| 17MN4 Chemical Composition | |||||||
| Grade | The Element Max (%) | ||||||
| 17MN4 | C | Si | Mn | P | S | Al | Cr |
| 0.14-0.20 | 0.40 | 0.90-1.40 | 0.035 | 0.030 | 0.02 | 0.25 | |
| Cu | Ni | Mo | Nb | Ti | V | ||
| 0.3 | 0.3 | 0.10 | 0.01 | 0.03 | 0.03 | ||
| Grade | 17MN4 Mechanical Property | |
| Thickness | Yield | |
| 17MN4 | mm | Min Mpa |
| 6-16 | 290 | |
| 16-40 | 285 | |
| 40-60 | 280 | |
| 60-100 | 255 | |
| 100-150 | 230 | |
1. What heat treatment processes are required?
Answer:
Standard manufacturing processes:
Normalizing (880-950°C) for thickness >30mm
As-rolled condition for thickness ≤30mm
Optional stress relief annealing (580-620°C)
Thermomechanical Control Process (TMCP) available for improved properties
2. What welding procedures are recommended for 17Mn4?
Answer:
Essential welding practices:
Preheat: 100-150°C (for t>25mm)
Consumables: DIN 8556 E42 4 B 42 or equivalent
Heat Input: 1.8-3.2 kJ/mm
Interpass Temperature: ≤250°C
Post-Weld Heat Treatment (PWHT): 580-620°C × 1hr/25mm (for t>35mm)
3. Where is 17Mn4 typically specified?
Answer:
Common applications include:
Medium-pressure vessels (10-40 bar)
Boiler drums and headers
Heat exchanger shells
Process equipment in chemical plants
Storage tanks for industrial use
Comparison with Similar Grades
| Grade | Standard | Yield Strength | Key Difference |
|---|---|---|---|
| 17Mn4 | DIN 17155 | ≥355 MPa | German standard with optimized Mn content |
| P355GH | EN 10028-2 | ≥355 MPa | European equivalent |
| A516 Gr.70 | ASTM | ≥260 MPa | US standard, lower yield strength |
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