Springs for Hydrogen Sulfide (H₂S) Environments
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Author:Bosswinn
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Published time: 2025-02-09
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Springs for Hydrogen Sulfide (H₂S) Environments
Inconel X750, MP35N, and Elgiloy
These alloys are recognized by NACE (National Association of Corrosion Engineers) for use in H₂S environments. They vary in terms of strength and corrosion resistance.
MP35N and Elgiloy offer excellent seawater corrosion resistance and are stronger than Inconel X750.
Their superior strength allows for the design of more compact springs, improving system performance and reducing costs.
The Challenge of H₂S Environments
Hydrogen sulfide (H₂S) is highly corrosive, quickly degrading springs and other metal components, leading to failure.
Coatings and platings provide limited protection, as even minor defects can cause corrosion and internal cracking.
Therefore, spring materials commonly used in H₂S environments include:
These alloys have different strengths and corrosion resistance properties, making them suitable for various industrial applications.
A. Inconel X750 Spring Description
Material Type
Properties
Cold drawn and precipitation hardened after forming
Good corrosion resistance at high temperatures
High-strength nickel-chromium-aluminum alloy
Not suitable for extension springs requiring initial tension
Available Forms
Wire: Available
Strip: Available
Sheet/Plate: Available
Applications
Inconel X750 Extension Springs
Inconel X750 Compression Springs
Inconel X750 Torsion Springs
Inconel X750 Wireforms
Engineering Data
| Parameter | Value |
|---|
| Elastic Modulus (E) | 214,000 MPa / 31,000,000 psi |
| Shear Modulus (G) | 79,300 MPa / 11,500,000 psi |
| Density | 8.250 g/cm³ / 0.298 lb/in³ |
| Conductivity | 1% IACS |
| Min Size | 0.004 in / 0.100 mm |
| Max Size | 0.500 in / 12.500 mm |
| Max Operating Temperature | 595°C / 1100°F |
Technical Specifications
E (Young’s Modulus): Affected by cold work, heat treatment, and operational stress.
G (Shear Modulus): Influences torsion and shear resistance.
Conductivity (% IACS): Measures electrical conductivity.
Surface Quality:
Class A: Max defect depth 0-0.5% of diameter or thickness.
Class B: Max defect depth 1.0% of diameter or thickness.
Class C: Max defect depth <3.5% of diameter or thickness.
Size Range: Standard wire and strip sizes available; custom sizes may incur additional costs.
Max Temperature: May vary depending on operational stress.
B. MP35N Spring Description
Material Type
Material Name: MP35N
Category: N/A
Properties
Precipitation-hardenable nickel-cobalt alloy
Ultra-high strength, toughness, and ductility
Exceptional corrosion resistance
Resistant to H₂S, seawater, and chloride solutions
Excellent resistance to crevice corrosion and stress corrosion cracking in seawater
Available Forms
Wire: Available
Strip: Available
Sheet/Plate: Available
Engineering Data
| Parameter | Value |
|---|
| Elastic Modulus (E) | 234,000 MPa / 33,900,000 psi |
| Shear Modulus (G) | 80,700 MPa / 7,100,000 psi |
| Density | 8.430 g/cm³ / 0.304 lb/in³ |
| Conductivity | 0% IACS |
| Min Size | N/A |
| Max Size | N/A |
| Max Operating Temperature | 315°C / 600°F |
Applications
Technical Notes
E (Young’s Modulus): Affected by cold work, heat treatment, and operational stress.
G (Shear Modulus): Influences torsion and shear resistance.
Conductivity (% IACS): Measures electrical conductivity.
Surface Quality:
Class A: Max defect depth 0-0.5% of diameter or thickness.
Class B: Max defect depth 1.0% of diameter or thickness.
Class C: Max defect depth <3.5% of diameter or thickness.
Size Range: Standard wire and strip sizes available; custom sizes may incur additional costs.
Max Temperature: May vary depending on operational stress.
C. Elgiloy Spring Description
Material Type
Material Name: Elgiloy
Category: N/A
Properties
Precipitation-hardenable cobalt-chromium-nickel alloy
High strength, good ductility, and excellent mechanical properties
Outstanding fatigue life
Superior corrosion resistance in various environments
Non-magnetic
Available Forms
Engineering Data
| Parameter | Value |
|---|
| Elastic Modulus (E) | 203,400 MPa / 29,500,000 psi |
| Shear Modulus (G) | 77,000 MPa / 11,200,000 psi |
| Density | 8.300 g/cm³ / 0.300 lb/in³ |
| Conductivity | 0% IACS |
| Min Size | N/A |
| Max Size | N/A |
| Max Operating Temperature | 450°C / 840°F |
Applications
Technical Notes
E (Young’s Modulus): Affected by cold work, heat treatment, and operational stress.
G (Shear Modulus): Influences torsion and shear resistance.
Conductivity (% IACS): Measures electrical conductivity.
Surface Quality:
Class A: Max defect depth 0-0.5% of diameter or thickness.
Class B: Max defect depth 1.0% of diameter or thickness.
Class C: Max defect depth <3.5% of diameter or thickness.
Size Range: Standard wire and strip sizes available; custom sizes may incur additional costs.
Max Temperature: May vary depending on operational stress.
Summary
Inconel X750: High-temperature resistance, good corrosion resistance.
MP35N: Ultra-high strength, superior corrosion resistance in seawater and H₂S environments.
Elgiloy: High strength, excellent fatigue resistance, and corrosion resistance.
Each material has its unique advantages based on the operating environment and performance requirements.
