Carbon Steel Nuts/Stainless Steel Flange Nuts Manufacturers

Carbon Steel Nuts/Stainless Steel Flange Nuts Industry Knowledge Extension

How to correctly choose carbon steel or stainless steel flange nuts? Analysis of key indicators of corrosion resistance and strength

1. Overview of core selection factors

Priority of material properties
Carbon steel nuts: high strength, low cost, but easy to rust (surface treatment required).
Stainless steel nuts (such as 304/316): strong corrosion resistance, but slightly lower strength (avoid overload scenarios).

Application environment requirements
Wet, acidic and alkaline environment (chemical/marine) → stainless steel is preferred.
Dry high-load scenario (construction/machinery) → carbon steel + surface treatment is more economical.

2. Key indicators of corrosion resistance

Stainless steel grade comparison
304 stainless steel: general type, resistant to weak acids and alkalis, not resistant to chloride ions (such as seawater).
316 stainless steel: contains molybdenum (Mo), resistant to chlorine corrosion, suitable for marine/chemical industry.

Carbon steel surface treatment process
Hot-dip galvanizing (excellent corrosion resistance), electroplating (low cost), Dacromet (environmentally friendly coating).

3. Considerations of strength and mechanical properties

Tensile strength and hardness
Carbon steel nuts (such as Grade 8.8) are usually stronger than stainless steel (such as A2-70).
For stainless steel flange nuts, attention should be paid to cold working hardening (such as A4-80) to improve strength.

Thread fit and preload
Stainless steel threads have a low friction coefficient and need to be matched with anti-loosening washers or anaerobic adhesives.

4. Recommendations for industry application scenarios

5. Common selection errors and avoidance

Misunderstanding 1: Blindly choosing stainless steel and ignoring strength → High vibration scenarios may cause thread slippage.
Misunderstanding 2: Carbon steel is used in humid environments without protection → Short-term corrosion causes structural safety hazards.