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UNS N09925 Thread Rod
QS Fastener: UNS N09925 Thread Rod
Name: UNS N09925 Thread Rod
Standard: ANSI
Material: Incoloy 925
Size: M64
Length: 1000 mm
Product Grade: A
Strength of Extension: 650 N/mm²
Feature: Good Mechanical Strength and Extensive Corrosion Resistance
Application: For Oil and Gas Drilling Equipment
Standard: ANSI
Material: Incoloy 925
Size: M64
Length: 1000 mm
Product Grade: A
Strength of Extension: 650 N/mm²
Feature: Good Mechanical Strength and Extensive Corrosion Resistance
Application: For Oil and Gas Drilling Equipment
Quantity
UNS N09925 Thread Rod, manufactured from high-performance Incoloy 925 nickel-based alloy, strictly complies with ANSI standards and is classified as Grade A. With a standard size of M64 and a length of 1000 mm, it boasts a tensile strength of up to 650 N/mm². This product offers exceptional mechanical strength and broad corrosion resistance, making it particularly suitable for extreme operating environments such as oil and gas drilling equipment.
UNS N09925 Thread Rod is renowned for its outstanding corrosion resistance, enabling long-term stable performance in acidic, alkaline, and chloride environments. Its excellent corrosion resistance is primarily attributed to its unique chemical composition (nickel, chromium, molybdenum, copper, titanium, etc.) and stable austenitic structure. As a high-performance fastener, UNS N09925 Thread Rod is widely used in the oil, gas, and chemical industries.
1. Chemical Composition and Corrosion Resistance Mechanism
The chemical composition of UNS N09925 Thread Rod is as follows:
- Nickel (Ni): 40-45%, providing excellent corrosion resistance and stress corrosion cracking resistance.
- Chromium (Cr): 19.5-23.5%, forming a dense chromium oxide protective film to resist oxidation and corrosion.
- Molybdenum (Mo): 2.5-3.5%, enhancing resistance to chlorides and reducing media.
- Copper (Cu): 1.5-3.0%, improving resistance to acidic media such as sulfuric and phosphoric acids.
- Titanium (Ti): 1.9-2.4%, enhancing intergranular corrosion resistance through stabilization treatment.
The chemical composition of UNS N09925 Thread Rod is as follows:
- Nickel (Ni): 40-45%, providing excellent corrosion resistance and stress corrosion cracking resistance.
- Chromium (Cr): 19.5-23.5%, forming a dense chromium oxide protective film to resist oxidation and corrosion.
- Molybdenum (Mo): 2.5-3.5%, enhancing resistance to chlorides and reducing media.
- Copper (Cu): 1.5-3.0%, improving resistance to acidic media such as sulfuric and phosphoric acids.
- Titanium (Ti): 1.9-2.4%, enhancing intergranular corrosion resistance through stabilization treatment.
The synergistic effect of these elements enables UNS N09925 Thread Rod to perform exceptionally well in various corrosive environments, making it an ideal choice for high-performance fasteners.
2. Corrosion Resistance in Acidic Environments
UNS N09925 Thread Rod exhibits excellent corrosion resistance in various acidic media, particularly in sulfuric, hydrochloric, and phosphoric acids. Below are its corrosion rate data in different acidic environments:
UNS N09925 Thread Rod exhibits excellent corrosion resistance in various acidic media, particularly in sulfuric, hydrochloric, and phosphoric acids. Below are its corrosion rate data in different acidic environments:
| Acidic Medium | Concentration (%) | Temperature (°C) | Corrosion Rate (mm/year) |
| Sulfuric Acid (H₂SO₄) | 10 | 25 | < 0.01 |
| Sulfuric Acid (H₂SO₄) | 50 | 80 | < 0.1 |
| Hydrochloric Acid (HCl) | 10 | 25 | < 0.05 |
| Hydrochloric Acid (HCl) | 20 | 50 | < 0.2 |
| Phosphoric Acid (H₃PO₄) | 30 | 80 | < 0.01 |
- Sulfuric Acid Environment: At low concentrations and room temperature, the corrosion rate is extremely low; at high concentrations and elevated temperatures, it remains relatively low.
