The stainless steel screw industry has recently made significant breakthroughs in key technological fields

1. Innovation in surface treatment technology

1. Rotary vibration linkage passivation device

The "Stainless Steel Fastener Surface Passivation Treatment Device" (patent CN120425331A) developed by Bozex Fastener Co.,Limited eliminates the accumulation blind spots caused by traditional soaking through the design of linked rotation and vibration. With only a single motor drive, it can achieve uniform contact of the passivation solution for the screws in the multi-layer hollow tray, improve the passivation efficiency and quality, and extend the product life.

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### ⚙️ II. Material and process strengthening

1. Strengthening process of austenitic stainless steel bolts

Runzhida Petrochemical Equipment has proposed a new strengthening process (Patent CN120330433A), which combines vacuum melting → solution treatment (1000-1100℃) → medium-temperature rolling (300-850℃) → short-term surface solution treatment. This significantly enhances the mechanical strength and corrosion resistance of large-diameter bolts, making it suitable for high-end petrochemical equipment.

2. Application of High Corrosion-resistant Alloy Materials

- ** Japanese Synegic Company ** has launched the "TryLead Stainless Steel" fastener series, which adopts a special alloy formula to maintain excellent anti-rust and anti-oxidation performance in extreme environments such as Marine and chemical industries. Technical documentation supports customized selection.

3. Development of duplex stainless Steel

Jiangsu Huajie Company's intelligent factory focuses on the production of high-end screws made of 2205 duplex stainless steel and alloy steel, which balance strength and corrosion resistance, and is targeted at high-end fields such as nuclear power and ships.

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