SS 316 Eye Bolt

QS Fastener: SS 316 Eye Bolt

Name: SS 316 Eye Bolt
Standard: ASTM
Material: A193 B8M
Size: 1/2 to 4 inch
Total Length: 30 to 1000mm
Thread: UNC
Grade: A
Application: Oil Pipeline, Machinery, Chemical Industry, Building

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The SS 316 Eye Bolt is made from high-quality A193 B8M stainless steel, compliant with ASTM standards, and features excellent corrosion resistance and high strength (Grade A). Available in a wide range of sizes, from 1/2 to 4 inches, with total lengths ranging from 30 to 1000 mm and UNC threads, the SS 316 Eye Bolt is widely used in demanding environments such as oil pipelines, mechanical equipment, chemical processing, and construction, making it a reliable and durable fastener in industrial applications.

Corrosion Resistance of the SS 316 Eye Bolt
The SS 316 Eye Bolt utilizes ASME SA193 B8M material, and its exceptional corrosion resistance is attributed to the high content of chromium (Cr), nickel (Ni), and molybdenum (Mo) in its composition. Below is a detailed analysis based on professional data:

Material Composition and Corrosion Resistance Mechanism
Chromium (Cr): Content ranges from 16% to 18%. It forms a dense chromium oxide (Cr₂O₃) protective layer, effectively isolating the base material from corrosive media and enhancing oxidation and corrosion resistance.

Nickel (Ni): Content ranges from 10% to 14%. It improves the material's stability in reducing acid environments and enhances resistance to stress corrosion cracking.

Molybdenum (Mo): Content ranges from 2% to 3%. It significantly improves resistance to chloride environments, effectively preventing pitting and crevice corrosion, making it particularly suitable for chlorine-containing media or seawater environments.

Corrosion Resistance Data
1. Oxidizing Acid Environments:
In 20% nitric acid (HNO₃), the corrosion rate is below 0.1 mm/year.
In 50% sulfuric acid (H₂SO₄), the corrosion rate is below 0.5 mm/year (at room temperature).

2. Chloride Environments:
In a 3.5% sodium chloride (NaCl) solution (simulating seawater), the pitting resistance equivalent number (PREN) is ≥25, significantly higher than that of ordinary stainless steels (e.g., 304 stainless steel has a PREN of 19).

In chloride environments at 60°C, its resistance to crevice corrosion is notably superior to 316L stainless steel.

3. High-Temperature Steam Environments:
In 300°C high-temperature steam, the corrosion rate is below 0.01 mm/year.
At 500°C, it maintains a stable oxide layer, demonstrating excellent high-temperature oxidation resistance.

4. Stress Corrosion Cracking (SCC):
In a boiling 42% magnesium chloride (MgCl₂) solution, its resistance to stress corrosion cracking exceeds 1000 hours (far surpassing 304 stainless steel's 200 hours).

Industry Applications and Case Studies
Chemical Industry: The SS 316 Eye Bolt is used in acid treatment equipment, reactors, and pipeline systems, withstanding highly corrosive media such as sulfuric acid and nitric acid.

Oil and Gas Industry: It is employed in offshore platforms, oil pipelines, and valves, adapting to high-chloride ion environments.

Nuclear Power Industry: It is used in critical equipment such as nuclear reactor pressure vessels and steam generators, ensuring long-term stable operation.

Seawater Desalination: It is applied in high-pressure pumps and pipeline systems, resisting corrosion from high-salinity seawater.

The SS 316 Eye Bolt, with its outstanding corrosion resistance, excels in oxidizing acids, chloride environments, and high-temperature steam. Its material composition and performance data demonstrate that it is an ideal choice for ensuring the safe operation of equipment in demanding environments, particularly in industries such as chemical processing, oil and gas, and nuclear power, where material performance is critical.

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