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316SS Hex Head Cap Screw
QS Fastener: 316SS Hex Head Cap Screw
Name: 316SS Hex Head Cap Screw
Material: ASTM A193 B8M Class 2
Standard: ANSI B18.2.1
Thread: Thread 7 UN Class 2A
Size: 1-1/8 Inch
Length: 85mm
Usage : For High Pressure Valve Installation
Material: ASTM A193 B8M Class 2
Standard: ANSI B18.2.1
Thread: Thread 7 UN Class 2A
Size: 1-1/8 Inch
Length: 85mm
Usage : For High Pressure Valve Installation
Quantity
316SS Hex Head Cap Screw is forged from ASTM A193 B8M Class 2 grade 316 stainless steel, fully compliant with ANSI B18.2.1 standards. Available in common sizes such as 1-1/8 inch and customizable to customer requirements. With pickling passivation surface treatment and intergranular corrosion testing, 316SS Hex Head Cap Screw is the ideal choice for leak-proof connections in critical applications like LNG receiving stations and chemical pump valves.
316SS Hex Head Cap Screw – Special Environmental Adaptability
1. Marine Environment: Exceptional Seawater Corrosion Resistance
316SS Hex Head Cap Screw demonstrates superior corrosion resistance in marine engineering, enduring harsh conditions such as high salinity, humidity, and wave impact. Key technical advantages include:
- Alloy Composition Optimization: Molybdenum (Mo) and chromium (Cr) form a dense passive film (e.g., Cr₂O₃), effectively blocking chloride ion (Cl⁻) penetration and preventing pitting and crevice corrosion.
1. Marine Environment: Exceptional Seawater Corrosion Resistance
316SS Hex Head Cap Screw demonstrates superior corrosion resistance in marine engineering, enduring harsh conditions such as high salinity, humidity, and wave impact. Key technical advantages include:
- Alloy Composition Optimization: Molybdenum (Mo) and chromium (Cr) form a dense passive film (e.g., Cr₂O₃), effectively blocking chloride ion (Cl⁻) penetration and preventing pitting and crevice corrosion.
- Enhanced Protection Mechanism: Can be combined with sacrificial anode (e.g., zinc coating) or cathodic protection for double-layer defense in ship hulls, offshore platform brackets, etc.
- Practical Application: Suitable for desalination pipelines, propeller shafts, mooring chains, etc., with 3-5 times longer service life compared to ordinary stainless steel.
Case Study: A deep-sea drilling platform using 316SS Hex Head Cap Screw showed no stress corrosion cracking (SCC) after 5 years of continuous service in H₂S-contaminated seawater (50 ppm).
2. Chemical Industry: Resistance to Diverse Chemical Media
316SS Hex Head Cap Screw performs exceptionally in chemical equipment, particularly in corrosive environments with strong acids and organic solvents:
- Sulfuric Acid (≤10%): High silicon content (≥2%) forms a silicate protective layer, effectively reducing intergranular corrosion in dilute sulfuric acid.
316SS Hex Head Cap Screw performs exceptionally in chemical equipment, particularly in corrosive environments with strong acids and organic solvents:
- Sulfuric Acid (≤10%): High silicon content (≥2%) forms a silicate protective layer, effectively reducing intergranular corrosion in dilute sulfuric acid.
- Phosphoric Acid (≤85%): Synergistic effect of molybdenum (Mo≥3%) and nickel (Ni) creates a stable phosphomolybdate film in high-temperature concentrated phosphoric acid.
- Acetic Acid (with Cl⁻ impurities): Austenitic structure excels in boiling conditions, with outstanding resistance to chloride-induced pitting.
Note: 316SS Hex Head Cap Screw is not recommended for reducing acids (e.g., hydrochloric acid) or fluoride-containing media (HF).
3. High-Temperature Environment: Balancing Short-Term Limits & Long-Term Stability
316SS Hex Head Cap Screw delivers reliable performance in extreme-temperature applications:
- Short-Term High-Temperature Resistance (≤800°C): Suitable for fire valves, engine exhaust components, and other sudden high-temperature scenarios.
316SS Hex Head Cap Screw delivers reliable performance in extreme-temperature applications:
- Short-Term High-Temperature Resistance (≤800°C): Suitable for fire valves, engine exhaust components, and other sudden high-temperature scenarios.
- Long-Term Use (≤450°C): Strict control of ferrite-forming elements prevents 475°C embrittlement and σ-phase precipitation.
- Thermal Cycle Compatibility: Matches the thermal expansion coefficient of common structural steels, minimizing weld-induced stress cracking.
Comparative Data: In 450°C steam environments, 316SS Hex Head Cap Screw exhibits 40% lower oxidation rate than 304 stainless steel.
316SS Hex Head Cap Screw – Comprehensive Application Guidelines
For optimal performance in different conditions, 316SS Hex Head Cap Screw should be paired with appropriate processes:
- Marine Applications: Recommend electropolishing (EP) or shot peening to minimize surface defects.
For optimal performance in different conditions, 316SS Hex Head Cap Screw should be paired with appropriate processes:
- Marine Applications: Recommend electropolishing (EP) or shot peening to minimize surface defects.
- Chemical Equipment: Post-weld solution annealing (1050°C rapid cooling) restores corrosion resistance.
- High-Temperature Components: Avoid prolonged exposure to 500-800°C to prevent σ-phase embrittlement.
316SS Hex Head Cap Screw, with its unparalleled multi-environment adaptability, remains the preferred fastener for critical applications in petroleum, chemical, and marine engineering industries.
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