- Hydrochloric Acid Environment: At low concentrations and room temperature, the corrosion rate is low; at high concentrations and elevated temperatures, the corrosion rate increases slightly but remains superior to most stainless steels and nickel-based alloys.
- Phosphoric Acid Environment: At high temperatures and concentrations, the corrosion rate is extremely low, demonstrating excellent corrosion resistance.
The outstanding performance of UNS N09925 Thread Rod in acidic environments makes it the fastener of choice in the chemical and oil industries.
3. Corrosion Resistance in Alkaline Environments
UNS N09925 Thread Rod also performs exceptionally well in alkaline environments, particularly in sodium hydroxide and potassium hydroxide solutions. Below are its corrosion rate data in different alkaline environments:
UNS N09925 Thread Rod also performs exceptionally well in alkaline environments, particularly in sodium hydroxide and potassium hydroxide solutions. Below are its corrosion rate data in different alkaline environments:
| Alkaline Medium | Concentration (%) | Temperature (°C) | Corrosion Rate (mm/year) |
| Sodium Hydroxide (NaOH) | 10 | 25 | < 0.01 |
| Sodium Hydroxide (NaOH) | 50 | 80 | < 0.05 |
| Potassium Hydroxide (KOH) | 20 | 50 | < 0.01 |
- Sodium Hydroxide Environment: At low concentrations and room temperature, the corrosion rate is extremely low; at high concentrations and elevated temperatures, the corrosion rate increases slightly but remains low.
- Potassium Hydroxide Environment: At high temperatures and concentrations, the corrosion rate is extremely low, demonstrating excellent corrosion resistance.
The stable performance of UNS N09925 Thread Rod in alkaline environments makes it widely applicable in the chemical and energy sectors.
4. Corrosion Resistance in Chloride Environments
UNS N09925 Thread Rod exhibits excellent resistance to pitting and stress corrosion cracking in chloride environments, particularly in seawater and salt spray environments. Below are its corrosion rate data in different chloride environments:
UNS N09925 Thread Rod exhibits excellent resistance to pitting and stress corrosion cracking in chloride environments, particularly in seawater and salt spray environments. Below are its corrosion rate data in different chloride environments:
| Chloride Medium | Concentration (%) | Temperature (°C) | Corrosion Rate (mm/year) |
| Sodium Chloride (NaCl) | 3.5 | 25 | < 0.01 |
| Sodium Chloride (NaCl) | 10 | 80 | < 0.05 |
| Seawater | - | 25 | < 0.01 |
| Seawater | - | 50 | < 0.02 |
- Sodium Chloride Environment: At low concentrations and room temperature, the corrosion rate is extremely low; at high concentrations and elevated temperatures, the corrosion rate increases slightly but remains low.
- Seawater Environment: At room and elevated temperatures, the corrosion rate is extremely low, demonstrating excellent resistance to pitting and stress corrosion cracking.
The exceptional performance of UNS N09925 Thread Rod in chloride environments makes it an ideal choice for marine engineering and chemical equipment.
5. Summary of Corrosion Resistance Advantages
UNS N09925 Thread Rod offers significant advantages in corrosion resistance in the following aspects:
- Broad Applicability: Suitable for various corrosive environments, including acidic, alkaline, and chloride media.
UNS N09925 Thread Rod offers significant advantages in corrosion resistance in the following aspects:
- Broad Applicability: Suitable for various corrosive environments, including acidic, alkaline, and chloride media.
- High-Temperature Stability: Maintains excellent corrosion resistance even at elevated temperatures.
- Resistance to Pitting and Stress Corrosion Cracking: Performs exceptionally well in chloride environments, making it particularly suitable for marine and chemical applications.
- Long Service Life: Offers extended durability in corrosive environments, reducing maintenance costs.
As a high-performance fastener, UNS N09925 Thread Rod plays an irreplaceable role in the oil, gas, chemical, and marine engineering industries.
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