HFW Finned Tube Serrated Type SA387 Grade 12, 13CrMo4–5 Fins for Power Plant HRSG
An HRSG (Heat Recovery Steam Generator) comprises three core sections:
1.7335 13CrMo4–5 Alloy Steel Fins Equivalent Designations
| Standard | Equivalent Grade |
| EN (Europe) | 1.7335 / 13CrMo4-5 |
| ASTM (USA) | SA387 Grade 12 |
| JIS (Japan) | SFVAF12 |
1.7335 13CrMo4–5 Alloy Steel Fins Chemical Composition (wt%)
| Element | C | Si | Mn | Cr | Mo | P (max) | S (max) |
| 13CrMo4-5 | 0.08–0.18 | 0.15–0.35 | 0.40–0.70 | 1.00–1.50 | 0.45–0.65 | 0.025 | 0.015 |
1.7335 13CrMo4–5 Alloy Steel Fins Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 440–640 MPa |
| Yield Strength (Rp0.2) | ≥270 MPa |
| Elongation (A₅) | ≥20% |
| Impact Energy (KV, 20°C) | ≥40 J |
| Hardness (HB) | ≤200 |
HRSG Tube Types, Parameters, and Functions
| Tube Type | Key Parameters | Function |
|---|---|---|
| Economizer | - OD: 25–50 mm - Temp: 250–350°C - Pressure: 5–15 MPa |
Preheats feedwater using exhaust gas, improving thermal efficiency. |
| Evaporator | - OD: 30–60 mm - Temp: 300–400°C - Pressure: 10–20 MPa |
Converts water to steam via heat absorption from flue gas. |
| Superheater | - OD: 25–50 mm - Temp: 500–600°C - Pressure: 15–25 MPa |
Increases steam temperature above saturation for turbine efficiency. |
| Serrated Fins | - Height: 12–25 mm - Thickness: 1–2 mm - FPI: 3–7 |
Enhances heat transfer via turbulence and surface area (used in all sections). |
