Mechanical property for 15CrMoR Pressure vessel steel:
|
Thickness (mm) |
|||
|
15CrMoR |
> 6 ≤ 60 |
> 60 ≤ 100 |
>100 |
|
Yield strength (≥Mpa) |
295 |
275 |
255 |
|
Tensile strength (Mpa) |
450-590 |
440-580 |
|
Chemical composition for 15CrMoR Pressure vessel steel (Heat Analysis Max%)
|
Main chemical elements composition of 15CrMoR |
||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
|
0.12-0.18 |
0.15-0.40 |
0.40-0.70 |
0.025 |
0.010 |
0.80-1.20 |
0.45-0.60 |
1. How does the Cr-Mo composition benefit high-temperature applications?
Answer:
The alloy provides:
✔ Enhanced creep resistance at elevated temperatures
✔ Improved oxidation resistance
✔ Good hydrogen embrittlement resistance
✔ Stable microstructure under thermal cycling
2. What heat treatment is required?
Answer:
Mandatory processing:
Normalizing: 880-950°C
Tempering: 680-730°C
Optional:
Stress relief annealing (for thick sections)
Simulated post-weld heat treatment (SPWHT)
3. What welding procedures are critical?
Answer:
Essential practices:
Preheat: 150-200°C
Consumables: GB/T 5117 E6015-B3 or equivalent
Interpass temp: 200-300°C
PWHT: Mandatory (680-720°C × 1hr/25mm)
Hardness control: ≤225 HB
4. Where is 15CrMoR typically used?
Answer:
Primary applications:
Petroleum refining reactors
Hydrogenation vessels
High-temperature heat exchangers
Power plant boiler drums
Catalytic cracking units
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