Composition Features: Contains 18% chromium and 8% nickel, with no molybdenum. It is the "basic model" in the stainless steel family.

Core Advantages: Resistant to general atmospheric corrosion (e.g., dry environments, indoor scenarios), moderately priced, and meets mechanical strength requirements (tensile strength ≥ 515MPa). Suitable for corrosion-free industrial equipment, civilian furniture, door and window hardware, etc.

Precautions: Avoid use in coastal areas (high salt spray) or chemical workshops (acid-alkali environments), as pitting corrosion may occur.

Composition Features: Adds 2%-3% molybdenum to the 304 base, significantly enhancing corrosion resistance.

Core Advantages: Resistant to salt spray and acid-alkali (e.g., seawater, chemical solutions), making it the "standard choice" for marine engineering, shipbuilding, and food processing equipment. It also meets the hygiene requirements of medical equipment (easy to clean, no heavy metal leaching).

Applicable Scenarios: Coastal building curtain walls, aquaculture equipment, pharmaceutical production lines, seawater desalination plants, etc.

Composition Features: Reduces carbon content (≤ 0.03%) based on 304, minimizing the risk of intergranular corrosion during welding.

Core Advantages: Suitable for scenarios requiring welding (e.g., large-scale steel structure connections). It maintains good corrosion resistance after welding and prevents cracks at weld joints.

Applicable Scenarios: Bridge steel structures, large pressure vessels, welded mechanical frames.

Outdoor Curtain Walls: 316 stainless steel bolts connect glass and metal frames, resisting rain and UV erosion to avoid curtain wall falling risks caused by rusting of traditional carbon steel bolts.

Underground Utility Corridors: 304L stainless steel fasteners are used for pipeline connections, withstanding underground humid environments and reducing pipeline leakage hazards.

Machine Tools: High-strength 304 stainless steel screws fix core components to prevent vibration-induced loosening during high-speed equipment operation.

Automotive Manufacturing: In the battery compartments of new energy vehicles, 316 stainless steel nuts are used for electrode connections, resisting electrolyte corrosion and ensuring battery safety.

Medical Equipment: Surgical instruments and disinfection equipment adopt 316 stainless steel fasteners, which are burr-free, easy to clean, and comply with GMP hygiene standards to prevent bacterial growth.

Food Processing: 304 stainless steel bolts connect conveyor belts in beverage production lines, withstanding high-temperature cleaning without contaminating food.

Offshore Platforms: 316 stainless steel fasteners are used for guardrails and equipment bases, resisting seawater salt spray corrosion and ensuring long-term load-bearing capacity.

Chemical Storage Tanks: 316L stainless steel bolts connect tank interfaces, resisting acid-alkali solution erosion and preventing medium leakage.

Dry Indoor Areas (e.g., furniture, shelves): Choose 304 stainless steel fasteners for the best cost-effectiveness.

Humid/Outdoor Areas (e.g., balcony guardrails, outdoor equipment): Choose 304 or 316 (316 is preferred for coastal areas).

Acid-Alkali/High-Salt Areas (e.g., chemical workshops, seawater equipment): Must choose 316 or 316L to avoid corrosion failure.

Light Loads (e.g., decorative parts, small equipment): Choose standard strength (e.g., Grade A2-70, tensile strength ≥ 700MPa).

Medium-to-Heavy Loads (e.g., steel structures, core components of mechanical equipment): Choose high strength (e.g., Grade A4-80, tensile strength ≥ 800MPa). Meanwhile, confirm that the bolt diameter and length match the hole size (reserve a reasonable installation gap).

Removable Connections (e.g., equipment maintenance parts): Choose bolt-nut combinations for easy repeated disassembly.

Non-Removable Connections (e.g., fixed decorative panels): Choose self-tapping screws or riveted screws for stable installation.

Thin-Walled Component Connections (e.g., metal sheets): Choose countersunk screws to avoid protrusions and scratches.

Vibration Environments (e.g., motors, water pumps): Choose fasteners with anti-loosening structures (e.g., with washers, lock nuts) to prevent loosening.

Daily Cleaning: Wipe with a soft cloth dipped in clean water to remove surface dust and oil.

Cleaning in Special Environments (e.g., coastal areas, chemical zones): Regularly clean with neutral detergents (e.g., soapy water), then rinse with clean water to avoid residual salt, acids, or alkalis (residues accelerate corrosion).

Prohibited Cleaners: Strong acids and alkalis (e.g., hydrochloric acid, strong alkaline detergents), which damage the passive film on the stainless steel surface and cause rust.

During Installation: Tighten to the standard torque (refer to the fastener torque table—over-loosening causes loosening, over-tightening causes breakage).

Vibration-Prone Parts: Inspect regularly (e.g., every 3 months). Tighten promptly if loosening is found, or replace with anti-loosening fasteners.

Long-Term Idle Equipment: If equipment is out of service for a long time, apply a small amount of anti-rust oil to the fastener surface (food-grade anti-rust oil for food/medical fields) to avoid "confined rust" in humid environments.