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SS 304 Eye Bolt
QS Fastener: SS 304 Eye Bolt
Name: SS 304 Eye Bolt
Standard: ASTM
Material: A193 B8
Size: 1/2 to 4 inch
Thread: 4-1/2 UNC
Length: 30 to 1000 mm
Grade: 8.8
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASTM
Material: A193 B8
Size: 1/2 to 4 inch
Thread: 4-1/2 UNC
Length: 30 to 1000 mm
Grade: 8.8
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
The SS 304 Eye Bolt (ASTM A193 B8) is an industry benchmark product, crafted from premium 304 stainless steel (containing 18% chromium and 8% nickel). It is available in sizes ranging from 1/2"to 4", with lengths of 30-1000 mm, and boasts a high strength grade of 8.8, conforming to the American standard 4-1/2 UNC thread specification. Manufactured through a seamless forging process, it eliminates weld-related risks, and undergoes acid pickling and passivation treatments for enhanced corrosion and high-temperature resistance (up to 800°C). Ideal for heavy-duty lifting and securing in oil pipelines, heavy machinery, chemical equipment, and building steel structures, the SS 304 Eye Bolt is a safe and reliable solution that meets the demands of harsh industrial environments. With its exceptional performance, the SS 304 Eye Bolt is the ideal choice for heavy-duty applications, particularly in scenarios requiring high strength and corrosion resistance.
The surface treatment process of 304 stainless steel fasteners not only determines the product’s aesthetics but also directly impacts its corrosion resistance, wear resistance, and service life. The surface treatment of the SS 304 Eye Bolt has been rigorously optimized to ensure superior performance in various environments.
I. Acid Pickling
Acid pickling is a core process for removing the oxide layer, welding residues, and contaminants from the stainless steel surface, restoring the metal’s original appearance and providing a clean base for subsequent treatments.
Acid pickling is a core process for removing the oxide layer, welding residues, and contaminants from the stainless steel surface, restoring the metal’s original appearance and providing a clean base for subsequent treatments.
1. Surface Cleaning: Use neutral detergents and warm water to remove oil and dust, avoiding high temperatures that may cause deformation of the SS 304 Eye Bolt.
2. Pickling Solution Preparation: A mixed solution of nitric acid (10%) and hydrofluoric acid (2%) is commonly used, with concentrations adjusted based on contamination levels.
3. Immersion/Spraying: The SS 304 Eye Bolt is immersed in the pickling tank or sprayed, with the process lasting 10-30 minutes to thoroughly remove the oxide layer.
4. Neutralization and Rinsing: After pickling, rinse immediately with water, followed by neutralization with an alkaline solution (e.g., sodium hydroxide) to prevent residual acid corrosion.
Innovative Application: Xinhui Pickling and Passivation Agent combines pickling and passivation in one step, using nitric or phosphoric acid passivation solutions to form a dense oxide layer (Cr₂O₃) on the SS 304 Eye Bolt surface, significantly enhancing its corrosion resistance.
II. Polishing Process
Classification and Technical Points
1. Mechanical Polishing
Rough and Fine Grinding: Use 60-80 grit sandpaper to remove surface imperfections, followed by 120-240 grit sandpaper for finer finishing, suitable for standard fasteners.
Classification and Technical Points
1. Mechanical Polishing
Rough and Fine Grinding: Use 60-80 grit sandpaper to remove surface imperfections, followed by 120-240 grit sandpaper for finer finishing, suitable for standard fasteners.
Limitations: May leave minor scratches, requiring chemical or electrolytic polishing to enhance the surface finish of the SS 304 Eye Bolt.
2. Electrolytic Polishing
Process Principle: Using the SS 304 Eye Bolt as the anode, microscopic protrusions are dissolved through electrochemical reactions in the electrolyte to achieve a mirror-like finish.
Process Principle: Using the SS 304 Eye Bolt as the anode, microscopic protrusions are dissolved through electrochemical reactions in the electrolyte to achieve a mirror-like finish.
Advantages: Improves corrosion resistance, ideal for medical and food-grade fasteners.
3. Chemical Polishing
Barrel Tumbling: Batch processing of the SS 304 Eye Bolt in vibratory or rotary tumblers, suitable for internal threads and low-precision external thread products.
Barrel Tumbling: Batch processing of the SS 304 Eye Bolt in vibratory or rotary tumblers, suitable for internal threads and low-precision external thread products.
