Practical Applications of Nickel-Based Alloy Incoloy 800HT in Different Corrosive Media
author: www.qishine.com
2025-05-02
1. Corrosion Resistance to Oxidizing Media
Mechanism Analysis
The high chromium content (19-23%) of Incoloy 800HT enables the formation of a dense Cr₂O₃ oxide layer in oxidizing environments. This layer exhibits exceptional chemical stability and self-healing properties, effectively preventing further oxidation corrosion. Additionally, the presence of nickel and iron enhances the alloy's oxidation resistance at high temperatures.
Mechanism Analysis
The high chromium content (19-23%) of Incoloy 800HT enables the formation of a dense Cr₂O₃ oxide layer in oxidizing environments. This layer exhibits exceptional chemical stability and self-healing properties, effectively preventing further oxidation corrosion. Additionally, the presence of nickel and iron enhances the alloy's oxidation resistance at high temperatures.
Experimental Data
Nitric Acid (HNO₃) Environment:
- In 65% nitric acid at boiling temperature (120°C), the corrosion rate is <0.1 mm/year.
- In 98% nitric acid at room temperature, the corrosion rate is <0.05 mm/year.
- Comparative data: 304 stainless steel can exhibit a corrosion rate of up to 1 mm/year under the same conditions.
Nitric Acid (HNO₃) Environment:
- In 65% nitric acid at boiling temperature (120°C), the corrosion rate is <0.1 mm/year.
- In 98% nitric acid at room temperature, the corrosion rate is <0.05 mm/year.
- Comparative data: 304 stainless steel can exhibit a corrosion rate of up to 1 mm/year under the same conditions.
High-Temperature Air Oxidation:
- In air at 800°C, the oxidation weight gain after 1000 hours is ≤0.1 mg/cm².
- In air at 1000°C, the oxidation weight gain after 1000 hours is ≤0.5 mg/cm².
- In air at 800°C, the oxidation weight gain after 1000 hours is ≤0.1 mg/cm².
- In air at 1000°C, the oxidation weight gain after 1000 hours is ≤0.5 mg/cm².
Practical Applications
- Used in nitric acid production equipment, heat exchangers, and furnace tubes in high-temperature oxidizing environments.
- Employed in high-temperature steam pipelines in nuclear reactors, demonstrating excellent oxidation resistance.
- Used in nitric acid production equipment, heat exchangers, and furnace tubes in high-temperature oxidizing environments.
- Employed in high-temperature steam pipelines in nuclear reactors, demonstrating excellent oxidation resistance.
2. Corrosion Resistance to Reducing Media
Mechanism Analysis
Mechanism Analysis
The high nickel content (30-35%) of Incoloy 800HT provides excellent resistance to reducing media. Nickel effectively resists the attack of reducing acids such as sulfuric acid and hydrochloric acid, while the synergistic effect of iron and chromium further enhances the corrosion resistance of Incoloy 800HT Stud Bolt in such environments.
Experimental Data
Sulfuric Acid (H₂SO₄) Environment:
- In 10% sulfuric acid at room temperature, the corrosion rate is <0.1 mm/year.
- In 50% sulfuric acid at 80°C, the corrosion rate is <0.5 mm/year.
- Comparative data: 316L stainless steel can exhibit a corrosion rate of up to 1.5 mm/year under the same conditions.
Sulfuric Acid (H₂SO₄) Environment:
- In 10% sulfuric acid at room temperature, the corrosion rate is <0.1 mm/year.
- In 50% sulfuric acid at 80°C, the corrosion rate is <0.5 mm/year.
- Comparative data: 316L stainless steel can exhibit a corrosion rate of up to 1.5 mm/year under the same conditions.
Hydrochloric Acid (HCl) Environment:
- In 1% hydrochloric acid at room temperature, the corrosion rate is <0.1 mm/year.
- In 5% hydrochloric acid at 50°C, the corrosion rate is <0.3 mm/year.
- Comparative data: Ordinary carbon steel can exhibit a corrosion rate of up to 10 mm/year under the same conditions.
- In 1% hydrochloric acid at room temperature, the corrosion rate is <0.1 mm/year.
- In 5% hydrochloric acid at 50°C, the corrosion rate is <0.3 mm/year.
- Comparative data: Ordinary carbon steel can exhibit a corrosion rate of up to 10 mm/year under the same conditions.
Practical Applications
- Used in sulfuric acid production equipment, hydrochloric acid storage tanks, and pipeline systems.
- Employed in reactors and heat exchangers for handling reducing media in the chemical industry.
- Used in sulfuric acid production equipment, hydrochloric acid storage tanks, and pipeline systems.
- Employed in reactors and heat exchangers for handling reducing media in the chemical industry.
3. Resistance to Chloride Stress Corrosion Cracking (Cl-SCC)
Mechanism Analysis
The high nickel content and optimized chemical composition of Incoloy 800HT provide excellent resistance to chloride stress corrosion cracking. Nickel reduces the alloy's susceptibility to Cl-SCC, while the presence of chromium and iron further enhances its corrosion resistance.
Mechanism Analysis
The high nickel content and optimized chemical composition of Incoloy 800HT provide excellent resistance to chloride stress corrosion cracking. Nickel reduces the alloy's susceptibility to Cl-SCC, while the presence of chromium and iron further enhances its corrosion resistance.
Experimental Data
Magnesium Chloride (MgCl₂) Environment:
- In a boiling 42% MgCl₂ solution (155°C), the time to stress corrosion cracking is >1000 hours.
- Comparative data: 304 stainless steel may crack within 100 hours under the same conditions.
- Seawater Environment: - No stress corrosion cracking occurs during long-term use in seawater environments.
