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Inconel 600 Hex Head Bolt
QS Fastener: Inconel 600 Hex Head Bolt
Name: Inconel 600 Hex Head Bolt
Material: Inconel 600
Standard: UNS N06600
Size: M10
Hardness: 195 HB
Length: 30 to 800 mm
Application: For Petrochemical Industry and High temperatures above 700 degrees Celsius
Feature: High Temperature Corrosion Resistance
Material: Inconel 600
Standard: UNS N06600
Size: M10
Hardness: 195 HB
Length: 30 to 800 mm
Application: For Petrochemical Industry and High temperatures above 700 degrees Celsius
Feature: High Temperature Corrosion Resistance
Quantity
Inconel 600 Hex Head Bolt is manufactured from a heat-resistant nickel-based alloy (UNS N06600) with a hardness of 195 HB, specifically designed for extreme environments such as petrochemical and energy applications where temperatures exceed 700°C. With outstanding resistance to high-temperature oxidation and corrosion, these bolts are available in M10 sizes, lengths ranging from 30-800 mm, and support customized production, making them a reliable fastening solution for high-temperature and high-pressure conditions.
Material Properties of Inconel 600 (UNS N06600)
Inconel 600 Hex Head Bolt features high chromium content (14-17%) and a nickel matrix structure, ensuring exceptional stability in high-temperature oxidative environments. The dense **Cr₂O₃ oxide layer** formed on the surface effectively prevents further oxidation, maintaining superior corrosion resistance in air, steam, and harsh sulfur- or carbon-containing atmospheres.
Inconel 600 Hex Head Bolt features high chromium content (14-17%) and a nickel matrix structure, ensuring exceptional stability in high-temperature oxidative environments. The dense **Cr₂O₃ oxide layer** formed on the surface effectively prevents further oxidation, maintaining superior corrosion resistance in air, steam, and harsh sulfur- or carbon-containing atmospheres.
(1) Oxidation Behavior in Air (≤1100℃)
In air environments, Inconel 600 Hex Head Bolt exhibits distinct oxidation characteristics across temperature ranges:
- 500-800℃: A Cr₂O₃-dominated oxide layer forms, accompanied by minor NiO and NiCr₂O₄ spinel structures, with an extremely low oxidation rate (≤0.02 mm/year).
In air environments, Inconel 600 Hex Head Bolt exhibits distinct oxidation characteristics across temperature ranges:
- 500-800℃: A Cr₂O₃-dominated oxide layer forms, accompanied by minor NiO and NiCr₂O₄ spinel structures, with an extremely low oxidation rate (≤0.02 mm/year).
- 800-1000℃: The Cr₂O₃ layer becomes denser, with oxidation rates stabilizing at 0.05-0.10 mm/year. After 1000 hours of exposure, oxide thickness remains only 5-30 μm.
- 1100℃: Effective protection is maintained, with oxidation rates ≤0.15 mm/year—far superior to 304 stainless steel (≥0.5 mm/year).
Comparison with 304 Stainless Steel:
At temperatures above 800°C, 304 stainless steel forms porous Fe₂O₃/Fe₃O₄ layers prone to spalling, whereas Inconel 600 Hex Head Bolt retains an intact Cr₂O₃ layer without delamination risks.
At temperatures above 800°C, 304 stainless steel forms porous Fe₂O₃/Fe₃O₄ layers prone to spalling, whereas Inconel 600 Hex Head Bolt retains an intact Cr₂O₃ layer without delamination risks.
(2) Performance in High-Temperature Steam (800℃)
In steam-rich environments (e.g., nuclear power plant steam pipelines), Inconel 600 Hex Head Bolt resists oxidation, hydrogen permeation, and oxide hydration. Experimental data under 800°C and 10 MPa steam for 1000 hours show:
- Minimal oxidation weight gain (2-5 mg/cm²), with surfaces remaining smooth and free of powdering/spalling.
- 304 stainless steel, however, suffers from loose Fe₂O₃/Fe₃O₄ layers, with weight gains of 20-30 mg/cm² and visible flaking.
In steam-rich environments (e.g., nuclear power plant steam pipelines), Inconel 600 Hex Head Bolt resists oxidation, hydrogen permeation, and oxide hydration. Experimental data under 800°C and 10 MPa steam for 1000 hours show:
- Minimal oxidation weight gain (2-5 mg/cm²), with surfaces remaining smooth and free of powdering/spalling.
- 304 stainless steel, however, suffers from loose Fe₂O₃/Fe₃O₄ layers, with weight gains of 20-30 mg/cm² and visible flaking.
Failure Mechanism Differences:
- 304 stainless steel cracks due to thermal expansion mismatch in Fe-based oxides, exacerbated by hydrogen-induced cracking (HIC) in steam.
- Inconel 600 Hex Head Bolt’s Cr₂O₃ layer matches the base metal’s thermal expansion coefficient (~9.5×10⁻⁶/℃), ensuring exceptional stability.
- 304 stainless steel cracks due to thermal expansion mismatch in Fe-based oxides, exacerbated by hydrogen-induced cracking (HIC) in steam.
- Inconel 600 Hex Head Bolt’s Cr₂O₃ layer matches the base metal’s thermal expansion coefficient (~9.5×10⁻⁶/℃), ensuring exceptional stability.
(3) Resistance in Sulfur-/Carbon-Bearing Environments
In high-temperature H₂S, CO, or CH₄ atmospheres, Inconel 600 Hex Head Bolt outperforms standard stainless steels:
- Sulfurous gases (1% H₂S, 800℃): Corrosion rates ≤0.05 mm/year with minimal NiS formation, versus rapid FeS-driven corrosion (≥0.5 mm/year) in 310S stainless steel.
In high-temperature H₂S, CO, or CH₄ atmospheres, Inconel 600 Hex Head Bolt outperforms standard stainless steels:
- Sulfurous gases (1% H₂S, 800℃): Corrosion rates ≤0.05 mm/year with minimal NiS formation, versus rapid FeS-driven corrosion (≥0.5 mm/year) in 310S stainless steel.
- Carburizing atmospheres (CH₄, 900℃): No carbon buildup, whereas high-chromium steels (e.g., 310S) may suffer carburization-induced embrittlement.
(4) Industrial Application Validation
Inconel 600 Hex Head Bolt has proven reliability in critical applications:
- Nuclear steam generator bolts (300-350°C, high-pressure water): After 30 years of service, oxide layers measure only 3-5 μm with no intergranular corrosion.
Inconel 600 Hex Head Bolt has proven reliability in critical applications:
- Nuclear steam generator bolts (300-350°C, high-pressure water): After 30 years of service, oxide layers measure only 3-5 μm with no intergranular corrosion.
- Petrochemical cracker furnace bolts (800°C, sulfurous gases): Oxidation rates remain stable at 0.03 mm/year after 5 years, with no stress corrosion cracking.
Key Advantages
1. Dense and stable Cr₂O₃ layer (effective up to 1100°C).
2. Superior steam corrosion resistance (critical for nuclear/boiler applications).
3. Immunity to sulfur/carbon attack (outperforms stainless steels in harsh conditions).
1. Dense and stable Cr₂O₃ layer (effective up to 1100°C).
2. Superior steam corrosion resistance (critical for nuclear/boiler applications).
3. Immunity to sulfur/carbon attack (outperforms stainless steels in harsh conditions).
Whether in extreme heat, pressure, or corrosive environments, Inconel 600 Hex Head Bolt delivers long-term, dependable fastening performance, making it the ideal choice for premium industrial applications.
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