2 | ≤0.20 | 1.50–2.50 | ≤1.50 | ≤0.030 | ≤0.035 | 24.00–27.00 | 18.00–21.00 | – |
| 1Cr25Ni20Si2 | ≤0.20 | 1.50–2.50 | ≤1.50 | ≤0.030 | ≤0.035 | 19.00–22.00 | 12.00–15.00 | – |
| System | Designation |
|---|---|
| EU (EN) | X15CrNiSi20-12 (1.4828) |
| USA (ASTM) | 309 |
| Germany (DIN) | X15CrNiSi20-12 |
| Japan (JIS) | SUH309 |
| France (AFNOR) | Z17CNS20-12 |
| UK (BS) | 309S24 |
| Italy (UNI) | X16CrNi23-14 |
| China (GB) | 1Cr20Ni14Si2 |
| Poland (PN) | H20N12S2 |
| Czech (ČSN) | 17251 |
| Russia (GOST) | 20KH20N14S2 |
1Cr20Ni14Si2 is equivalent to many high-temperature stainless steels globally, notably 1.4828 (X15CrNiSi20-12) in Europe and 309 in the US.
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