Products Specification
A low-alloy ND steel 09CrCuSb resistant to the dew-point corrosion of sulfuric acid for seamless steel pipe, plate, forged part and special welding material is prepared through smelting in ultra high-power electric furnace, refining outside the furnace, vacuum degassing, conticasting and tandem rolling.
It features that during the corrosion, a compact passivated film rich in Cr, Cu, Sb and Ti is generated on its surface, so having very high anticorrosion power.
| Item | Description |
|---|---|
| Product Name | 09CrCuSb (ND Steel) Boiler Tube |
| Product Type | Boiler Tube |
| Grade | ND Steel (09CrCuSb) |
| Application | Boiler / Heat Exchanger / Economizer |
| Outer Diameter | 25 – 356 mm |
| Thickness | 2.5 – 80 mm |
| Length | 5 m – 12 m (customizable) |
| Technical Process | Hot Rolled Seamless |
| Highlights | Steel Seamless Tube 09CrCuSb, 5m Steel Seamless Tube |
Composition specification (GB 150.2-2011)
| C | ≤0.12 | Cr | 0.70~1.10 |
| Si | 0.20~0.40 | Cu | 0.25~0.45 |
| Mn | 0.35~0.65 | Sb | 0.04~0.10 |
| P | ≤0.030 | S | ≤0.020 |
Mechanical Property
|
Nominal Thickness (mm) |
Tensile Strength Rm(MPa) |
Yield Strength ReL(MPa) |
Elongation A(%) |
| ≤8 | 390~550 | ≥245 | ≥25 |
Products Application
The 09CrCuSb (ND Steel) boiler tube is widely applied in industries exposed to sulfur-containing flue gases and acidic condensation environments, where ordinary carbon steel or even stainless steel cannot perform effectively.
Its outstanding sulfuric acid dew point corrosion resistance makes it one of the most economical and durable materials for boiler and heat recovery systems.
In coal-fired power plants, ND steel tubes are used in economizers, air preheaters, condensers, and heat exchangers, where the flue gas temperature ranges between 90°C and 200°C-a range where acid dew point corrosion is most severe.
Field data shows: in typical 1000 MW power units, the corrosion rate of ordinary carbon steel exceeds 2.5 mm/year, while 09CrCuSb tubes maintain <0.05 mm/year, extending service life by over 15 times.
Service lifespan: 8–10 years (ND steel) vs. 0.5–1 year (carbon steel).
Replacement cycle reduced by 80%, lowering maintenance costs by over 40%.
