Another top-tier material choice for high-performance downhole safety valve (DHSV) springs is MP35N.
While Inconel X-750 is an industry standard, MP35N is a ultra-high-strength, cobalt-nickel-based alloy designed for the absolute most severe, ultra-deepwater, and highly corrosive environments. When shaped into a power spring (a clock-style or tightly wound constant-force spring used to maximize force in a restricted space) or a traditional heavy compression spring, MP35N offers unparalleled performance.
Here is a detailed look at why MP35N is specified for safety valve springs.
Material Composition and Properties
MP35N is a non-magnetic alloy consisting primarily of:
- Cobalt (35%)
- Nickel (35%)
- Chromium (20%)
- Molybdenum (10%)
Through a combination of work-hardening and age-hardening, MP35N achieves a unique combination of ultra-high mechanical strength, exceptional toughness, and superb biocompatibility/environmental resistance.
Comparison: MP35N VS Inconel X-750
|
Property |
Inconel X-750 |
MP35N |
|
Primary Base |
Nickel-Chromium |
Cobalt-Nickel-Chromium |
|
Tensile Strength |
High |
Ultra-High (Higher than X-750) |
|
Chloride/Brine Resistance |
Excellent |
Maximum |
|
Cost |
Premium |
Very High / Strategic |
|
Typical Application |
Standard to Harsh DHSVs |
HPHT (High-Pressure High-Temp) & Ultra-Sour DHSVs |
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