Magnesium Chloride (MgCl₂) Environment:
- In a boiling 42% MgCl₂ solution (155°C), the time to stress corrosion cracking is >1000 hours.
- Comparative data: 304 stainless steel may crack within 100 hours under the same conditions.
- Seawater Environment: - No stress corrosion cracking occurs during long-term use in seawater environments.
High-Temperature and High-Pressure Water Environment:
- In water at 300°C and 10 MPa with a chloride concentration of ≤1000 ppm, no stress corrosion cracking occurs.
- In water at 300°C and 10 MPa with a chloride concentration of ≤1000 ppm, no stress corrosion cracking occurs.
Practical Applications
- Used in seawater desalination equipment, offshore platform components, and nuclear reactor cooling systems.
- Employed in pipelines and equipment for chloride environments in the oil and gas industry.
- Used in seawater desalination equipment, offshore platform components, and nuclear reactor cooling systems.
- Employed in pipelines and equipment for chloride environments in the oil and gas industry.
Hex head bolt
4. Corrosion Resistance to Other Media
Alkaline Media
Experimental Data:
- In 50% NaOH at 100°C, the corrosion rate is <0.1 mm/year.
- In 10% NaOH at boiling temperature, the corrosion rate is <0.05 mm/year.
Alkaline Media
Experimental Data:
- In 50% NaOH at 100°C, the corrosion rate is <0.1 mm/year.
- In 10% NaOH at boiling temperature, the corrosion rate is <0.05 mm/year.
Practical Applications:
- Used in alkali storage tanks, alkali treatment equipment, and chemical reactors.
- Used in alkali storage tanks, alkali treatment equipment, and chemical reactors.
Organic Acids
Experimental Data:
- In organic acids such as acetic acid and formic acid, the corrosion rate is <0.05 mm/year.
- In organic acids such as acetic acid and formic acid, the corrosion rate is <0.05 mm/year.
Practical Applications:
- Used in organic acid production equipment, food processing equipment, and chemical pipelines.
- Used in organic acid production equipment, food processing equipment, and chemical pipelines.
High-Temperature Sulfide Environments
Experimental Data:
- In high-temperature hydrogen sulfide (H₂S) environments, its corrosion resistance is superior to that of ordinary stainless steel and low-alloy steel.
- In high-temperature hydrogen sulfide (H₂S) environments, its corrosion resistance is superior to that of ordinary stainless steel and low-alloy steel.
Practical Applications:
- Used in pipelines and equipment for hydrogen sulfide environments in the oil and gas industry.
- Used in pipelines and equipment for hydrogen sulfide environments in the oil and gas industry.
5. Summary of Corrosion Resistance Performance
| Corrosion Media Type | Typical Environment | Corrosion Rate/Performance | Remarks |
| Oxidizing Media | 65% HNO₃, boiling temperature | <0.1 mm/year | Excellent oxidation resistance |
| Reducing Media | 10% H₂SO₄, room temperature | <0.1 mm/year | Good resistance to reducing acids |
| Chloride Environment | 42% MgCl₂, boiling temperature | >1000 hours, no cracking | Excellent resistance to Cl-SCC |
| Alkaline Media | 50% NaOH, 100°C | <0.1 mm/year | Good alkali resistance |
| Organic Acids | Acetic acid, formic acid | <0.05 mm/year | Excellent organic acid resistance |
| High-Temperature Sulfides | H₂S environment | Superior to ordinary stainless steel | Good sulfide corrosion resistance |
6. Typical Application Fields
The excellent corrosion resistance of Incoloy 800HT makes it widely applicable in the following fields:
- Chemical Industry: Reactors, heat exchangers, and pipeline systems.
- Marine Engineering: Seawater desalination equipment and offshore platform components.
- Nuclear Industry: Nuclear reactor cooling systems and steam generators.
- Oil and Gas: Oil and gas extraction equipment and pipelines in hydrogen sulfide environments.
- Food Processing: Organic acid handling equipment and high-temperature sterilization equipment.
The excellent corrosion resistance of Incoloy 800HT makes it widely applicable in the following fields:
- Chemical Industry: Reactors, heat exchangers, and pipeline systems.
- Marine Engineering: Seawater desalination equipment and offshore platform components.
- Nuclear Industry: Nuclear reactor cooling systems and steam generators.
- Oil and Gas: Oil and gas extraction equipment and pipelines in hydrogen sulfide environments.
- Food Processing: Organic acid handling equipment and high-temperature sterilization equipment.
7. Summary of Corrosion Resistance Performance
Incoloy 800HT, with its high nickel and chromium content and optimized chemical composition, demonstrates exceptional corrosion resistance in oxidizing media, reducing media, and chloride stress corrosion cracking environments. Its superior performance meets the demanding requirements of industrial applications, making it an ideal material choice for the chemical, marine, nuclear, and oil and gas industries. Typical applications include critical components such as the Incoloy 800HT Nut.
Incoloy 800HT, with its high nickel and chromium content and optimized chemical composition, demonstrates exceptional corrosion resistance in oxidizing media, reducing media, and chloride stress corrosion cracking environments. Its superior performance meets the demanding requirements of industrial applications, making it an ideal material choice for the chemical, marine, nuclear, and oil and gas industries. Typical applications include critical components such as the Incoloy 800HT Nut.
Qishine is ideal choice for EPC companies and project contractors.
Website: www.qishine.com
Email: qishine@qishine.com
Tel: 0592-5225595
WhatsApp: +86 15960259563
+86 15985833169
Website: www.qishine.com
Email: qishine@qishine.com
Tel: 0592-5225595
WhatsApp: +86 15960259563
+86 15985833169
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