III. Passivation Treatment
Function and Implementation
Passivation is a critical step to strengthen the oxide layer on stainless steel surfaces through chemical reagents, significantly extending the corrosion-resistant lifespan of the SS 304 Eye Bolt.
1. Passivation Solution Selection: Nitric or phosphoric acid-based solutions (e.g., Xinhui XH-S2109), compliant with RoHS standards.
Function and Implementation
Passivation is a critical step to strengthen the oxide layer on stainless steel surfaces through chemical reagents, significantly extending the corrosion-resistant lifespan of the SS 304 Eye Bolt.
1. Passivation Solution Selection: Nitric or phosphoric acid-based solutions (e.g., Xinhui XH-S2109), compliant with RoHS standards.
2. Operation Process: Immersion or spraying followed by thorough rinsing to ensure no acidic residues.
3. Effect Verification: Salt spray testing (e.g., ASTM B117) to evaluate the protective performance of the passivation layer. After passivation, the SS 304 Eye Bolt exhibits significantly improved corrosion resistance, making it suitable for high-corrosion environments such as marine applications.
IV. Special Scenario Treatments
1. Post-Welding Treatment
Slag Removal: Use wire brushes or angle grinders to remove spatter from the SS 304 Eye Bolt, preventing localized corrosion.
Composite Treatment: Grinding and polishing → acid pickling → secondary passivation to restore protective performance in welded areas.
1. Post-Welding Treatment
Slag Removal: Use wire brushes or angle grinders to remove spatter from the SS 304 Eye Bolt, preventing localized corrosion.
Composite Treatment: Grinding and polishing → acid pickling → secondary passivation to restore protective performance in welded areas.
2. Sandblasting and Brushing
Sandblasting: Using alumina or glass beads to create a uniform matte texture on the SS 304 Eye Bolt surface, enhancing aesthetics.
Sandblasting: Using alumina or glass beads to create a uniform matte texture on the SS 304 Eye Bolt surface, enhancing aesthetics.
Brushing: Directional grinding to produce parallel lines, commonly used in high-end hardware.
3. Electroplating and Spraying
Nickel/Chromium Plating: Enhances the wear resistance of the SS 304 Eye Bolt, but attention must be paid to potential galvanic corrosion due to differences in electrode potential between the coating and base material.
Nickel/Chromium Plating: Enhances the wear resistance of the SS 304 Eye Bolt, but attention must be paid to potential galvanic corrosion due to differences in electrode potential between the coating and base material.
Powder Coating: Epoxy or ceramic coatings offer diverse color options, suitable for outdoor construction fasteners.
V. Quality Control and Selection Recommendations
1. Testing Standards
Salt Spray Test: The SS 304 Eye Bolt must pass at least 96 hours of neutral salt spray testing after passivation.
1. Testing Standards
Salt Spray Test: The SS 304 Eye Bolt must pass at least 96 hours of neutral salt spray testing after passivation.
Hardness Testing: Surface hardness can increase by 20%-30% (Brinell hardness) after electrolytic polishing.
2. Process Compatibility
Food-Grade Applications: Prioritize electrolytic polishing combined with passivation to avoid toxic residues from chemical polishing.
Food-Grade Applications: Prioritize electrolytic polishing combined with passivation to avoid toxic residues from chemical polishing.
Marine Environments: Recommend sandblasting + zinc-nickel alloy plating for balanced corrosion resistance and wear resistance of the SS 304 Eye Bolt.
VI. Application Scenarios and Advantages
1. Oil Pipelines: In oil pipeline applications, the corrosion resistance and high strength of the SS 304 Eye Bolt ensure the safety and stability of the pipeline system.
1. Oil Pipelines: In oil pipeline applications, the corrosion resistance and high strength of the SS 304 Eye Bolt ensure the safety and stability of the pipeline system.
2. Heavy Machinery: In the lifting and securing of heavy machinery, the grade A high strength and seamless forging process of the SS 304 Eye Bolt ensure stable equipment operation.
3. Chemical Equipment: In chemical equipment, the high-temperature and corrosion-resistant properties of the SS 304 Eye Bolt make it an ideal choice for long-term use in harsh environments.
4. Building Steel Structures: In building steel structures, the heavy-duty lifting and securing capabilities of the SS 304 Eye Bolt provide safety assurance for the construction.
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