High-strength fasteners adopt an integrated manufacturing process: quenching & tempering base treatment plus nitriding surface strengthening. Low-temperature nitriding forms a dense white nitrided layer on thread surfaces with minimal heat treatment distortion, fully securing dimensional precision of threads.

Metallographic testing acts as a core quality control measure across the entire fastener production workflow. It enables accurate measurement of nitrided case depth, verification of intact compound layers, and detection of heat treatment defects including porosity and denitrification.

Process parameters can be optimized via metallographic microstructure analysis, drastically improving the wear resistance and anti-seizing performance of bolts. This solution fits working conditions such as automotive chassis and general construction machinery, ensuring long-term stable service of standard high-strength fasteners.

Below is the production workflow of nitrided fasteners & metallographic micrograph showcase:

1️⃣ Rough Grinding: MET-SP P400

2️⃣ Medium Grinding: MET-SP P800

3️⃣ Fine Grinding: MET-SP P2000

4️⃣ Polishing: ET-JP + 3μm PD-WT

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